Class EmulatorPacket

java.lang.Object
  EmulatorPacket

public class EmulatorPacket
extends java.lang.Object

Packet used by emulated nodes to send data to each other via UDP

Field Summary

static int	HEADER_SIZE
static int	MAX_PACKET_SIZE

Constructor Summary

EmulatorPacket(int destAddr, int srcAddr, byte[] payload)
Constructing a new packet

Method Summary

int	getDest() Get the address of the destination node
byte[]	getPayload() Get the payload
int	getSrc() Get the address of the source node
byte[]	pack() Convert packet into byte[] for sending over UDP Socket Format: destination address: 8 bits source address: 8 bits packet length: 8 bits payload: <= (MAX_PACKET_SIZE - HEADER_SIZE) bytes
java.lang.String	toString() Return a string representation of this packet
static EmulatorPacket	unpack(byte[] packet) Unpacks a byte array to create a EmulatorPacket object Assumes the array has been formatted using pack method

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

HEADER_SIZE

public static int HEADER_SIZE

MAX_PACKET_SIZE

public static int MAX_PACKET_SIZE

Constructor Detail

EmulatorPacket

public EmulatorPacket(int destAddr,
                      int srcAddr,
                      byte[] payload)
               throws java.lang.IllegalArgumentException

Constructing a new packet

Parameters:

destAddr - The fishnet address of the destination node

srcAddr - The fishnet address of the source node

payload - The payload of the packet

Throws:

java.lang.IllegalArgumentException - If the size of the payload is too big

Method Detail

getDest

public int getDest()

Get the address of the destination node

Returns:

The address of the destination node

getSrc

public int getSrc()

Get the address of the source node

Returns:

The address of the source node

getPayload

public byte[] getPayload()

Get the payload

Returns:

The payload

toString

public java.lang.String toString()

Return a string representation of this packet

Overrides:

toString in class java.lang.Object

Returns:

A string representation of this packet

pack

public byte[] pack()

Convert packet into byte[] for sending over UDP Socket Format: destination address: 8 bits source address: 8 bits packet length: 8 bits payload: <= (MAX_PACKET_SIZE - HEADER_SIZE) bytes

Returns:

A byte[] for sending over UDP

unpack

public static EmulatorPacket unpack(byte[] packet)

Unpacks a byte array to create a EmulatorPacket object Assumes the array has been formatted using pack method

Parameters:

packet - String representation of the packet

Returns:

EmulatorPacket object created or null if the byte[] representation was corrupted