org.apache.cayenne.util
Class IDUtil

java.lang.Object
  org.apache.cayenne.util.IDUtil

public class IDUtil
extends java.lang.Object

helper class to generate pseudo-GUID sequences.

Author:

Andrus Adamchik

Method Summary

static void	appendFormattedByte(java.lang.StringBuffer buffer, byte byteValue) Prints a byte value to a StringBuffer as a double digit hex value.
static byte[]	pseudoUniqueByteSequence(int length)
static byte[]	pseudoUniqueByteSequence16()
static byte[]	pseudoUniqueByteSequence8()
static byte[]	pseudoUniqueSecureByteSequence(int length)
static byte[]	pseudoUniqueSecureByteSequence16()

Methods inherited from class java.lang.Object

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

Method Detail

appendFormattedByte

public static void appendFormattedByte(java.lang.StringBuffer buffer,
                                       byte byteValue)

Prints a byte value to a StringBuffer as a double digit hex value.

Since:

1.2

pseudoUniqueByteSequence

public static byte[] pseudoUniqueByteSequence(int length)

Parameters:

length - the length of returned byte[]

Returns:

A pseudo-unique byte array of the specified length. Length must be at least 16 bytes, or an exception is thrown.

Since:

1.0.2

pseudoUniqueSecureByteSequence

public static byte[] pseudoUniqueSecureByteSequence(int length)

pseudoUniqueByteSequence8

public static final byte[] pseudoUniqueByteSequence8()

pseudoUniqueByteSequence16

public static final byte[] pseudoUniqueByteSequence16()

Returns:

A pseudo unique 16-byte array.

pseudoUniqueSecureByteSequence16

public static byte[] pseudoUniqueSecureByteSequence16()

Returns:

A pseudo unique digested 16-byte array.