message.java

移动Agent编程工具Naplet

/*
 * @<#>Message.java 0.0.1, 1/1/2000
 *
 * THIS PROGRAM IS FREE SOFTWARE; YOU CAN DISTRIBUTED IT AND/OR
 * MODIFY IT UNDER THE TERMS OF THE GNU GENERAL PUBLIC LICENSE 
 * AS PUBLISHED BY THE FREE SOFTWARE FOUNDATION.
 *
 * THIS PROGRAM IS DISTRIBUTED IN THE HOPE THAT IT WILL BE USEFUL,
 * BUT WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED WARRANTY OF
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. SEE THE 
 * GNU GENERAL PUBLIC LICENSE FOR MORE DETAILS.
 *
 * Copyright (c) 2000 Cheng-Zhong Xu. All Rights Reserved.
 */

package naplet.message;

import naplet.*;

/**
 * The <code>Message</code> class provides a wrapped message 
 * with an inclusion of sender and receiver identifiers.
 *
 * @version 0.0.1, 1/1/2000
 * @author C. Xu
 */

public class Message implements java.io.Serializable {
	public static final int USER = 0;
	public static final int TERMINATE = 1;
	public static final int TERMINATE_ACK = 2;
	public static final int SUSPEND = 3;
	public static final int SUSPEND_ACK = 4;
	public static final int RESUME = 5;
	public static final int RESUME_ACK = 6;
	public static final int RESTART = 7;
	public static final int RESTART_ACK = 8;
	
	private NapletID sender;
	private NapletID receiver;
	private int type;
	private String message;
	
	/**
	 * Constructor. Default message type is USER
	 * @param sendID NapletID of sender
	 * @param recvID NapletID of receiver
	 * @param msg	 Context of message
	 */ 
	public Message( NapletID sendID, NapletID recvID, String msg) {
		this(USER, sendID, recvID, msg);
	}
	
	/**
	 * Constructor
	 * @param type   Message type, MessageType.SYSTEM or USER
	 * @param sendID NapletID of sender
	 * @param recvID NapletID of receiver
	 * @param msg	 Context of message
	 */ 
	public Message( int type, NapletID sendID, NapletID recvID, String msg) {
	    this.type = type;
	    sender = sendID;
		receiver = recvID;
		message = msg;
	}

	public NapletID getSender() {return sender;}
	public NapletID getReceiver() {return receiver;}
	public String getMessage() { return message; }
	public int getType() { return type; }
}