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/*******************************************************************************
* Copyright (c) 2008, 2009 Angelo Zerr 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:
* Angelo Zerr <angelo.zerr@gmail.com> - initial API and implementation
* IBM Corporation
*******************************************************************************/
package org.eclipse.e4.ui.css.swt.resources;
import org.eclipse.e4.ui.css.core.resources.AbstractResourcesRegistry;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Cursor;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
/**
* SWT Resources Registry to cache SWT Resource like Color, Cursor and Font and
* dispose it.
*/
public class SWTResourcesRegistry extends AbstractResourcesRegistry {
public SWTResourcesRegistry(Display display) {
if (display == null)
return;
// When SWT Display will dispose, all SWT resources stored
// into cache will be dispose it too.
display.addListener(SWT.Dispose, new Listener() {
public void handleEvent(Event event) {
dispose();
}
});
}
public Object getResource(Object type, Object key) {
Object resource = super.getResource(type, key);
if (resource != null) {
// test if resource is disposed
if (isDisposed(resource)) {
// SWT Resource is disposed
// unregister it.
super.unregisterResource(resource);
return null;
}
}
return resource;
}
/*
* (non-Javadoc)
*
* @see org.eclipse.e4.ui.core.css.resources.AbstractResourcesRegistry#registerResource(java.lang.String,
* java.lang.Object, java.lang.Object)
*/
public void registerResource(Object type, Object key, Object resource) {
if (resource == null)
return;
// String hit = getResource(type, key) != null
// ? " hit "
// : " ";
//TODO replace with eclipse logging
// if (resource instanceof Color) {
// System.out.println("key class = " + key.getClass());
// System.out.println("Cache " + hit + "SWT Color key= " + key);
// } else if (resource instanceof Cursor) {
// System.out.println("Cache" + hit + "SWT Cursor key=" + key);
// } else if (resource instanceof Font) {
// System.out.println("Cache" + hit + "SWT Font key=" + key);
// } else if (resource instanceof Image) {
// System.out.println("Cache" + hit + "SWT Image key=" + key);
// } else
// System.out.println("Cache" + hit + "Resource key=" + key);
super.registerResource(type, key, resource);
}
/*
* (non-Javadoc)
*
* @see org.eclipse.e4.ui.core.css.resources.AbstractResourcesRegistry#disposeResource(java.lang.Object,
* java.lang.String, java.lang.Object)
*/
public void disposeResource(Object type, String key, Object resource) {
// Dispose SWT Resource
if (resource instanceof Color) {
((Color)resource).dispose();
//TODO replace with eclipse logging
// if (logger.isDebugEnabled())
// logger.debug("Dispose SWT Color key=" + key);
} else if (resource instanceof Cursor) {
((Cursor)resource).dispose();
//TODO replace with eclipse logging
// if (logger.isDebugEnabled())
// logger.debug("Dispose SWT Cursor key=" + key);
} else if (resource instanceof Font) {
((Font)resource).dispose();
//TODO replace with eclipse logging
// if (logger.isDebugEnabled())
// logger.debug("Dispose SWT Font key=" + key);
} else if (resource instanceof Image) {
((Image) resource).dispose();
//TODO replace with eclipse logging
// if (logger.isDebugEnabled())
// logger.debug("Dispose SWT Image key=" + key);
}
//TODO replace with eclipse logging
// else if (logger.isDebugEnabled())
// logger.debug("Dispose Resource key=" + key);
}
protected boolean isDisposed(Object resource) {
if (resource instanceof Color) {
return ((Color) resource).isDisposed();
} else if (resource instanceof Font) {
return ((Font) resource).isDisposed();
} else if (resource instanceof Image) {
return ((Image) resource).isDisposed();
} else if (resource instanceof Cursor) {
return ((Cursor) resource).isDisposed();
}
return false;
}
}
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