org.sonar.server.plugins.ServerExtensionInstaller.java Source code

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Here is the source code for org.sonar.server.plugins.ServerExtensionInstaller.java

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/*
 * Sonar, open source software quality management tool.
 * Copyright (C) 2008-2012 SonarSource
 * mailto:contact AT sonarsource DOT com
 *
 * Sonar 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.
 *
 * Sonar 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 Sonar; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
 */
package org.sonar.server.plugins;

import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.ListMultimap;
import org.sonar.api.Extension;
import org.sonar.api.ExtensionProvider;
import org.sonar.api.Plugin;
import org.sonar.api.ServerExtension;
import org.sonar.api.platform.ComponentContainer;
import org.sonar.api.platform.PluginMetadata;
import org.sonar.api.platform.PluginRepository;

import java.util.Map;

public class ServerExtensionInstaller {
    private PluginRepository pluginRepository;

    public ServerExtensionInstaller(PluginRepository pluginRepository) {
        this.pluginRepository = pluginRepository;
    }

    public void registerExtensions(ComponentContainer container) {
        ListMultimap<PluginMetadata, Object> installedExtensionsByPlugin = ArrayListMultimap.create();

        for (PluginMetadata pluginMetadata : pluginRepository.getMetadata()) {
            Plugin plugin = pluginRepository.getPlugin(pluginMetadata.getKey());
            container.addExtension(pluginMetadata, plugin);

            for (Object extension : plugin.getExtensions()) {
                if (installExtension(container, pluginMetadata, extension, true) != null) {
                    installedExtensionsByPlugin.put(pluginMetadata, extension);
                } else {
                    container.declareExtension(pluginMetadata, extension);
                }
            }
        }
        for (Map.Entry<PluginMetadata, Object> entry : installedExtensionsByPlugin.entries()) {
            PluginMetadata plugin = entry.getKey();
            Object extension = entry.getValue();
            if (isExtensionProvider(extension)) {
                ExtensionProvider provider = (ExtensionProvider) container.getComponentByKey(extension);
                installProvider(container, plugin, provider);
            }
        }
    }

    private void installProvider(ComponentContainer container, PluginMetadata plugin, ExtensionProvider provider) {
        Object obj = provider.provide();
        if (obj != null) {
            if (obj instanceof Iterable) {
                for (Object ext : (Iterable) obj) {
                    installExtension(container, plugin, ext, false);
                }
            } else {
                installExtension(container, plugin, obj, false);
            }
        }
    }

    Object installExtension(ComponentContainer container, PluginMetadata pluginMetadata, Object extension,
            boolean acceptProvider) {
        if (isType(extension, ServerExtension.class)) {
            if (!acceptProvider && isExtensionProvider(extension)) {
                throw new IllegalStateException("ExtensionProvider can not include providers itself: " + extension);
            }
            container.addExtension(pluginMetadata, extension);
            return extension;
        }
        return null;
    }

    static boolean isExtensionProvider(Object extension) {
        return isType(extension, ExtensionProvider.class) || extension instanceof ExtensionProvider;
    }

    static boolean isType(Object extension, Class<? extends Extension> extensionClass) {
        Class clazz = (extension instanceof Class ? (Class) extension : extension.getClass());
        return extensionClass.isAssignableFrom(clazz);
    }
}