xflow.util
Class HexUtil

java.lang.Object
  xflow.util.HexUtil

public class HexUtil

extends java.lang.Object

Field Summary

protected static byte[]

hexval The nibbles' hexadecimal values.

Constructor Summary

HexUtil()

Method Summary

protected static byte	decodeNibble(char c) Decodes a nibble.
static byte[]	hexDecode(java.lang.String s) Decodes the hexadecimal representation of a sequence of bytes into a byte array.
static java.lang.Object	hexDecodeObject(java.lang.String bytes)
static java.lang.String	hexEncode(byte b) Converts a single byte into its hexadecimal notation.
static java.lang.String	hexEncode(byte[] s) Converts a byte array into its hexadecimal notation.
static java.lang.String	hexEncode(byte[] s, int offset, int length) Converts a part of a byte array into its hexadecimal notation.
static java.lang.String	hexEncode(int i) Converts an int value (32-bit) into its hexadecimal notation.
static java.lang.String	hexEncode(long l) Converts a long value (64-bit) into its hexadecimal notation.
static java.lang.String	hexEncode(short s) Converts a short value (16-bit) into its hexadecimal notation.
static java.lang.String	hexEncode(java.lang.String s) Converts a string into its hexadecimal notation.
static java.lang.String	hexEncodeObject(java.lang.Object obj)
static void	main(java.lang.String[] args) For testing.

Methods inherited from class java.lang.Object

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

Field Detail

hexval

protected static final byte[] hexval

The nibbles' hexadecimal values. A nibble is a half byte.

Constructor Detail

HexUtil

public HexUtil()

Method Detail

hexEncode

public static java.lang.String hexEncode(java.lang.String s)

Converts a string into its hexadecimal notation.

FIXME: If this method is called frequently, it should directly implement the algorithm in the called method in order to avoid creating a string instance.

hexEncode

public static java.lang.String hexEncode(byte[] s)

Converts a byte array into its hexadecimal notation.

hexEncode

public static java.lang.String hexEncode(byte[] s,
                                         int offset,
                                         int length)

Converts a part of a byte array into its hexadecimal notation.

hexEncode

public static java.lang.String hexEncode(byte b)

Converts a single byte into its hexadecimal notation.

hexEncode

public static java.lang.String hexEncode(short s)

Converts a short value (16-bit) into its hexadecimal notation.

hexEncode

public static java.lang.String hexEncode(int i)

Converts an int value (32-bit) into its hexadecimal notation.

hexEncode

public static java.lang.String hexEncode(long l)

Converts a long value (64-bit) into its hexadecimal notation.

hexDecode

public static byte[] hexDecode(java.lang.String s)

Decodes the hexadecimal representation of a sequence of bytes into a byte array. Each character in the string represents a nibble (half byte) and must be one of the characters '0'-'9', 'A'-'F' or 'a'-'f'.

Parameters:

s - The string to be decoded

Returns:

The bytes

Throws:

java.lang.IllegalArgumentException - if the string does not contain a valid representation of a byte sequence.

decodeNibble

protected static byte decodeNibble(char c)

Decodes a nibble.

Parameters:

c - A character in the range '0'-'9' or 'A'-'F'. Lower case is not supported here.

Returns:

The decoded nibble in the range 0-15

Throws:

java.lang.IllegalArgumentException - if c is not a permitted character

hexEncodeObject

public static java.lang.String hexEncodeObject(java.lang.Object obj)

hexDecodeObject

public static java.lang.Object hexDecodeObject(java.lang.String bytes)

main

public static void main(java.lang.String[] args)
                 throws java.io.IOException

For testing.

Throws:

java.io.IOException