/*******************************************************************************
* Copyright (c) 2012 Google, Inc.
* 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:
* Google, Inc. - initial API and implementation
*******************************************************************************/
package com.windowtester.internal.runtime.resolver;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtension;
import org.eclipse.core.runtime.IExtensionPoint;
import org.eclipse.core.runtime.Platform;
import org.osgi.framework.Bundle;
import com.windowtester.internal.debug.Logger;
import com.windowtester.internal.runtime.RuntimePlugin;
/**
* Manages class resolvers.
*/
public class ClassResolverContributionManager {
private static final String CLASS_TAG = "class";
private static final String RESOLVER_CONTRIB_EXTENSION_POINT = "classResolver";
private static final ClassResolverContributionManager INSTANCE = new ClassResolverContributionManager();
private IClassResolver[] resolvers;
public static ClassResolverContributionManager getInstance() {
return INSTANCE;
}
/**
* Answer the extensions for the <code>classResolver</code> extension point
*
* @return the extensions (not <code>null</code>, contains no <code>null</code>s)
*/
public IExtension[] getExtensions() {
IExtensionPoint extensionPoint = Platform.getExtensionRegistry().getExtensionPoint(RuntimePlugin.PLUGIN_ID, RESOLVER_CONTRIB_EXTENSION_POINT);
if (extensionPoint == null)
return new IExtension[] {};
return extensionPoint.getExtensions();
}
public IClassResolver[] getContributedResolvers() {
if (resolvers == null)
resolvers = doGetContributors();
return resolvers;
}
private IClassResolver[] doGetContributors() {
IExtension[] allExtensions = getExtensions();
List actions = new ArrayList();
for (int i = 0; i < allExtensions.length; i++) {
IExtension extension = allExtensions[i];
IConfigurationElement[] allElements = extension.getConfigurationElements();
for (int j = 0; j < allElements.length; j++) {
IConfigurationElement element = allElements[j];
if (element.getName().equals(RESOLVER_CONTRIB_EXTENSION_POINT)) {
try {
String clsName = element.getAttribute(CLASS_TAG);
//pre 3.2: String namespace = extension.getNamespace();
String namespace = extension.getContributor().getName();
Bundle bundle = Platform.getBundle(namespace);
Class cls = bundle.loadClass(clsName);
IClassResolver action = (IClassResolver)cls.newInstance();
actions.add(action);
} catch (Exception e) {
Logger.log("An error occured configuring contributed class resolvers", e);
}
}
}
}
return (IClassResolver[])actions.toArray(new IClassResolver[]{});
}
public static Class resolveClass(String className) {
IClassResolver[] resolvers = getInstance().getContributedResolvers();
for (int i = 0; i < resolvers.length; i++) {
IClassResolver resolver = resolvers[i];
Class cls = resolver.resolveClass(className);
if (cls != null)
return cls;
}
return null;
}
}