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/*
 * jabsorb - a Java to JavaScript Advanced Object Request Broker
 * http://www.jabsorb.org
 *
 * Copyright 2007-2009 The jabsorb team
 *
 * based on original code from
 * JSON-RPC-Client, a Java client extension to JSON-RPC-Java
 * (C) Copyright CodeBistro 2007, Sasha Ovsankin 
 *
 * 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 org.jabsorb.client;

import java.net.URI;
import java.util.HashMap;

/**
 * A registry of transports serving JSON-RPC-Client
 */
public class TransportRegistry
{

  private static TransportRegistry singleton;

  public TransportRegistry()
  {
  }

  /**
   * Use this function when there is no IOC container to rely on creating the
   * factory.
   * 
   * @return singleton instance of the class, created if necessary.
   */
  public synchronized static TransportRegistry i()
  {
    if (singleton == null)
    {
      singleton = new TransportRegistry();
    }
    return singleton;
  }

  /**
   * Downgrading to Java 1.4: manual specialization of HashMap
   */
  static class RegistryMap
  {
    HashMap rep;

    public RegistryMap()
    {
      rep = new HashMap();
    }

    public SessionFactory get(String key)
    {
      return (SessionFactory) rep.get(key);
    }

    public SessionFactory put(String key, SessionFactory value)
    {
      return (SessionFactory) rep.put(key, value);
    }
  }

  private RegistryMap registry = new RegistryMap();

  /**
   * A factory used to create transport sessions. 
   * Register with #registerTransport.
   */
  public interface SessionFactory
  {
    /**
     * @param uri
     *          URI used to open this session
     */
    Session newSession(URI uri);
  }

  public void registerTransport(String scheme, SessionFactory factory)
  {
    registry.put(scheme, factory);
  }

  /**
   * Create a session from 'uriString' using one of registered transports.
   */
  public Session createSession(String uriString)
  {
    try
    {
      URI uri = new URI(uriString);
      SessionFactory found = registry.get(uri.getScheme());
      if (found != null)
      {
        return found.newSession(uri);
      }
      else
      {
        // Fallback
        return new URLConnectionSession(uri.toURL());
      }
    }
    catch (Exception e)
    {
      throw new ClientError(e);
    }
  }

}