| /******************************************************************************* |
| * Copyright (c) 2008, 2009 Martin Lippert 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: |
| * Martin Lippert initial implementation |
| * Martin Lippert fragment handling fixed |
| *******************************************************************************/ |
| |
| package org.eclipse.equinox.weaving.hooks; |
| |
| import java.io.FileNotFoundException; |
| import java.net.URL; |
| import java.util.Enumeration; |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| import org.eclipse.equinox.service.weaving.ISupplementerRegistry; |
| import org.eclipse.equinox.service.weaving.Supplementer; |
| import org.eclipse.osgi.framework.adaptor.BundleClassLoader; |
| import org.eclipse.osgi.framework.adaptor.BundleData; |
| import org.eclipse.osgi.framework.adaptor.ClassLoaderDelegateHook; |
| |
| /** |
| * This class implements the delegate hook for the class loader to allow |
| * supplemented bundles find types and resources from theirs supplementer |
| * bundles |
| * |
| * This works together with the supplementer registry to handle the |
| * supplementing mechanism. The supplementer registry controls which bundle is |
| * supplemented by which other bundle. This hook implementation uses this |
| * information to broaden type and resource visibility according to the |
| * supplementer registry information. |
| */ |
| public class WeavingLoaderDelegateHook implements ClassLoaderDelegateHook { |
| |
| private final ThreadLocal<Set<String>> postFindClassCalls = new ThreadLocal<Set<String>>() { |
| |
| @Override |
| protected Set<String> initialValue() { |
| return new HashSet<String>(); |
| } |
| }; |
| |
| private final ThreadLocal<Set<String>> postFindResourceCalls = new ThreadLocal<Set<String>>() { |
| |
| @Override |
| protected Set<String> initialValue() { |
| return new HashSet<String>(); |
| } |
| }; |
| |
| private final ThreadLocal<Set<String>> postFindResourcesCalls = new ThreadLocal<Set<String>>() { |
| |
| @Override |
| protected Set<String> initialValue() { |
| return new HashSet<String>(); |
| } |
| }; |
| |
| private final ISupplementerRegistry supplementerRegistry; |
| |
| /** |
| * Create the hook instance for broaden the visibility according to the |
| * supplementing mechansism. |
| * |
| * @param supplementerRegistry The supplementer registry to be used by this |
| * hook for information retrieval which bundles are supplemented |
| * by which other bundles (needs to not be null) |
| */ |
| public WeavingLoaderDelegateHook( |
| final ISupplementerRegistry supplementerRegistry) { |
| this.supplementerRegistry = supplementerRegistry; |
| } |
| |
| /** |
| * @see org.eclipse.osgi.framework.adaptor.ClassLoaderDelegateHook#postFindClass(java.lang.String, |
| * org.eclipse.osgi.framework.adaptor.BundleClassLoader, |
| * org.eclipse.osgi.framework.adaptor.BundleData) |
| */ |
| public Class postFindClass(final String name, |
| final BundleClassLoader classLoader, final BundleData data) |
| throws ClassNotFoundException { |
| final long bundleID = data.getBundleID(); |
| |
| final String callKey = bundleID + name; |
| if (postFindClassCalls.get().contains(callKey)) { |
| return null; |
| } |
| |
| postFindClassCalls.get().add(callKey); |
| try { |
| final Supplementer[] supplementers = supplementerRegistry |
| .getSupplementers(bundleID); |
| if (supplementers != null) { |
| for (int i = 0; i < supplementers.length; i++) { |
| try { |
| final Class<?> clazz = supplementers[i] |
| .getSupplementerHost().loadClass(name); |
| if (clazz != null) { |
| return clazz; |
| } |
| } catch (final ClassNotFoundException e) { |
| } |
| } |
| } |
| } finally { |
| postFindClassCalls.get().remove(callKey); |
| } |
| |
| return null; |
| } |
| |
| /** |
| * @see org.eclipse.osgi.framework.adaptor.ClassLoaderDelegateHook#postFindLibrary(java.lang.String, |
| * org.eclipse.osgi.framework.adaptor.BundleClassLoader, |
| * org.eclipse.osgi.framework.adaptor.BundleData) |
| */ |
| public String postFindLibrary(final String name, |
| final BundleClassLoader classLoader, final BundleData data) { |
| return null; |
| } |
| |
| /** |
| * @see org.eclipse.osgi.framework.adaptor.ClassLoaderDelegateHook#postFindResource(java.lang.String, |
| * org.eclipse.osgi.framework.adaptor.BundleClassLoader, |
| * org.eclipse.osgi.framework.adaptor.BundleData) |
| */ |
| public URL postFindResource(final String name, |
| final BundleClassLoader classLoader, final BundleData data) |
| throws FileNotFoundException { |
| final long bundleID = data.getBundleID(); |
| |
| final String callKey = bundleID + name; |
| if (postFindResourceCalls.get().contains(callKey)) { |
| return null; |
| } |
| |
| postFindResourceCalls.get().add(callKey); |
| try { |
| final Supplementer[] supplementers = supplementerRegistry |
| .getSupplementers(bundleID); |
| if (supplementers != null) { |
| for (int i = 0; i < supplementers.length; i++) { |
| try { |
| final URL resource = supplementers[i] |
| .getSupplementerHost().getResource(name); |
| if (resource != null) { |
| return resource; |
| } |
| } catch (final Exception e) { |
| e.printStackTrace(); |
| } |
| } |
| } |
| } finally { |
| postFindResourceCalls.get().remove(callKey); |
| } |
| |
| return null; |
| } |
| |
| /** |
| * @see org.eclipse.osgi.framework.adaptor.ClassLoaderDelegateHook#postFindResources(java.lang.String, |
| * org.eclipse.osgi.framework.adaptor.BundleClassLoader, |
| * org.eclipse.osgi.framework.adaptor.BundleData) |
| */ |
| public Enumeration postFindResources(final String name, |
| final BundleClassLoader classLoader, final BundleData data) |
| throws FileNotFoundException { |
| final long bundleID = data.getBundleID(); |
| |
| final String callKey = bundleID + name; |
| if (postFindResourcesCalls.get().contains(callKey)) { |
| return null; |
| } |
| |
| postFindResourcesCalls.get().add(callKey); |
| try { |
| final Supplementer[] supplementers = supplementerRegistry |
| .getSupplementers(bundleID); |
| if (supplementers != null) { |
| for (int i = 0; i < supplementers.length; i++) { |
| try { |
| final Enumeration<?> resource = supplementers[i] |
| .getSupplementerHost().getResources(name); |
| if (resource != null) { |
| // TODO: if more than one enumeration is found, we should return all items |
| return resource; |
| } |
| } catch (final Exception e) { |
| e.printStackTrace(); |
| } |
| } |
| } |
| } finally { |
| postFindResourcesCalls.get().remove(callKey); |
| } |
| |
| return null; |
| } |
| |
| /** |
| * @see org.eclipse.osgi.framework.adaptor.ClassLoaderDelegateHook#preFindClass(java.lang.String, |
| * org.eclipse.osgi.framework.adaptor.BundleClassLoader, |
| * org.eclipse.osgi.framework.adaptor.BundleData) |
| */ |
| public Class preFindClass(final String name, |
| final BundleClassLoader classLoader, final BundleData data) |
| throws ClassNotFoundException { |
| return null; |
| } |
| |
| /** |
| * @see org.eclipse.osgi.framework.adaptor.ClassLoaderDelegateHook#preFindLibrary(java.lang.String, |
| * org.eclipse.osgi.framework.adaptor.BundleClassLoader, |
| * org.eclipse.osgi.framework.adaptor.BundleData) |
| */ |
| public String preFindLibrary(final String name, |
| final BundleClassLoader classLoader, final BundleData data) |
| throws FileNotFoundException { |
| return null; |
| } |
| |
| /** |
| * @see org.eclipse.osgi.framework.adaptor.ClassLoaderDelegateHook#preFindResource(java.lang.String, |
| * org.eclipse.osgi.framework.adaptor.BundleClassLoader, |
| * org.eclipse.osgi.framework.adaptor.BundleData) |
| */ |
| public URL preFindResource(final String name, |
| final BundleClassLoader classLoader, final BundleData data) |
| throws FileNotFoundException { |
| return null; |
| } |
| |
| /** |
| * @see org.eclipse.osgi.framework.adaptor.ClassLoaderDelegateHook#preFindResources(java.lang.String, |
| * org.eclipse.osgi.framework.adaptor.BundleClassLoader, |
| * org.eclipse.osgi.framework.adaptor.BundleData) |
| */ |
| public Enumeration preFindResources(final String name, |
| final BundleClassLoader classLoader, final BundleData data) |
| throws FileNotFoundException { |
| return null; |
| } |
| |
| } |
