/*

* Copyright (c) 2006-2009 Nokia Corporation 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:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description: 

*

*/

package com.nokia.carbide.internal.cpp.epoc.engine.model;

import com.nokia.carbide.cpp.epoc.engine.EpocEnginePlugin;

import com.nokia.carbide.cpp.epoc.engine.model.IModelFactory;

import com.nokia.cpp.internal.api.utils.core.*;

import org.eclipse.core.runtime.*;

import java.io.File;

import java.io.IOException;

import java.util.HashMap;

import java.util.Map;

/**

 * This is the model provider implementation that works on java.io.File.

 * <p>

 * All paths are full paths.

 * <p>

 * It does not track changes to files.  

 * <p>

 * Do not use it when talking to workspace resources, or else the workspace

 * will become out of sync.

 *

 */

public class StandaloneModelProvider<Model, SharedModel> extends ModelProviderBase {

	private Map<IPath, Long> externalFileModDateMap;

	public StandaloneModelProvider(IModelFactory modelFactory) {

		super(modelFactory);

		this.externalFileModDateMap = new HashMap<IPath, Long>();

	}

	/* (non-Javadoc)

	 * @see com.nokia.carbide.internal.cpp.epoc.engine.model.ModelProviderBase#getCanonicalPath(org.eclipse.core.runtime.IPath)

	 */

	@Override

	protected IPath getFullPath(IPath path) {

		File file = path.toFile();

		try {

			file = file.getCanonicalFile();

		} catch (IOException e) {

			EpocEnginePlugin.log(e);

		}

		return new Path(file.getAbsolutePath());

	}

	/* (non-Javadoc)

	 * @see com.nokia.carbide.internal.cpp.epoc.engine.model.ModelProviderBase#loadDocument(org.eclipse.core.runtime.IPath)

	 */

	@Override

	protected String loadStorage(IPath path) throws CoreException {

		File file = path.toFile();

		if (file != null && file.exists()) {

			externalFileModDateMap.put(path, file.lastModified());

			char[] text = FileUtils.readFileContents(file, null);

			return new String(text);

		} else {

			return null;

		}

	}

	/* (non-Javadoc)

	 * @see com.nokia.carbide.internal.cpp.epoc.engine.model.ModelProviderBase#saveDocument(org.eclipse.core.runtime.IPath, org.eclipse.jface.text.IDocument)

	 */

	@Override

	protected void saveStorage(IPath path, String text)

			throws CoreException {

		File file = path.toFile();

		if (file != null) {

			char[] chars = text.toCharArray();

			FileUtils.writeFileContents(file, chars, null);

			externalFileModDateMap.put(path, file.lastModified());

		}

	}

	/* (non-Javadoc)

	 * @see com.nokia.carbide.internal.cpp.epoc.engine.model.ModelProviderBase#startTrackingStorage(org.eclipse.core.runtime.IPath)

	 */

	protected void startTrackingStorage(IPath path) {

	}

	/* (non-Javadoc)

	 * @see com.nokia.carbide.internal.cpp.epoc.engine.model.ModelProviderBase#stopTrackingStorage(org.eclipse.core.runtime.IPath)

	 */

	protected void stopTrackingStorage(IPath path) {

	}

	@Override

	protected boolean hasTrackedStorageChanged(IPath fullPath) {

		Long modDate = externalFileModDateMap.get(fullPath);

		if (modDate != null && modDate.longValue() != fullPath.toFile().lastModified())

			return true;

		return false;

	}

}