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/*******************************************************************************
* Copyright (c) 2000, 2008 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.core.internal.adapter;
import java.util.Iterator;
import java.util.List;
import org.eclipse.core.internal.runtime.AdapterManager;
import org.eclipse.core.internal.runtime.IAdapterManagerProvider;
import org.eclipse.core.runtime.*;
/**
* Portions of the AdapterManager that deal with the Eclipse extension registry
* were moved into this class.
*/
public final class AdapterManagerListener implements IRegistryEventListener, IAdapterManagerProvider {
public static final String ADAPTER_POINT_ID = "org.eclipse.core.runtime.adapters"; //$NON-NLS-1$
private AdapterManager theAdapterManager;
/**
* Constructs a new adapter manager.
*/
public AdapterManagerListener() {
theAdapterManager = AdapterManager.getDefault();
theAdapterManager.registerLazyFactoryProvider(this);
}
/**
* Loads adapters registered with the adapters extension point from
* the plug-in registry. Note that the actual factory implementations
* are loaded lazily as they are needed.
*/
@Override
public boolean addFactories(AdapterManager adapterManager) {
IExtensionPoint point = RegistryFactory.getRegistry().getExtensionPoint(ADAPTER_POINT_ID);
if (point == null)
return false;
boolean factoriesAdded = false;
IExtension[] extensions = point.getExtensions();
for (int i = 0; i < extensions.length; i++) {
IConfigurationElement[] elements = extensions[i].getConfigurationElements();
for (int j = 0; j < elements.length; j++) {
AdapterFactoryProxy proxy = AdapterFactoryProxy.createProxy(elements[j]);
if (proxy != null) {
adapterManager.registerFactory(proxy, proxy.getAdaptableType());
factoriesAdded = true;
}
}
}
RegistryFactory.getRegistry().addListener(this, ADAPTER_POINT_ID);
return factoriesAdded;
}
private void registerExtension(IExtension extension) {
IConfigurationElement[] elements = extension.getConfigurationElements();
for (int j = 0; j < elements.length; j++) {
AdapterFactoryProxy proxy = AdapterFactoryProxy.createProxy(elements[j]);
if (proxy != null)
theAdapterManager.registerFactory(proxy, proxy.getAdaptableType());
}
}
@Override
public synchronized void added(IExtension[] extensions) {
for (int i = 0; i < extensions.length; i++)
registerExtension(extensions[i]);
theAdapterManager.flushLookup();
}
@Override
public synchronized void removed(IExtension[] extensions) {
theAdapterManager.flushLookup();
for (int i = 0; i < extensions.length; i++) {
for (Iterator it = theAdapterManager.getFactories().values().iterator(); it.hasNext();) {
for (Iterator it2 = ((List) it.next()).iterator(); it2.hasNext();) {
IAdapterFactory factory = (IAdapterFactory) it2.next();
if (!(factory instanceof AdapterFactoryProxy))
continue;
if (((AdapterFactoryProxy) factory).originatesFrom(extensions[i]))
it2.remove();
}
}
}
}
@Override
public synchronized void added(IExtensionPoint[] extensionPoints) {
// nothing to do
}
@Override
public synchronized void removed(IExtensionPoint[] extensionPoints) {
// all extensions should have been removed by this point by #removed(IExtension[] extensions)
// nothing to do
}
/*
* Shuts down the listener by removing the registry change listener. Should only be
* invoked during platform shutdown.
*/
public synchronized void stop() {
RegistryFactory.getRegistry().removeListener(this);
}
}
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