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/*******************************************************************************
* Copyright (c) 2006, 2012 Obeo.
* 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:
* Obeo - initial API and implementation
*******************************************************************************/
package org.eclipse.emf.compare.diagram.provider.internal;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtension;
import org.eclipse.core.runtime.IExtensionPoint;
import org.eclipse.core.runtime.IExtensionRegistry;
import org.eclipse.core.runtime.IRegistryEventListener;
import org.eclipse.core.runtime.Platform;
import org.eclipse.emf.compare.diagram.provider.ViewLabelProviderExtensionRegistry;
/**
* This listener will allow us to be aware of contribution changes against the extension point.
*
* @author <a href="mailto:mikael.barbero@obeo.fr">Mikael Barbero</a>
*/
public class ViewLabelProviderRegistryListener implements IRegistryEventListener {
/** Name of the extension point's tag. */
public static final String VIEW_LABELPROVIDER_EXTENSION_POINT = "org.eclipse.emf.compare.diagram.ide.viewLabelProvider"; //$NON-NLS-1$
/** Name of the extension tag point's tag. */
private static final String VIEW_LABELPROVIDER_TAG = "viewLabelProvider"; //$NON-NLS-1$
/**
* {@inheritDoc}
*
* @see org.eclipse.core.runtime.IRegistryEventListener#added(org.eclipse.core.runtime.IExtension[])
*/
public void added(IExtension[] extensions) {
for (IExtension extension : extensions) {
parseExtension(extension);
}
}
/**
* {@inheritDoc}
*
* @see org.eclipse.core.runtime.IRegistryEventListener#added(org.eclipse.core.runtime.IExtensionPoint[])
*/
public void added(IExtensionPoint[] extensionPoints) {
// no need to listen to this event
}
/**
* Though this listener reacts to the extension point changes, there could have been contributions before
* it's been registered. This will parse these initial contributions.
*/
public void parseInitialContributions() {
final IExtensionRegistry registry = Platform.getExtensionRegistry();
final IExtensionPoint extensionPoint = registry.getExtensionPoint(VIEW_LABELPROVIDER_EXTENSION_POINT);
if (extensionPoint != null) {
for (IExtension extension :extensionPoint.getExtensions()) {
parseExtension(extension);
}
}
}
/**
* {@inheritDoc}
*
* @see org.eclipse.core.runtime.IRegistryEventListener#removed(org.eclipse.core.runtime.IExtension[])
*/
public void removed(IExtension[] extensions) {
for (IExtension extension : extensions) {
final IConfigurationElement[] configElements = extension.getConfigurationElements();
for (IConfigurationElement elem : configElements) {
if (VIEW_LABELPROVIDER_TAG.equals(elem.getName())) {
final String extensionClassName = elem
.getAttribute(ViewLabelProviderIDEExtensionDescriptor.ATTRIBUTE_CLASS);
ViewLabelProviderExtensionRegistry.removeExtension(extensionClassName);
}
}
}
}
/**
* {@inheritDoc}
*
* @see org.eclipse.core.runtime.IRegistryEventListener#removed(org.eclipse.core.runtime.IExtensionPoint[])
*/
public void removed(IExtensionPoint[] extensionPoints) {
// no need to listen to this event
}
/**
* Parses a single extension contribution.
*
* @param extension
* Parses the given extension and adds its contribution to the registry.
*/
private static void parseExtension(IExtension extension) {
final IConfigurationElement[] configElements = extension.getConfigurationElements();
for (IConfigurationElement elem : configElements) {
if (VIEW_LABELPROVIDER_TAG.equals(elem.getName())) {
ViewLabelProviderExtensionRegistry.addViewLabelProvider(new ViewLabelProviderIDEExtensionDescriptor(elem));
}
}
}
}
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