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