| /******************************************************************************* |
| * Copyright (c) 2005, 2013 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * 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 java.util.List; |
| import org.eclipse.osgi.container.ModuleCapability; |
| import org.eclipse.osgi.container.ModuleWiring; |
| import org.eclipse.osgi.container.namespaces.EquinoxModuleDataNamespace; |
| import org.eclipse.osgi.internal.loader.BundleLoader; |
| |
| /** |
| *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; |
| |
| String requesterName = requester.getWiring().getRevision().getSymbolicName(); |
| for (Iterator<ModuleWiring> iter = allDependents.iterator(); iter.hasNext();) { |
| ModuleWiring wiring = iter.next(); |
| List<ModuleCapability> moduleDatas = wiring.getRevision().getModuleCapabilities(EquinoxModuleDataNamespace.MODULE_DATA_NAMESPACE); |
| @SuppressWarnings("unchecked") |
| List<String> registeredList = (List<String>) (moduleDatas.isEmpty() ? null : moduleDatas.get(0).getAttributes().get(EquinoxModuleDataNamespace.CAPABILITY_BUDDY_REGISTERED)); |
| if (registeredList == null || registeredList.isEmpty()) { |
| iter.remove(); |
| } else { |
| boolean contributes = false; |
| for (String registeredName : registeredList) { |
| if (registeredName.equals(requesterName)) { |
| contributes = true; |
| break; |
| } |
| } |
| if (!contributes) { |
| iter.remove(); |
| } |
| } |
| } |
| |
| //After the filtering, if nothing is left then null out the variable for optimization |
| if (allDependents.size() == 0) |
| allDependents = null; |
| } |
| |
| @Override |
| public Class<?> loadClass(String name) { |
| if (allDependents == null) { |
| return null; |
| } |
| int size = allDependents.size(); |
| for (int i = 0; i < size; i++) { |
| ModuleWiring searchWiring = allDependents.get(i); |
| BundleLoader searchLoader = (BundleLoader) searchWiring.getModuleLoader(); |
| if (searchLoader != null) { |
| Class<?> result = searchLoader.findClassNoParentNoException(name); |
| if (result != null) { |
| return result; |
| } |
| } |
| } |
| return null; |
| } |
| |
| @Override |
| 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++) { |
| ModuleWiring searchWiring = allDependents.get(i); |
| BundleLoader searchLoader = (BundleLoader) searchWiring.getModuleLoader(); |
| if (searchLoader != null) { |
| result = searchLoader.findResource(name); |
| } |
| } |
| return result; |
| } |
| |
| @Override |
| public Enumeration<URL> loadResources(String name) { |
| if (allDependents == null) |
| return null; |
| |
| Enumeration<URL> results = null; |
| int size = allDependents.size(); |
| for (int i = 0; i < size; i++) { |
| try { |
| ModuleWiring searchWiring = allDependents.get(i); |
| BundleLoader searchLoader = (BundleLoader) searchWiring.getModuleLoader(); |
| if (searchLoader != null) { |
| results = BundleLoader.compoundEnumerations(results, searchLoader.findResources(name)); |
| } |
| } catch (IOException e) { |
| //Ignore and keep looking |
| } |
| } |
| return results; |
| } |
| } |