Class HexNibblesPrefixer

java.lang.Object

org.jpos.iso.HexNibblesPrefixer

All Implemented Interfaces:

Prefixer

public class HexNibblesPrefixer
extends Object
implements Prefixer

HexNibblesPrefixer constructs a prefix storing the length in BCD.

Field Summary

Fields

Modifier and Type	Field	Description
static final HexNibblesPrefixer	LL	LL (2-digit hex nibbles) prefixer instance.
static final HexNibblesPrefixer	LLL	LLL (3-digit hex nibbles) prefixer instance.

Constructor Summary

Constructors

Constructor	Description
HexNibblesPrefixer(int nDigits)	Constructs a HexNibblesPrefixer with the given number of digits.

Method Summary

Modifier and Type	Method	Description
int	decodeLength(byte[] b, int offset)	Decodes an encoded length from the byte array.
void	encodeLength(int length, byte[] b)	Encodes the field length into the byte array.
int	getPackedLength()	Returns the number of bytes taken up by the length encoding.

Methods inherited from class Object

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

Field Details

LL

public static final HexNibblesPrefixer LL

LL (2-digit hex nibbles) prefixer instance.

LLL

public static final HexNibblesPrefixer LLL

LLL (3-digit hex nibbles) prefixer instance.

Constructor Details

HexNibblesPrefixer

public HexNibblesPrefixer(int nDigits)

Constructs a HexNibblesPrefixer with the given number of digits.

Parameters:

nDigits - number of hex nibble digits in the length prefix

Method Details

encodeLength

public void encodeLength(int length,
 byte[] b)

Description copied from interface: Prefixer

Encodes the field length into the byte array.

Specified by:

encodeLength in interface Prefixer

Parameters:

length - the field length to encode

b - the byte array to write the length prefix into

decodeLength

public int decodeLength(byte[] b,
 int offset)

Description copied from interface: Prefixer

Decodes an encoded length from the byte array.

Specified by:

decodeLength in interface Prefixer

Parameters:

b - the byte array containing the length prefix

offset - the offset in b where the prefix starts

Returns:

the length in chars of the field data to follow this prefix

getPackedLength

public int getPackedLength()

Description copied from interface: Prefixer

Returns the number of bytes taken up by the length encoding.

Specified by:

getPackedLength in interface Prefixer

Returns:

the number of bytes used by the length encoding