org.apache.lucene.codecs.uniformsplit

Class BlockLine.Serializer

java.lang.Object

org.apache.lucene.codecs.uniformsplit.BlockLine.Serializer

All Implemented Interfaces:

Accountable

Direct Known Subclasses:

STBlockLine.Serializer

Enclosing class:

BlockLine

public static class BlockLine.Serializer
extends java.lang.Object
implements Accountable

Reads block lines with terms encoded incrementally inside a block. This class keeps a state of the previous term read to decode the next term.

Field Summary

Fields

Modifier and Type	Field and Description
private static long	BASE_RAM_USAGE
protected BytesRef	currentTerm

Constructor Summary

Constructors

Constructor and Description
Serializer()

Method Summary

Modifier and Type	Method and Description
protected static int	numBitsToEncode(int i) Gets the number of bits required to encode the value of the provided int.
long	ramBytesUsed() Return the memory usage of this object in bytes.
protected static void	readBytes(DataInput input, BytesRef bytes, int offset, int length) Reads length bytes from the given DataInput and stores them at offset in bytes.bytes.
protected TermBytes	readIncrementallyEncodedTerm(DataInput blockInput, boolean isIncrementalEncodingSeed, TermBytes reuse)
BlockLine	readLine(DataInput blockInput, boolean isIncrementalEncodingSeed, BlockLine reuse) Reads the current line.
protected static void	writeIncrementallyEncodedTerm(TermBytes termBytes, TermBytes previousTermBytes, boolean isIncrementalEncodingSeed, DataOutput blockOutput)
static void	writeLine(DataOutput blockOutput, BlockLine line, BlockLine previousLine, int termStateRelativeOffset, boolean isIncrementalEncodingSeed) Writes a line and its offset to the corresponding term state details in the details region.
protected static void	writeLineTermState(DataOutput termStatesOutput, BlockLine line, FieldInfo fieldInfo, DeltaBaseTermStateSerializer encoder) Writes the term state details of a line in the details region.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.lucene.util.Accountable

getChildResources

Field Detail

BASE_RAM_USAGE

private static final long BASE_RAM_USAGE

currentTerm

protected final BytesRef currentTerm

Constructor Detail

Serializer

public Serializer()

Method Detail

readLine

public BlockLine readLine(DataInput blockInput,
                          boolean isIncrementalEncodingSeed,
                          BlockLine reuse)
                   throws java.io.IOException

Reads the current line.

Parameters:

isIncrementalEncodingSeed - Whether the term is a seed of the incremental encoding. true for the first and middle term, false for other terms.

reuse - A BlockLine instance to reuse; or null if none.

Throws:

java.io.IOException

writeLine

public static void writeLine(DataOutput blockOutput,
                             BlockLine line,
                             BlockLine previousLine,
                             int termStateRelativeOffset,
                             boolean isIncrementalEncodingSeed)
                      throws java.io.IOException

Writes a line and its offset to the corresponding term state details in the details region.

Parameters:

blockOutput - The output pointing to the block terms region.

termStateRelativeOffset - The offset to the corresponding term state details in the details region.

isIncrementalEncodingSeed - Whether the term is a seed of the incremental encoding. true for the first and middle term, false for other terms.

Throws:

java.io.IOException

writeLineTermState

protected static void writeLineTermState(DataOutput termStatesOutput,
                                         BlockLine line,
                                         FieldInfo fieldInfo,
                                         DeltaBaseTermStateSerializer encoder)
                                  throws java.io.IOException

Writes the term state details of a line in the details region.

Parameters:

termStatesOutput - The output pointing to the details region.

Throws:

java.io.IOException

writeIncrementallyEncodedTerm

protected static void writeIncrementallyEncodedTerm(TermBytes termBytes,
                                                    TermBytes previousTermBytes,
                                                    boolean isIncrementalEncodingSeed,
                                                    DataOutput blockOutput)
                                             throws java.io.IOException

Throws:

java.io.IOException

readIncrementallyEncodedTerm

protected TermBytes readIncrementallyEncodedTerm(DataInput blockInput,
                                                 boolean isIncrementalEncodingSeed,
                                                 TermBytes reuse)
                                          throws java.io.IOException

Throws:

java.io.IOException

readBytes

protected static void readBytes(DataInput input,
                                BytesRef bytes,
                                int offset,
                                int length)
                         throws java.io.IOException

Reads length bytes from the given DataInput and stores them at offset in bytes.bytes.

Throws:

java.io.IOException

ramBytesUsed

public long ramBytesUsed()

Description copied from interface: Accountable

Return the memory usage of this object in bytes. Negative values are illegal.

Specified by:

ramBytesUsed in interface Accountable

numBitsToEncode

protected static int numBitsToEncode(int i)

Gets the number of bits required to encode the value of the provided int. Returns 0 for int value 0. Equivalent to (log2(i) + 1).