step.encoding
Class CreepIntEncoder

java.lang.Object
  |
  +--step.encoding.Encoder
        |
        +--step.encoding.CreepIntEncoder

public class CreepIntEncoder

extends Encoder

Encoder for STEP int types that uses a variable size encoding.

Values are encoded one byte at a time, using 7 bits for data and marking the high bit if more bytes should be read. The encoding is thus pseudo-LITTLE endian (least significant -> most significant), using 7 bit bytes.

The maximum number of bytes used by this encoding is 10, in signed mode: 9 (=63/7) for the 63 low bits plus one more to sign extend.

See Also:

StepInt, IntEncoder

Constructor Summary

CreepIntEncoder(String name, boolean unsigned, EncoderFactory factory)
Create a new encoder for STEP int types.

Method Summary

StepObject	decode(DecodeContext context) Decode a STEP int value.
void	dump(int level)
void	encode(StepObject o, EncodeContext context) Encode the given STEP int value.

Methods inherited from class step.encoding.Encoder

eventMessage, getFactory, getName, indent, makeFieldName

Methods inherited from class java.lang.Object

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

Constructor Detail

CreepIntEncoder

public CreepIntEncoder(String name,
                       boolean unsigned,
                       EncoderFactory factory)

Create a new encoder for STEP int types.

Parameters:

name - the name for this encoder.

unsigned - true if encoded/decoded values are always >= 0

factory - the EncoderFactory used to create this encoder

Method Detail

encode

public void encode(StepObject o,
                   EncodeContext context)
            throws EncoderException,
                   IOException

Encode the given STEP int value.

Specified by:

encode in class Encoder

Throws:

EncoderException - if

• the value was not a StepInt.
• a negative value was passed while the "unsigned" option was set.

IOException - if the encode operation encountered an I/O failure.

decode

public StepObject decode(DecodeContext context)
                  throws EncoderException,
                         IOException

Decode a STEP int value.

Specified by:

decode in class Encoder

Throws:

IOException - if the decode operation encountered an I/O failure.

EncoderException - if the decode operation encountered an error.

dump

public void dump(int level)

Specified by:

dump in class Encoder