wifi

Class Transmission

java.lang.Object

wifi.Transmission

public class Transmission
extends java.lang.Object

This class contains the information available from an incoming transmission. In C, the recvfrom() call returns information about the source and destination address through parameters to the call, along with the incoming data itself. We can't do that in Java, so we'll use the same approach that the Java sockets libraries do: Our recv() call will take an object reference — a pointer to a Transmission instance — and will write the data and address information into the Transmission object.

Author:

richards

Constructor Summary

Constructors

Constructor and Description
Transmission(short sourceAddr, short destAddr, byte[] buf) Constructor for Transmission.

Method Summary

Modifier and Type	Method and Description
byte[]	getBuf() Returns a reference to the buffer held by the Transmission instance.
short	getDestAddr()
short	getSourceAddr()
void	setBuf(byte[] buf) Takes a reference to an array of bytes and sets it to be the buffer used by the Transmission instance.
void	setDestAddr(short destAddr)
void	setSourceAddr(short sourceAddr)

Methods inherited from class java.lang.Object

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

Constructor Detail

Transmission

public Transmission(short sourceAddr,
                    short destAddr,
                    byte[] buf)

Constructor for Transmission.

Parameters:

sourceAddr - The transmission's source address

destAddr - The transmission's destination address

buf - The data carried by the transmission

Method Detail

getBuf

public byte[] getBuf()

Returns a reference to the buffer held by the Transmission instance. Note that it does not return a copy of the buffer, it returns a link to the existing buffer.

Returns:

a reference to the data buffer

setBuf

public void setBuf(byte[] buf)

Takes a reference to an array of bytes and sets it to be the buffer used by the Transmission instance. Note that it does not copy buf, it links to it (shares it).

Parameters:

buf - the data buffer to set

getDestAddr

public short getDestAddr()

Returns:

the destination address

setDestAddr

public void setDestAddr(short destAddr)

Parameters:

destAddr - the destination address to set

getSourceAddr

public short getSourceAddr()

Returns:

the source address

setSourceAddr

public void setSourceAddr(short sourceAddr)

Parameters:

sourceAddr - the source address to set