/*
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* Copyright 2014 gitblit.com.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.gitblit.wicket;
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import java.io.IOException;
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import java.net.URL;
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import java.util.Enumeration;
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import java.util.HashSet;
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import java.util.Iterator;
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import java.util.Set;
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import java.util.TreeSet;
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import org.apache.wicket.WicketRuntimeException;
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import org.apache.wicket.application.IClassResolver;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import ro.fortsoft.pf4j.PluginState;
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import ro.fortsoft.pf4j.PluginWrapper;
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import com.gitblit.manager.IPluginManager;
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/**
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* Resolves plugin classes and resources.
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*/
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public class PluginClassResolver implements IClassResolver {
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private static final Logger logger = LoggerFactory.getLogger(PluginClassResolver.class);
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private final IClassResolver coreResolver;
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private final IPluginManager pluginManager;
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public PluginClassResolver(IClassResolver coreResolver, IPluginManager pluginManager) {
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this.coreResolver = coreResolver;
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this.pluginManager = pluginManager;
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}
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@Override
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public Class<?> resolveClass(final String className) throws ClassNotFoundException {
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boolean debugEnabled = logger.isDebugEnabled();
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for (PluginWrapper plugin : pluginManager.getPlugins()) {
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if (PluginState.STARTED != plugin.getPluginState()) {
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// ignore this plugin
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continue;
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}
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try {
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return plugin.getPluginClassLoader().loadClass(className);
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} catch (ClassNotFoundException cnfx) {
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if (debugEnabled) {
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logger.debug("ClassResolver '{}' cannot find class: '{}'", plugin.getPluginId(), className);
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}
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}
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}
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return coreResolver.resolveClass(className);
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}
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@Override
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public Iterator<URL> getResources(final String name) {
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Set<URL> urls = new TreeSet<URL>(new UrlExternalFormComparator());
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for (PluginWrapper plugin : pluginManager.getPlugins()) {
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if (PluginState.STARTED != plugin.getPluginState()) {
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// ignore this plugin
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continue;
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}
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Iterator<URL> it = getResources(name, plugin);
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while (it.hasNext()) {
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URL url = it.next();
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urls.add(url);
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}
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}
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Iterator<URL> it = coreResolver.getResources(name);
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while (it.hasNext()) {
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URL url = it.next();
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urls.add(url);
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}
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return urls.iterator();
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}
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protected Iterator<URL> getResources(String name, PluginWrapper plugin) {
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HashSet<URL> loadedFiles = new HashSet<URL>();
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try {
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// Try the classloader for the wicket jar/bundle
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Enumeration<URL> resources = plugin.getPluginClassLoader().getResources(name);
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loadResources(resources, loadedFiles);
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} catch (IOException e) {
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throw new WicketRuntimeException(e);
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}
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return loadedFiles.iterator();
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}
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private void loadResources(Enumeration<URL> resources, Set<URL> loadedFiles) {
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if (resources != null) {
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while (resources.hasMoreElements()) {
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final URL url = resources.nextElement();
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if (!loadedFiles.contains(url)) {
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loadedFiles.add(url);
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}
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}
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}
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}
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}
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