001/** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.xbean.command; 018 019import java.util.HashMap; 020import java.util.Iterator; 021import java.util.Map; 022 023public class CommandRegistry { 024 025 protected static final HashMap commands = new HashMap(); 026 027 static { 028 loadCommandList(); 029 } 030 031 protected static final CommandRegistry unknownCommand = new CommandRegistry(); 032 033 public static Map getCommandMap() { 034 HashMap rc = new HashMap(); 035 for (Iterator iter = commands.keySet().iterator(); iter.hasNext();) { 036 String name = (String) iter.next(); 037 Command command = getCommand(name); 038 rc.put(name, command); 039 } 040 return rc; 041 } 042 043 public static void register(String name, Command cmd) { 044 commands.put(name, cmd); 045 } 046 047 public static void register(String name, Class cmd) { 048 commands.put(name, cmd); 049 } 050 051 public static Command getCommand(String name) { 052 Object cmd = commands.get(name); 053 if (cmd instanceof Class) { 054 cmd = loadCommand((Class) cmd); 055 register(name, (Command) cmd); 056 } 057 return (Command) cmd; 058 } 059 060 061 // - Protected methods - // 062 protected static Command loadCommand(Class commandClass) { 063 Command cmd = null; 064 try { 065 cmd = (Command) commandClass.newInstance(); 066 } catch (Exception e) { 067 //throw new IOException("Cannot instantiate command class "+commandClass+"\n"+e.getClass().getName()+":\n"+e.getMessage()); 068 } 069 return cmd; 070 } 071 072 /** 073 * TODO: Replace this part with the classpath magic 074 */ 075 protected static void loadCommandList() { 076 Exit.register(); 077 Help.register(); 078 Lookup.register(); 079 Version.register(); 080 GroovySh.register(); 081 } 082}