org.xlattice.protocol
Class TLV

java.lang.Object
  org.xlattice.protocol.TLV

Direct Known Subclasses:

TLV16

public abstract class TLV
extends java.lang.Object

Represents the classic Type-Length-Value field found in many network protocols. This is an experiment; the implementation may change drastically at a later date.

Author:

Jim Dixon

Field Summary

int	fieldSize
int	type
byte[]	value

Constructor Summary

protected	TLV(int fieldSize, int type, byte[] value)
protected	TLV(int fieldSize, int type, int length, byte[] value)

Method Summary

protected static TLV	decode(int fieldSize, byte[] message, int offset)
int	encode(byte[] message, int offset) Write this TLV onto the message buffer at the offset indicated.
int	length()

Methods inherited from class java.lang.Object

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

Field Detail

fieldSize

public final int fieldSize

type

public final int type

value

public final byte[] value

Constructor Detail

TLV

protected TLV(int fieldSize,
              int type,
              int length,
              byte[] value)

TLV

protected TLV(int fieldSize,
              int type,
              byte[] value)

Method Detail

length

public int length()

decode

protected static TLV decode(int fieldSize,
                            byte[] message,
                            int offset)
                     throws java.io.IOException

Throws:

java.io.IOException

encode

public int encode(byte[] message,
                  int offset)

Write this TLV onto the message buffer at the offset indicated. XXX Assumes value.length == length

Parameters:

message - buffer to write TLV on

offset - byte offset where we start writing

Returns:

offset after writing the values

Throws:

IndexOutOfBoundsException, - NullPointerException