/*******************************************************************************
* Copyright (c) 2014 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.ide.ui.internal.logical.view.registry;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.ILog;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.emf.compare.ide.ui.internal.EMFCompareIDEUIMessages;
import org.eclipse.emf.compare.rcp.extension.AbstractRegistryEventListener;
/**
* This listener will react to changes against our logical model editor handler extension point, allowing us
* to be in sync with plugin activation and deactivation.
*
* @author <a href="mailto:axel.richard@obeo.fr">Axel Richard</a>
*/
public class LogicalModelViewHandlerRegistryListener extends AbstractRegistryEventListener {
/** The "handler" tag of our extension point. */
private static final String TAG_HANDLER = "handler"; //$NON-NLS-1$
/** The "class" attribute of our handler tag. */
private static final String ATTRIBUTE_CLASS = "class"; //$NON-NLS-1$
/** The "ranking" attribute of our handler tag. */
private static final String ATTRIBUTE_RANKING = "ranking"; //$NON-NLS-1$
/** The actual registry this listener will alter. */
private final LogicalModelViewHandlerRegistry registry;
/**
* Initialize a registry event listener for our handlers.
*
* @param pluginID
* ID of the plugin contributing the extension point to monitor.
* @param extensionPointID
* Actual id of the extension point to monitor.
* @param log
* Log in which errors/warning should be logged.
* @param registry
* The actual store of handlers this registry will alter.
*/
public LogicalModelViewHandlerRegistryListener(String pluginID, String extensionPointID, ILog log,
LogicalModelViewHandlerRegistry registry) {
super(pluginID, extensionPointID, log);
this.registry = registry;
}
/**
* {@inheritDoc}
*
* @see org.eclipse.emf.compare.rcp.extension.AbstractRegistryEventListener#addedValid(org.eclipse.core.runtime.IConfigurationElement)
*/
@Override
protected boolean addedValid(IConfigurationElement element) {
if (element.getName().equals(TAG_HANDLER)) {
final String className = element.getAttribute(ATTRIBUTE_CLASS);
final String rankingStr = element.getAttribute(ATTRIBUTE_RANKING);
int ranking = -1;
try {
ranking = Integer.parseInt(rankingStr);
} catch (NumberFormatException e) {
log(IStatus.ERROR, element, EMFCompareIDEUIMessages
.getString("ModelhandlerRegistry.invalidRanking", className, rankingStr)); //$NON-NLS-1$
}
final LogicalModelViewHandlerDescriptor descriptor = new LogicalModelViewHandlerDescriptor(
element, ATTRIBUTE_CLASS, ranking);
registry.addHandler(className, descriptor);
return true;
}
return false;
}
/**
* {@inheritDoc}
*
* @see org.eclipse.emf.compare.rcp.extension.AbstractRegistryEventListener#removedValid(org.eclipse.core.runtime.IConfigurationElement)
*/
@Override
protected boolean removedValid(IConfigurationElement element) {
final String className = element.getAttribute(ATTRIBUTE_CLASS);
registry.removeHandler(className);
return true;
}
/**
* {@inheritDoc}
*
* @see org.eclipse.emf.compare.rcp.extension.AbstractRegistryEventListener#validateExtensionElement(org.eclipse.core.runtime.IConfigurationElement)
*/
@Override
protected boolean validateExtensionElement(IConfigurationElement element) {
// Don't work twice as much, validate as we add.
// Removing cannot fail.
return true;
}
}