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/*******************************************************************************
* Copyright (c) 2007, 2010 BMW Car IT, Technische Universitaet Muenchen, 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:
* Johannes Faltermeier - Initial API and implementation
*******************************************************************************/
package org.eclipse.emf.edapt.internal.migration;
import java.lang.reflect.InvocationTargetException;
import java.util.LinkedHashMap;
import java.util.Map;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtensionRegistry;
import org.eclipse.core.runtime.Platform;
import org.eclipse.emf.ecore.EFactory;
import org.eclipse.emf.ecore.EPackage;
import org.eclipse.emf.edapt.spi.migration.MigrationPlugin;
import org.osgi.framework.Bundle;
/**
* Helper class for reading custom {@link EFactory EFactories} from the extension point.
*
* @author jfaltermeier
*
*/
public final class FactoryHelper {
/**
* The instance.
*/
public static final FactoryHelper INSTANCE = new FactoryHelper();
private static final String CLASS = "class";
private static final String NS_URI = "nsURI";
private static final String POINT_ID = "org.eclipse.emf.edapt.factories";
private Map<String, Class<? extends EFactory>> nsURIToFactoryMap;
private FactoryHelper() {
nsURIToFactoryMap = new LinkedHashMap<String, Class<? extends EFactory>>();
readExtensionPoint();
}
private void readExtensionPoint() {
final IExtensionRegistry extensionRegistry = Platform
.getExtensionRegistry();
final IConfigurationElement[] configurationElements = extensionRegistry
.getConfigurationElementsFor(POINT_ID);
for (final IConfigurationElement configurationElement : configurationElements) {
registerFactory(configurationElement);
}
}
private void registerFactory(IConfigurationElement configurationElement) {
try {
String nsURI = configurationElement.getAttribute(NS_URI);
String bundle = configurationElement.getContributor().getName();
String className = configurationElement.getAttribute(CLASS);
Class<? extends EFactory> clazz = loadClass(bundle, className);
if (nsURI == null || clazz == null) {
return;
}
nsURIToFactoryMap.put(nsURI, clazz);
} catch (ClassNotFoundException e) {
MigrationPlugin.INSTANCE.log(e);
}
}
@SuppressWarnings("unchecked")
private static Class<? extends EFactory> loadClass(String bundleName,
String clazz) throws ClassNotFoundException {
final Bundle bundle = Platform.getBundle(bundleName);
if (bundle == null) {
MigrationPlugin.INSTANCE.log("Could not get bundle " + bundleName + " from platform.");
}
return (Class<? extends EFactory>) bundle.loadClass(clazz);
}
/**
* Overrides the {@link EFactory} for the given {@link EPackage} if a custom EFactory
* was registered for the factory's nsURI.
*
* @param ePackage the package
*/
public void overrideFactory(EPackage ePackage) {
try {
if (!nsURIToFactoryMap.containsKey(ePackage.getNsURI())) {
return;
}
Class<? extends EFactory> clazz = nsURIToFactoryMap.get(ePackage
.getNsURI());
EFactory eFactory = clazz.getConstructor().newInstance();
ePackage.setEFactoryInstance(eFactory);
} catch (InstantiationException e) {
MigrationPlugin.INSTANCE.log(e);
} catch (IllegalAccessException e) {
MigrationPlugin.INSTANCE.log(e);
} catch (IllegalArgumentException e) {
MigrationPlugin.INSTANCE.log(e);
} catch (InvocationTargetException e) {
MigrationPlugin.INSTANCE.log(e);
} catch (NoSuchMethodException e) {
MigrationPlugin.INSTANCE.log(e);
} catch (SecurityException e) {
MigrationPlugin.INSTANCE.log(e);
}
}
}
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