clearreactor.java

简单的会议议程系统,展示了Command 模式的应用

/*
 * @(#)ClearReactor.java        2006/11/13
 *
 * Copyright (c) ZhiYang.
 * All rights reserved.
*/

package his; // HIS: Human Interactive Service
import agenda.*;

/**
 * 会议反应器：清除某一用户会议记录
 * @version 1.0
 * @author 杨智 (MSE2006B-06250145)
 *
 */

public class ClearReactor extends MeetingReactor  {
	
	ClearReactor(){
		super("clear");
	}
	public String name;

	/*
	 * do register
	 * @params String array
	 * ******* String username;
	 * ******* String password;
	*/
	public boolean doit ( Object[] params, UIMessager msgr ) {
		try {
			User aUser = new User( (String)params[0],(String)params[1]) ;
			if( !umgr.validateUser( aUser) ) {
				msgr.println("invalid username or password!");
				return false;				
			}
			mmgr.clearMeeting ( aUser.name );
			msgr.println("clear all the " + aUser.name + "'s meeting records");
			return true;		
		}							
		catch ( Exception e ) {
			msgr.println( "clear failed: " + e.getMessage() );
		}
		return false;
	}
	
	/*
	 * only need two strings
	*/
	public Object[] parseParameters( String[] params ){
		if( null==params || params.length!=2 )
			return null;
		User aUser = new User( params[0], params[1] );
		if( !aUser.isValid() )
			return null;
		Object[] ret = new Object[2];
		ret[0] = new String ( params[0] );
		ret[1] = new String ( params[1] );
		return ret;
	}
	
	/*
	 * print Usage
	*/
	public void printUsage( UIMessager msger ) {
		msger.println("Usage: ");
		msger.println("\tclear userName password");
		msger.println("Ex:\tclear su2 su2pwd");
	}

}