001/*
002 * Copyright (C) 2012 eXo Platform SAS.
003 *
004 * This is free software; you can redistribute it and/or modify it
005 * under the terms of the GNU Lesser General Public License as
006 * published by the Free Software Foundation; either version 2.1 of
007 * the License, or (at your option) any later version.
008 *
009 * This software is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 * Lesser General Public License for more details.
013 *
014 * You should have received a copy of the GNU Lesser General Public
015 * License along with this software; if not, write to the Free
016 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
017 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
018 */
019package org.crsh.jcr;
020
021import groovy.lang.GroovySystem;
022import groovy.lang.MetaClassRegistry;
023import org.crsh.jcr.groovy.NodeMetaClass;
024import org.crsh.plugin.CRaSHPlugin;
025
026import javax.jcr.Node;
027import java.beans.IntrospectionException;
028import java.util.*;
029import javax.jcr.Repository;
030
031public abstract class JCRPlugin<T extends JCRPlugin> extends CRaSHPlugin<T> {
032
033  public static Repository findRepository(Map<String, String> properties) throws Exception {
034    for (JCRPlugin plugin : ServiceLoader.load(JCRPlugin.class)) {
035      Repository repository = plugin.getRepository(properties);
036      if (repository != null) {
037        return repository;
038      }
039    }
040    return null;
041  }
042
043  public static Iterable<JCRPlugin> findRepositories() throws Exception {
044    return ServiceLoader.load(JCRPlugin.class);
045  }
046
047  /** . */
048  private static final Collection<String> NODES = Arrays.asList(
049      "org.exoplatform.services.jcr.impl.core.NodeImpl",
050      "org.apache.jackrabbit.core.NodeImpl", "org.apache.jackrabbit.rmi.client.ClientNode",
051      "org.apache.jackrabbit.rmi.server.ServerNode");
052
053  /** . */
054  private static final Object LOCK = new Object();
055
056  /** . */
057  private static boolean integrated = false;
058
059  public Collection<String> getNodeClassNames() {
060    return NODES;
061  }
062  
063  public abstract Repository getRepository(Map<String, String> properties) throws Exception;
064
065  public abstract String getName();
066
067  public abstract String getDisplayName();
068
069  public abstract String getUsage();
070
071  @Override
072  public void init() {
073    // Force integration of node meta class
074    NodeMetaClass.setup();
075    synchronized (LOCK) {
076      if (!integrated) {
077        try {
078          MetaClassRegistry registry = GroovySystem.getMetaClassRegistry();
079          Collection<Class<? extends Node>> nodes = loadAvailablesNodeImplementations(getNodeClassNames());
080          for (Class<? extends Node> nodeClass : nodes) {
081            registerNodeImplementation(registry, nodeClass);
082          }
083        } catch (IntrospectionException e) {
084          throw new RuntimeException(e);
085        }
086      }
087      integrated = true;
088    }
089  }
090
091  private Collection<Class<? extends Node>> loadAvailablesNodeImplementations(
092      Collection<String> classNames) {
093    List<Class<? extends Node>> classes = new ArrayList<Class<? extends Node>>(classNames.size());
094    for (String className : classNames) {
095      Class<? extends Node> nodeClass = loadNodeImplementation(className);
096      if (nodeClass != null) {
097        classes.add(nodeClass);
098      }
099    }
100    return classes;
101  }
102
103  private Class<? extends Node> loadNodeImplementation(String className) {
104    try {
105      return (Class<? extends Node>) Thread.currentThread().getContextClassLoader().loadClass(
106          className);
107    } catch (ClassNotFoundException e) {
108      return null;
109    }
110  }
111
112  private void registerNodeImplementation(MetaClassRegistry registry,
113      Class<? extends Node> nodeClass) throws IntrospectionException {
114    NodeMetaClass mc2 = new NodeMetaClass(registry, nodeClass);
115    mc2.initialize();
116    registry.setMetaClass(nodeClass, mc2);
117  }
118}