org.h2.util

Class Bits

java.lang.Object

org.h2.util.Bits

public final class Bits
extends java.lang.Object

Manipulations with bytes and arrays. This class can be overridden in multi-release JAR with more efficient implementation for a newer versions of Java.

Method Summary

Methods

Modifier and Type	Method and Description
static int	compareNotNull(char[] data1, char[] data2) Compare the contents of two char arrays.
static int	compareNotNullSigned(byte[] data1, byte[] data2) Compare the contents of two byte arrays.
static int	compareNotNullUnsigned(byte[] data1, byte[] data2) Compare the contents of two byte arrays.
static double	readDouble(byte[] buff, int pos) Reads a double value from the byte array at the given position in big-endian order.
static double	readDoubleLE(byte[] buff, int pos) Reads a double value from the byte array at the given position in little-endian order.
static int	readInt(byte[] buff, int pos) Reads a int value from the byte array at the given position in big-endian order.
static int	readIntLE(byte[] buff, int pos) Reads a int value from the byte array at the given position in little-endian order.
static long	readLong(byte[] buff, int pos) Reads a long value from the byte array at the given position in big-endian order.
static long	readLongLE(byte[] buff, int pos) Reads a long value from the byte array at the given position in little-endian order.
static byte[]	uuidToBytes(long msb, long lsb) Converts UUID value to byte array in big-endian order.
static byte[]	uuidToBytes(java.util.UUID uuid) Converts UUID value to byte array in big-endian order.
static void	writeDouble(byte[] buff, int pos, double x) Writes a double value to the byte array at the given position in big-endian order.
static void	writeDoubleLE(byte[] buff, int pos, double x) Writes a double value to the byte array at the given position in little-endian order.
static void	writeInt(byte[] buff, int pos, int x) Writes a int value to the byte array at the given position in big-endian order.
static void	writeIntLE(byte[] buff, int pos, int x) Writes a int value to the byte array at the given position in little-endian order.
static void	writeLong(byte[] buff, int pos, long x) Writes a long value to the byte array at the given position in big-endian order.
static void	writeLongLE(byte[] buff, int pos, long x) Writes a long value to the byte array at the given position in little-endian order.

Methods inherited from class java.lang.Object

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

Method Detail

compareNotNull

public static int compareNotNull(char[] data1,
                 char[] data2)

Compare the contents of two char arrays. If the content or length of the first array is smaller than the second array, -1 is returned. If the content or length of the second array is smaller than the first array, 1 is returned. If the contents and lengths are the same, 0 is returned.

Parameters:

data1 - the first char array (must not be null)

data2 - the second char array (must not be null)

Returns:

the result of the comparison (-1, 1 or 0)

compareNotNullSigned

public static int compareNotNullSigned(byte[] data1,
                       byte[] data2)

Compare the contents of two byte arrays. If the content or length of the first array is smaller than the second array, -1 is returned. If the content or length of the second array is smaller than the first array, 1 is returned. If the contents and lengths are the same, 0 is returned.

This method interprets bytes as signed.

Parameters:

data1 - the first byte array (must not be null)

data2 - the second byte array (must not be null)

Returns:

the result of the comparison (-1, 1 or 0)

compareNotNullUnsigned

public static int compareNotNullUnsigned(byte[] data1,
                         byte[] data2)

Compare the contents of two byte arrays. If the content or length of the first array is smaller than the second array, -1 is returned. If the content or length of the second array is smaller than the first array, 1 is returned. If the contents and lengths are the same, 0 is returned.

This method interprets bytes as unsigned.

Parameters:

data1 - the first byte array (must not be null)

data2 - the second byte array (must not be null)

Returns:

the result of the comparison (-1, 1 or 0)

readInt

public static int readInt(byte[] buff,
          int pos)

Reads a int value from the byte array at the given position in big-endian order.

Parameters:

buff - the byte array

pos - the position

Returns:

the value

readIntLE

public static int readIntLE(byte[] buff,
            int pos)

Reads a int value from the byte array at the given position in little-endian order.

Parameters:

buff - the byte array

pos - the position

Returns:

the value

readLong

public static long readLong(byte[] buff,
            int pos)

Reads a long value from the byte array at the given position in big-endian order.

Parameters:

buff - the byte array

pos - the position

Returns:

the value

readLongLE

public static long readLongLE(byte[] buff,
              int pos)

Reads a long value from the byte array at the given position in little-endian order.

Parameters:

buff - the byte array

pos - the position

Returns:

the value

readDouble

public static double readDouble(byte[] buff,
                int pos)

Reads a double value from the byte array at the given position in big-endian order.

Parameters:

buff - the byte array

pos - the position

Returns:

the value

readDoubleLE

public static double readDoubleLE(byte[] buff,
                  int pos)

Reads a double value from the byte array at the given position in little-endian order.

Parameters:

buff - the byte array

pos - the position

Returns:

the value

uuidToBytes

public static byte[] uuidToBytes(long msb,
                 long lsb)

Converts UUID value to byte array in big-endian order.

Parameters:

msb - most significant part of UUID

lsb - least significant part of UUID

Returns:

byte array representation

uuidToBytes

public static byte[] uuidToBytes(java.util.UUID uuid)

Converts UUID value to byte array in big-endian order.

Parameters:

uuid - UUID value

Returns:

byte array representation

writeInt

public static void writeInt(byte[] buff,
            int pos,
            int x)

Writes a int value to the byte array at the given position in big-endian order.

Parameters:

buff - the byte array

pos - the position

x - the value to write

writeIntLE

public static void writeIntLE(byte[] buff,
              int pos,
              int x)

Writes a int value to the byte array at the given position in little-endian order.

Parameters:

buff - the byte array

pos - the position

x - the value to write

writeLong

public static void writeLong(byte[] buff,
             int pos,
             long x)

Writes a long value to the byte array at the given position in big-endian order.

Parameters:

buff - the byte array

pos - the position

x - the value to write

writeLongLE

public static void writeLongLE(byte[] buff,
               int pos,
               long x)

Writes a long value to the byte array at the given position in little-endian order.

Parameters:

buff - the byte array

pos - the position

x - the value to write

writeDouble

public static void writeDouble(byte[] buff,
               int pos,
               double x)

Writes a double value to the byte array at the given position in big-endian order.

Parameters:

buff - the byte array

pos - the position

x - the value to write

writeDoubleLE

public static void writeDoubleLE(byte[] buff,
                 int pos,
                 double x)

Writes a double value to the byte array at the given position in little-endian order.

Parameters:

buff - the byte array

pos - the position

x - the value to write