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Java Source Code / Java Documentation » Search Engine » mg4j » it.unimi.dsi.mg4j.index

Source Cross Reference

Class Diagram

Java Document (Java Doc)

java.lang .Object

it.unimi.dsi.mg4j.index .AbstractBitStreamIndexWriter

All known Subclasses:   it.unimi.dsi.mg4j.index .BitStreamHPIndexWriter,  it.unimi.dsi.mg4j.index .BitStreamIndexWriter,
AbstractBitStreamIndexWriter
abstract public class AbstractBitStreamIndexWriter implements IndexWriter(Code)
An abstract bitstream-based index writer, providing common variables and a basic AbstractBitStreamIndexWriter.printStats(PrintStream) implementation.
Compression flags

Implementing subclasses need to know the compression method that they should use to write frequencies, pointers, payloads, counts and positions (and whether to write any of them). This information is passed to the using a suitable flag map (see CompressionFlags ).
author:
   Sebastiano Vigna
since:
   1.2

Field Summary
public long bitsForCounts
     The number of bits written for counts.
public long bitsForFrequencies
     The number of bits written for frequencies.
public long bitsForPayloads
     The number of bits written for payloads.
public long bitsForPointers
     The number of bits written for document pointers.
public long bitsForPositions
     The number of bits written for positions.
protected Coding countCoding
     The coding for counts.
protected int currentTerm
     The current term.
public Map<Component, Coding> flags
     The flag map.
protected Coding frequencyCoding
     The coding for frequencies.
final protected boolean hasCounts
     Whether this index contains counts.
final protected boolean hasPayloads
     Whether this index contains payloads.
final protected boolean hasPositions
     Whether this index contains positions.
final protected int numberOfDocuments
     The number of documents of the collection to be indexed.
protected long numberOfOccurrences
     The number of indexed occurrences.
protected long numberOfPostings
     The number of indexed postings (pairs term/document).
protected Coding pointerCoding
     The coding for pointers.
protected Coding positionCoding
     The coding for positions.

Constructor Summary
public AbstractBitStreamIndexWriter(int numberOfDocuments, Map<Component, Coding> flags)


Method Summary
public void printStats(PrintStream stats)


Field Detail
bitsForCounts
public long bitsForCounts(Code)
The number of bits written for counts.

bitsForFrequencies
public long bitsForFrequencies(Code)
The number of bits written for frequencies.

bitsForPayloads
public long bitsForPayloads(Code)
The number of bits written for payloads.

bitsForPointers
public long bitsForPointers(Code)
The number of bits written for document pointers.

bitsForPositions
public long bitsForPositions(Code)
The number of bits written for positions.

countCoding
protected Coding countCoding(Code)
The coding for counts.

currentTerm
protected int currentTerm(Code)
The current term.

flags
public Map<Component, Coding> flags(Code)
The flag map.

frequencyCoding
protected Coding frequencyCoding(Code)
The coding for frequencies.

hasCounts
final protected boolean hasCounts(Code)
Whether this index contains counts.

hasPayloads
final protected boolean hasPayloads(Code)
Whether this index contains payloads.

hasPositions
final protected boolean hasPositions(Code)
Whether this index contains positions.

numberOfDocuments
final protected int numberOfDocuments(Code)
The number of documents of the collection to be indexed.

numberOfOccurrences
protected long numberOfOccurrences(Code)
The number of indexed occurrences.

numberOfPostings
protected long numberOfPostings(Code)
The number of indexed postings (pairs term/document).

pointerCoding
protected Coding pointerCoding(Code)
The coding for pointers.

positionCoding
protected Coding positionCoding(Code)
The coding for positions.

Constructor Detail
AbstractBitStreamIndexWriter
public AbstractBitStreamIndexWriter(int numberOfDocuments, Map<Component, Coding> flags)(Code)

Method Detail
printStats
public void printStats(PrintStream stats)(Code)

Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
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public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
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final public void wait() throws InterruptedException(Code)(Java Doc)

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