wifi

Class JavaGUIAdapter

java.lang.Object

wifi.JavaGUIAdapter

All Implemented Interfaces:

GUIClientInterface

public class JavaGUIAdapter
extends java.lang.Object
implements GUIClientInterface

This class acts as a thin layer between the GUI client code and the Java-based 802.11~ layer. (There's a similar layer that mediates between the Java GUI code and a C++ implementation of the 802.11~ project.) See GUIClientInterface for full descriptions of these routines.

Author:

richards

Constructor Summary

Constructors

Constructor and Description
JavaGUIAdapter()

Method Summary

Modifier and Type	Method and Description
short[]	getDefaultAddrs() An array of addresses to use for the "send" buttons in the GUI.
int	initializeLinkLayer(short MACaddr) Create an instance of the 802.11~ layer.
byte[]	pollForStreamOutput() This routine pulls text from the stream to which the 802.11~ layer is writing and returns any new text as an array of bytes.
byte[]	pollForStreamOutput2()
int	sendCommand(int command, int value) The GUI calls this when the user asks to pass command info to the 802.11~ layer.
int	sendOutgoingData(short dest, byte[] payload) Wrapper around the 802.11~ layer's send routine.
byte[]	watchForIncomingData() This method calls the 802.11~ layer's recv() method, which should block until data arrives.

Methods inherited from class java.lang.Object

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

Constructor Detail

JavaGUIAdapter

public JavaGUIAdapter()

Method Detail

getDefaultAddrs

public short[] getDefaultAddrs()

An array of addresses to use for the "send" buttons in the GUI.

Specified by:

getDefaultAddrs in interface GUIClientInterface

Returns:

An array of MAC addresses assigned to buttons by the GUI.

initializeLinkLayer

public int initializeLinkLayer(short MACaddr)

Create an instance of the 802.11~ layer. It wraps a PrintWriter around a BufferedReader that's wrapped around a CircularByteBuffer (whew!) so that we can read the text that the 802.11~ layer writes to the stream and display it in the GUI's window.

Specified by:

initializeLinkLayer in interface GUIClientInterface

Parameters:

MACaddr - The MAC address passed to the 802.11~ constructor.

Returns:

Returns 0 on success, -1 if an error occurs.

watchForIncomingData

public byte[] watchForIncomingData()

This method calls the 802.11~ layer's recv() method, which should block until data arrives. It then builds an array of bytes consisting of the the sender's MAC address followed by the data from the recv() call. (This may seem odd, but the approach is easy to support on both the C++ and Java side.)

Specified by:

watchForIncomingData in interface GUIClientInterface

Returns:

An array of bytes containing MAC addresses and data

sendOutgoingData

public int sendOutgoingData(short dest,
                            byte[] payload)

Wrapper around the 802.11~ layer's send routine.

Specified by:

sendOutgoingData in interface GUIClientInterface

Parameters:

dest - The destination MAC address

payload - The data to send

Returns:

Returns the value returned by the linklayer's send() method.

pollForStreamOutput

public byte[] pollForStreamOutput()

This routine pulls text from the stream to which the 802.11~ layer is writing and returns any new text as an array of bytes.

Specified by:

pollForStreamOutput in interface GUIClientInterface

Returns:

An array of bytes representing characters sent to output stream since last call.

pollForStreamOutput2

public byte[] pollForStreamOutput2()

sendCommand

public int sendCommand(int command,
                       int value)

The GUI calls this when the user asks to pass command info to the 802.11~ layer.

Specified by:

sendCommand in interface GUIClientInterface

Parameters:

command - Specifies the command to send

value - The value passed with the command

Returns:

Returns the value returned by the linklayer's command() method.