com.xxdb.compression

Class DeltaBitOutput

java.lang.Object

com.xxdb.compression.DeltaBitOutput

public class DeltaBitOutput
extends Object

Field Summary

Fields

Modifier and Type	Field and Description
static long[]	BIT_SET_MASK
protected int	bitsLeft
static int	DEFAULT_ALLOCATION
protected long	lB
static long[]	MASK_ARRAY

Constructor Summary

Constructors

Constructor and Description
DeltaBitOutput() Creates a new ByteBufferBitOutput with a default allocated size of 4096 bytes.
DeltaBitOutput(int initialSize) Give an initialSize different than DEFAULT_ALLOCATIONS.

Method Summary

Modifier and Type	Method and Description
protected int	capacityLeft()
protected void	expandAllocation()
protected void	flipWord()
protected void	flipWordWithoutExpandCheck()
void	flush() Causes the currently handled word to be written to the stream
long[]	getLongArray()
void	skipBit()
void	writeBit() Sets the next bit (or not) and moves the bit pointer.
void	writeBits(long value, int bits) Writes the given long to the stream using bits amount of meaningful bits.

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_ALLOCATION

public static final int DEFAULT_ALLOCATION

See Also:

Constant Field Values

lB

protected long lB

bitsLeft

protected int bitsLeft

MASK_ARRAY

public static final long[] MASK_ARRAY

BIT_SET_MASK

public static final long[] BIT_SET_MASK

Constructor Detail

DeltaBitOutput

public DeltaBitOutput()

Creates a new ByteBufferBitOutput with a default allocated size of 4096 bytes.

DeltaBitOutput

public DeltaBitOutput(int initialSize)

Give an initialSize different than DEFAULT_ALLOCATIONS. Recommended to use values which are dividable by 4096.

Parameters:

initialSize - New initialsize to use

Method Detail

expandAllocation

protected void expandAllocation()

capacityLeft

protected int capacityLeft()

flipWord

protected void flipWord()

flipWordWithoutExpandCheck

protected void flipWordWithoutExpandCheck()

writeBit

public void writeBit()

Sets the next bit (or not) and moves the bit pointer.

skipBit

public void skipBit()

writeBits

public void writeBits(long value,
                      int bits)

Writes the given long to the stream using bits amount of meaningful bits. This command does not check input values, so if they're larger than what can fit the bits (you should check this before writing), expect some weird results.

Parameters:

value - Value to be written to the stream

bits - How many bits are stored to the stream

flush

public void flush()

Causes the currently handled word to be written to the stream

getLongArray

public long[] getLongArray()