/**

  * Licensed to the Apache Software Foundation (ASF) under one or more

  * contributor license agreements.  See the NOTICE file distributed with

  * this work for additional information regarding copyright ownership.

  * The ASF licenses this file to You 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.apache.xbean.command;

 import java.util.HashMap;

 import java.util.Iterator;

 import java.util.Map;

 public class CommandRegistry {

     protected static final HashMap commands = new HashMap();

     static {

         loadCommandList();

     }

     protected static final CommandRegistry unknownCommand = new CommandRegistry();

     public static Map getCommandMap() {

         HashMap rc = new HashMap();

         for (Iterator iter = commands.keySet().iterator(); iter.hasNext();) {

             String name = (String) iter.next();

             Command command = getCommand(name);

             rc.put(name, command);

         }

         return rc;

     }

     public static void register(String name, Command cmd) {

         commands.put(name, cmd);

     }

     public static void register(String name, Class cmd) {

         commands.put(name, cmd);

     }

     public static Command getCommand(String name) {

         Object cmd = commands.get(name);

         if (cmd instanceof Class) {

             cmd = loadCommand((Class) cmd);

             register(name, (Command) cmd);

         }

         return (Command) cmd;

     }

     // - Protected methods - //

     protected static Command loadCommand(Class commandClass) {

         Command cmd = null;

         try {

             cmd = (Command) commandClass.newInstance();

         } catch (Exception e) {

             //throw new IOException("Cannot instantiate command class "+commandClass+"\n"+e.getClass().getName()+":\n"+e.getMessage());

         }

         return cmd;

     }

     /**

      * TODO: Replace this part with the classpath magic

      */

     protected static void loadCommandList() {

         Exit.register();

         Help.register();

         Lookup.register();

         Version.register();

         GroovySh.register();

     }

 }