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/*******************************************************************************
* Copyright (c) 2000, 2005 IBM 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.ui.externaltools.internal.model;
import java.util.HashMap;
import java.util.Iterator;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.util.Assert;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Display;
/**
* A registry that maps <code>ImageDescriptors</code> to <code>Image</code>.
*/
public class ImageDescriptorRegistry {
private HashMap fRegistry= new HashMap(10);
private Display fDisplay;
/**
* Creates a new image descriptor registry for the current or default display,
* respectively.
*/
public ImageDescriptorRegistry() {
this(ExternalToolsPlugin.getStandardDisplay());
}
/**
* Creates a new image descriptor registry for the given display. All images
* managed by this registry will be disposed when the display gets disposed.
*
* @param display the display the images managed by this registry are allocated for
*/
public ImageDescriptorRegistry(Display display) {
fDisplay= display;
Assert.isNotNull(fDisplay);
hookDisplay();
}
/**
* Returns the image associated with the given image descriptor.
*
* @param descriptor the image descriptor for which the registry manages an image
* @return the image associated with the image descriptor or <code>null</code>
* if the image descriptor can't create the requested image.
*/
public Image get(ImageDescriptor descriptor) {
if (descriptor == null)
descriptor= ImageDescriptor.getMissingImageDescriptor();
Image result= (Image)fRegistry.get(descriptor);
if (result != null)
return result;
Assert.isTrue(fDisplay == ExternalToolsPlugin.getStandardDisplay(), ExternalToolsModelMessages.getString("ImageDescriptorRegistry.Allocating_image_for_wrong_display_1")); //$NON-NLS-1$
result= descriptor.createImage();
if (result != null)
fRegistry.put(descriptor, result);
return result;
}
/**
* Disposes all images managed by this registry.
*/
public void dispose() {
for (Iterator iter= fRegistry.values().iterator(); iter.hasNext(); ) {
Image image= (Image)iter.next();
image.dispose();
}
fRegistry.clear();
}
private void hookDisplay() {
fDisplay.disposeExec(new Runnable() {
public void run() {
dispose();
}
});
}
}
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