josx.rcxcomm
Class LNPIntegrityHandler

java.lang.Object
  josx.rcxcomm.PacketHandler
      josx.rcxcomm.LNPIntegrityHandler

public class LNPIntegrityHandler

extends PacketHandler

Packet handler that implements simple checksums. The checksum is added at the end and is not part of the packet length

Field Summary

Fields inherited from class josx.rcxcomm.PacketHandler

lowerHandler

Constructor Summary

LNPIntegrityHandler(PacketHandler handler, byte op)
Create a packet handler for broadcast or addressing integrity packets

Method Summary

boolean	isAddressing() Test if last packet is an adressing (or integrity) packet
boolean	isPacketAvailable() Check if a packet is available
int	receivePacket(byte[] buffer) Receive a packet.
boolean	sendPacket(byte[] packet, int len) Send a packet.
void	setOp(byte op) Set the opcode for the next write

Methods inherited from class josx.rcxcomm.PacketHandler

close, getError, isAckAvailable, open, receiveAck, reset, setListen

Methods inherited from class java.lang.Object

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

Constructor Detail

LNPIntegrityHandler

public LNPIntegrityHandler(PacketHandler handler,
                           byte op)

Create a packet handler for broadcast or addressing integrity packets

Parameters:

handler - the lower level LNP packet handler

op - the opcode to use for writes: 0xf0 for broadcasts, 0xf1 for addressing packets

Method Detail

isAddressing

public boolean isAddressing()

Test if last packet is an adressing (or integrity) packet

Returns:

true if addressing packet, false if a broadcast

setOp

public void setOp(byte op)

Set the opcode for the next write

Parameters:

op - oxf0 for a broadcast, oxf1 for an adressing write

sendPacket

public boolean sendPacket(byte[] packet,
                          int len)

Send a packet.

Specified by:

sendPacket in class PacketHandler

Parameters:

packet - the bytes to send

len - the number of bytes to send

Returns:

true if the send was successful, else false

receivePacket

public int receivePacket(byte[] buffer)

Receive a packet.

Specified by:

receivePacket in class PacketHandler

Parameters:

buffer - the buffer to receive the packet into

Returns:

the number of bytes received

isPacketAvailable

public boolean isPacketAvailable()

Check if a packet is available

Specified by:

isPacketAvailable in class PacketHandler

Returns:

true if a Packet is available, else false