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package org.eclipse.cdt.internal.ui.util;
/*
* (c) Copyright IBM Corp. 2000, 2001.
* All Rights Reserved.
*/
import java.util.HashMap;
import java.util.Iterator;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Display;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.util.Assert;
/**
* 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(SWTUtil.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 diaplay the display the images managed by this registry are allocated for
*/
public ImageDescriptorRegistry(Display display) {
fDisplay= display;
Assert.isNotNull(fDisplay);
hookDisplay();
}
/**
* Returns the image assiciated 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 == SWTUtil.getStandardDisplay(), "Allocating image for wrong display."); //$NON-NLS-1$
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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