/*
 * SonarQube
 * Copyright (C) 2009-2017 SonarSource SA
 * mailto:info AT sonarsource DOT com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package org.sonar.core.i18n;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.Lists;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.List;
import org.sonar.api.Plugin;
import org.sonar.api.SonarPlugin;
import org.sonar.core.platform.PluginInfo;
import org.sonar.core.platform.PluginRepository;

/**
 * Aggregation of all plugin and core classloaders, used to search for all l10n bundles
 */
class I18nClassloader extends URLClassLoader {

  private final ClassLoader[] pluginClassloaders;

  public I18nClassloader(PluginRepository pluginRepository) {
    this(allPluginClassloaders(pluginRepository));
  }

  @VisibleForTesting
  I18nClassloader(List<ClassLoader> pluginClassloaders) {
    super(new URL[0]);
    this.pluginClassloaders = pluginClassloaders.toArray(new ClassLoader[pluginClassloaders.size()]);
  }

  @Override
  public URL getResource(String name) {
    for (ClassLoader pluginClassloader : pluginClassloaders) {
      URL url = pluginClassloader.getResource(name);
      if (url != null) {
        return url;
      }
    }
    return getClass().getClassLoader().getResource(name);
  }

  @Override
  protected synchronized Class loadClass(String s, boolean b) throws ClassNotFoundException {
    throw new UnsupportedOperationException("I18n classloader does support only resources, but not classes");
  }

  @Override
  public String toString() {
    return "i18n-classloader";
  }

  private static List<ClassLoader> allPluginClassloaders(PluginRepository pluginRepository) {
    // accepted limitation: some plugins extend base plugins, sharing the same classloader, so
    // there may be duplicated classloaders in the list.
    List<ClassLoader> list = Lists.newArrayList();
    for (PluginInfo info : pluginRepository.getPluginInfos()) {
      Plugin plugin = pluginRepository.getPluginInstance(info.getKey());
      list.add(plugin.getClass().getClassLoader());
    }
    list.add(I18nClassloader.class.getClassLoader());
    return list;
  }
}