org.apache.openjpa.lib.util

Class Bytes

java.lang.Object

org.apache.openjpa.lib.util.Bytes

public final class Bytes
extends Object

This class came from the Apache Commons Id sandbox project in support of the UUIDGenerator implementation.

Static methods for managing byte arrays (all methods follow Big Endian order where most significant bits are in front).

Method Summary

Modifier and Type	Method and Description
static byte[]	append(byte[] a, byte[] b) Appends two bytes array into one.
static boolean	areEqual(byte[] a, byte[] b) Compares two byte arrays for equality.
static int	compareTo(byte[] lhs, byte[] rhs) Compares two byte arrays as specified by Comparable.
static byte[]	toBytes(long n) Returns a 8-byte array built from a long.
static byte[]	toBytes(long n, byte[] b) Build a 8-byte array from a long.
static long	toLong(byte[] b) Build a long from first 8 bytes of the array.
static short	toShort(byte[] b) Build a short from first 2 bytes of the array.

Methods inherited from class java.lang.Object

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

Method Detail

append

public static byte[] append(byte[] a,
                            byte[] b)

Appends two bytes array into one.

Parameters:

a - A byte[].

b - A byte[].

Returns:

A byte[].

toBytes

public static byte[] toBytes(long n)

Returns a 8-byte array built from a long.

Parameters:

n - The number to convert.

Returns:

A byte[].

toBytes

public static byte[] toBytes(long n,
                             byte[] b)

Build a 8-byte array from a long. No check is performed on the array length.

Parameters:

n - The number to convert.

b - The array to fill.

Returns:

A byte[].

toLong

public static long toLong(byte[] b)

Build a long from first 8 bytes of the array.

Parameters:

b - The byte[] to convert.

Returns:

A long.

areEqual

public static boolean areEqual(byte[] a,
                               byte[] b)

Compares two byte arrays for equality.

Parameters:

a - A byte[].

b - A byte[].

Returns:

True if the arrays have identical contents.

compareTo

public static int compareTo(byte[] lhs,
                            byte[] rhs)

Compares two byte arrays as specified by Comparable.

Parameters:

lhs - - left hand value in the comparison operation.

rhs - - right hand value in the comparison operation.

Returns:

a negative integer, zero, or a positive integer as lhs is less than, equal to, or greater than rhs.

toShort

public static short toShort(byte[] b)

Build a short from first 2 bytes of the array.

Parameters:

b - The byte[] to convert.

Returns:

A short.