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/*******************************************************************************
* Copyright (c) 2005, 2008 IBM Corporation 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.osgi.internal.loader.buddy;
import java.io.IOException;
import java.net.URL;
import java.util.Enumeration;
import java.util.Iterator;
import org.eclipse.osgi.framework.internal.core.AbstractBundle;
import org.eclipse.osgi.framework.internal.core.Constants;
import org.eclipse.osgi.internal.loader.BundleLoader;
import org.eclipse.osgi.internal.loader.BundleLoaderProxy;
import org.eclipse.osgi.service.resolver.BundleDescription;
import org.eclipse.osgi.util.ManifestElement;
import org.osgi.framework.BundleException;
/**
*Registered policy is an implementation of a buddy policy.
* It is responsible for looking up a class in the bundles (registrant) that declare interest in the bundle that require the buddy loading.
* Note that the registrants must have a direct dependency on the bundle needing buddy.
*/
public class RegisteredPolicy extends DependentPolicy {
public RegisteredPolicy(BundleLoader requester) {
super(requester);
//Filter the dependents;
if (allDependents == null)
return;
for (Iterator iter = allDependents.iterator(); iter.hasNext();) {
BundleLoaderProxy proxy = buddyRequester.getLoaderProxy((BundleDescription) iter.next());
if (proxy == null)
iter.remove();
try {
String[] allContributions = ManifestElement.getArrayFromList((String) ((AbstractBundle) proxy.getBundle()).getBundleData().getManifest().get(Constants.REGISTERED_POLICY));
if (allContributions == null) {
iter.remove();
continue;
}
boolean contributes = false;
for (int j = 0; j < allContributions.length && contributes == false; j++) {
if (allContributions[j].equals(buddyRequester.getBundle().getSymbolicName()))
contributes = true;
}
if (!contributes)
iter.remove();
} catch (BundleException e) {
iter.remove();
}
}
//After the filtering, if nothing is left then null out the variable for optimization
if (allDependents.size() == 0)
allDependents = null;
}
public Class loadClass(String name) {
if (allDependents == null)
return null;
Class result = null;
int size = allDependents.size();
for (int i = 0; i < size && result == null; i++) {
try {
BundleLoaderProxy proxy = buddyRequester.getLoaderProxy((BundleDescription) allDependents.get(i));
if (proxy == null)
continue;
result = proxy.getBundleLoader().findClass(name);
} catch (ClassNotFoundException e) {
//Nothing to do, just keep looking
continue;
}
}
return result;
}
public URL loadResource(String name) {
if (allDependents == null)
return null;
URL result = null;
int size = allDependents.size();
for (int i = 0; i < size && result == null; i++) {
BundleLoaderProxy proxy = buddyRequester.getLoaderProxy((BundleDescription) allDependents.get(i));
if (proxy == null)
continue;
result = proxy.getBundleLoader().findResource(name);
}
return result;
}
public Enumeration loadResources(String name) {
if (allDependents == null)
return null;
Enumeration results = null;
int size = allDependents.size();
for (int i = 0; i < size; i++) {
try {
BundleLoaderProxy proxy = buddyRequester.getLoaderProxy((BundleDescription) allDependents.get(i));
if (proxy == null)
continue;
results = BundleLoader.compoundEnumerations(results, proxy.getBundleLoader().findResources(name));
} catch (IOException e) {
//Ignore and keep looking
}
}
return results;
}
}
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