| /******************************************************************************* |
| * Copyright (c) 2005, 2021 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.ArrayList; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.Enumeration; |
| import java.util.Map; |
| import org.eclipse.osgi.container.ModuleContainer; |
| import org.eclipse.osgi.container.ModuleWire; |
| import org.eclipse.osgi.container.ModuleWiring; |
| import org.eclipse.osgi.internal.container.Capabilities; |
| import org.eclipse.osgi.internal.loader.BundleLoader; |
| import org.osgi.framework.namespace.HostNamespace; |
| import org.osgi.framework.namespace.PackageNamespace; |
| import org.osgi.framework.wiring.BundleCapability; |
| import org.osgi.framework.wiring.BundleRevision; |
| import org.osgi.framework.wiring.FrameworkWiring; |
| import org.osgi.resource.Namespace; |
| |
| /** |
| * 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 FrameworkWiring frameworkWiring; |
| |
| public GlobalPolicy(FrameworkWiring frameworkWiring) { |
| this.frameworkWiring = frameworkWiring; |
| } |
| |
| @Override |
| public Class<?> loadClass(String name) { |
| return getExportingBundles(BundleLoader.getPackageName(name)) // |
| .stream().findFirst().map(b -> b.findClassNoParentNoException(name)).orElse(null); |
| } |
| |
| @Override |
| public URL loadResource(String name) { |
| return getExportingBundles(BundleLoader.getResourcePackageName(name)) // |
| .stream().findFirst().map(b -> b.findResource(name)).orElse(null); |
| } |
| |
| @Override |
| public Enumeration<URL> loadResources(String name) { |
| Enumeration<URL> results = null; |
| Collection<BundleLoader> exporters = getExportingBundles(name); |
| for (BundleLoader exporter : exporters) { |
| try { |
| results = BundleLoader.compoundEnumerations(results, exporter.findResources(name)); |
| }catch (IOException e) { |
| //ignore IO problems and try next package |
| } |
| } |
| return results; |
| } |
| |
| private Collection<BundleLoader> getExportingBundles(String pkgName) { |
| Collection<BundleLoader> result = new ArrayList<>(); |
| String filter = "(" + PackageNamespace.PACKAGE_NAMESPACE + "=" + pkgName + ")"; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ |
| Map<String, String> directives = Collections.singletonMap(Namespace.REQUIREMENT_FILTER_DIRECTIVE, filter); |
| Map<String, Boolean> attributes = Collections.singletonMap(Capabilities.SYNTHETIC_REQUIREMENT, Boolean.TRUE); |
| Collection<BundleCapability> packages = frameworkWiring.findProviders( |
| ModuleContainer.createRequirement(PackageNamespace.PACKAGE_NAMESPACE, directives, attributes)); |
| for (BundleCapability pkg : packages) { |
| ModuleWiring wiring = (ModuleWiring) pkg.getRevision().getWiring(); |
| if (wiring != null) { |
| if ((pkg.getRevision().getTypes() & BundleRevision.TYPE_FRAGMENT) != 0) { |
| // use the hosts |
| if (wiring != null) { |
| for (ModuleWire hostWire : wiring.getRequiredModuleWires(HostNamespace.HOST_NAMESPACE)) { |
| result.add((BundleLoader) hostWire.getProviderWiring().getModuleLoader()); |
| } |
| } |
| } else { |
| result.add((BundleLoader) wiring.getModuleLoader()); |
| } |
| } |
| } |
| return result; |
| } |
| } |