com.alexkasko.unsafe.bytearray

Class UnsafeByteArrayTool

java.lang.Object

com.alexkasko.unsafe.bytearray.ByteArrayTool

com.alexkasko.unsafe.bytearray.UnsafeByteArrayTool

 class UnsafeByteArrayTool
extends ByteArrayTool

Implementation of ByteArrayTool using sun.misc.Unsafe. All bound checks are done using assert keyword, they may be enabled with java ea switch.

Author:

alexkasko Date: 12/11/12

Field Summary

Fields

Modifier and Type	Field and Description
private static long	BYTE_ARRAY_OFFSET
private static sun.misc.Unsafe	UNSAFE

Constructor Summary

Constructors

Constructor and Description
UnsafeByteArrayTool()

Method Summary

Methods

Modifier and Type	Method and Description
void	copy(byte[] src, int srcPos, byte[] dest, int destPos, int length) Copies part of one array into another.
byte	getByte(byte[] data, int offset) Gets byte
int	getInt(byte[] data, int offset) Gets four bytes as int
long	getLong(byte[] data, int offset) Gets long
short	getShort(byte[] data, int offset) Gets two bytes as short
short	getUnsignedByte(byte[] data, int offset) Gets one byte (stored as one signed byte), converts it to unsigned and returns it as short
long	getUnsignedInt(byte[] data, int offset) Gets unsigned int (stored as 4 bytes) and returns it as long
int	getUnsignedShort(byte[] data, int offset) Gets unsigned short (stored as two bytes) and returns it as int
boolean	isUnsafe() Whether current tool instance uses sun.misc.Unsafe
void	putByte(byte[] data, int offset, byte value) Puts byte
void	putInt(byte[] data, int offset, int value) Puts int as four bytes
void	putLong(byte[] data, int offset, long value) Puts long as eight bytes
void	putShort(byte[] data, int offset, short value) Puts short as two bytes
void	putUnsignedByte(byte[] data, int offset, short value) Puts short with value from 0 to 255 inclusive into byte array as one signed byte
void	putUnsignedInt(byte[] data, int offset, long value) Puts long value from 0 to 4294967295 inclusive as four bytes
void	putUnsignedShort(byte[] data, int offset, int value) Puts int with value from 0 to 65535 inclusive as two bytes

Methods inherited from class com.alexkasko.unsafe.bytearray.ByteArrayTool

bitshift, get, unsafe

Methods inherited from class java.lang.Object

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

Field Detail

UNSAFE

private static final sun.misc.Unsafe UNSAFE

BYTE_ARRAY_OFFSET

private static final long BYTE_ARRAY_OFFSET

Constructor Detail

UnsafeByteArrayTool

UnsafeByteArrayTool()

Method Detail

isUnsafe

public boolean isUnsafe()

Whether current tool instance uses sun.misc.Unsafe

Specified by:

isUnsafe in class ByteArrayTool

Returns:

whether unsafe

getByte

public byte getByte(byte[] data,
           int offset)

Gets byte

Specified by:

getByte in class ByteArrayTool

Parameters:

data - byte array

offset - byte array index

Returns:

byte

putByte

public void putByte(byte[] data,
           int offset,
           byte value)

Puts byte

Specified by:

putByte in class ByteArrayTool

Parameters:

data - byte array

offset - byte array index

value - value

getUnsignedByte

public short getUnsignedByte(byte[] data,
                    int offset)

Gets one byte (stored as one signed byte), converts it to unsigned and returns it as short

Specified by:

getUnsignedByte in class ByteArrayTool

Parameters:

data - byte array

offset - byte array index

Returns:

unsigned byte as short

putUnsignedByte

public void putUnsignedByte(byte[] data,
                   int offset,
                   short value)

Puts short with value from 0 to 255 inclusive into byte array as one signed byte

Specified by:

putUnsignedByte in class ByteArrayTool

Parameters:

data - byte array

offset - byte array index

value - unsigned byte

getShort

public short getShort(byte[] data,
             int offset)

Gets two bytes as short

Specified by:

getShort in class ByteArrayTool

Parameters:

data - byte array

offset - byte array offset

Returns:

short value

putShort

public void putShort(byte[] data,
            int offset,
            short value)

Puts short as two bytes

Specified by:

putShort in class ByteArrayTool

Parameters:

data - byte array

offset - byte array offset

value - short value

getUnsignedShort

public int getUnsignedShort(byte[] data,
                   int offset)

Gets unsigned short (stored as two bytes) and returns it as int

Specified by:

getUnsignedShort in class ByteArrayTool

Parameters:

data - byte array

offset - byte array offset

Returns:

unsigned short as int

putUnsignedShort

public void putUnsignedShort(byte[] data,
                    int offset,
                    int value)

Puts int with value from 0 to 65535 inclusive as two bytes

Specified by:

putUnsignedShort in class ByteArrayTool

Parameters:

data - byte array

offset - byte array offset

value - unsigned short as int

getInt

public int getInt(byte[] data,
         int offset)

Gets four bytes as int

Specified by:

getInt in class ByteArrayTool

Parameters:

data - byte array

offset - byte array offset

Returns:

int value

putInt

public void putInt(byte[] data,
          int offset,
          int value)

Puts int as four bytes

Specified by:

putInt in class ByteArrayTool

Parameters:

data - byte array

offset - byte array offset

value - int value

getUnsignedInt

public long getUnsignedInt(byte[] data,
                  int offset)

Gets unsigned int (stored as 4 bytes) and returns it as long

Specified by:

getUnsignedInt in class ByteArrayTool

Parameters:

data - byte array

offset - byte array offset

Returns:

unsigned int as long

putUnsignedInt

public void putUnsignedInt(byte[] data,
                  int offset,
                  long value)

Puts long value from 0 to 4294967295 inclusive as four bytes

Specified by:

putUnsignedInt in class ByteArrayTool

Parameters:

data - byte array

offset - byte array offset

value - unsigned int as long

getLong

public long getLong(byte[] data,
           int offset)

Gets long

Specified by:

getLong in class ByteArrayTool

Parameters:

data - byte array

offset - byte array offset

Returns:

long value

putLong

public void putLong(byte[] data,
           int offset,
           long value)

Puts long as eight bytes

Specified by:

putLong in class ByteArrayTool

Parameters:

data - byte array

offset - byte array offset

value - long value

copy

public void copy(byte[] src,
        int srcPos,
        byte[] dest,
        int destPos,
        int length)

Copies part of one array into another. Unsafe implementation has less bounds checks (if assertions are disabled in runtime) then System.arraycopy(Object, int, Object, int, int) that is used by fallback implementation uses

Specified by:

copy in class ByteArrayTool

Parameters:

src - source array

srcPos - source array position

dest - destination array

destPos - destination array position

length - length to copy