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/*******************************************************************************
* Copyright (c) 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.rcp.ui.internal.contentmergeviewer.accessor.factory.impl;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.ILog;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.emf.compare.rcp.extension.AbstractRegistryEventListener;
import org.eclipse.emf.compare.rcp.ui.internal.contentmergeviewer.accessor.factory.IAccessorFactory;
public class AccessorFactoryExtensionRegistryListener extends AbstractRegistryEventListener {
static final String TAG_FACTORY = "factory"; //$NON-NLS-1$
static final String ATT_CLASS = "class"; //$NON-NLS-1$
static final String ATT_RANKING = "ranking"; //$NON-NLS-1$
private final IAccessorFactory.Registry registry;
/**
* @param pluginID
* @param extensionPointID
* @param registry
*/
public AccessorFactoryExtensionRegistryListener(String pluginID, String extensionPointID, ILog log,
IAccessorFactory.Registry registry) {
super(pluginID, extensionPointID, log);
this.registry = registry;
}
/**
* {@inheritDoc}
*
* @see org.eclipse.emf.compare.rcp.extension.AbstractRegistryEventListener#validateExtensionElement(org.eclipse.core.runtime.IConfigurationElement)
*/
@Override
protected boolean validateExtensionElement(IConfigurationElement element) {
final boolean valid;
if (element.getName().equals(TAG_FACTORY)) {
if (element.getAttribute(ATT_CLASS) == null) {
logMissingAttribute(element, ATT_CLASS);
valid = false;
} else if (element.getAttribute(ATT_RANKING) == null) {
String rankingStr = element.getAttribute(ATT_RANKING);
try {
Integer.parseInt(rankingStr);
} catch (NumberFormatException nfe) {
log(IStatus.ERROR, element, "Attribute '" + ATT_RANKING
+ "' is malformed, should be an integer.");
}
logMissingAttribute(element, ATT_RANKING);
valid = false;
} else {
valid = true;
}
} else {
valid = false;
}
return valid;
}
/**
* {@inheritDoc}
*
* @see org.eclipse.emf.compare.rcp.extension.AbstractRegistryEventListener#addedValid(org.eclipse.core.runtime.IConfigurationElement)
*/
@Override
protected boolean addedValid(IConfigurationElement element) {
try {
IAccessorFactory factory = (IAccessorFactory)element.createExecutableExtension(ATT_CLASS);
factory.setRanking(Integer.parseInt(element.getAttribute(ATT_RANKING)));
IAccessorFactory previous = registry.add(factory);
if (previous != null) {
log(IStatus.WARNING, element, "The accessor factory '" + factory.getClass().getName()
+ "' is registered twice.");
}
} catch (CoreException e) {
log(element, e);
}
return true;
}
/**
* {@inheritDoc}
*
* @see org.eclipse.emf.compare.rcp.extension.AbstractRegistryEventListener#removedValid(org.eclipse.core.runtime.IConfigurationElement)
*/
@Override
protected boolean removedValid(IConfigurationElement element) {
registry.remove(element.getAttribute(ATT_CLASS));
return true;
}
}
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