org.terrier.compression
Class DebuggingBitIn

java.lang.Object
  org.terrier.compression.DebuggingBitIn

All Implemented Interfaces:

java.io.Closeable, BitIn

public class DebuggingBitIn
extends java.lang.Object
implements BitIn, java.io.Closeable

This class provides debugging at the bit stream level. All read*() and skip*() methods log verbosely for each request.

Since:

3.5

Author:

Craig Macdonald

See Also:

BitIn

Field Summary

Fields inherited from interface org.terrier.compression.BitIn

USUAL_EXTENSION

Constructor Summary

DebuggingBitIn(BitIn _in)
Wraps a BitIn implementation with logging calls

Method Summary

void	align() Aligns the stream to the next byte
void	close()
byte	getBitOffset() Returns the bit offset in the last byte.
long	getByteOffset() Returns the byte offset of the stream.
int	readBinary(int len) Reads a binary integer from the already read buffer.
int	readDelta() Reads a delta encoded integer from the underlying stream
int	readGamma() Reads a gamma encoded integer from the underlying stream
int	readGolomb(int b) Reads a Golomb encoded integer
void	readInterpolativeCoding(int[] data, int offset, int len, int lo, int hi) Reads a sequence of numbers from the stream interpolative coded.
int	readMinimalBinary(int b) Reads a binary encoded integer, given an upper bound
int	readMinimalBinaryZero(int b) Reads a minimal binary encoded number, when the upper bound can b zero.
int	readSkewedGolomb(int b) Reads a skewed-golomb encoded integer from the underlying stream Consider a bucket-vector v = <0, 2b, 4b, ...
int	readUnary() Reads a unary encoded integer from the underlying stream
void	skipBits(int len) Skip a number of bits while reading the bit file.
void	skipBytes(long len) Skip a number of bytes while reading the bit file.

Methods inherited from class java.lang.Object

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

Constructor Detail

DebuggingBitIn

public DebuggingBitIn(BitIn _in)

Wraps a BitIn implementation with logging calls

Method Detail

align

public void align()
           throws java.io.IOException

Description copied from interface: BitIn

Aligns the stream to the next byte

Specified by:

align in interface BitIn

Throws:

java.io.IOException - if an I/O error occurs

getBitOffset

public byte getBitOffset()

Description copied from interface: BitIn

Returns the bit offset in the last byte. It corresponds to the position in which the next bit will be written. Use only when writting.

Specified by:

getBitOffset in interface BitIn

Returns:

the bit offset in the stream.

getByteOffset

public long getByteOffset()

Description copied from interface: BitIn

Returns the byte offset of the stream. It corresponds to the position of the byte in which the next bit will be written. Use only when writting

Specified by:

getByteOffset in interface BitIn

Returns:

the byte offset in the stream.

readBinary

public int readBinary(int len)
               throws java.io.IOException

Description copied from interface: BitIn

Reads a binary integer from the already read buffer.

Specified by:

readBinary in interface BitIn

Parameters:

len - the number of binary bits to read

Returns:

the decoded integer

Throws:

java.io.IOException - if an I/O error occurs

readDelta

public int readDelta()
              throws java.io.IOException

Description copied from interface: BitIn

Reads a delta encoded integer from the underlying stream

Specified by:

readDelta in interface BitIn

Returns:

the number read

Throws:

java.io.IOException - if an I/O error occurs

readGamma

public int readGamma()
              throws java.io.IOException

Description copied from interface: BitIn

Reads a gamma encoded integer from the underlying stream

Specified by:

readGamma in interface BitIn

Returns:

the number read

Throws:

java.io.IOException - if an I/O error occurs

readGolomb

public int readGolomb(int b)
               throws java.io.IOException

Description copied from interface: BitIn

Reads a Golomb encoded integer

Specified by:

readGolomb in interface BitIn

Parameters:

b - the golomb modulus

Returns:

the int read

Throws:

java.io.IOException - if and I/O error occurs

readInterpolativeCoding

public void readInterpolativeCoding(int[] data,
                                    int offset,
                                    int len,
                                    int lo,
                                    int hi)
                             throws java.io.IOException

Description copied from interface: BitIn

Reads a sequence of numbers from the stream interpolative coded.

Specified by:

readInterpolativeCoding in interface BitIn

Parameters:

data - the result vector

offset - offset where to write in the vector

len - the number of integers to decode.

lo - a lower bound (the same one passed to writeInterpolativeCoding)

hi - an upper bound (the same one passed to writeInterpolativeCoding)

Throws:

java.io.IOException - if an I/O error occurs

readMinimalBinary

public int readMinimalBinary(int b)
                      throws java.io.IOException

Description copied from interface: BitIn

Reads a binary encoded integer, given an upper bound

Specified by:

readMinimalBinary in interface BitIn

Parameters:

b - the upper bound

Returns:

the int read

Throws:

java.io.IOException - if an I/O error occurs

readMinimalBinaryZero

public int readMinimalBinaryZero(int b)
                          throws java.io.IOException

Description copied from interface: BitIn

Reads a minimal binary encoded number, when the upper bound can b zero. Used to interpolative code

Specified by:

readMinimalBinaryZero in interface BitIn

Parameters:

b - the upper bound

Returns:

the int read

Throws:

java.io.IOException - if an I/O error occurs

readSkewedGolomb

public int readSkewedGolomb(int b)
                     throws java.io.IOException

Description copied from interface: BitIn

Reads a skewed-golomb encoded integer from the underlying stream Consider a bucket-vector v = <0, 2b, 4b, ... , 2^i b, ...> The sum of the elements in the vector goes b, 3b, 7b, 2^(i-1)*b

Specified by:

readSkewedGolomb in interface BitIn

Returns:

the number read

Throws:

java.io.IOException - if an I/O error occurs

readUnary

public int readUnary()
              throws java.io.IOException

Description copied from interface: BitIn

Reads a unary encoded integer from the underlying stream

Specified by:

readUnary in interface BitIn

Returns:

the number read

Throws:

java.io.IOException - if an I/O error occurs

skipBits

public void skipBits(int len)
              throws java.io.IOException

Description copied from interface: BitIn

Skip a number of bits while reading the bit file.

Specified by:

skipBits in interface BitIn

Parameters:

len - The number of bits to skip

Throws:

java.io.IOException - if an I/O error occurs

skipBytes

public void skipBytes(long len)
               throws java.io.IOException

Description copied from interface: BitIn

Skip a number of bytes while reading the bit file. After this opteration, getBitOffset() == 0, so use skipBits to get getBitOffset() to desired value.

Specified by:

skipBytes in interface BitIn

Parameters:

len - The number of bytes to skip

Throws:

java.io.IOException - if an I/O error occurs

close

public void close()
           throws java.io.IOException

Specified by:

close in interface java.io.Closeable

Throws:

java.io.IOException