/*******************************************************************************
* Copyright (c) 2005, 2010 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 org.eclipse.osgi.internal.loader.BundleLoader;
import org.osgi.service.packageadmin.ExportedPackage;
import org.osgi.service.packageadmin.PackageAdmin;
/**
* Global policy is an implementation of a buddy policy. It is responsible
* for looking up a class within the global set of exported classes. If multiple
* version of the same package are exported in the system, the exported package
* with the highest version will be returned.
*/
public class GlobalPolicy implements IBuddyPolicy {
private PackageAdmin admin;
public GlobalPolicy(PackageAdmin admin) {
this.admin = admin;
}
public Class<?> loadClass(String name) {
ExportedPackage pkg = admin.getExportedPackage(BundleLoader.getPackageName(name));
if (pkg == null)
return null;
try {
return pkg.getExportingBundle().loadClass(name);
} catch (ClassNotFoundException e) {
return null;
}
}
public URL loadResource(String name) {
//get all exported packages that match the resource's package
ExportedPackage pkg = admin.getExportedPackage(BundleLoader.getResourcePackageName(name));
if (pkg == null)
return null;
return pkg.getExportingBundle().getResource(name);
}
public Enumeration<URL> loadResources(String name) {
//get all exported packages that match the resource's package
ExportedPackage[] pkgs = admin.getExportedPackages(BundleLoader.getResourcePackageName(name));
if (pkgs == null || pkgs.length == 0)
return null;
//get all matching resources for each package
Enumeration<URL> results = null;
for (int i = 0; i < pkgs.length; i++) {
try {
results = BundleLoader.compoundEnumerations(results, pkgs[i].getExportingBundle().getResources(name));
} catch (IOException e) {
//ignore IO problems and try next package
}
}
return results;
}
}