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/*
* Copyright 2000-2014 JetBrains s.r.o.
*
* 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.intellij.jps.impl;
import com.intellij.openapi.extensions.*;
import com.intellij.openapi.vfs.CharsetToolkit;
import com.intellij.util.containers.ContainerUtil;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.jps.plugin.JpsPluginManager;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.*;
import java.util.concurrent.CopyOnWriteArrayList;
/**
* @author nik
*/
public class JpsIdePluginManagerImpl extends JpsPluginManager {
private List<PluginDescriptor> myExternalBuildPlugins = new CopyOnWriteArrayList<PluginDescriptor>();
public JpsIdePluginManagerImpl() {
ExtensionsArea rootArea = Extensions.getRootArea();
//todo[nik] introduce more generic platform extension for JPS plugins instead
if (rootArea.hasExtensionPoint("com.intellij.compileServer.plugin")) {
ExtensionPoint extensionPoint = rootArea.getExtensionPoint("com.intellij.compileServer.plugin");
extensionPoint.addExtensionPointListener(new ExtensionPointListener() {
@Override
public void extensionAdded(@NotNull Object extension, @Nullable PluginDescriptor pluginDescriptor) {
if (pluginDescriptor != null) {
myExternalBuildPlugins.add(pluginDescriptor);
}
}
@Override
public void extensionRemoved(@NotNull Object extension, @Nullable PluginDescriptor pluginDescriptor) {
}
});
}
}
@NotNull
@Override
public <T> Collection<T> loadExtensions(@NotNull Class<T> extensionClass) {
String resourceName = "META-INF/services/" + extensionClass.getName();
Set<Class<T>> classes = new LinkedHashSet<Class<T>>();
Set<ClassLoader> loaders = new LinkedHashSet<ClassLoader>();
for (PluginDescriptor plugin : myExternalBuildPlugins) {
ContainerUtil.addIfNotNull(loaders, plugin.getPluginClassLoader());
}
if (loaders.isEmpty()) {
loaders.add(getClass().getClassLoader());
}
Set<String> loadedUrls = new HashSet<String>();
for (ClassLoader loader : loaders) {
try {
Enumeration<URL> resources = loader.getResources(resourceName);
while (resources.hasMoreElements()) {
URL url = resources.nextElement();
if (loadedUrls.add(url.toExternalForm())) {
loadImplementations(url, loader, classes);
}
}
}
catch (IOException e) {
throw new ServiceConfigurationError("Cannot load configuration files for " + extensionClass.getName(), e);
}
}
List<T> extensions = new ArrayList<T>();
for (Class<T> aClass : classes) {
try {
extensions.add(extensionClass.cast(aClass.newInstance()));
}
catch (Exception e) {
throw new ServiceConfigurationError("Class " + aClass.getName() + " cannot be instantiated", e);
}
}
return extensions;
}
private static <T> void loadImplementations(URL url, ClassLoader loader, Set<Class<T>> result) throws IOException {
for (String name : loadClassNames(url)) {
try {
//noinspection unchecked
result.add((Class<T>)Class.forName(name, false, loader));
}
catch (ClassNotFoundException e) {
throw new ServiceConfigurationError("Cannot find class " + name, e);
}
}
}
private static List<String> loadClassNames(URL url) throws IOException {
List<String> result = new ArrayList<String>();
BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream(), CharsetToolkit.UTF8));
try {
String line;
while ((line = in.readLine()) != null) {
int i = line.indexOf('#');
if (i >= 0) line = line.substring(0, i);
line = line.trim();
if (!line.isEmpty()) {
result.add(line);
}
}
}
finally {
in.close();
}
return result;
}
}
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