| /******************************************************************************* |
| * Copyright (c) 2005, 2006 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.framework.internal.core; |
| |
| import java.io.IOException; |
| import java.net.URL; |
| import java.util.*; |
| import org.eclipse.osgi.service.resolver.BundleDescription; |
| |
| /** |
| * DependentPolicy is an implementation of a buddy policy. |
| * It is responsible for looking up a class in the dependents of the bundle |
| * to which this policy is attached to. |
| */ |
| public class DependentPolicy implements IBuddyPolicy { |
| BundleLoader buddyRequester; |
| int lastDependentOfAdded = -1; //remember the index of the bundle for which we last added the dependent |
| List allDependents = null; //the list of all dependents known so far |
| |
| public DependentPolicy(BundleLoader requester) { |
| buddyRequester = requester; |
| |
| //Initialize with the first level of dependent the list |
| allDependents = new ArrayList(); |
| basicAddImmediateDependents(buddyRequester.getBundle().getBundleDescription()); |
| //If there is no dependent, reset to null |
| if (allDependents.size() == 0) |
| allDependents = null; |
| } |
| |
| public Class loadClass(String name) { |
| if (allDependents == null) |
| return null; |
| |
| Class result = null; |
| //size may change, so we must check it every time |
| for (int i = 0; i < allDependents.size() && result == null; i++) { |
| BundleDescription searchedBundle = (BundleDescription) allDependents.get(i); |
| try { |
| BundleLoaderProxy proxy = buddyRequester.getLoaderProxy(searchedBundle); |
| if (proxy == null) |
| continue; |
| result = proxy.getBundleLoader().findClass(name, true); |
| } catch (ClassNotFoundException e) { |
| if (result == null) |
| addDependent(i, searchedBundle); |
| } |
| } |
| return result; |
| } |
| |
| private synchronized void addDependent(int i, BundleDescription searchedBundle) { |
| if (i > lastDependentOfAdded) { |
| lastDependentOfAdded = i; |
| basicAddImmediateDependents(searchedBundle); |
| } |
| } |
| |
| public URL loadResource(String name) { |
| if (allDependents == null) |
| return null; |
| |
| URL result = null; |
| //size may change, so we must check it every time |
| for (int i = 0; i < allDependents.size() && result == null; i++) { |
| BundleDescription searchedBundle = (BundleDescription) allDependents.get(i); |
| BundleLoaderProxy proxy = buddyRequester.getLoaderProxy(searchedBundle); |
| if (proxy == null) |
| continue; |
| result = proxy.getBundleLoader().findResource(name, true); |
| if (result == null) { |
| addDependent(i, searchedBundle); |
| } |
| } |
| return result; |
| } |
| |
| public Enumeration loadResources(String name) { |
| if (allDependents == null) |
| return null; |
| |
| Vector resources = null; |
| //size may change, so we must check it every time |
| for (int i = 0; i < allDependents.size(); i++) { |
| BundleDescription searchedBundle = (BundleDescription) allDependents.get(i); |
| try { |
| BundleLoaderProxy proxy = buddyRequester.getLoaderProxy(searchedBundle); |
| if (proxy == null) |
| continue; |
| Enumeration result = proxy.getBundleLoader().findResources(name); |
| if (result != null) { |
| if (resources == null) |
| resources = new Vector(); |
| while (result.hasMoreElements()) { |
| Object url = result.nextElement(); |
| if (!resources.contains(url)) //ignore exact duplicates |
| resources.add(url); |
| } |
| } |
| addDependent(i, searchedBundle); |
| } catch (IOException e) { |
| //Ignore and keep looking |
| } |
| } |
| return (resources == null) ? null : resources.elements(); |
| } |
| |
| private void basicAddImmediateDependents(BundleDescription root) { |
| BundleDescription[] dependents = root.getDependents(); |
| for (int i = 0; i < dependents.length; i++) { |
| BundleDescription toAdd = dependents[i]; |
| if (toAdd.getHost() == null && !allDependents.contains(toAdd)) { |
| allDependents.add(toAdd); |
| } |
| } |
| } |
| } |