content: /*
   * $Id $
   * 
   * This file is part of the MoSKito software project
   * that is hosted at http://moskito.dev.java.net.
   * 
   * All MoSKito files are distributed under MIT License:
   * 
   * Copyright (c) 2006-2007 The MoSKito Project Team.
   * 
   * Permission is hereby granted, free of charge,
   * to any person obtaining a copy of this software and
   * associated documentation files (the "Software"), 
   * to deal in the Software without restriction, 
   * including without limitation the rights to use,
   * copy, modify, merge, publish, distribute, sublicense,
   * and/or sell copies of the Software, and to permit 
   * persons to whom the Software is furnished to do so, 
   * subject to the following conditions:
   * 
   * The above copyright notice and this permission notice
   * shall be included in all copies 
   * or substantial portions of the Software.
   * 
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY
   * OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT 
   * LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
   * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 
   * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 
   * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 
   * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
   * THE USE OR OTHER DEALINGS IN THE SOFTWARE.
   */	
  package net.anotheria.moskito.core.command;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * An implementation of the command controller.
   * @author lrosenberg
   *
   */
  public enum CommandControllerImpl implements CommandController{
  	/**
  	 * The singleton instance.
  	 */
  	INSTANCE;
  	/**
  	 * Map with registered processors.
  	 */
  	private Map<String, CommandProcessor> processors;
  	/**
  	 * Logger instance.
  	 */
  	private static final Logger log = LoggerFactory.getLogger(CommandControllerImpl.class);
  	/**
  	 * Creates a new CommandControllerImpl.
  	 */
  	CommandControllerImpl() {
  		processors = new HashMap<>();
  	}
  	 
  	@Override public void registerCommandProcessor(String command, CommandProcessor processor) {
  		if (log!=null){
  			log.debug("registering processor: "+processor+" for command: "+command);
  		}else{
  			LoggerFactory.getLogger(CommandControllerImpl.class).debug("registering processor: "+processor+" for command: "+command);
  		}
  		CommandProcessor oldProcessor = processors.put(command, processor);
  		if (oldProcessor!=null) {
  			log.info("Implicitely unregistered processor: "+processor+" for command: "+command);
  		}
  		
  	}
  
  	//note, the second parameter is unneeded and should be removed. 
  	@Override public void unregisterCommandProcessor(String command, CommandProcessor processor) {
  		log.debug("unregistering processor: "+processor+" for command: "+command);
  		CommandProcessor oldProcessor = processors.remove(command);
  		if (oldProcessor==null)
  			log.info("Remove for command: "+command+" had no effect (no command previously registered)");
  	}
  
  	@Override public void startCommand(String command, Map<String, String[]> parameters) {
  		log.debug("startCommand("+command+", "+parameters+ ')');
  		CommandProcessor processor = processors.get(command);
  		if (processor==null)
  			return;
  		try{
  			processor.startCommand(command, parameters);
  		}catch(Exception e){
  			log.error("caught in startCommand("+command+", "+parameters+ ')', e);
  		}
  	}
  
  	@Override public void stopCommand(String command, Map<String, String[]> parameters) {
  		log.debug("stopCommand("+command+", "+parameters+ ')');
  		CommandProcessor processor = processors.get(command);
  		if (processor==null)
  			return;
  		try{
  			processor.stopCommand(command, parameters);
  		}catch(Exception e){
  			log.error("caught in stopCommand("+command+", "+parameters+ ')', e);
  		}
  	}
  
  
  }
  