--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.symbian.tools.wrttools.previewer/src/org/symbian/tools/tmw/previewer/internal/PreviewerUtil.java	Thu Aug 19 16:13:44 2010 -0700
@@ -0,0 +1,99 @@
+/**
+ * Copyright (c) 2010 Symbian Foundation and/or its subsidiary(-ies).
+ * All rights reserved.
+ * This component and the accompanying materials are made available
+ * under the terms of the License "Eclipse Public License v1.0"
+ * which accompanies this distribution, and is available
+ * at the URL "http://www.eclipse.org/legal/epl-v10.html".
+ *
+ * Initial Contributors:
+ * Symbian Foundation - initial contribution.
+ * Contributors:
+ * Description:
+ * Overview:
+ * Details:
+ * Platforms/Drives/Compatibility:
+ * Assumptions/Requirement/Pre-requisites:
+ * Failures and causes:
+ */
+package org.symbian.tools.tmw.previewer.internal;
+
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+
+import org.eclipse.core.resources.IFile;
+import org.eclipse.core.resources.IProject;
+import org.eclipse.core.resources.IResource;
+import org.eclipse.core.resources.IResourceDelta;
+import org.eclipse.core.resources.IResourceDeltaVisitor;
+import org.eclipse.core.runtime.CoreException;
+import org.eclipse.core.runtime.IPath;
+import org.symbian.tools.tmw.previewer.core.IApplicationLayoutProvider;
+import org.symbian.tools.wrttools.previewer.PreviewerPlugin;
+
+public class PreviewerUtil {
+    public static final class ChangedResourcesCollector implements IResourceDeltaVisitor {
+        public final Collection<IFile> files = new HashSet<IFile>();
+        public final Collection<IProject> deleted = new HashSet<IProject>();
+        public final Map<IProject, IPath> renamed = new HashMap<IProject, IPath>();
+
+        public boolean visit(IResourceDelta delta) throws CoreException {
+            IResource resource = delta.getResource();
+            switch (resource.getType()) {
+            case IResource.PROJECT:
+                if (delta.getKind() == IResourceDelta.REMOVED) {
+                    if ((delta.getFlags() & IResourceDelta.MOVED_TO) != 0) {
+                        renamed.put(resource.getProject(), delta.getMovedToPath());
+                    } else {
+                        deleted.add((IProject) resource);
+                    }
+                    return false;
+                }
+                break;
+            case IResource.FILE:
+                IApplicationLayoutProvider layoutProvider = PreviewerPlugin.getExtensionsManager().getLayoutProvider(
+                        resource.getProject());
+                if (layoutProvider != null) {
+                    if (layoutProvider.getResourcePath((IFile) resource) != null) {
+                        final boolean kind = delta.getKind() == IResourceDelta.ADDED
+                                | delta.getKind() == IResourceDelta.REMOVED;
+                        final boolean flag = (delta.getFlags() & (IResourceDelta.CONTENT | IResourceDelta.ENCODING
+                                | IResourceDelta.LOCAL_CHANGED | IResourceDelta.REPLACED | IResourceDelta.SYNC)) != 0;
+                        if (kind || flag) {
+                            files.add((IFile) resource);
+                        }
+                    }
+                }
+                break;
+            }
+            return true;
+        }
+    }
+
+    public static boolean isRelevantResource(IResource resource) {
+        if (resource.exists() && resource.getType() == IResource.FILE) {
+            return !resource.getFullPath().segment(1).equalsIgnoreCase("preview")
+                    && !"wgz".equalsIgnoreCase(resource.getFileExtension())
+                    && !(PreviewerPlugin.PLUGIN_ID + ".xml").equals(resource.getName());
+        }
+        return false;
+    }
+
+    public static IFile[] getWebChanges(final IResourceDelta delta) {
+        ChangedResourcesCollector visitor = collectResourceChanges(delta);
+        final Collection<IFile> files = visitor.files;
+        return files.toArray(new IFile[files.size()]);
+    }
+
+    public static ChangedResourcesCollector collectResourceChanges(final IResourceDelta delta) {
+        ChangedResourcesCollector visitor = new ChangedResourcesCollector();
+        try {
+            delta.accept(visitor);
+        } catch (CoreException e) {
+            PreviewerPlugin.log(e);
+        }
+        return visitor;
+    }
+}