routerlocationentry.java

使用Java语言编写模拟路由器程序

/* File: RouterLocationEntry.java
 *
 * Author: Venkata Sastry Malladi
 *
 * This file contains the code for the class RouterLocationEntry,
 * which represents and entry in the Router Location File
 *
 * Preferred Editor: emacs
 */
import java.net.*;

class RouterLocationEntry {
	// the IP address of the router
	InetAddress ip;

	// the port used to listen to the commands from the Command program
	int commandPort;

	// the port used to listen to the distance vector packets sent by the other
	// routers
	int routerPort;

	// the id of the router
	int routerId;

	/*
	 * Constructor
	 * 
	 * Use: To initialize the entry
	 * 
	 * @i: the IP address of the router @c: the command port @r: the router port
	 * @id: the router id
	 */
	public RouterLocationEntry(InetAddress i, int c, int r, int id) {
		ip = i;
		commandPort = c;
		routerPort = r;
		routerId = id;
	}

	/*
	 * Method Name: getIp()
	 * 
	 * Use: To return the IP address of this entry/router
	 */
	InetAddress getIp() {
		return ip;
	}

	/*
	 * Method Name: getCommandPort
	 * 
	 * Use: To return the command port of this entry/router
	 */
	int getCommandPort() {
		return commandPort;
	}

	/*
	 * Method Name: getRouterPort
	 * 
	 * Use: To return the router port of this entry/router
	 */
	int getRouterPort() {
		return routerPort;
	}

	/*
	 * Method Name: getRouterId
	 * 
	 * Use: To return the id of this entry/router
	 */
	int getRouterId() {
		return routerId;
	}

	/*
	 * Method Name: equals
	 * 
	 * @rle: another RouterLocationEntry object
	 * 
	 * Use: Used to find out whether there are any duplicate entries in the
	 * table
	 */
	boolean equals(RouterLocationEntry rle) {
		return (rle.routerId == routerId);
	}

	/*
	 * Method Name: toString
	 * 
	 * Use: To get a textual representation of the entry
	 */
	public String toString() {
		return ("(" + ip + "," + commandPort + "," + routerPort + ","
				+ routerId + ")");
	}
}