org.apache.commons.id
Class Hex

java.lang.Object
  org.apache.commons.id.Hex

public class Hex
extends java.lang.Object

Hex encoder and decoder.

Since:

1.1

Version:

$Id: Hex.java 480488 2006-11-29 08:57:26Z bayard $

Author:

Apache Software Foundation

Constructor Summary

Hex()

Method Summary

byte[]	decode(byte[] array) Converts an array of character bytes representing hexidecimal values into an array of bytes of those same values.
java.lang.Object	decode(java.lang.Object object) Converts a String or an array of character bytes representing hexidecimal values into an array of bytes of those same values.
static byte[]	decodeHex(char[] data) Converts an array of characters representing hexidecimal values into an array of bytes of those same values.
byte[]	encode(byte[] array) Converts an array of bytes into an array of bytes for the characters representing the hexidecimal values of each byte in order.
java.lang.Object	encode(java.lang.Object object) Converts a String or an array of bytes into an array of characters representing the hexidecimal values of each byte in order.
static char[]	encodeHex(byte[] data) Converts an array of bytes into an array of characters representing the hexidecimal values of each byte in order.
protected static int	toDigit(char ch, int index) Converts a hexadecimal character to an integer.

Methods inherited from class java.lang.Object

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

Constructor Detail

Hex

public Hex()

Method Detail

decodeHex

public static byte[] decodeHex(char[] data)
                        throws DecoderException

Converts an array of characters representing hexidecimal values into an array of bytes of those same values. The returned array will be half the length of the passed array, as it takes two characters to represent any given byte. An exception is thrown if the passed char array has an odd number of elements.

Parameters:

data - An array of characters containing hexidecimal digits

Returns:

A byte array containing binary data decoded from the supplied char array.

Throws:

DecoderException - Thrown if an odd number or illegal of characters is supplied

toDigit

protected static int toDigit(char ch,
                             int index)
                      throws DecoderException

Converts a hexadecimal character to an integer.

Parameters:

ch - A character to convert to an integer digit

index - The index of the character in the source

Returns:

An integer

Throws:

DecoderException - Thrown if ch is an illegal hex character

encodeHex

public static char[] encodeHex(byte[] data)

Converts an array of bytes into an array of characters representing the hexidecimal values of each byte in order. The returned array will be double the length of the passed array, as it takes two characters to represent any given byte.

Parameters:

data - a byte[] to convert to Hex characters

Returns:

A char[] containing hexidecimal characters

decode

public byte[] decode(byte[] array)
              throws DecoderException

Converts an array of character bytes representing hexidecimal values into an array of bytes of those same values. The returned array will be half the length of the passed array, as it takes two characters to represent any given byte. An exception is thrown if the passed char array has an odd number of elements.

Parameters:

array - An array of character bytes containing hexidecimal digits

Returns:

A byte array containing binary data decoded from the supplied byte array (representing characters).

Throws:

DecoderException - Thrown if an odd number of characters is supplied to this function

See Also:

decodeHex(char[])

decode

public java.lang.Object decode(java.lang.Object object)
                        throws DecoderException

Converts a String or an array of character bytes representing hexidecimal values into an array of bytes of those same values. The returned array will be half the length of the passed String or array, as it takes two characters to represent any given byte. An exception is thrown if the passed char array has an odd number of elements.

Parameters:

object - A String or, an array of character bytes containing hexidecimal digits

Returns:

A byte array containing binary data decoded from the supplied byte array (representing characters).

Throws:

DecoderException - Thrown if an odd number of characters is supplied to this function or the object is not a String or char[]

See Also:

decodeHex(char[])

encode

public byte[] encode(byte[] array)

Converts an array of bytes into an array of bytes for the characters representing the hexidecimal values of each byte in order. The returned array will be double the length of the passed array, as it takes two characters to represent any given byte.

Parameters:

array - a byte[] to convert to Hex characters

Returns:

A byte[] containing the bytes of the hexidecimal characters

See Also:

encodeHex(byte[])

encode

public java.lang.Object encode(java.lang.Object object)
                        throws EncoderException

Converts a String or an array of bytes into an array of characters representing the hexidecimal values of each byte in order. The returned array will be double the length of the passed String or array, as it takes two characters to represent any given byte.

Parameters:

object - a String, or byte[] to convert to Hex characters

Returns:

A char[] containing hexidecimal characters

Throws:

EncoderException - Thrown if the given object is not a String or byte[]

See Also:

encodeHex(byte[])