cdt/cdt_6_0_x/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CProjectDescriptionManager.java
changeset 37 c2bce6dd59e7
child 42 8f5c938a2b97
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cdt/cdt_6_0_x/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CProjectDescriptionManager.java	Wed Jul 29 14:30:25 2009 -0500
@@ -0,0 +1,2678 @@
+/*******************************************************************************
+ * Copyright (c) 2007, 2009 Intel Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ * Intel Corporation - Initial API and implementation
+ * Markus Schorn (Wind River Systems)
+ * IBM Corporation
+ * James Blackburn (Broadcom Corp.)
+ * Alex Blewitt Bug 132511 - nature order not preserved
+ *******************************************************************************/
+package org.eclipse.cdt.internal.core.settings.model;
+
+import java.io.ByteArrayOutputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.UnsupportedEncodingException;
+import java.net.URI;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.LinkedHashMap;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.CopyOnWriteArraySet;
+
+import javax.xml.parsers.DocumentBuilder;
+import javax.xml.parsers.DocumentBuilderFactory;
+import javax.xml.parsers.FactoryConfigurationError;
+import javax.xml.parsers.ParserConfigurationException;
+import javax.xml.transform.OutputKeys;
+import javax.xml.transform.Transformer;
+import javax.xml.transform.TransformerConfigurationException;
+import javax.xml.transform.TransformerException;
+import javax.xml.transform.TransformerFactory;
+import javax.xml.transform.dom.DOMSource;
+import javax.xml.transform.stream.StreamResult;
+
+import org.eclipse.cdt.core.CCorePlugin;
+import org.eclipse.cdt.core.model.CModelException;
+import org.eclipse.cdt.core.model.ICElement;
+import org.eclipse.cdt.core.model.ICElementDelta;
+import org.eclipse.cdt.core.model.ICProject;
+import org.eclipse.cdt.core.settings.model.CExternalSetting;
+import org.eclipse.cdt.core.settings.model.CProjectDescriptionEvent;
+import org.eclipse.cdt.core.settings.model.ICConfigurationDescription;
+import org.eclipse.cdt.core.settings.model.ICDescriptionDelta;
+import org.eclipse.cdt.core.settings.model.ICFileDescription;
+import org.eclipse.cdt.core.settings.model.ICFolderDescription;
+import org.eclipse.cdt.core.settings.model.ICLanguageSetting;
+import org.eclipse.cdt.core.settings.model.ICLanguageSettingEntry;
+import org.eclipse.cdt.core.settings.model.ICProjectDescription;
+import org.eclipse.cdt.core.settings.model.ICProjectDescriptionListener;
+import org.eclipse.cdt.core.settings.model.ICProjectDescriptionManager;
+import org.eclipse.cdt.core.settings.model.ICProjectDescriptionWorkspacePreferences;
+import org.eclipse.cdt.core.settings.model.ICResourceDescription;
+import org.eclipse.cdt.core.settings.model.ICSettingBase;
+import org.eclipse.cdt.core.settings.model.ICSettingEntry;
+import org.eclipse.cdt.core.settings.model.ICSettingObject;
+import org.eclipse.cdt.core.settings.model.ICSettingsStorage;
+import org.eclipse.cdt.core.settings.model.ICSourceEntry;
+import org.eclipse.cdt.core.settings.model.ICStorageElement;
+import org.eclipse.cdt.core.settings.model.ICTargetPlatformSetting;
+import org.eclipse.cdt.core.settings.model.extension.CConfigurationData;
+import org.eclipse.cdt.core.settings.model.extension.CConfigurationDataProvider;
+import org.eclipse.cdt.core.settings.model.extension.CFileData;
+import org.eclipse.cdt.core.settings.model.extension.CFolderData;
+import org.eclipse.cdt.core.settings.model.extension.CLanguageData;
+import org.eclipse.cdt.core.settings.model.extension.CResourceData;
+import org.eclipse.cdt.core.settings.model.extension.ICProjectConverter;
+import org.eclipse.cdt.core.settings.model.extension.impl.CDataFactory;
+import org.eclipse.cdt.core.settings.model.util.CDataUtil;
+import org.eclipse.cdt.core.settings.model.util.CSettingEntryFactory;
+import org.eclipse.cdt.core.settings.model.util.KindBasedStore;
+import org.eclipse.cdt.core.settings.model.util.ListComparator;
+import org.eclipse.cdt.core.settings.model.util.PathSettingsContainer;
+import org.eclipse.cdt.core.settings.model.util.PatternNameMap;
+import org.eclipse.cdt.internal.core.CConfigBasedDescriptorManager;
+import org.eclipse.cdt.internal.core.model.CElementDelta;
+import org.eclipse.cdt.internal.core.settings.model.CExternalSettinsDeltaCalculator.ExtSettingsDelta;
+import org.eclipse.cdt.internal.core.settings.model.xml.InternalXmlStorageElement;
+import org.eclipse.cdt.internal.core.settings.model.xml.XmlStorage;
+import org.eclipse.core.filesystem.EFS;
+import org.eclipse.core.filesystem.IFileStore;
+import org.eclipse.core.resources.IProject;
+import org.eclipse.core.resources.IProjectDescription;
+import org.eclipse.core.resources.IResource;
+import org.eclipse.core.resources.IResourceChangeEvent;
+import org.eclipse.core.resources.ISavedState;
+import org.eclipse.core.resources.IWorkspace;
+import org.eclipse.core.resources.IWorkspaceRoot;
+import org.eclipse.core.resources.IWorkspaceRunnable;
+import org.eclipse.core.resources.ResourcesPlugin;
+import org.eclipse.core.runtime.CoreException;
+import org.eclipse.core.runtime.IExtension;
+import org.eclipse.core.runtime.IExtensionPoint;
+import org.eclipse.core.runtime.IPath;
+import org.eclipse.core.runtime.IProgressMonitor;
+import org.eclipse.core.runtime.IStatus;
+import org.eclipse.core.runtime.NullProgressMonitor;
+import org.eclipse.core.runtime.Platform;
+import org.eclipse.core.runtime.QualifiedName;
+import org.eclipse.core.runtime.Status;
+import org.eclipse.core.runtime.SubProgressMonitor;
+import org.eclipse.core.runtime.content.IContentType;
+import org.eclipse.core.runtime.content.IContentTypeManager;
+import org.eclipse.core.runtime.jobs.IJobManager;
+import org.eclipse.core.runtime.jobs.ISchedulingRule;
+import org.eclipse.core.runtime.jobs.Job;
+import org.osgi.framework.Version;
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+import org.w3c.dom.Node;
+import org.w3c.dom.NodeList;
+import org.w3c.dom.ProcessingInstruction;
+import org.xml.sax.SAXException;
+
+import com.ibm.icu.text.MessageFormat;
+
+/**
+ * The CProjectDescriptionManager is to marshall the loading and storing
+ * of CDT Project Descriptions.
+ *
+ * This class delegates loading and store of the project model to the appropriate
+ * AbstractCProjectDescriptionStorage for the Project Description.  [ Discovered at Project load
+ * time.]
+ *
+ * Users should not synchronize on the singleton instance of this class. It is the job of
+ * the AbstractCProjectDescriptionStorage to ensure thread safe access to the backing store
+ * as described in that interface.
+ *
+ * Previously this class created and persisted
+ * @see ICProjectDescriptionManager
+ */
+public class CProjectDescriptionManager implements ICProjectDescriptionManager {
+	public static final int INTERNAL_GET_IGNORE_CLOSE = 1 << 31 ;
+
+	private static final String VERSION_ELEMENT_NAME = "fileVersion";	//$NON-NLS-1$
+	/** Preference Version 4.0 & 5.0 are equivalent for us. Version was inadvertently bumped
+	 *  when during project description storage work.
+	 *  This is the minimum preference version we support loading.*/
+	public static final Version MIN_DESCRIPTION_VERSION = new Version("4.0"); //$NON-NLS-1$
+	/** Current preference file storage version */
+	public static final Version DESCRIPTION_VERSION = new Version("5.0"); 	//$NON-NLS-1$
+	public final static String MODULE_ID = "org.eclipse.cdt.core.settings";	//$NON-NLS-1$
+	static final String CONFIGURATION = "cconfiguration";	//$NON-NLS-1$
+	private static final ICLanguageSettingEntry[] EMPTY_LANGUAGE_SETTINGS_ENTRIES_ARRAY = new ICLanguageSettingEntry[0];
+	private static final ICElementDelta[] EMPTY_CELEMENT_DELTA = new ICElementDelta[0];
+	private static final ICLanguageSetting[] EMPTY_LANGUAGE_SETTINGS_ARRAY = new ICLanguageSetting[0];
+	private static final String PREFERENCES_STORAGE = "preferences";	//$NON-NLS-1$
+	private static final String PREFERENCE_BUILD_SYSTEM_ELEMENT = "buildSystem";	//$NON-NLS-1$
+	private static final String PREFERENCES_ELEMENT = "preferences";	//$NON-NLS-1$
+	private static final String ID = "id";	//$NON-NLS-1$
+	private static final String PREFERENCE_CFG_ID_PREFIX = "preference.";	//$NON-NLS-1$
+	private static final String PREFERENCE_CFG_NAME = SettingsModelMessages.getString("CProjectDescriptionManager.15"); //$NON-NLS-1$
+	private static final String ROOT_PREFERENCE_ELEMENT = "preferences";	//$NON-NLS-1$
+	private static final String DEFAULT_CFG_ID_PREFIX = CCorePlugin.PLUGIN_ID + ".default.config"; //$NON-NLS-1$
+	private static final String DEFAULT_CFG_NAME = "Configuration"; //$NON-NLS-1$
+
+	private static final QualifiedName SCANNER_INFO_PROVIDER_PROPERTY = new QualifiedName(CCorePlugin.PLUGIN_ID, "scannerInfoProvider"); //$NON-NLS-1$
+
+	static class CompositeWorkspaceRunnable implements IWorkspaceRunnable {
+		private List<IWorkspaceRunnable> fRunnables = new ArrayList<IWorkspaceRunnable>();
+		private String fName;
+		private boolean fStopOnErr;
+
+		CompositeWorkspaceRunnable(String name){
+			if(name == null)
+				name = "";	//$NON-NLS-1$
+			fName = name;
+		}
+
+		public void add(IWorkspaceRunnable runnable){
+			fRunnables.add(runnable);
+		}
+
+		public void run(IProgressMonitor monitor) throws CoreException {
+			try {
+				monitor.beginTask(fName, fRunnables.size());
+
+				for(Iterator<IWorkspaceRunnable> iter = fRunnables.iterator(); iter.hasNext();){
+					IWorkspaceRunnable r = iter.next();
+					IProgressMonitor subMonitor = new SubProgressMonitor(monitor, 1);
+					try {
+						r.run(subMonitor);
+					} catch (CoreException e){
+						if(fStopOnErr)
+							throw e;
+					} catch (RuntimeException e) {
+						if(fStopOnErr)
+							throw e;
+					} finally {
+						subMonitor.done();
+					}
+				}
+			} finally {
+				monitor.done();
+			}
+		}
+
+		public boolean isEmpty(){
+			return fRunnables.isEmpty();
+		}
+	}
+
+	/**
+	 * Container class for ICProjectDescription change listeners
+	 */
+	private static class ListenerDescriptor{
+		final ICProjectDescriptionListener fListener;
+		final int fEventTypes;
+
+		public ListenerDescriptor(ICProjectDescriptionListener listener, int eventTypes) {
+			fListener = listener;
+			fEventTypes = eventTypes;
+		}
+
+		public boolean handlesEvent(int eventType){
+			return (eventType & fEventTypes) != 0;
+		}
+		@Override
+		public int hashCode() {
+			return fListener.hashCode();
+		}
+		@Override
+		public boolean equals(Object obj) {
+			return fListener.equals(obj);
+		}
+	}
+
+	private volatile Map<String, CConfigurationDataProviderDescriptor> fProviderMap;
+	private volatile CProjectConverterDesciptor fConverters[];
+	/** Set of Listeners listening for Project Description Deltas */
+	private Set<ListenerDescriptor> fListeners = new CopyOnWriteArraySet<ListenerDescriptor>();
+	private Map<String, CConfigurationDescriptionCache> fPreferenceMap = new HashMap<String, CConfigurationDescriptionCache>();
+	private CConfigBasedDescriptorManager fDescriptorManager;
+	private ResourceChangeHandler fRcChangeHandler;
+	private CProjectDescriptionWorkspacePreferences fPreferences;
+	private boolean fAllowEmptyCreatingDescription = true; // allowed by default
+
+	private ICDataProxyContainer fPrefUpdater = new ICDataProxyContainer(){
+
+		public void updateChild(CDataProxy child, boolean write) {
+			if(write){
+				try {
+					((CConfigurationDescription)child).doWritable();
+				} catch (CoreException e) {
+					CCorePlugin.log(e);
+				}
+			}
+		}
+
+		public ICSettingObject[] getChildSettings() {
+			return fPreferenceMap.values().toArray(new CConfigurationDescriptionCache[fPreferenceMap.size()]);
+		}
+	};
+
+	/** The CProjectDescriptionManager instance */
+	private static volatile CProjectDescriptionManager fInstance;
+
+	private CProjectDescriptionManager(){}
+
+	public static CProjectDescriptionManager getInstance(){
+		if(fInstance == null)
+			synchronized(CProjectDescriptionManager.class) {
+				if (fInstance == null)
+					fInstance = new CProjectDescriptionManager();
+			}
+		return fInstance;
+	}
+
+	public void projectClosedRemove(IProject project) {
+		CProjectDescriptionStorageManager.getInstance().projectClosedRemove(project);
+	}
+
+	public void projectMove(IProject from, IProject to) {
+		CProjectDescriptionStorageManager.getInstance().projectMove(from, to);
+	}
+
+
+	public Job startup(){
+		if(fRcChangeHandler == null){
+			fRcChangeHandler = new ResourceChangeHandler();
+
+			ResourcesPlugin.getWorkspace().addResourceChangeListener(
+					fRcChangeHandler,
+					IResourceChangeEvent.POST_CHANGE
+					| IResourceChangeEvent.PRE_DELETE
+					| IResourceChangeEvent.PRE_CLOSE
+			/*| IResourceChangeEvent.POST_BUILD*/);
+
+			if(fDescriptorManager == null){
+				fDescriptorManager = CConfigBasedDescriptorManager.getInstance();
+				fDescriptorManager.startup();
+			}
+
+			CExternalSettingsManager.getInstance().startup();
+		}
+		return createPostStartupJob();
+	}
+
+	private Job createPostStartupJob() {
+		IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot();
+		Job rcJob = new Job(SettingsModelMessages.getString("CProjectDescriptionManager.0")){ //$NON-NLS-1$
+			@Override
+			protected IStatus run(IProgressMonitor monitor) {
+				try{
+					startSaveParticipant();
+				} catch (CoreException e){
+					CCorePlugin.log(e);
+					return e.getStatus();
+				}
+				return new Status(
+						IStatus.OK,
+						CCorePlugin.PLUGIN_ID,
+						IStatus.OK,
+						"", //$NON-NLS-1$
+						null);
+			}
+		};
+
+		rcJob.setRule(root);
+		rcJob.setPriority(Job.INTERACTIVE);
+		rcJob.setSystem(true);
+		return rcJob;
+	}
+
+	/*
+	 * This method adds a save participant and resource change listener
+	 * Throws CoreException if the methods fails to add a save participant.
+	 * The resource change listener in not added in this case either.
+	 */
+	private void startSaveParticipant() throws CoreException{
+		// Set up a listener for resource change events
+		ISavedState lastState =
+			ResourcesPlugin.getWorkspace().addSaveParticipant(CCorePlugin.getDefault(), fRcChangeHandler);
+
+		if (lastState != null) {
+			lastState.processResourceChangeEvents(fRcChangeHandler);
+		}
+	}
+
+	public void shutdown(){
+		CExternalSettingsManager.getInstance().shutdown();
+
+		if(fDescriptorManager != null) {
+			fDescriptorManager.shutdown();
+			fDescriptorManager = null;
+		}
+
+		if(fRcChangeHandler != null) {
+			ResourcesPlugin.getWorkspace().removeResourceChangeListener(fRcChangeHandler);
+			fRcChangeHandler = null;
+		}
+
+		CProjectDescriptionStorageManager.getInstance().shutdown();
+	}
+
+	public ICProjectDescription getProjectDescription(IProject project, boolean write) {
+		return getProjectDescription(project, true, write);
+	}
+
+	public ICProjectDescription getProjectDescription(IProject project, boolean load, boolean write) {
+		int flags = load ? 0 : GET_IF_LOADDED;
+		flags |= write ? GET_WRITABLE : 0;
+
+		return getProjectDescription(project, flags);
+	}
+
+	public ICProjectDescription getProjectDescription(IProject project, int flags) {
+		AbstractCProjectDescriptionStorage storage = getProjectDescriptionStorage(project);
+		if (storage != null) {
+			try {
+				return storage.getProjectDescription(flags, new NullProgressMonitor());
+			} catch (CoreException e) {
+				// FIXME Currently the resource change handler ResourceChangeHandler.getProjectDescription(...)
+				// Does this when the project is closed. Don't log an error or the tests will fail
+//				CCorePlugin.log(e);
+			}
+		}
+		return null;
+	}
+
+	/**
+	 * Run the workspace modification in the current thread using the workspace scheduling rule
+	 * Equivalent to: <code>runWspModification(IWorkspaceRunnable, ResourcecPlugin.getWorkspace().getRoot(), IProgressMonitor)</code>
+	 *<br/><br/>
+	 * Note that if the workspace is locked, or the current job / thread doesn't contain the workspace
+	 * scheduling rule, then we schedule a job to run the {@link IWorkspaceRunnable}
+	 *<br/><br/>
+	 * The scheduled job is returned, or null if the operation was run immediately.
+	 *
+	 * @param runnable the IWorkspaceRunnable to run
+	 * @param monitor
+	 * @return scheduled job or null if the operation was run immediately
+	 */
+	public static Job runWspModification(final IWorkspaceRunnable runnable, IProgressMonitor monitor) {
+		return runWspModification(runnable, ResourcesPlugin.getWorkspace().getRoot(), monitor);
+	}
+
+	/**
+	 * Either runs the modification in the current thread (if the workspace is not locked)
+	 * or schedules a runnable to perform the operation
+	 * @param runnable
+	 * @param monitor
+	 * @return scheduled job or null if the operation was run immediately
+	 */
+	public static Job runWspModification(final IWorkspaceRunnable runnable, final ISchedulingRule rule, IProgressMonitor monitor){
+		if(monitor == null)
+			monitor = new NullProgressMonitor();
+
+		// Should the rule be scheduled, or run immediately
+		boolean scheduleRule =  ResourcesPlugin.getWorkspace().isTreeLocked();
+
+		// Check whether current job contains rule 'rule'
+		// If not, we must schedule another job to execute the runnable
+		if (!scheduleRule) {
+			Job currentJob = Job.getJobManager().currentJob();
+			if (currentJob != null && currentJob.getRule() != null && !currentJob.getRule().contains(rule))
+				scheduleRule = true;
+		}
+
+		if(!scheduleRule) {
+			// Run immediately
+			IJobManager mngr = Job.getJobManager();
+			try{
+				mngr.beginRule(rule, monitor);
+				runAtomic(runnable, rule, monitor);
+			} catch (Exception e) {
+				CCorePlugin.log(e);
+			} finally {
+				if(!scheduleRule)
+					monitor.done();
+				mngr.endRule(rule);
+			}
+		} else {
+			// schedule a job for it
+			Job job = new Job(SettingsModelMessages.getString("CProjectDescriptionManager.12")){ //$NON-NLS-1$
+				@Override
+				protected IStatus run(IProgressMonitor monitor) {
+					try {
+						runAtomic(runnable, rule, monitor);
+					} catch (CoreException e) {
+						CCorePlugin.log(e);
+						return e.getStatus();
+					} finally {
+						monitor.done();
+					}
+					return Status.OK_STATUS;
+				}
+			};
+
+			job.setRule(rule);
+			job.setSystem(true);
+			job.schedule();
+			return job;
+		}
+		return null;
+	}
+
+	private static void runAtomic(final IWorkspaceRunnable r, ISchedulingRule rule, IProgressMonitor monitor) throws CoreException{
+		IWorkspace wsp = ResourcesPlugin.getWorkspace();
+		wsp.run(new IWorkspaceRunnable(){
+			public void run(IProgressMonitor monitor) throws CoreException {
+				try {
+					r.run(monitor);
+				} catch (Exception e){
+					CCorePlugin.log(e);
+					throw new CoreException(new Status(IStatus.ERROR, CCorePlugin.PLUGIN_ID, e.getMessage(), e));
+				}
+			}
+		}, rule, IWorkspace.AVOID_UPDATE, monitor);
+	}
+
+	public void updateProjectDescriptions(IProject[] projects, IProgressMonitor monitor) throws CoreException{
+		if(monitor == null)
+			monitor = new NullProgressMonitor();
+
+		try {
+			IWorkspace wsp = ResourcesPlugin.getWorkspace();
+			if(projects == null)
+				projects = wsp.getRoot().getProjects();
+			final ICProjectDescription dess[] = new ICProjectDescription[projects.length];
+			int num = 0;
+			for(int i = 0; i < projects.length; i++){
+				ICProjectDescription des = getProjectDescription(projects[i], false, true);
+				if(des != null)
+					dess[num++] = des;
+			}
+
+			if(num != 0){
+				final int[] fi = new int[1];
+				fi[0] = num;
+				runWspModification(new IWorkspaceRunnable(){
+
+					public void run(IProgressMonitor monitor) throws CoreException {
+						monitor.beginTask(SettingsModelMessages.getString("CProjectDescriptionManager.13"), fi[0]); //$NON-NLS-1$
+
+						for(int i = 0; i < dess.length; i++){
+							ICProjectDescription des = dess[i];
+							if(des == null)
+								break;
+							IProgressMonitor subMonitor = new SubProgressMonitor(monitor, 1);
+							try {
+								setProjectDescription(des.getProject(), des, true, subMonitor);
+							} catch (CoreException e){
+								CCorePlugin.log(e);
+							} finally {
+								subMonitor.done();
+							}
+						}
+					}
+				}, monitor);
+
+			}
+		} finally {
+			monitor.done();
+		}
+
+	}
+
+	public ICProjectConverter getConverter(IProject project, String oldOwnerId, ICProjectDescription des){
+		CProjectConverterDesciptor[] converterDess = getConverterDescriptors();
+		ICProjectConverter converter = null;
+		for(int i = 0; i < converterDess.length; i++){
+			if(converterDess[i].canConvertProject(project, oldOwnerId, des)){
+				try {
+					converter = converterDess[i].getConverter();
+				} catch (CoreException e) {
+				}
+				if(converter != null)
+					break;
+			}
+		}
+		return converter;
+	}
+
+	private CProjectConverterDesciptor[] getConverterDescriptors(){
+		if(fConverters == null){
+			initConverterInfoSynch();
+		}
+		return fConverters;
+	}
+
+	private synchronized void initConverterInfoSynch(){
+		if(fConverters != null)
+			return;
+
+		IExtensionPoint extensionPoint = Platform.getExtensionRegistry().getExtensionPoint(CProjectConverterDesciptor.PROJECT_CONVERTER_EXTPOINT_ID);
+		IExtension exts[] = extensionPoint.getExtensions();
+		CProjectConverterDesciptor[] dess = new CProjectConverterDesciptor[exts.length];
+
+		for(int i = 0; i < exts.length; i++){
+			dess[i] = new CProjectConverterDesciptor(exts[i]);
+		}
+
+		fConverters = dess;
+	}
+
+	public ICProjectDescription createProjectDescription(IProject project, boolean loadIfExists) throws CoreException{
+		return createProjectDescription(project, loadIfExists, false);
+	}
+
+	public ICProjectDescription createProjectDescription(IProject project, boolean loadIfExists, boolean creating) throws CoreException{
+		int flags = ICProjectDescriptionManager.GET_WRITABLE | ICProjectDescriptionManager.GET_CREATE_DESCRIPTION;
+		flags |= loadIfExists ? 0 : ICProjectDescriptionManager.GET_EMPTY_PROJECT_DESCRIPTION;
+		flags |= creating ? ICProjectDescriptionManager.PROJECT_CREATING : 0;
+
+		return getProjectDescription(project, flags);
+	}
+
+	public ScannerInfoProviderProxy getScannerInfoProviderProxy(IProject project){
+		ICProjectDescription des = getProjectDescription(project, false);
+		if(des == null){
+			return new ScannerInfoProviderProxy(project);
+		}
+
+		ScannerInfoProviderProxy provider = (ScannerInfoProviderProxy)des.getSessionProperty(SCANNER_INFO_PROVIDER_PROPERTY);
+		if(provider == null){
+			provider = new ScannerInfoProviderProxy(project);
+			des.setSessionProperty(SCANNER_INFO_PROVIDER_PROPERTY, provider);
+		} else {
+			provider.updateProject(project);
+		}
+
+		return provider;
+	}
+
+	public ICProjectDescription getProjectDescription(IProject project){
+		return getProjectDescription(project, true);
+	}
+
+	/*
+	 * returns true if the project description was modified false - otherwise
+	 */
+	public boolean checkHandleActiveCfgChange(CProjectDescription newDes, ICProjectDescription oldDes, IProjectDescription eDes, IProgressMonitor monitor){
+		if(newDes == null)
+			return false;
+		ICConfigurationDescription newCfg = newDes.getActiveConfiguration();
+		if(newCfg == null)
+			return false;
+
+		ICConfigurationDescription oldCfg = oldDes != null ? oldDes.getActiveConfiguration() : null;
+
+		checkActiveCfgChange(newDes, oldDes);
+		checkSettingCfgChange(newDes, oldDes);
+
+		boolean modified = false;
+
+		try {
+			if(checkBuildSystemChange(eDes, newCfg, oldCfg, monitor))
+				modified = true;
+		} catch (CoreException e) {
+			CCorePlugin.log(e);
+		}
+
+		try {
+			if(checkProjectRefChange(eDes, newCfg, oldCfg, monitor))
+				modified = true;
+		} catch (CoreException e) {
+			CCorePlugin.log(e);
+		}
+
+		return modified;
+	}
+
+//	String loadActiveCfgId(ICProjectDescription des){
+//		try {
+//			return des.getProject().getPersistentProperty(ACTIVE_CFG_PROPERTY);
+//		} catch (CoreException e) {
+//			CCorePlugin.log(e);
+//		}
+//		return null;
+//	}
+
+	private Collection<IProject> projSetFromProjNameSet(Collection<String> projNames){
+		if(projNames.size() == 0)
+			return new HashSet<IProject>(0);
+
+		Set<IProject> set = new HashSet<IProject>();
+		IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot();
+
+		for (String sproj : projNames)
+			set.add(root.getProject(sproj));
+
+		return set;
+	}
+
+	private boolean checkProjectRefChange(IProjectDescription des, ICConfigurationDescription newCfg, ICConfigurationDescription oldCfg, IProgressMonitor monitor) throws CoreException{
+		if(newCfg == null)
+			return false;
+
+		Map<String, String> oldMap = oldCfg != null ? oldCfg.getReferenceInfo() : null;
+		Map<String, String> newMap = newCfg.getReferenceInfo();
+		Collection<IProject> oldProjSet = oldMap != null ? projSetFromProjNameSet(oldMap.keySet()) : new HashSet<IProject>(0);
+		Collection<IProject> newProjSet = newMap != null ? projSetFromProjNameSet(newMap.keySet()) : new HashSet<IProject>(0);
+
+		Set<IProject> tmp = new HashSet<IProject>(newProjSet);
+		newProjSet.removeAll(oldProjSet);
+		oldProjSet.removeAll(tmp);
+		if(oldProjSet.size() != 0 || newProjSet.size() != 0){
+			IProject[] refs = des.getReferencedProjects();
+			Set<IProject> set = new HashSet<IProject>(Arrays.asList(refs));
+			set.removeAll(oldProjSet);
+			set.addAll(newProjSet);
+			des.setReferencedProjects(set.toArray(new IProject[set.size()]));
+			return true;
+		}
+		return false;
+	}
+
+
+//	private void checkBuildSystemChange(IProject project, String newBsId, String oldBsId, IProgressMonitor monitor) throws CoreException{
+//		checkBuildSystemChange(project, null, newBsId, oldBsId, monitor);
+//	}
+
+	private boolean checkActiveCfgChange(CProjectDescription des,
+			ICProjectDescription oldDes
+//			ICConfigurationDescription newCfg,
+//			ICConfigurationDescription oldCfg
+			){
+		ICConfigurationDescription oldCfg = oldDes != null ? oldDes.getActiveConfiguration() : null;
+//		String newId = newCfg.getId();
+		String oldId = oldCfg != null ? oldCfg.getId() : null;
+
+
+		return des.checkPersistActiveCfg(oldId, false);
+	}
+
+	private boolean checkSettingCfgChange(CProjectDescription des,
+			ICProjectDescription oldDes
+//			ICConfigurationDescription newCfg,
+//			ICConfigurationDescription oldCfg
+			){
+		ICConfigurationDescription oldCfg = oldDes != null ? oldDes.getDefaultSettingConfiguration() : null;
+//		String newId = newCfg.getId();
+		String oldId = oldCfg != null ? oldCfg.getId() : null;
+
+
+		return des.checkPersistSettingCfg(oldId, false);
+	}
+
+	private boolean checkBuildSystemChange(IProjectDescription des,
+			ICConfigurationDescription newCfg,
+			ICConfigurationDescription oldCfg,
+			IProgressMonitor monitor) throws CoreException{
+		String newBsId = newCfg != null ? newCfg.getBuildSystemId() : null;
+		String oldBsId = oldCfg != null ? oldCfg.getBuildSystemId() : null;
+
+		CConfigurationDataProviderDescriptor newDr = newBsId != null ? getCfgProviderDescriptor(newBsId) : null;
+		CConfigurationDataProviderDescriptor oldDr = oldBsId != null ? getCfgProviderDescriptor(oldBsId) : null;
+
+		List<String> newNatures, oldNatures, conflictingNatures;
+		newNatures = oldNatures = conflictingNatures = Collections.emptyList();
+		if (oldDr != null)
+			oldNatures = Arrays.asList(oldDr.getNatureIds());
+		if (newDr != null) {
+			newNatures = Arrays.asList(newDr.getNatureIds());
+			conflictingNatures = Arrays.asList(newDr.getConflictingNatureIds());
+		}
+
+		// List of existing natureIds
+		final String[] natureIds = des.getNatureIds();
+
+		// Get the set of items to remove ({oldNatures} - {newNatures}) + conflictingNatures
+		Set<String> toRemove = new HashSet<String>(oldNatures);
+		toRemove.removeAll(newNatures); 		// Don't remove items we're re-adding
+		toRemove.addAll(conflictingNatures);	// Add conflicting natures for removal
+		// Modify an ordered set of the existing natures with the changes
+		final LinkedHashSet<String> cur = new LinkedHashSet<String>(Arrays.asList(natureIds));
+		cur.addAll(newNatures);
+		cur.removeAll(toRemove);
+
+		final String[] newNatureIds = cur.toArray(new String[cur.size()]);
+		if (!Arrays.equals(newNatureIds, natureIds)) {
+			des.setNatureIds(newNatureIds);
+			return true;
+		}
+
+		return false;
+	}
+
+	public void setProjectDescription(IProject project, ICProjectDescription des) throws CoreException {
+		setProjectDescription(project, des, false, null);
+	}
+
+	public void setProjectDescription(IProject project, ICProjectDescription des, boolean force, IProgressMonitor monitor) throws CoreException {
+		int flags = force ? SET_FORCE : 0;
+		setProjectDescription(project, des, flags, monitor);
+	}
+
+	static boolean checkFlags(int flags, int check){
+		return (flags & check) == check;
+	}
+
+	/** ThreadLocal flag to let CDescriptor know whether already in a setProjectDescription */
+	ThreadLocal<Boolean> settingProjectDescription = new ThreadLocal<Boolean>(){@Override protected Boolean initialValue() {return false;}};
+	public void setProjectDescription(IProject project, ICProjectDescription des, int flags, IProgressMonitor monitor) throws CoreException {
+		try {
+			settingProjectDescription.set(true);
+			if(des != null){
+				if (!project.isAccessible())
+					throw ExceptionFactory.createCoreException(MessageFormat.format(CCorePlugin.getResourceString("ProjectDescription.ProjectNotAccessible"), new Object[] {project.getName()})); //$NON-NLS-1$
+
+				if(!des.isValid() && (!fAllowEmptyCreatingDescription || !des.isCdtProjectCreating()))
+					throw ExceptionFactory.createCoreException(SettingsModelMessages.getString("CProjectDescriptionManager.17") + project.getName()); //$NON-NLS-1$
+
+				if(!checkFlags(flags, SET_FORCE) && !des.isModified())
+					return;
+
+				if(((CProjectDescription)des).isLoading()){
+					throw ExceptionFactory.createCoreException("description is being loadded"); //$NON-NLS-1$
+				}
+
+				if(((CProjectDescription)des).isApplying()){
+					throw ExceptionFactory.createCoreException("description is being applied"); //$NON-NLS-1$
+				}
+			}
+			CProjectDescriptionStorageManager.getInstance().setProjectDescription(project, des, flags, monitor);
+		} finally {
+			settingProjectDescription.set(false);
+		}
+	}
+
+	/**
+	 * Indicates that a setProjectDescription is currently in progress to prevent recursive setProjectDescription
+	 * @return boolean
+	 */
+	public boolean isCurrentThreadSetProjectDescription() {
+		return settingProjectDescription.get();
+	}
+
+	private AbstractCProjectDescriptionStorage getProjectDescriptionStorage(IProject project) {
+		return CProjectDescriptionStorageManager.getInstance().getProjectDescriptionStorage(project);
+	}
+
+	/**
+	 * Return an ICSettingsStorage based on the provided ICStorageElement
+	 * in the given IProject
+	 * @param project
+	 * @return ICSettingsStorages
+	 */
+	public ICSettingsStorage getStorageForElement(IProject project, ICStorageElement element) throws CoreException {
+		if (project != null)
+			return getProjectDescriptionStorage(project).getStorageForElement(element);
+		// project is null means it's a preference element, uses XmlStorages
+		return new XmlStorage((InternalXmlStorageElement)element);
+	}
+
+	private void serializePreference(String key, InternalXmlStorageElement element) throws CoreException{
+		Document doc = element.fElement.getOwnerDocument();
+
+		// Transform the document to something we can save in a file
+		ByteArrayOutputStream stream = new ByteArrayOutputStream();
+		FileOutputStream fileStream = null;
+		try {
+			Transformer transformer = TransformerFactory.newInstance().newTransformer();
+			transformer.setOutputProperty(OutputKeys.METHOD, "xml");	//$NON-NLS-1$
+			transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8"); //$NON-NLS-1$
+			transformer.setOutputProperty(OutputKeys.INDENT, "yes");	//$NON-NLS-1$
+			DOMSource source = new DOMSource(doc);
+			StreamResult result = new StreamResult(stream);
+			transformer.transform(source, result);
+
+			// Save the document
+			File file = getPreferenceFile(key);
+			String utfString = stream.toString("UTF-8");	//$NON-NLS-1$
+
+			if (file.exists()) {
+//				if (projectFile.isReadOnly()) {
+//
+//					// Inform Eclipse that we are intending to modify this file
+//					// This will provide the user the opportunity, via UI prompts, to fetch the file from source code control
+//					// reset a read-only file protection to write etc.
+//					// If there is no shell, i.e. shell is null, then there will be no user UI interaction
+//
+//					//TODO
+//					//IStatus status = projectFile.getWorkspace().validateEdit(new IFile[]{projectFile}, shell);
+//
+//					// If the file is still read-only, then we should not attempt the write, since it will
+//					// just fail - just throw an exception, to be caught below, and inform the user
+//					// For other non-successful status, we take our chances, attempt the write, and pass
+//					// along any exception thrown
+//
+//					//if (!status.isOK()) {
+//					 //   if (status.getCode() == IResourceStatus.READ_ONLY_LOCAL) {
+//					  //  	stream.close();
+//	    	           //     throw new CoreException(status);
+//					    //}
+//					//}
+//				}
+//				projectFile.setContents(new ByteArrayInputStream(utfString.getBytes("UTF-8")), IResource.FORCE, new NullProgressMonitor());	//$NON-NLS-1$
+			} else {
+				file.createNewFile();
+			}
+			fileStream = new FileOutputStream(file);
+			byte[] bytes;
+			try {
+				bytes = utfString.getBytes("UTF-8"); //$NON-NLS-1$
+			} catch (UnsupportedEncodingException e){
+				bytes = utfString.getBytes();
+			}
+			fileStream.write(bytes);
+			fileStream.close();
+			// Close the streams
+			stream.close();
+		} catch (TransformerConfigurationException e){
+			throw ExceptionFactory.createCoreException(e);
+		} catch (TransformerException e) {
+			throw ExceptionFactory.createCoreException(e);
+		} catch (IOException e) {
+			throw ExceptionFactory.createCoreException(e);
+		}
+	}
+
+	ICLanguageSetting findLanguagSettingForFile(String fileName, IProject project, ICLanguageSetting settings[]){
+	//	if(cType != null){
+	//		setting = findLanguageSettingForContentTypeId(cType.getId(), settings, true);
+	//		if(setting == null)
+	//			setting = findLanguageSettingForContentTypeId(cType.getId(), settings, false);
+	//	}
+		ICLanguageSetting setting = null;
+		int index = fileName.lastIndexOf('.');
+		if(index > 0){
+			String ext = fileName.substring(index + 1).trim();
+			if(ext.length() > 0){
+				setting = findLanguageSettingForExtension(ext, settings);
+			}
+		}
+		return setting;
+	}
+
+	public ICLanguageSetting findLanguageSettingForContentTypeId(String id, ICLanguageSetting settings[]/*, boolean src*/){
+		for(int i = 0; i < settings.length; i++){
+			String ids[] = settings[i].getSourceContentTypeIds();
+			if(ListComparator.indexOf(id, ids) != -1)
+				return settings[i];
+		}
+		return null;
+	}
+
+	public ICLanguageSetting[] findCompatibleSettingsForContentTypeId(String id, ICLanguageSetting[] settings/*, boolean src*/){
+		IContentTypeManager manager = Platform.getContentTypeManager();
+		IContentType cType = manager.getContentType(id);
+		if(cType != null){
+			String [] exts = cType.getFileSpecs(IContentType.FILE_EXTENSION_SPEC);
+			if(exts != null && exts.length != 0){
+				List<ICLanguageSetting> list = new ArrayList<ICLanguageSetting>();
+				ICLanguageSetting setting;
+				for(int i = 0; i < exts.length; i++){
+					setting = findLanguageSettingForExtension(exts[i], settings/*, src*/);
+					if(setting != null)
+						list.add(setting);
+				}
+				return list.toArray(new ICLanguageSetting[list.size()]);
+			}
+		}
+		return EMPTY_LANGUAGE_SETTINGS_ARRAY;
+	}
+
+	public ICLanguageSetting findLanguageSettingForExtension(String ext, ICLanguageSetting settings[]/*, boolean src*/){
+		ICLanguageSetting setting;
+		for(int i = 0; i < settings.length; i++){
+			setting = settings[i];
+			String exts[] = setting.getSourceExtensions();
+/*			if(src){
+				if(setting.getSourceContentType() == null){
+					exts = setting.getSourceExtensions();
+				}
+			} else {
+				if(setting.getHeaderContentType() == null){
+					exts = setting.getHeaderExtensions();
+				}
+			}
+*/
+			if(exts != null && exts.length != 0){
+				for(int j = 0; j < exts.length; j++){
+					if(ext.equals(exts[j]))
+						return setting;
+				}
+			}
+		}
+		return null;
+	}
+
+	/**
+	 * Returns a map of configurations elements as discovered from the supplied project
+	 * description
+	 * @param des
+	 * @return Map String -> ICStorageElement: configuration name -> configuration ICStorageElement
+	 * @throws CoreException
+	 */
+	Map<String, ICStorageElement> createCfgStorages(ICProjectDescription des) throws CoreException{
+		LinkedHashMap<String, ICStorageElement> map = new LinkedHashMap<String, ICStorageElement>();
+		ICStorageElement rootElement = des.getStorage(MODULE_ID, false);
+		if(rootElement != null){
+			ICStorageElement children[] = rootElement.getChildren();
+
+			for(int i = 0; i < children.length; i++){
+				ICStorageElement el = children[i];
+				if(CONFIGURATION.equals(el.getName())){
+					String id = el.getAttribute(CConfigurationSpecSettings.ID);
+					if(id != null)
+						map.put(id, el);
+				}
+			}
+		}
+		return map;
+	}
+
+	/**
+	 * Create the configuration storage cfgId in the project description
+	 * @param storage the root settingsStorage of the project
+	 * @param cfgId the configuration Id desire
+	 * @return the cfgId as discovered in the project description or a new ICStorageElement with that Id
+	 * @throws CoreException on failure to create storage
+	 */
+	ICStorageElement createStorage(ICSettingsStorage storage, String cfgId) throws CoreException  {
+		ICStorageElement rootElement = storage.getStorage(MODULE_ID, true); // throws CoreException
+		ICStorageElement children[] = rootElement.getChildren();
+		ICStorageElement element = null;
+
+		for(int i = 0; i < children.length; i++){
+			if(CONFIGURATION.equals(children[i].getName())
+					&& cfgId.equals(children[i].getAttribute(CConfigurationSpecSettings.ID))){
+				element = children[i];
+				break;
+			}
+		}
+
+		if(element == null){
+			element = rootElement.createChild(CONFIGURATION);
+			element.setAttribute(CConfigurationSpecSettings.ID, cfgId);
+		}
+
+		return element;
+	}
+
+	/**
+	 * Creates a new configuration storage based on an existing 'base' storage.
+	 * If a configuration with the new ID already exists in the passed in project storage
+	 * a CoreException is thrown.
+	 * @param storage the setting storage of the current project description
+	 * @param cfgId configID of the new configuration - must be unique in
+	 * @param base the base (spec settings) storage element from which settings should be copied.
+	 * @return ICStorageElement representing the new configuration
+	 * @throws CoreException on failure
+	 */
+	ICStorageElement createStorage(ICSettingsStorage storage, String cfgId, ICStorageElement base) throws CoreException{
+		ICStorageElement rootElement = storage.getStorage(MODULE_ID, true);
+		ICStorageElement children[] = rootElement.getChildren();
+		for (ICStorageElement child : children) {
+			if(CONFIGURATION.equals(child.getName())
+					&& cfgId.equals(child.getAttribute(CConfigurationSpecSettings.ID)))
+				throw ExceptionFactory.createCoreException(MessageFormat
+						.format(SettingsModelMessages.getString("CProjectDescriptionManager.cfgIDAlreadyExists"), //$NON-NLS-1$
+								new Object[] {cfgId}));
+		}
+		ICStorageElement config = rootElement.importChild(base);
+		config.setAttribute(CConfigurationSpecSettings.ID, cfgId);
+		return config;
+	}
+
+	/**
+	 * Remove the storage with the supplied configuration Id from the project
+	 * @param storage The root settingsStorage of the project
+	 * @param cfgId the configuration ID which would be
+	 * @throws CoreException
+	 */
+	void removeStorage(ICSettingsStorage storage, String cfgId) throws CoreException{
+		ICStorageElement rootElement = storage.getStorage(MODULE_ID, false);
+		if(rootElement != null){
+			ICStorageElement children[] = rootElement.getChildren();
+
+			for(int i = 0; i < children.length; i++){
+				if(CONFIGURATION.equals(children[i].getName())
+						&& cfgId.equals(children[i].getAttribute(CConfigurationSpecSettings.ID))){
+					rootElement.removeChild(children[i]);
+					break;
+				}
+			}
+		}
+	}
+
+	CConfigurationData loadData(ICConfigurationDescription des, IProgressMonitor monitor) throws CoreException{
+		if(monitor == null)
+			monitor = new NullProgressMonitor();
+
+		CConfigurationDataProvider provider = getProvider(des);
+		return provider.loadConfiguration(des, monitor);
+	}
+
+	CConfigurationData applyData(CConfigurationDescriptionCache des, ICConfigurationDescription baseDescription, CConfigurationData base, SettingsContext context, IProgressMonitor monitor) throws CoreException {
+		if(monitor == null)
+			monitor = new NullProgressMonitor();
+
+		CConfigurationDataProvider provider = getProvider(des);
+		context.init(des);
+		return provider.applyConfiguration(des, baseDescription, base, context, monitor);
+	}
+
+	void notifyCached(ICConfigurationDescription des, CConfigurationData data, IProgressMonitor monitor) {
+		if(monitor == null)
+			monitor = new NullProgressMonitor();
+
+		try {
+			CConfigurationDataProvider provider = getProvider(des);
+			provider.dataCached(des, data, monitor);
+		} catch (CoreException e){
+			CCorePlugin.log(e);
+		}
+	}
+
+	void removeData(ICConfigurationDescription des, CConfigurationData data, IProgressMonitor monitor) throws CoreException{
+		if(monitor == null)
+			monitor = new NullProgressMonitor();
+
+		CConfigurationDataProvider provider = getProvider(des);
+		provider.removeConfiguration(des, data, monitor);
+	}
+
+	CConfigurationData createData(ICConfigurationDescription des, ICConfigurationDescription baseDescription, CConfigurationData base, boolean clone, IProgressMonitor monitor) throws CoreException{
+		if(monitor == null)
+			monitor = new NullProgressMonitor();
+
+		CConfigurationDataProvider provider = getProvider(des);
+		return provider.createConfiguration(des, baseDescription, base, clone, monitor);
+	}
+
+	private CConfigurationDataProvider getProvider(ICConfigurationDescription des) throws CoreException{
+		CConfigurationDataProviderDescriptor providerDes = getCfgProviderDescriptor(des);
+		if(providerDes == null)
+			throw ExceptionFactory.createCoreException(SettingsModelMessages.getString("CProjectDescriptionManager.1")); //$NON-NLS-1$
+
+		return providerDes.getProvider();
+	}
+
+	private CConfigurationDataProviderDescriptor getCfgProviderDescriptor(ICConfigurationDescription des){
+		return getCfgProviderDescriptor(des.getBuildSystemId());
+	}
+
+	private CConfigurationDataProviderDescriptor getCfgProviderDescriptor(String id){
+		initProviderInfo();
+		return fProviderMap.get(id);
+	}
+
+	private void initProviderInfo(){
+		if(fProviderMap != null)
+			return;
+
+		synchronized (this) {
+			if(fProviderMap != null)
+				return;
+
+			IExtensionPoint extensionPoint = Platform.getExtensionRegistry().getExtensionPoint(CConfigurationDataProviderDescriptor.DATA_PROVIDER_EXTPOINT_ID);
+			IExtension exts[] = extensionPoint.getExtensions();
+			fProviderMap = new HashMap<String, CConfigurationDataProviderDescriptor>(exts.length);
+
+			for(int i = 0; i < exts.length; i++){
+				CConfigurationDataProviderDescriptor des = new CConfigurationDataProviderDescriptor(exts[i]);
+				fProviderMap.put(des.getId(), des);
+			}
+		}
+	}
+
+/*	CConfigurationSpecSettings createConfigurationSpecSettings(ICConfigurationDescription cfg) throws CoreException{
+		CConfigurationSpecSettings settings = null;
+		if(cfg instanceof CConfigurationDescriptionCache){
+			settings = new CConfigurationSpecSettings(cfg, createStorage(cfg.getProjectDescription(), cfg.getId()));
+		} else {
+			ICProjectDescription des = getProjecDescription(cfg.getProjectDescription().getProject(), false);
+			CConfigurationDescriptionCache cache = (CConfigurationDescriptionCache)des.getConfigurationById(cfg.getId());
+			if(cache != null){
+				settings = new CConfigurationSpecSettings(cfg, cache.getSpecSettings());
+			} else {
+				settings = new CConfigurationSpecSettings(cfg, createStorage(cfg.getProjectDescription(), cfg.getId()));
+			}
+		}
+		return settings;
+	}
+*/
+
+	public ICStorageElement createPreferenceStorage(String key, boolean createEmptyIfNotFound, boolean readOnly) throws CoreException{
+		try {
+			DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
+			Document doc = null;
+			Element element = null;
+			InputStream stream = null;
+
+				try{
+					stream = getPreferenceProperty(key);
+					if(stream != null){
+						doc = builder.parse(stream);
+
+						// Get the first element in the project file
+						Node rootElement = doc.getFirstChild();
+
+						if (rootElement.getNodeType() != Node.PROCESSING_INSTRUCTION_NODE) {
+							throw ExceptionFactory.createCoreException(SettingsModelMessages.getString("CProjectDescriptionManager.2")); //$NON-NLS-1$
+						} else {
+							String fileVersion = rootElement.getNodeValue();
+							Version version = new Version(fileVersion);
+							// Make sure that the version is compatible with the manager
+							// Version must between min version and current version inclusive
+							if (MIN_DESCRIPTION_VERSION.compareTo(version) > 0 || DESCRIPTION_VERSION.compareTo(version) < 0) {
+								throw ExceptionFactory.createCoreException(SettingsModelMessages.getString("CProjectDescriptionManager.3")); //$NON-NLS-1$
+							}
+						}
+
+						// Now get the project root element (there should be only one)
+						NodeList nodes = doc.getElementsByTagName(ROOT_PREFERENCE_ELEMENT);
+						if (nodes.getLength() == 0)
+							throw ExceptionFactory.createCoreException(SettingsModelMessages.getString("CProjectDescriptionManager.4")); //$NON-NLS-1$
+						Node node = nodes.item(0);
+						if(node.getNodeType() != Node.ELEMENT_NODE)
+							throw ExceptionFactory.createCoreException(SettingsModelMessages.getString("CProjectDescriptionManager.5")); //$NON-NLS-1$
+						element = (Element)node;
+					} else if(!createEmptyIfNotFound){
+						throw ExceptionFactory.createCoreException(SettingsModelMessages.getString("CProjectDescriptionManager.6")); //$NON-NLS-1$
+					}
+				} catch (FactoryConfigurationError e) {
+					if(!createEmptyIfNotFound)
+						throw ExceptionFactory.createCoreException(e.getLocalizedMessage());
+				} catch (SAXException e) {
+					if(!createEmptyIfNotFound)
+						throw ExceptionFactory.createCoreException(e);
+				} catch (IOException e) {
+					if(!createEmptyIfNotFound)
+						throw ExceptionFactory.createCoreException(e);
+				} finally {
+					if(stream != null){
+						try {
+							stream.close();
+						} catch (IOException e) {
+						}
+					}
+				}
+
+			if(element == null) {
+				doc = builder.newDocument();
+				ProcessingInstruction instruction = doc.createProcessingInstruction(VERSION_ELEMENT_NAME, DESCRIPTION_VERSION.toString());
+				doc.appendChild(instruction);
+				element = doc.createElement(ROOT_PREFERENCE_ELEMENT);
+				doc.appendChild(element);
+			}
+			return new InternalXmlStorageElement(element, null, false, readOnly);
+		} catch (ParserConfigurationException e) {
+			throw ExceptionFactory.createCoreException(e);
+		}
+	}
+
+	private InputStream getPreferenceProperty(String key) {
+		InputStream stream = null;
+		File file = getPreferenceFile(key);
+		if (file.exists()) {
+			try {
+				stream = new FileInputStream(file);
+			} catch (FileNotFoundException e) {
+				CCorePlugin.log(e);
+			}
+		}
+		return stream;
+	}
+
+	private File getPreferenceFile(String key){
+		IPath path = CCorePlugin.getDefault().getStateLocation();
+		path = path.append(key);
+		return path.toFile();
+	}
+
+	public static File toLocalFile(URI uri, IProgressMonitor monitor) throws CoreException {
+		IFileStore fileStore = EFS.getStore(uri);
+		File localFile = fileStore.toLocalFile(EFS.NONE, monitor);
+		if (localFile ==null)
+			// non local file system
+			localFile= fileStore.toLocalFile(EFS.CACHE, monitor);
+		return localFile;
+	}
+
+	ICDescriptionDelta createDelta(ICProjectDescription newDescription, ICProjectDescription oldDescription){
+		CProjectDescriptionDelta delta = new CProjectDescriptionDelta(newDescription, oldDescription);
+
+		if(delta.getDeltaKind() == ICDescriptionDelta.CHANGED){
+			ICConfigurationDescription[] cfgs = newDescription.getConfigurations();
+			for(int i = 0; i < cfgs.length; i++){
+				ICConfigurationDescription oldCfg = oldDescription.getConfigurationById(cfgs[i].getId());
+				CProjectDescriptionDelta cfgDelta = createDelta(cfgs[i], oldCfg);
+				if(cfgDelta != null){
+					delta.addChild(cfgDelta);
+				}
+			}
+
+			cfgs = oldDescription.getConfigurations();
+			for(int i = 0; i < cfgs.length; i++){
+				ICConfigurationDescription newCfg = newDescription.getConfigurationById(cfgs[i].getId());
+				if(newCfg == null)
+					delta.addChild(createDelta(null, cfgs[i]));
+			}
+
+			if(checkCfgChange(newDescription, oldDescription, true))
+				delta.addChangeFlags(ICDescriptionDelta.ACTIVE_CFG);
+
+			if(checkCfgChange(newDescription, oldDescription, false))
+				delta.addChangeFlags(ICDescriptionDelta.INDEX_CFG);
+
+			if(oldDescription.isCdtProjectCreating() && !newDescription.isCdtProjectCreating())
+				delta.addChangeFlags(ICDescriptionDelta.PROJECT_CREAION_COMPLETED);
+		}
+		return delta.isEmpty() ? null : delta;
+	}
+
+	private boolean checkCfgChange(ICProjectDescription newDes, ICProjectDescription oldDes, boolean active){
+		ICConfigurationDescription newCfg, oldCfg;
+
+		if(active){
+			newCfg = newDes.getActiveConfiguration();
+			oldCfg = oldDes.getActiveConfiguration();
+		} else {
+			newCfg = newDes.getDefaultSettingConfiguration();
+			oldCfg = oldDes.getDefaultSettingConfiguration();
+		}
+
+		if(newCfg == null){
+			return oldCfg != null;
+		} else if (oldCfg == null){
+			return true;
+		}
+		return !newCfg.getId().equals(oldCfg.getId());
+	}
+
+/*	void postProcessNewDescriptionCache(CProjectDescription des, ICProjectDescriptionDelta delta){
+		if(delta == null && delta.getDeltaKind() != ICProjectDescriptionDelta.CHANGED)
+			return;
+
+		ICConfigurationDescription indexCfg = des.getIndexConfiguration();
+		ICConfigurationDescription activeCfg = des.getActiveConfiguration();
+		ICProjectDescriptionDelta activeCfgDelta = findDelta(activeCfg.getId(), delta);
+		if(indexCfg != activeCfg){
+			switch(activeCfgDelta.getDeltaKind()){
+			case ICProjectDescriptionDelta.CHANGED:
+				des.setIndexConfiguration(activeCfg);
+			}
+		}
+
+
+	}
+*/
+	private ICDescriptionDelta findDelta(String id, ICDescriptionDelta delta){
+		ICDescriptionDelta children[] = delta.getChildren();
+		ICSettingObject obj;
+		for(int i = 0; i < children.length; i++){
+			obj = children[i].getSetting();
+			if(obj.getId().equals(id))
+				return children[i];
+		}
+		return null;
+	}
+
+	public int calculateDescriptorFlags(ICConfigurationDescription newCfg, ICConfigurationDescription oldCfg){
+		try {
+			int flags = 0;
+			CConfigurationSpecSettings newSettings = ((IInternalCCfgInfo)newCfg).getSpecSettings();
+			CConfigurationSpecSettings oldSettings = ((IInternalCCfgInfo)oldCfg).getSpecSettings();
+			String newId = newSettings.getCOwnerId();
+			String oldId = oldSettings.getCOwnerId();
+			if(!CDataUtil.objectsEqual(newId, oldId))
+				flags |= ICDescriptionDelta.OWNER;
+
+			Map<String, CConfigExtensionReference[]> newMap = newSettings.getExtensionMapCopy();
+			Map<String, CConfigExtensionReference[]> oldMap = oldSettings.getExtensionMapCopy();
+
+			for(Iterator<Map.Entry<String, CConfigExtensionReference[]>> iter = newMap.entrySet().iterator(); iter.hasNext();){
+				Map.Entry entry = iter.next();
+				iter.remove();
+				CConfigExtensionReference[] oldRefs = oldMap.remove(entry.getKey());
+				if(oldRefs == null){
+					flags |= ICDescriptionDelta.EXT_REF;
+					break;
+				}
+
+				CConfigExtensionReference[] newRefs = (CConfigExtensionReference[])entry.getValue();
+				if(newRefs.length != oldRefs.length){
+					flags |= ICDescriptionDelta.EXT_REF;
+					break;
+				}
+
+				Set<CConfigExtensionReference> newSet = new HashSet<CConfigExtensionReference>(Arrays.asList(newRefs));
+				Set<CConfigExtensionReference> oldSet = new HashSet<CConfigExtensionReference>(Arrays.asList(oldRefs));
+				if(newSet.size() != oldSet.size()){
+					flags |= ICDescriptionDelta.EXT_REF;
+					break;
+				}
+
+				newSet.removeAll(oldSet);
+				if(newSet.size() != 0){
+					flags |= ICDescriptionDelta.EXT_REF;
+					break;
+				}
+			}
+
+			return flags;
+		} catch (CoreException e) {
+			CCorePlugin.log(e);
+		}
+		return 0;
+	}
+
+	public CProjectDescriptionDelta createDelta(ICConfigurationDescription newCfg, ICConfigurationDescription oldCfg){
+		CProjectDescriptionDelta delta = new CProjectDescriptionDelta(newCfg, oldCfg);
+		IInternalCCfgInfo newInfo = (IInternalCCfgInfo)newCfg;
+		IInternalCCfgInfo oldInfo = (IInternalCCfgInfo)oldCfg;
+		if(delta.getDeltaKind() == ICDescriptionDelta.CHANGED){
+			ICFolderDescription[] foDess = newCfg.getFolderDescriptions();
+			for(int i = 0; i < foDess.length; i++){
+				ICResourceDescription oldDes = oldCfg.getResourceDescription(foDess[i].getPath(), true);
+				if(oldDes != null && oldDes.getType() == ICSettingBase.SETTING_FOLDER){
+					CProjectDescriptionDelta foDelta = createDelta(foDess[i], (ICFolderDescription)oldDes);
+					if(foDelta != null)
+						delta.addChild(foDelta);
+				} else {
+					delta.addChild(createDelta(foDess[i], null));
+				}
+			}
+
+			foDess = oldCfg.getFolderDescriptions();
+			for(int i = 0; i < foDess.length; i++){
+				ICResourceDescription newDes = newCfg.getResourceDescription(foDess[i].getPath(), true);
+				if(newDes == null || newDes.getType() != ICSettingBase.SETTING_FOLDER){
+					delta.addChild(createDelta(null, foDess[i]));
+				}
+			}
+
+			ICFileDescription[] fiDess = newCfg.getFileDescriptions();
+			for(int i = 0; i < fiDess.length; i++){
+				ICResourceDescription oldDes = oldCfg.getResourceDescription(fiDess[i].getPath(), true);
+				if(oldDes != null && oldDes.getType() == ICSettingBase.SETTING_FILE){
+					CProjectDescriptionDelta fiDelta = createDelta(fiDess[i], (ICFileDescription)oldDes);
+					if(fiDelta != null)
+						delta.addChild(fiDelta);
+				} else {
+					delta.addChild(createDelta(fiDess[i], null));
+				}
+			}
+
+			fiDess = oldCfg.getFileDescriptions();
+			for(int i = 0; i < fiDess.length; i++){
+				ICResourceDescription newDes = newCfg.getResourceDescription(fiDess[i].getPath(), true);
+				if(newDes == null || newDes.getType() != ICSettingBase.SETTING_FILE){
+					delta.addChild(createDelta(null, fiDess[i]));
+				}
+			}
+
+			CProjectDescriptionDelta tpsDelta = createDelta(newCfg.getTargetPlatformSetting(), oldCfg.getTargetPlatformSetting());
+			if(tpsDelta != null)
+				delta.addChild(tpsDelta);
+
+			if(!newCfg.getName().equals(oldCfg.getName())){
+				delta.addChangeFlags(ICDescriptionDelta.NAME);
+			}
+
+			ICSourceEntry newEntries[] = newCfg.getSourceEntries();
+			ICSourceEntry oldEntries[] = oldCfg.getSourceEntries();
+
+			if(newEntries.length > oldEntries.length){
+				delta.addChangeFlags(ICDescriptionDelta.SOURCE_ADDED);
+			} else {
+				ICSourceEntry newEntry;
+				for(int i = 0; i < newEntries.length; i++){
+					boolean found = false;
+					newEntry = newEntries[i];
+					for(int j = 0; j < oldEntries.length; j++){
+						if(newEntry.equals(oldEntries[j])){
+							found = true;
+							break;
+						}
+					}
+
+					if(!found){
+						delta.addChangeFlags(ICDescriptionDelta.SOURCE_ADDED);
+						break;
+					}
+				}
+			}
+
+			if(oldEntries.length > newEntries.length){
+				delta.addChangeFlags(ICDescriptionDelta.SOURCE_REMOVED);
+			} else {
+				ICSourceEntry oldEntry;
+				for(int i = 0; i < oldEntries.length; i++){
+					boolean found = false;
+					oldEntry = oldEntries[i];
+					for(int j = 0; j < newEntries.length; j++){
+						if(oldEntry.equals(newEntries[j])){
+							found = true;
+							break;
+						}
+					}
+
+					if(!found){
+						delta.addChangeFlags(ICDescriptionDelta.SOURCE_REMOVED);
+						break;
+					}
+				}
+			}
+
+			try {
+				CConfigurationSpecSettings newSettings = newInfo.getSpecSettings();
+				CConfigurationSpecSettings oldSettings = oldInfo.getSpecSettings();
+				if(!newSettings.extRefSettingsEqual(oldSettings))
+					delta.addChangeFlags(ICDescriptionDelta.EXT_REF);
+			} catch (CoreException e){
+				CCorePlugin.log(e);
+			}
+
+
+			calculateCfgExtSettingsDelta(delta);
+
+			int drFlags = calculateDescriptorFlags(newCfg, oldCfg);
+			if(drFlags != 0)
+				delta.addChangeFlags(drFlags);
+		}
+
+		return delta.isEmpty() ? null : delta;
+	}
+
+	private void calculateCfgExtSettingsDelta(CProjectDescriptionDelta delta){
+		ICConfigurationDescription newDes = (ICConfigurationDescription)delta.getNewSetting();
+		ICConfigurationDescription oldDes = (ICConfigurationDescription)delta.getOldSetting();
+		ExtSettingsDelta[] deltas = getSettingChange(newDes, oldDes);
+		int flags = 0;
+		int addedRemoved = ICDescriptionDelta.EXTERNAL_SETTINGS_ADDED | ICDescriptionDelta.EXTERNAL_SETTINGS_REMOVED;
+		if(deltas != null ){
+			for(int i = 0; i < deltas.length; i++){
+				ICSettingEntry[][] d = deltas[i].getEntriesDelta();
+				if(d[0] != null)
+					flags |= ICDescriptionDelta.EXTERNAL_SETTINGS_ADDED;
+				if(d[1] != null)
+					flags |= ICDescriptionDelta.EXTERNAL_SETTINGS_REMOVED;
+
+				if((flags & (addedRemoved)) == addedRemoved)
+					break;
+			}
+//			delta.setExtSettingsDeltas(deltas);
+			if(flags != 0)
+				delta.addChangeFlags(flags);
+		}
+
+		int cfgRefFlags = calcRefChangeFlags(newDes, oldDes);
+		if(cfgRefFlags != 0)
+			delta.addChangeFlags(cfgRefFlags);
+	}
+
+	private int calcRefChangeFlags(ICConfigurationDescription newDes, ICConfigurationDescription oldDes){
+		Map<String, String> newMap = newDes != null ? newDes.getReferenceInfo() : null;
+		Map<String, String> oldMap = oldDes != null ? oldDes.getReferenceInfo() : null;
+
+		int flags = 0;
+		if(newMap == null || newMap.size() == 0){
+			if(oldMap != null && oldMap.size() != 0){
+				flags = ICDescriptionDelta.CFG_REF_REMOVED;
+			}
+		} else {
+			if(oldMap == null || oldMap.size() == 0){
+				flags = ICDescriptionDelta.CFG_REF_ADDED;
+			} else {
+				boolean stop = false;
+				for(Iterator iter = newMap.entrySet().iterator(); iter.hasNext();){
+					Map.Entry newEntry = (Map.Entry)iter.next();
+					Object newProj = newEntry.getKey();
+					Object newCfg = newEntry.getValue();
+					Object oldCfg = oldMap.remove(newProj);
+					if(!newCfg.equals(oldCfg)){
+						flags |= ICDescriptionDelta.CFG_REF_ADDED;
+						if(oldCfg != null){
+							flags |= ICDescriptionDelta.CFG_REF_REMOVED;
+							stop = true;
+						}
+						if(stop)
+							break;
+					}
+				}
+
+				if(!oldMap.isEmpty())
+					flags |= ICDescriptionDelta.CFG_REF_REMOVED;
+			}
+		}
+
+		return flags;
+	}
+
+
+	private ExtSettingsDelta[] getSettingChange(ICConfigurationDescription newDes, ICConfigurationDescription oldDes){
+		CExternalSetting[] newSettings = newDes != null ? (CExternalSetting[])newDes.getExternalSettings() : null;
+		CExternalSetting[] oldSettings = oldDes != null ? (CExternalSetting[])oldDes.getExternalSettings() : null;
+		return CExternalSettinsDeltaCalculator.getInstance().getSettingChange(newSettings, oldSettings);
+	}
+
+	private CProjectDescriptionDelta createDelta(ICFolderDescription newFo, ICFolderDescription oldFo){
+		CProjectDescriptionDelta delta = new CProjectDescriptionDelta(newFo, oldFo);
+
+		if(delta.getDeltaKind() == ICDescriptionDelta.CHANGED){
+			ICLanguageSetting newLss[] = newFo.getLanguageSettings();
+			ICLanguageSetting oldLss[] = oldFo.getLanguageSettings();
+			List<ICLanguageSetting> newList = new ArrayList<ICLanguageSetting>(Arrays.asList(newLss));
+			List<ICLanguageSetting> oldList = new ArrayList<ICLanguageSetting>(Arrays.asList(oldLss));
+			List<ICLanguageSetting[]> matched = sortSettings(newList, oldList);
+
+			for(Iterator<ICLanguageSetting[]> iter = matched.iterator(); iter.hasNext();){
+				ICLanguageSetting[] match = iter.next();
+				CProjectDescriptionDelta lsDelta = createDelta(match[0], match[1]);
+				if(lsDelta != null)
+					delta.addChild(lsDelta);
+			}
+
+			for(Iterator<ICLanguageSetting> iter = newList.iterator(); iter.hasNext();){
+				ICLanguageSetting added = iter.next();
+				delta.addChild(createDelta(added, null));
+			}
+
+			for(Iterator<ICLanguageSetting> iter = oldList.iterator(); iter.hasNext();){
+				ICLanguageSetting removed = iter.next();
+				delta.addChild(createDelta(null, removed));
+			}
+
+//			HashMap oldMap = new HashMap();
+//			for(int i = 0; i < oldLss.length; i++){
+//				oldMap.put(oldLss[i].getId(), oldLss[i]);
+//			}
+
+//			for(int i = 0; i < newLss.length; i++){
+//				ICLanguageSetting oldLs = (ICLanguageSetting)oldMap.remove(newLss[i].getId());
+//				CProjectDescriptionDelta lsDelta = createDelta(newLss[i], oldLs);
+//				if(lsDelta != null)
+//					delta.addChild(lsDelta);
+//			}
+
+//			if(!oldMap.isEmpty()){
+//				for(Iterator iter = oldMap.values().iterator(); iter.hasNext();){
+//					delta.addChild(createDelta(null, (ICLanguageSetting)iter.next()));
+//				}
+//			}
+
+//			if(!newFo.getPath().equals(oldFo.getPath()))
+//				delta.addChangeFlags(ICProjectDescriptionDelta.PATH);
+
+			if(newFo.isExcluded() != oldFo.isExcluded())
+				delta.addChangeFlags(ICDescriptionDelta.EXCLUDE);
+		}
+
+		return delta.isEmpty() ? null : delta;
+	}
+
+	private List<ICLanguageSetting[]> sortSettings(List<ICLanguageSetting> settings1,
+			List<ICLanguageSetting> settings2){
+		ICLanguageSetting setting1;
+		ICLanguageSetting setting2;
+		List<ICLanguageSetting[]> result = new ArrayList<ICLanguageSetting[]>();
+		for(Iterator<ICLanguageSetting> iter1 = settings1.iterator(); iter1.hasNext();){
+			setting1 = iter1.next();
+			for(Iterator<ICLanguageSetting> iter2 = settings2.iterator(); iter2.hasNext();){
+				setting2 = iter2.next();
+
+				if(setting2.getId().equals(setting1.getId())){
+					iter1.remove();
+					iter2.remove();
+					ICLanguageSetting [] match = new ICLanguageSetting[2];
+					match[0] = setting1;
+					match[1] = setting2;
+					result.add(match);
+					break;
+				}
+			}
+		}
+
+		for(Iterator<ICLanguageSetting> iter1 = settings1.iterator(); iter1.hasNext();){
+			setting1 = iter1.next();
+			String lId = setting1.getLanguageId();
+			if(lId != null){
+				for(Iterator<ICLanguageSetting> iter2 = settings2.iterator(); iter2.hasNext();){
+					setting2 = iter2.next();
+
+					if(lId.equals(setting2.getLanguageId())){
+						iter1.remove();
+						iter2.remove();
+						ICLanguageSetting [] match = new ICLanguageSetting[2];
+						match[0] = setting1;
+						match[1] = setting2;
+						result.add(match);
+						break;
+					}
+				}
+			}
+		}
+
+		for(Iterator<ICLanguageSetting> iter1 = settings1.iterator(); iter1.hasNext();){
+			setting1 = iter1.next();
+			String cTypeIds1[] = setting1.getSourceContentTypeIds();
+			if(cTypeIds1.length != 0){
+				for(Iterator<ICLanguageSetting> iter2 = settings2.iterator(); iter2.hasNext();){
+					setting2 = iter2.next();
+					if(Arrays.equals(cTypeIds1, setting2.getSourceContentTypeIds())){
+						iter1.remove();
+						iter2.remove();
+						ICLanguageSetting [] match = new ICLanguageSetting[2];
+						match[0] = setting1;
+						match[1] = setting2;
+						result.add(match);
+						break;
+					}
+				}
+			}
+		}
+
+		for(Iterator<ICLanguageSetting> iter1 = settings1.iterator(); iter1.hasNext();){
+			setting1 = iter1.next();
+			if(setting1.getSourceContentTypeIds().length == 0){
+				String srcExts[]  = setting1.getSourceExtensions();
+				if(srcExts.length != 0){
+					for(Iterator<ICLanguageSetting> iter2 = settings2.iterator(); iter2.hasNext();){
+						setting2 = iter2.next();
+						if(setting2.getSourceContentTypeIds().length == 0){
+							if(Arrays.equals(srcExts, setting2.getSourceExtensions())){
+								iter1.remove();
+								iter2.remove();
+								ICLanguageSetting [] match = new ICLanguageSetting[2];
+								match[0] = setting1;
+								match[1] = setting2;
+								result.add(match);
+								break;
+							}
+						}
+					}
+				}
+			}
+		}
+		return result;
+	}
+
+	private CProjectDescriptionDelta createDelta(ICFileDescription newFi, ICFileDescription oldFi){
+		CProjectDescriptionDelta delta = new CProjectDescriptionDelta(newFi, oldFi);
+
+		if(delta.getDeltaKind() == ICDescriptionDelta.CHANGED){
+			CProjectDescriptionDelta lsDelta = createDelta(newFi.getLanguageSetting(), oldFi.getLanguageSetting());
+			if(lsDelta != null)
+				delta.addChild(lsDelta);
+
+//			if(!newFi.getPath().equals(oldFi.getPath()))
+//				delta.addChangeFlags(ICProjectDescriptionDelta.PATH);
+
+			if(newFi.isExcluded() != oldFi.isExcluded())
+				delta.addChangeFlags(ICDescriptionDelta.EXCLUDE);
+		}
+
+		return delta.isEmpty() ? null : delta;
+	}
+
+	private CProjectDescriptionDelta createDelta(ICLanguageSetting newLs, ICLanguageSetting oldLs){
+		CProjectDescriptionDelta delta = new CProjectDescriptionDelta(newLs, oldLs);
+
+		if(delta.getDeltaKind() == ICDescriptionDelta.CHANGED){
+			int kinds[] = KindBasedStore.getLanguageEntryKinds();
+			int kind;
+			int addedKinds = 0;
+			int removedKinds = 0;
+			int reorderedKinds = 0;
+			for(int i = 0; i < kinds.length; i++){
+				kind = kinds[i];
+				ICLanguageSettingEntry newEntries[] = newLs.getSettingEntries(kind);
+				ICLanguageSettingEntry oldEntries[] = oldLs.getSettingEntries(kind);
+				boolean[] change = calculateSettingsChanges(newEntries, oldEntries);
+
+				if(change[0])
+					addedKinds |= kind;
+				if(change[1])
+					removedKinds |= kind;
+				if(change[2])
+					reorderedKinds |= kind;
+			}
+			delta.setAddedLanguageEntriesKinds(addedKinds);
+			delta.setRemovedLanguageEntriesKinds(removedKinds);
+			delta.setReorderedLanguageEntriesKinds(reorderedKinds);
+
+			String[] newCtIds = newLs.getSourceContentTypeIds();
+			String[] oldCtIds = oldLs.getSourceContentTypeIds();
+
+			if(!Arrays.equals(newCtIds, oldCtIds))
+				delta.addChangeFlags(ICDescriptionDelta.SOURCE_CONTENT_TYPE);
+
+
+			String[] newExts = newLs.getSourceExtensions();
+			String[] oldExts = oldLs.getSourceExtensions();
+			if(!Arrays.equals(newExts, oldExts))
+				delta.addChangeFlags(ICDescriptionDelta.SOURCE_ENTENSIONS);
+
+
+//			newCt = newLs.getHeaderContentType();
+//			oldCt = oldLs.getHeaderContentType();
+
+//			if(!compare(newCt, oldCt))
+//				delta.addChangeFlags(ICDescriptionDelta.HEADER_CONTENT_TYPE);
+
+//			newExts = newLs.getHeaderExtensions();
+//			oldExts = oldLs.getHeaderExtensions();
+//			if(!Arrays.equals(newExts, oldExts))
+//				delta.addChangeFlags(ICDescriptionDelta.HEADER_ENTENSIONS);
+		}
+
+		return delta.isEmpty() ? null : delta;
+	}
+
+	private boolean[] calculateSettingsChanges(ICLanguageSettingEntry newEntries[], ICLanguageSettingEntry oldEntries[]) {
+		boolean result[] = new boolean[3];
+
+		// if nothing was known before do not generate any deltas.
+		if (oldEntries == null) {
+			return result;
+		}
+		// Sanity checks
+		if (newEntries == null) {
+			newEntries = EMPTY_LANGUAGE_SETTINGS_ENTRIES_ARRAY;
+		}
+
+		// Check the removed entries.
+		for (int i = 0; i < oldEntries.length; i++) {
+			boolean found = false;
+			for (int j = 0; j < newEntries.length; j++) {
+				if (oldEntries[i].equals(newEntries[j])) {
+					found = true;
+					break;
+				}
+			}
+			if(!found){
+				result[1] = true;
+				break;
+			}
+		}
+
+		// Check the new entries.
+		for (int i = 0; i < newEntries.length; i++) {
+			boolean found = false;
+			for (int j = 0; j < oldEntries.length; j++) {
+				if (newEntries[i].equals(oldEntries[j])) {
+					found = true;
+					break;
+				}
+			}
+			if(!found){
+				result[0] = true;
+				break;
+			}
+		}
+
+		// Check for reorder
+		if (!result[0] && !result[1] && oldEntries.length == newEntries.length) {
+			for (int i = 0; i < newEntries.length; i++) {
+				if (!newEntries[i].equals(oldEntries[i])) {
+					result[2] = true;
+					break;
+				}
+			}
+		}
+		// They may have remove some duplications, catch here .. consider it as reordering.
+		if (!result[0] && !result[1] && oldEntries.length != newEntries.length) {
+			result[2] = true;
+		}
+
+		return result;
+	}
+
+/*	public boolean entriesEqual(ICLanguageSettingEntry entries1[], ICLanguageSettingEntry entries2[]){
+		if(entries1.length != entries2.length)
+			return false;
+
+		for(int i = 0; i < entries1.length; i++){
+			if(!entries1[i].equals(entries2[i]))
+				return false;
+		}
+
+		return true;
+	}
+*/
+	private CProjectDescriptionDelta createDelta(ICTargetPlatformSetting newTPS, ICTargetPlatformSetting oldTPS){
+		CProjectDescriptionDelta delta = new CProjectDescriptionDelta(newTPS, oldTPS);
+		if(!Arrays.equals(newTPS.getBinaryParserIds(), oldTPS.getBinaryParserIds()))
+			delta.addChangeFlags(ICDescriptionDelta.BINARY_PARSER_IDS);
+
+		return delta.isEmpty() ? null : delta;
+	}
+
+	ICElementDelta[] generateCElementDeltas(ICProject cProject, ICDescriptionDelta projDesDelta){
+		if(projDesDelta == null)
+			return EMPTY_CELEMENT_DELTA;
+
+		int kind = projDesDelta.getDeltaKind();
+		switch(kind){
+		case ICDescriptionDelta.CHANGED:
+			ICProjectDescription newDes = (ICProjectDescription)projDesDelta.getNewSetting();
+			ICProjectDescription oldDes = (ICProjectDescription)projDesDelta.getOldSetting();
+//			int flags = projDesDelta.getChangeFlags();
+//			ICConfigurationDescription activeCfg = newDes.getActiveConfiguration();
+			ICConfigurationDescription indexCfg = newDes.getDefaultSettingConfiguration();
+//			if(indexCfg != activeCfg){
+//				ICDescriptionDelta delta = findDelta(activeCfg.getId(), projDesDelta);
+//				if(delta != null && delta.getDeltaKind() == ICDescriptionDelta.CHANGED){
+//					indexCfg = activeCfg;
+//					newDes.setIndexConfiguration(activeCfg);
+//				}
+//			}
+			ICConfigurationDescription oldIndexCfg = oldDes.getDefaultSettingConfiguration();
+			ICDescriptionDelta indexDelta;
+			if(oldIndexCfg != null && oldIndexCfg.getId().equals(indexCfg.getId())){
+				indexDelta = findDelta(indexCfg.getId(), projDesDelta);
+			} else {
+				indexDelta = createDelta(indexCfg, oldIndexCfg);
+			}
+			if(indexDelta != null){
+				List<CElementDelta> list = new ArrayList<CElementDelta>();
+				generateCElementDeltasFromCfgDelta(cProject, indexDelta, list);
+				return list.toArray(new ICElementDelta[list.size()]);
+			}
+			return EMPTY_CELEMENT_DELTA;
+		case ICDescriptionDelta.ADDED:
+		case ICDescriptionDelta.REMOVED:
+			break;
+		}
+		return EMPTY_CELEMENT_DELTA;
+	}
+
+	private List<CElementDelta> generateCElementDeltasFromCfgDelta(ICProject cProject, ICDescriptionDelta cfgDelta, List<CElementDelta> list){
+		int kind = cfgDelta.getDeltaKind();
+		switch(kind){
+		case ICDescriptionDelta.CHANGED:
+			int descriptionFlags = cfgDelta.getChangeFlags();
+			int celementFlags = 0;
+			if((descriptionFlags & ICDescriptionDelta.SOURCE_ADDED) != 0)
+				celementFlags |= ICElementDelta.F_ADDED_PATHENTRY_SOURCE;
+			if((descriptionFlags & ICDescriptionDelta.SOURCE_REMOVED) != 0)
+				celementFlags |= ICElementDelta.F_REMOVED_PATHENTRY_SOURCE;
+
+			if(celementFlags != 0){
+				CElementDelta cElDelta = new CElementDelta(cProject.getCModel());
+				cElDelta.changed(cProject, celementFlags);
+				list.add(cElDelta);
+			}
+
+			ICDescriptionDelta children[] = cfgDelta.getChildren();
+			ICDescriptionDelta child;
+			int type;
+			for(int i = 0; i < children.length; i++){
+				child = children[i];
+				type = child.getSettingType();
+				if(type == ICSettingBase.SETTING_FILE || type == ICSettingBase.SETTING_FOLDER){
+					generateCElementDeltasFromResourceDelta(cProject, child, list);
+				}
+			}
+		case ICDescriptionDelta.ADDED:
+		case ICDescriptionDelta.REMOVED:
+			break;
+		}
+		return list;
+	}
+
+	private List<CElementDelta> generateCElementDeltasFromResourceDelta(ICProject cProject, ICDescriptionDelta delta, List<CElementDelta> list){
+		int kind = delta.getDeltaKind();
+		ICDescriptionDelta parentDelta = delta.getParent();
+		ICElement el;
+//		IProject project = cProject.getProject();
+		IResource rc = null;
+
+		ICResourceDescription oldRcDes;
+		ICResourceDescription newRcDes;
+		IPath path;
+		switch(kind){
+		case ICDescriptionDelta.REMOVED:
+			oldRcDes = (ICResourceDescription)delta.getOldSetting();
+			path = oldRcDes.getPath();
+			newRcDes = ((ICConfigurationDescription)parentDelta.getNewSetting()).getResourceDescription(path, false);
+			break;
+		case ICDescriptionDelta.CHANGED:
+//			if((delta.getChangeFlags() & ICProjectDescriptionDelta.PATH) == 0){
+				newRcDes = (ICResourceDescription)delta.getNewSetting();
+				path = newRcDes.getPath();
+				oldRcDes = (ICResourceDescription)delta.getOldSetting();
+				break;
+//			}
+			//if path changed treat as added
+		case ICDescriptionDelta.ADDED:
+		default:
+			newRcDes = (ICResourceDescription)delta.getNewSetting();
+			path = newRcDes.getPath();
+			oldRcDes = ((ICConfigurationDescription)parentDelta.getOldSetting()).getResourceDescription(path, false);
+			break;
+		}
+		path = path.makeRelative();
+		el = null;
+		try {
+			el = cProject.findElement(path);
+			rc = el.getResource();
+		} catch (CModelException e) {
+//			int i = 0;
+		}
+//			rc = ResourcesPlugin.getWorkspace().getRoot().findMember(project.getFullPath().append(path));
+		if(rc != null){
+			if(rc.getType() == IResource.FILE){
+				String fileName = path.lastSegment();
+				ICLanguageSetting newLS = getLanguageSetting(newRcDes, fileName);
+				ICLanguageSetting oldLS = getLanguageSetting(oldRcDes, fileName);
+				ICDescriptionDelta ld = createDelta(newLS, oldLS);
+				generateCElementDeltasFromLanguageDelta(el, ld, list);
+			} else {
+				if(newRcDes.getType() == ICSettingBase.SETTING_FOLDER){
+					ICFolderDescription oldFoDes = null;
+					if (oldRcDes != null) {
+						if (oldRcDes.getType() == ICSettingBase.SETTING_FOLDER)
+							oldFoDes = (ICFolderDescription)oldRcDes;
+					}
+					ICDescriptionDelta folderDelta = createDelta((ICFolderDescription)newRcDes, oldFoDes);
+					if(folderDelta != null){
+						ICDescriptionDelta children[] = folderDelta.getChildren();
+						ICDescriptionDelta child;
+						for(int i = 0; i < children.length; i++){
+							child = children[i];
+							if(child.getSettingType() == ICSettingBase.SETTING_LANGUAGE){
+								generateCElementDeltasFromLanguageDelta(el, child, list);
+							}
+						}
+					}
+				} else {
+					//ERROR?
+				}
+
+			}
+		}
+		return list;
+	}
+
+	private ICLanguageSetting getLanguageSetting(ICResourceDescription rcDes, String fileName){
+		if(rcDes.getType() == ICSettingBase.SETTING_FILE){
+			return ((ICFileDescription)rcDes).getLanguageSetting();
+		}
+		return ((ICFolderDescription)rcDes).getLanguageSettingForFile(fileName);
+	}
+
+	private List<CElementDelta> generateCElementDeltasFromLanguageDelta(ICElement el, ICDescriptionDelta delta, List<CElementDelta> list){
+		if(delta == null)
+			return list;
+
+		int flags = 0;
+		flags |= calculateEntriesFlags(delta.getAddedEntriesKinds(), true);
+		flags |= calculateEntriesFlags(delta.getRemovedEntriesKinds(), false);
+		flags |= calculateEntriesFlags(delta.getReorderedEntriesKinds(), true);
+		if(flags != 0){
+			CElementDelta cElDelta = new CElementDelta(el.getCModel());
+			cElDelta.changed(el, flags);
+			list.add(cElDelta);
+		}
+		return list;
+	}
+
+	private int calculateEntriesFlags(int languageDeltaKinds, boolean added){
+		int flags = 0;
+		int kindsArray[] = kindsToArray(languageDeltaKinds);
+
+		for(int i = 0; i < kindsArray.length; i++){
+			switch(kindsArray[i]){
+			case ICLanguageSettingEntry.INCLUDE_PATH:
+				flags |= ICElementDelta.F_CHANGED_PATHENTRY_INCLUDE;
+				break;
+			case ICLanguageSettingEntry.INCLUDE_FILE:
+				flags |= ICElementDelta.F_CHANGED_PATHENTRY_INCLUDE;
+				break;
+			case ICLanguageSettingEntry.MACRO:
+				flags |= ICElementDelta.F_CHANGED_PATHENTRY_MACRO;
+				break;
+			case ICLanguageSettingEntry.MACRO_FILE:
+				flags |= ICElementDelta.F_CHANGED_PATHENTRY_MACRO;
+				break;
+			case ICLanguageSettingEntry.LIBRARY_PATH:
+				flags |= added ? ICElementDelta.F_ADDED_PATHENTRY_LIBRARY
+						: ICElementDelta.F_REMOVED_PATHENTRY_LIBRARY;
+				break;
+			case ICLanguageSettingEntry.LIBRARY_FILE:
+				flags |= added ? ICElementDelta.F_ADDED_PATHENTRY_LIBRARY
+						: ICElementDelta.F_REMOVED_PATHENTRY_LIBRARY;
+				break;
+			}
+		}
+		return flags;
+	}
+
+	int[] kindsToArray(int kinds){
+		int allKinds[] = KindBasedStore.getLanguageEntryKinds();
+		int kindsArray[] = new int[allKinds.length];
+		int num = 0;
+		for(int i = 0; i < allKinds.length; i++){
+			if((allKinds[i] & kinds) != 0){
+				kindsArray[num++] = allKinds[i];
+			}
+		}
+
+		if(num < allKinds.length){
+			int tmp[] = new int[num];
+			if(num > 0)
+				System.arraycopy(kindsArray, 0, tmp, 0, num);
+			kindsArray = tmp;
+		}
+		return kindsArray;
+	}
+
+	/*
+	 * Methods for manipulating the set of project description listeners
+	 */
+
+	public void addCProjectDescriptionListener(ICProjectDescriptionListener listener, int eventTypes) {
+		fListeners.add(new ListenerDescriptor(listener, eventTypes));
+	}
+
+	public void removeCProjectDescriptionListener(ICProjectDescriptionListener listener) {
+		fListeners.remove(listener);
+	}
+
+	public void notifyListeners(CProjectDescriptionEvent event){
+		int eventType = event.getEventType();
+		for (ListenerDescriptor listener : fListeners) {
+			if (listener.handlesEvent(eventType))
+				listener.fListener.handleEvent(event);
+		}
+	}
+
+	void checkRemovedConfigurations(ICDescriptionDelta delta){
+		if(delta == null)
+			return;
+
+		ICDescriptionDelta cfgDeltas[] = delta.getChildren();
+		for(int i = 0; i < cfgDeltas.length; i++){
+			if(cfgDeltas[i].getDeltaKind() == ICDescriptionDelta.REMOVED){
+				CConfigurationDescriptionCache des = (CConfigurationDescriptionCache)cfgDeltas[i].getOldSetting();
+				CConfigurationData data = des.getConfigurationData();
+				try {
+					removeData(des, data, null);
+				} catch (CoreException e) {
+				}
+			}
+		}
+	}
+
+	public ICConfigurationDescription getPreferenceConfiguration(String buildSystemId) throws CoreException {
+		return getPreferenceConfiguration(buildSystemId, true);
+	}
+
+	private void runContextOperations(SettingsContext context, IProgressMonitor monitor){
+		IWorkspaceRunnable toRun = context.createOperationRunnable();
+		if(toRun != null){
+			runWspModification(toRun, monitor);
+		} else if (monitor != null){
+			monitor.done();
+		}
+	}
+
+	public ICConfigurationDescription getPreferenceConfiguration(String buildSystemId, boolean write) throws CoreException {
+		ICConfigurationDescription des = getLoaddedPreference(buildSystemId);
+		if(des == null){
+			try {
+				des = loadPreference(buildSystemId);
+			} catch (CoreException e) {
+	//			CCorePlugin.log(e);
+			}
+
+			if(des == null){
+				try {
+					des = createNewPreference(buildSystemId);
+				} catch (CoreException e) {
+					CCorePlugin.log(e);
+				}
+			}
+
+			setLoaddedPreference(buildSystemId, (CConfigurationDescriptionCache)des);
+		}
+		if(des != null && write){
+			try {
+				des = createWritablePreference((CConfigurationDescriptionCache)des);
+			} catch (CoreException e) {
+				CCorePlugin.log(e);
+			}
+		}
+		return des;
+	}
+
+	public void setPreferenceConfiguration(String buildSystemId, ICConfigurationDescription des) throws CoreException{
+		if(!needSavePreference(buildSystemId, des))
+			return;
+
+		CConfigurationDescriptionCache cache = createPreferenceCache(des);
+
+		savePreferenceConfiguration(buildSystemId, cache);
+
+		setLoaddedPreference(buildSystemId, cache);
+	}
+
+	private void savePreferenceConfiguration(String buildStystemId, CConfigurationDescriptionCache cache) throws CoreException{
+		ICStorageElement el = cache.getSpecSettings().getRootStorageElement();
+		saveBuildSystemConfigPreferenceStorage(buildStystemId, el);
+	}
+
+	private void saveBuildSystemConfigPreferenceStorage(String buildSystemId, ICStorageElement el) throws CoreException{
+		ICStorageElement cur = getBuildSystemConfigPreferenceStorage(buildSystemId);
+		ICStorageElement parent = cur.getParent();
+		parent.removeChild(cur);
+		parent.importChild(el);
+		savePreferenceStorage(PREFERENCES_STORAGE, MODULE_ID, parent);
+	}
+
+	private boolean needSavePreference(String buildSystemId, ICConfigurationDescription des){
+		if(des.isModified()
+				|| !des.isPreferenceConfiguration()
+				|| !des.getBuildSystemId().equals(buildSystemId))
+			return true;
+
+		return false;
+	}
+
+	private ICConfigurationDescription createWritablePreference(CConfigurationDescriptionCache cache) throws CoreException{
+		return new CConfigurationDescription(cache, fPrefUpdater);
+	}
+
+	private CConfigurationDescriptionCache createPreferenceCache(ICConfigurationDescription des) throws CoreException{
+		IInternalCCfgInfo cfgDes = (IInternalCCfgInfo)des;
+		CConfigurationData baseData = cfgDes.getConfigurationData(false);
+		CConfigurationDescriptionCache baseCache = null;
+		if(baseData instanceof CConfigurationDescriptionCache){
+			baseCache = (CConfigurationDescriptionCache)baseData;
+			baseData = baseCache.getConfigurationData();
+		}
+		CConfigurationSpecSettings settings = cfgDes.getSpecSettings();
+		ICStorageElement rootEl = getBuildSystemConfigPreferenceStorage(des.getBuildSystemId(), true, false);
+		ICStorageElement rootParent = rootEl.getParent();
+		rootParent.removeChild(rootEl);
+		ICStorageElement baseRootEl = settings.getRootStorageElement();
+		rootEl = rootParent.importChild(baseRootEl);
+		CConfigurationDescriptionCache cache = new CConfigurationDescriptionCache(des, baseData, baseCache, cfgDes.getSpecSettings(), null, rootEl);
+		CSettingEntryFactory factory = new CSettingEntryFactory();
+		SettingsContext context = new SettingsContext(null);
+		cache.applyData(factory, context);
+		cache.doneInitialization();
+		factory.clear();
+		runContextOperations(context, null);
+		return cache;
+	}
+
+	private ICConfigurationDescription createNewPreference(String buildSystemId) throws CoreException {
+		ICStorageElement cfgEl = getBuildSystemConfigPreferenceStorage(buildSystemId, true, false);
+
+		String id = PREFERENCE_CFG_ID_PREFIX + buildSystemId;
+		CConfigurationDescription des = new CConfigurationDescription(id, PREFERENCE_CFG_NAME, buildSystemId, cfgEl, fPrefUpdater);
+
+		return createPreferenceCache(des);
+	}
+
+//	private XmlStorage createBuildSystemCfgPrefStore() throws CoreException{
+//		ICStorageElement el = getPreferenceStorage(PREFERENCES_STORAGE, MODULE_ID, true, false);
+//
+//		XmlStorage store = new XmlStorage((InternalXmlStorageElement)el);
+//
+//		return store;
+//	}
+//
+//	ICSettingsStorage getBuildSystemCfgPrefStore() throws CoreException{
+//		if(fPrefCfgStorage == null){
+//			fPrefCfgStorage = createBuildSystemCfgPrefStore();
+//		}
+//
+//		return copyStorage(fPrefCfgStorage, false);
+//	}
+
+	ICStorageElement getBuildSystemConfigPreferenceStorage(String buildSystemId) throws CoreException{
+		return getBuildSystemConfigPreferenceStorage(buildSystemId, true, false);
+	}
+
+	private ICStorageElement getBuildSystemConfigPreferenceStorage(String buildSystemId, boolean createIfNotDound, boolean readOnly) throws CoreException{
+		ICStorageElement el = getPreferenceStorage(PREFERENCES_STORAGE, MODULE_ID, createIfNotDound, readOnly);
+		ICStorageElement cfgEl = null;
+
+		if(el != null){
+			ICStorageElement children[] = el.getChildren();
+			for(int i = 0; i < children.length; i++){
+				ICStorageElement child = children[i];
+				if(PREFERENCE_BUILD_SYSTEM_ELEMENT.equals(child.getName())){
+					if(buildSystemId.equals(child.getAttribute(ID))){
+						cfgEl = child;
+						break;
+					}
+				}
+
+			}
+
+			if(cfgEl == null){
+				cfgEl = el.createChild(PREFERENCE_BUILD_SYSTEM_ELEMENT);
+				cfgEl.setAttribute(ID, buildSystemId);
+			}
+
+		}
+
+		return cfgEl;
+	}
+
+	private ICConfigurationDescription loadPreference(String buildSystemId) throws CoreException{
+		ICStorageElement el = getPreferenceStorage(PREFERENCES_STORAGE, MODULE_ID, false, false);
+
+		ICStorageElement children[] = el.getChildren();
+		ICStorageElement cfgEl = null;
+		for(int i = 0; i < children.length; i++){
+			ICStorageElement child = children[i];
+			if(PREFERENCE_BUILD_SYSTEM_ELEMENT.equals(child.getName())){
+				if(buildSystemId.equals(child.getAttribute(ID))){
+					cfgEl = child;
+					break;
+				}
+			}
+
+		}
+		CConfigurationDescriptionCache cache = new CConfigurationDescriptionCache(cfgEl, null);
+		CSettingEntryFactory factory = new CSettingEntryFactory();
+		cache.loadData(factory);
+		cache.doneInitialization();
+		factory.clear();
+		return cache;
+	}
+
+	public ICStorageElement getPreferenceStorage(String prefKey, String storageId, boolean createIfNotDound, boolean readOnly) throws CoreException{
+		XmlStorage store = getPreferenceStore(prefKey, createIfNotDound, readOnly);
+
+		return store.getStorage(storageId, createIfNotDound);
+	}
+
+	private XmlStorage getPreferenceStore(String prefKey,  boolean createIfNotDound, boolean readOnly) throws CoreException{
+		ICStorageElement el = createPreferenceStorage(prefKey, createIfNotDound, readOnly);
+
+		XmlStorage store = new XmlStorage((InternalXmlStorageElement)el);
+
+		return store;
+	}
+
+	public void savePreferenceStorage(String prefKey, String storageId, ICStorageElement el) throws CoreException{
+		XmlStorage store = getPreferenceStore(prefKey, true, false);
+		store.importStorage(storageId, el);
+
+		InternalXmlStorageElement rootEl = new InternalXmlStorageElement(store.fElement, store.isReadOnly());
+		serializePreference(prefKey, rootEl);
+	}
+
+	private CConfigurationDescriptionCache getLoaddedPreference(String buildSystemId){
+		return fPreferenceMap.get(buildSystemId);
+	}
+
+	private void setLoaddedPreference(String buildSystemId, CConfigurationDescriptionCache des){
+		fPreferenceMap.put(buildSystemId, des);
+	}
+
+	public CConfigBasedDescriptorManager getDescriptorManager(){
+		return fDescriptorManager;
+	}
+
+	public CConfigurationData createDefaultConfigData(IProject project, CDataFactory factory) throws CoreException{
+		return createDefaultConfigData(project, CDataUtil.genId(DEFAULT_CFG_ID_PREFIX), DEFAULT_CFG_NAME, factory);
+	}
+
+	public CConfigurationData createDefaultConfigData(IProject project, String id, String name, CDataFactory factory) throws CoreException{
+		if(factory == null)
+			factory = new CDataFactory();
+
+		CConfigurationData data = CDataUtil.createEmptyData(id, name, factory, true);
+//		CDataUtil.
+////		data.initEmptyData();
+//
+//		CDataUtil.adjustConfig(data, factory);
+
+		factory.setModified(data, false);
+		return data;
+	}
+
+	public boolean isNewStyleIndexCfg(IProject project){
+		ICProjectDescription des = getProjectDescription(project, false);
+		if(des != null)
+			return isNewStyleIndexCfg(des);
+		return false;
+	}
+
+	public boolean isNewStyleIndexCfg(ICProjectDescription des){
+		ICConfigurationDescription cfgDes = des.getDefaultSettingConfiguration();
+		if(cfgDes != null)
+			return isNewStyleCfg(cfgDes);
+		return false;
+	}
+
+	public boolean isNewStyleProject(IProject project){
+		return isNewStyleProject(getProjectDescription(project, false));
+	}
+
+	public boolean isNewStyleProject(ICProjectDescription des){
+		if(des == null)
+			return false;
+
+		return isNewStyleIndexCfg(des);
+	}
+
+	public boolean isNewStyleCfg(ICConfigurationDescription cfgDes){
+		if(cfgDes == null)
+			return false;
+
+		CConfigurationData data = ((IInternalCCfgInfo)cfgDes).getConfigurationData(false);
+		if(data instanceof CConfigurationDescriptionCache){
+			data = ((CConfigurationDescriptionCache)data).getConfigurationData();
+		}
+
+		return data != null && !PathEntryConfigurationDataProvider.isPathEntryData(data);
+	}
+
+//	public String[] getContentTypeFileSpecs (IProject project, IContentType type) {
+//		String[] globalSpecs = type.getFileSpecs(IContentType.FILE_EXTENSION_SPEC);
+//		IContentTypeSettings settings = null;
+//		if (project != null) {
+//			IScopeContext projectScope = new ProjectScope(project);
+//			try {
+//				settings = type.getSettings(projectScope);
+//			} catch (Exception e) {}
+//			if (settings != null) {
+//				String[] specs = settings.getFileSpecs(IContentType.FILE_EXTENSION_SPEC);
+//				if (specs.length > 0) {
+//					int total = globalSpecs.length + specs.length;
+//					String[] projSpecs = new String[total];
+//					int i=0;
+//					for (int j=0; j<specs.length; j++) {
+//						projSpecs[i] = specs[j];
+//						i++;
+//					}
+//					for (int j=0; j<globalSpecs.length; j++) {
+//						projSpecs[i] = globalSpecs[j];
+//						i++;
+//					}
+//					return projSpecs;
+//				}
+//			}
+//		}
+//		return globalSpecs;
+//	}
+
+//	public String[] getExtensionsFromContentTypes(IProject project, String[] typeIds){
+//		return CDataUtil.getExtensionsFromContentTypes(project, typeIds);
+//	}
+
+	static ICLanguageSetting getLanguageSettingForFile(ICConfigurationDescription cfgDes, IPath path, boolean ignoreExcludeStatus){
+		int segCount = path.segmentCount();
+		if(segCount == 0)
+			return null;
+
+		ICResourceDescription rcDes = cfgDes.getResourceDescription(path, false);
+		if(rcDes == null || (!ignoreExcludeStatus && rcDes.isExcluded()))
+			return null;
+
+		if(rcDes.getType() == ICSettingBase.SETTING_FOLDER){
+			return ((ICFolderDescription)rcDes).getLanguageSettingForFile(path.lastSegment());
+		}
+		return ((ICFileDescription)rcDes).getLanguageSetting();
+	}
+
+	static private HashMap<HashSet<String>, CLanguageData> createExtSetToLDataMap(IProject project, CLanguageData[] lDatas){
+		HashMap<HashSet<String>, CLanguageData> map = new HashMap<HashSet<String>, CLanguageData>();
+
+		for(int i = 0; i < lDatas.length; i++){
+			CLanguageData lData = lDatas[i];
+			String[] exts = CDataUtil.getSourceExtensions(project, lData);
+			HashSet<String> set = new HashSet<String>(Arrays.asList(exts));
+			map.put(set, lData);
+		}
+
+		return map;
+	}
+
+	static boolean removeNonCustomSettings(IProject project, CConfigurationData data){
+		PathSettingsContainer cr = CDataUtil.createRcDataHolder(data);
+		PathSettingsContainer[] crs = cr.getChildren(false);
+		PathSettingsContainer child, parent;
+		CResourceData childRcData;
+		boolean modified = false;
+		for(int i = 0; i < crs.length; i++){
+			child = crs[i];
+			childRcData = (CResourceData)child.getValue();
+			if(childRcData.getType() == ICSettingBase.SETTING_FOLDER){
+				CResourceData parentRcData = null;
+				for(parent = child.getParentContainer();
+					(parentRcData = (CResourceData)parent.getValue()).getType() != ICSettingBase.SETTING_FOLDER;
+					parent = parent.getParentContainer());
+				if(!settingsCustomized(project, (CFolderData)parentRcData, (CFolderData)childRcData)){
+					try {
+						data.removeResourceData(childRcData);
+						child.remove();
+						modified = true;
+					} catch (CoreException e) {
+						CCorePlugin.log(e);
+					}
+				}
+			} else {
+				parent = child.getParentContainer();
+				if(!settingsCustomized(project, (CResourceData)parent.getValue(), (CFileData)childRcData)){
+					try {
+						data.removeResourceData(childRcData);
+						child.remove();
+						modified = true;
+					} catch (CoreException e) {
+						CCorePlugin.log(e);
+					}
+				}
+			}
+
+		}
+		return modified;
+	}
+
+	static boolean settingsCustomized(IProject project, CFolderData parent, CFolderData child){
+		if(baseSettingsCustomized(parent, child))
+			return true;
+
+		CLanguageData[] childLDatas = child.getLanguageDatas();
+		CLanguageData[] parentLDatas = parent.getLanguageDatas();
+
+		if(childLDatas.length != parentLDatas.length)
+			return true;
+
+		if(childLDatas.length != 0){
+			HashMap<HashSet<String>, CLanguageData> parentMap = createExtSetToLDataMap(project, parentLDatas);
+			HashMap<HashSet<String>, CLanguageData> childMap = createExtSetToLDataMap(project, childLDatas);
+			CLanguageData parentLData, childLData;
+			for(Iterator iter = parentMap.entrySet().iterator(); iter.hasNext();){
+				Map.Entry entry = (Map.Entry)iter.next();
+				childLData = childMap.get(entry.getKey());
+				if(childLData == null)
+					return true;
+
+				parentLData = (CLanguageData)entry.getValue();
+				if(!langDatasEqual(parentLData, childLData))
+					return true;
+			}
+		}
+
+		return false;
+	}
+
+	static boolean settingsCustomized(IProject project, CResourceData parent, CFileData child){
+		if(baseSettingsCustomized(parent, child))
+			return true;
+
+		CLanguageData lData = child.getLanguageData();
+
+		if(parent.getType() == ICSettingBase.SETTING_FOLDER){
+			CFolderData foParent = (CFolderData)parent;
+
+			IPath childPath = child.getPath();
+			String fileName = childPath.lastSegment();
+			if(PatternNameMap.isPatternName(fileName))
+				return true;
+
+			CLanguageData parentLangData = CDataUtil.findLanguagDataForFile(fileName, project, foParent);
+
+			return !langDatasEqual(lData, parentLangData);
+		}
+
+		CFileData fiParent = (CFileData)parent;
+		CLanguageData parentLangData = fiParent.getLanguageData();
+		return !langDatasEqual(lData, parentLangData);
+	}
+
+	static boolean langDatasEqual(CLanguageData lData1, CLanguageData lData2){
+		if(lData1 == null)
+			return lData2 == null;
+
+		if(lData2 == null)
+			return false;
+
+		int kinds[] = KindBasedStore.getLanguageEntryKinds();
+		int kind;
+		for(int i = 0; i < kinds.length; i++){
+			kind = kinds[i];
+			ICLanguageSettingEntry entries1[] = lData1.getEntries(kind);
+			ICLanguageSettingEntry entries2[] = lData2.getEntries(kind);
+			if(!Arrays.equals(entries1, entries2))
+				return false;
+		}
+
+		return true;
+	}
+
+	private static boolean baseSettingsCustomized(CResourceData parent, CResourceData child){
+//		if(parent.isExcluded() != child.isExcluded())
+//			return true;
+
+		if(child.hasCustomSettings())
+			return true;
+
+		return false;
+	}
+
+
+	public ICProjectDescriptionWorkspacePreferences getProjectDescriptionWorkspacePreferences(
+			boolean write) {
+		if(fPreferences == null){
+			try {
+				fPreferences = loadPreferences();
+			} catch (CoreException e) {
+			}
+			if(fPreferences == null)
+				fPreferences = new CProjectDescriptionWorkspacePreferences((ICStorageElement)null, null, true);
+		}
+
+		CProjectDescriptionWorkspacePreferences prefs = fPreferences;
+
+		if(write)
+			prefs = new CProjectDescriptionWorkspacePreferences(prefs, false);
+
+		return prefs;
+	}
+
+	public boolean setProjectDescriptionWorkspacePreferences(ICProjectDescriptionWorkspacePreferences prefs,
+						boolean updateProjects,
+						IProgressMonitor monitor) {
+		if(monitor == null)
+			monitor = new NullProgressMonitor();
+		boolean changed = false;
+		ICProjectDescriptionWorkspacePreferences oldPrefs = getProjectDescriptionWorkspacePreferences(false);
+		try {
+			do {
+				if(oldPrefs != prefs){
+					if(prefs.getConfigurationRelations() != oldPrefs.getConfigurationRelations()){
+						changed = true;
+						break;
+					}
+				}
+			} while(false);
+
+			if(changed){
+				CProjectDescriptionWorkspacePreferences basePrefs;
+				if(prefs instanceof CProjectDescriptionWorkspacePreferences)
+					basePrefs = (CProjectDescriptionWorkspacePreferences)prefs;
+				else
+					throw new IllegalArgumentException();
+
+				fPreferences = new CProjectDescriptionWorkspacePreferences(basePrefs, null, true);
+
+				storePreferences(fPreferences);
+
+				if(updateProjects)
+					updateProjectDescriptions(null, monitor);
+			}
+		} catch (CoreException e) {
+			CCorePlugin.log(e);
+		} finally {
+			monitor.done();
+		}
+
+		return changed;
+	}
+
+	private void storePreferences(CProjectDescriptionWorkspacePreferences prefs) throws CoreException {
+		ICStorageElement el = getCProjectDescriptionPreferencesElement(true, false);
+		prefs.serialize(el);
+		saveCProjectDescriptionPreferencesElement(el);
+	}
+
+	private void saveCProjectDescriptionPreferencesElement(ICStorageElement el) throws CoreException{
+		ICStorageElement cur = getCProjectDescriptionPreferencesElement(true, false);
+		ICStorageElement parent = cur.getParent();
+		parent.removeChild(cur);
+		parent.importChild(el);
+		savePreferenceStorage(PREFERENCES_STORAGE, MODULE_ID, parent);
+	}
+
+	private CProjectDescriptionWorkspacePreferences loadPreferences() throws CoreException{
+		ICStorageElement el = getCProjectDescriptionPreferencesElement(false, true);
+		return new CProjectDescriptionWorkspacePreferences(el, null, true);
+	}
+
+	private ICStorageElement getCProjectDescriptionPreferencesElement(boolean createIfNotFound, boolean readOnly) throws CoreException{
+		ICStorageElement el = getPreferenceStorage(PREFERENCES_STORAGE, MODULE_ID, createIfNotFound, readOnly);
+		ICStorageElement[] children = el.getChildren();
+		for(int i = 0; i < children.length; i++){
+			if(PREFERENCES_ELEMENT.equals(children[i].getName()))
+				return children[i];
+		}
+		if(createIfNotFound)
+			return el.createChild(PREFERENCES_ELEMENT);
+		throw ExceptionFactory.createCoreException(SettingsModelMessages.getString("CProjectDescriptionManager.14")); //$NON-NLS-1$
+	}
+
+	public void updateExternalSettingsProviders(String[] ids, IProgressMonitor monitor){
+		ExtensionContainerFactory.updateReferencedProviderIds(ids, monitor);
+	}
+
+	boolean isEmptyCreatingDescriptionAllowed(){
+		return fAllowEmptyCreatingDescription;
+	}
+
+	void setEmptyCreatingDescriptionAllowed(boolean allow){
+		fAllowEmptyCreatingDescription = allow;
+	}
+
+}