org.apache.hadoop.hbase.util

Class UnsafeAccess

java.lang.Object

org.apache.hadoop.hbase.util.UnsafeAccess

@InterfaceAudience.Private
 @InterfaceStability.Evolving
public final class UnsafeAccess
extends Object

Field Summary

Fields

Modifier and Type	Field and Description
static long	BYTE_ARRAY_BASE_OFFSET The offset to the first element in a byte array.
static boolean	LITTLE_ENDIAN
(package private) static long	UNSAFE_COPY_THRESHOLD

Constructor Summary

Constructors

Modifier	Constructor and Description
private	UnsafeAccess()

Method Summary

Modifier and Type	Method and Description
static void	copy(byte[] src, int srcOffset, ByteBuffer dest, int destOffset, int length) Copies the bytes from given array's offset to length part into the given buffer.
static void	copy(ByteBuffer src, int srcOffset, byte[] dest, int destOffset, int length) Copies specified number of bytes from given offset of src ByteBuffer to the dest array.
static void	copy(ByteBuffer src, int srcOffset, ByteBuffer dest, int destOffset, int length) Copies specified number of bytes from given offset of src buffer into the dest buffer.
static long	directBufferAddress(ByteBuffer buf)
static void	freeDirectBuffer(ByteBuffer buffer)
private static int	getAsInt(ByteBuffer buf, int offset) Reads bytes at the given offset as an int value.
private static long	getAsLong(ByteBuffer buf, int offset) Reads bytes at the given offset as a long value.
private static short	getAsShort(ByteBuffer buf, int offset) Reads bytes at the given offset as a short value.
static int	putByte(ByteBuffer buf, int offset, byte b) Put a byte value out to the specified BB position in big-endian format.
static int	putInt(byte[] bytes, int offset, int val) Put an int value out to the specified byte array position in big-endian format.
static int	putInt(ByteBuffer buf, int offset, int val) Put an int value out to the specified ByteBuffer offset in big-endian format.
static int	putLong(byte[] bytes, int offset, long val) Put a long value out to the specified byte array position in big-endian format.
static int	putLong(ByteBuffer buf, int offset, long val) Put a long value out to the specified BB position in big-endian format.
static int	putShort(byte[] bytes, int offset, short val) Put a short value out to the specified byte array position in big-endian format.
static int	putShort(ByteBuffer buf, int offset, short val) Put a short value out to the specified BB position in big-endian format.
static byte	toByte(ByteBuffer buf, int offset) Returns the byte at the given offset
static byte	toByte(Object ref, long offset) Returns the byte at the given offset of the object
static int	toInt(byte[] bytes, int offset) Converts a byte array to an int value considering it was written in big-endian format.
static int	toInt(ByteBuffer buf, int offset) Reads an int value at the given buffer's offset considering it was written in big-endian format.
static int	toInt(Object ref, long offset) Reads a int value at the given Object's offset considering it was written in big-endian format.
static long	toLong(byte[] bytes, int offset) Converts a byte array to a long value considering it was written in big-endian format.
static long	toLong(ByteBuffer buf, int offset) Reads a long value at the given buffer's offset considering it was written in big-endian format.
static long	toLong(Object ref, long offset) Reads a long value at the given Object's offset considering it was written in big-endian format.
static short	toShort(byte[] bytes, int offset) Converts a byte array to a short value considering it was written in big-endian format.
static short	toShort(ByteBuffer buf, int offset) Reads a short value at the given buffer's offset considering it was written in big-endian format.
static short	toShort(Object ref, long offset) Reads a short value at the given Object's offset considering it was written in big-endian format.
private static void	unsafeCopy(Object src, long srcAddr, Object dst, long destAddr, long len)

Methods inherited from class java.lang.Object

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

Field Detail

BYTE_ARRAY_BASE_OFFSET

public static final long BYTE_ARRAY_BASE_OFFSET

The offset to the first element in a byte array.

LITTLE_ENDIAN

public static final boolean LITTLE_ENDIAN

UNSAFE_COPY_THRESHOLD

static final long UNSAFE_COPY_THRESHOLD

See Also:

Constant Field Values

Constructor Detail

UnsafeAccess

private UnsafeAccess()

Method Detail

toShort

public static short toShort(byte[] bytes,
                            int offset)

Converts a byte array to a short value considering it was written in big-endian format.

Parameters:

bytes - byte array

offset - offset into array

Returns:

the short value

toInt

public static int toInt(byte[] bytes,
                        int offset)

Converts a byte array to an int value considering it was written in big-endian format.

Parameters:

bytes - byte array

offset - offset into array

Returns:

the int value

toLong

public static long toLong(byte[] bytes,
                          int offset)

Converts a byte array to a long value considering it was written in big-endian format.

Parameters:

bytes - byte array

offset - offset into array

Returns:

the long value

putShort

public static int putShort(byte[] bytes,
                           int offset,
                           short val)

Put a short value out to the specified byte array position in big-endian format.

Parameters:

bytes - the byte array

offset - position in the array

val - short to write out

Returns:

incremented offset

putInt

public static int putInt(byte[] bytes,
                         int offset,
                         int val)

Put an int value out to the specified byte array position in big-endian format.

Parameters:

bytes - the byte array

offset - position in the array

val - int to write out

Returns:

incremented offset

putLong

public static int putLong(byte[] bytes,
                          int offset,
                          long val)

Put a long value out to the specified byte array position in big-endian format.

Parameters:

bytes - the byte array

offset - position in the array

val - long to write out

Returns:

incremented offset

toShort

public static short toShort(ByteBuffer buf,
                            int offset)

Reads a short value at the given buffer's offset considering it was written in big-endian format.

Returns:

short value at offset

toShort

public static short toShort(Object ref,
                            long offset)

Reads a short value at the given Object's offset considering it was written in big-endian format.

Returns:

short value at offset

getAsShort

private static short getAsShort(ByteBuffer buf,
                                int offset)

Reads bytes at the given offset as a short value.

Returns:

short value at offset

toInt

public static int toInt(ByteBuffer buf,
                        int offset)

Reads an int value at the given buffer's offset considering it was written in big-endian format.

Returns:

int value at offset

toInt

public static int toInt(Object ref,
                        long offset)

Reads a int value at the given Object's offset considering it was written in big-endian format. nn * @return int value at offset

getAsInt

private static int getAsInt(ByteBuffer buf,
                            int offset)

Reads bytes at the given offset as an int value.

Returns:

int value at offset

toLong

public static long toLong(ByteBuffer buf,
                          int offset)

Reads a long value at the given buffer's offset considering it was written in big-endian format.

Returns:

long value at offset

toLong

public static long toLong(Object ref,
                          long offset)

Reads a long value at the given Object's offset considering it was written in big-endian format.

Returns:

long value at offset

getAsLong

private static long getAsLong(ByteBuffer buf,
                              int offset)

Reads bytes at the given offset as a long value.

Returns:

long value at offset

toByte

public static byte toByte(ByteBuffer buf,
                          int offset)

Returns the byte at the given offset

Parameters:

buf - the buffer to read

offset - the offset at which the byte has to be read

Returns:

the byte at the given offset

toByte

public static byte toByte(Object ref,
                          long offset)

Returns the byte at the given offset of the object

Returns:

the byte at the given offset

putInt

public static int putInt(ByteBuffer buf,
                         int offset,
                         int val)

Put an int value out to the specified ByteBuffer offset in big-endian format.

Parameters:

buf - the ByteBuffer to write to

offset - offset in the ByteBuffer

val - int to write out

Returns:

incremented offset

copy

public static void copy(byte[] src,
                        int srcOffset,
                        ByteBuffer dest,
                        int destOffset,
                        int length)

Copies the bytes from given array's offset to length part into the given buffer.

Parameters:

src - source array

srcOffset - offset into source buffer

dest - destination buffer

destOffset - offset into destination buffer

length - length of data to copy

unsafeCopy

private static void unsafeCopy(Object src,
                               long srcAddr,
                               Object dst,
                               long destAddr,
                               long len)

copy

public static void copy(ByteBuffer src,
                        int srcOffset,
                        byte[] dest,
                        int destOffset,
                        int length)

Copies specified number of bytes from given offset of src ByteBuffer to the dest array.

Parameters:

src - source buffer

srcOffset - offset into source buffer

dest - destination array

destOffset - offset into destination buffer

length - length of data to copy

copy

public static void copy(ByteBuffer src,
                        int srcOffset,
                        ByteBuffer dest,
                        int destOffset,
                        int length)

Copies specified number of bytes from given offset of src buffer into the dest buffer.

Parameters:

src - source buffer

srcOffset - offset into source buffer

dest - destination buffer

destOffset - offset into destination buffer

length - length of data to copy

putShort

public static int putShort(ByteBuffer buf,
                           int offset,
                           short val)

Put a short value out to the specified BB position in big-endian format.

Parameters:

buf - the byte buffer

offset - position in the buffer

val - short to write out

Returns:

incremented offset

putLong

public static int putLong(ByteBuffer buf,
                          int offset,
                          long val)

Put a long value out to the specified BB position in big-endian format.

Parameters:

buf - the byte buffer

offset - position in the buffer

val - long to write out

Returns:

incremented offset

putByte

public static int putByte(ByteBuffer buf,
                          int offset,
                          byte b)

Put a byte value out to the specified BB position in big-endian format.

Parameters:

buf - the byte buffer

offset - position in the buffer

b - byte to write out

Returns:

incremented offset

directBufferAddress

public static long directBufferAddress(ByteBuffer buf)

freeDirectBuffer

public static void freeDirectBuffer(ByteBuffer buffer)