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/*******************************************************************************
* Copyright (c) 2004 QNX Software Systems 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:
* QNX Software Systems - Initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.debug.internal.ui;
import java.util.HashMap;
import java.util.Iterator;
import org.eclipse.cdt.debug.ui.CDebugUIPlugin;
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 CDebugImageDescriptorRegistry {
private HashMap fRegistry = new HashMap( 10 );
private Display fDisplay;
/**
* Creates a new image descriptor registry for the current or default display, respectively.
*/
public CDebugImageDescriptorRegistry() {
this( CDebugUIPlugin.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 CDebugImageDescriptorRegistry( 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 == CDebugUIPlugin.getStandardDisplay(), CDebugUIMessages.getString( "CDebugImageDescriptorRegistry.0" ) ); //$NON-NLS-1$
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.asyncExec( new Runnable() {
public void run() {
getDisplay().disposeExec( new Runnable() {
public void run() {
dispose();
}
} );
}
} );
}
protected Display getDisplay() {
return fDisplay;
}
}
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