/*

* Copyright (c) 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.cpp.internal.ui.images;

import com.nokia.carbide.cpp.internal.ui.Messages;

import com.nokia.carbide.cpp.ui.CarbideUIPlugin;

import com.nokia.carbide.cpp.ui.images.IImageDataProvider;

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

import com.nokia.sdt.utils.svg.SVGLoader;

import org.eclipse.core.runtime.CoreException;

import org.eclipse.core.runtime.IStatus;

import org.eclipse.swt.graphics.ImageData;

import org.eclipse.swt.graphics.Point;

import java.io.File;

import java.lang.ref.WeakReference;

import java.text.MessageFormat;

/**

 * Implementation of a provider that takes the SVG loader and uses it to

 * generate scaled images at exact resolution.

 *

 */

public class SVGImageDataProvider extends BaseImageDataProvider implements IImageDataProvider {

	private SVGLoader loader;

	private WeakReference<ImageData> basicImageDataRef;

	public SVGImageDataProvider(File file) {

		super(file);

	}

	public ImageData getImageData(Point size) throws CoreException {

		if (loader != null) {

			if (notifyIfChanged())

				loader = null;

		}

		if (loader == null) {

			try {

				loader = loadSVG();

			} catch (Throwable t) {

				throw new CoreException(Logging.newStatus(

						CarbideUIPlugin.getDefault(), 

						IStatus.ERROR,

						MessageFormat.format(

								Messages.getString("SVGImageDataProvider.CannotLoadSVGFormat"), //$NON-NLS-1$

								new Object[] { file }),

						t));

			}

		}

		if (size == null) {

			ImageData basicImageData = null;

			if (basicImageDataRef != null) {

				basicImageData = basicImageDataRef.get();

			}

			if (basicImageData == null) {

				basicImageData = loader.getImageData(null);

				basicImageDataRef = new WeakReference<ImageData>(basicImageData);

			}

			return basicImageData;

	 	} else {

	 		return loader.getImageData(size);

	 	}

	}

	/**

	 * @return

	 */

	private SVGLoader loadSVG() {

		return new SVGLoader(file); 

	}

	/* (non-Javadoc)

	 * @see com.nokia.sdt.utils.IDisposable#dispose()

	 */

	public void dispose() {

		super.dispose();

		loader = null;

		basicImageDataRef = null;

	}

}