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/***************************************************************************************************
* Copyright (c) 2003, 2004 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.wst.common.internal.emf.resource;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
public abstract class RendererFactory {
public abstract Renderer createRenderer();
private static RendererFactory defaultRendererFactory;
private static RendererFactoryDefaultHandler defaultHandler;
private boolean validating = true;
/**
* Interested parties can use the
*/
public final static Notifier NotificationEngine = Notifier.INSTANCE;
/**
* @return
*/
public static RendererFactory getDefaultRendererFactory() {
if (defaultRendererFactory == null)
defaultRendererFactory = getDefaultHandler().getDefaultRendererFactory();
return defaultRendererFactory;
}
/**
* @param factory
*/
public static void setDefaultRendererFactory(RendererFactory factory) {
//System.out.println("\n\n***Setting factory: " + factory);
NotificationEngine.notifyListeners(factory);
defaultRendererFactory = factory;
}
public String toString() {
return "RendererFactory instance: " + getClass().getName(); //$NON-NLS-1$
}
public static class Notifier {
private static final Notifier INSTANCE = new Notifier();
private final Collection resourceFactoryListeners = new ArrayList();
private Notifier() {
}
public void notifyListeners(RendererFactory rendererFactory) {
final int length = resourceFactoryListeners.size();
//System.out.println("Notifying " + length + " listeners");
if (length > 0) {
/*
* Since the renderer factories are singletons, this reference check should always
* work
*/
if (rendererFactory != RendererFactory.getDefaultRendererFactory()) {
WeakReference wref = null;
Listener listener = null;
synchronized (resourceFactoryListeners) {
for (Iterator i = resourceFactoryListeners.iterator(); i.hasNext();) {
wref = (WeakReference) i.next();
listener = (Listener) wref.get();
//System.out.println("Notifying Listener: " + listener);
if (listener != null)
listener.updateRendererFactory(rendererFactory);
else
i.remove();
}
}
}
}
}
public void addListener(Listener l) {
//System.out.println("Adding listener: " + l);
synchronized (resourceFactoryListeners) {
resourceFactoryListeners.add(new WeakReference(l));
}
}
public void removeListener(Listener listenerToRemove) {
final int length = resourceFactoryListeners.size();
if (length > 0) {
WeakReference wref = null;
Listener listener = null;
synchronized (resourceFactoryListeners) {
for (Iterator i = resourceFactoryListeners.iterator(); i.hasNext();) {
wref = (WeakReference) i.next();
listener = (Listener) wref.get();
if (listener != null) {
if (listener == listenerToRemove) {
i.remove();
break;
}
} else {
i.remove();
}
}
}
}
}
}
public interface Listener {
void updateRendererFactory(RendererFactory newRendererFactory);
}
/**
* @return
*/
public boolean isValidating() {
return validating;
}
/**
* @param b
*/
public void setValidating(boolean b) {
validating = b;
}
/**
* @return
*/
public static RendererFactoryDefaultHandler getDefaultHandler() {
if (defaultHandler == null)
defaultHandler = EMF2DOMRendererFactoryDefaultHandler.INSTANCE;
return defaultHandler;
}
/**
* @param handler
*/
public static void setDefaultHandler(RendererFactoryDefaultHandler handler) {
defaultHandler = handler;
}
}
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