org.apache.lucene.search

Class ExactPhraseMatcher

java.lang.Object

org.apache.lucene.search.PhraseMatcher

org.apache.lucene.search.ExactPhraseMatcher

final class ExactPhraseMatcher
extends PhraseMatcher

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
private static class	ExactPhraseMatcher.PostingsAndPosition

Field Summary

Fields

Modifier and Type	Field and Description
private ExactPhraseMatcher.PostingsAndPosition[]	postings

Fields inherited from class org.apache.lucene.search.PhraseMatcher

approximation

Constructor Summary

Constructors

Constructor and Description
ExactPhraseMatcher(PhraseQuery.PostingsAndFreq[] postings, float matchCost)

Method Summary

Modifier and Type	Method and Description
private static boolean	advancePosition(ExactPhraseMatcher.PostingsAndPosition posting, int target) Advance the given pos enum to the first doc on or after target.
private static DocIdSetIterator	approximation(PhraseQuery.PostingsAndFreq[] postings)
int	endOffset() The end offset of the current match
int	endPosition() The end position of the current match
(package private) float	maxFreq() An upper bound on the number of possible matches on this document
boolean	nextMatch() Find the next match on the current document, returning false if there are none.
void	reset() Called after PhraseMatcher.approximation has been advanced
(package private) float	sloppyWeight() The slop-adjusted weight of the current match The sum of the slop-adjusted weights is used as the freq for scoring
int	startOffset() The start offset of the current match
int	startPosition() The start position of the current match

Methods inherited from class org.apache.lucene.search.PhraseMatcher

getMatchCost

Methods inherited from class java.lang.Object

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

Field Detail

postings

private final ExactPhraseMatcher.PostingsAndPosition[] postings

Constructor Detail

ExactPhraseMatcher

ExactPhraseMatcher(PhraseQuery.PostingsAndFreq[] postings,
                   float matchCost)

Method Detail

approximation

private static DocIdSetIterator approximation(PhraseQuery.PostingsAndFreq[] postings)

maxFreq

float maxFreq()

Description copied from class: PhraseMatcher

An upper bound on the number of possible matches on this document

Specified by:

maxFreq in class PhraseMatcher

advancePosition

private static boolean advancePosition(ExactPhraseMatcher.PostingsAndPosition posting,
                                       int target)
                                throws java.io.IOException

Advance the given pos enum to the first doc on or after target. Return false if the enum was exhausted before reaching target and true otherwise.

Throws:

java.io.IOException

reset

public void reset()
           throws java.io.IOException

Description copied from class: PhraseMatcher

Called after PhraseMatcher.approximation has been advanced

Specified by:

reset in class PhraseMatcher

Throws:

java.io.IOException

nextMatch

public boolean nextMatch()
                  throws java.io.IOException

Description copied from class: PhraseMatcher

Find the next match on the current document, returning false if there are none.

Specified by:

nextMatch in class PhraseMatcher

Throws:

java.io.IOException

sloppyWeight

float sloppyWeight()

Description copied from class: PhraseMatcher

The slop-adjusted weight of the current match The sum of the slop-adjusted weights is used as the freq for scoring

Specified by:

sloppyWeight in class PhraseMatcher

startPosition

public int startPosition()

Description copied from class: PhraseMatcher

The start position of the current match

Specified by:

startPosition in class PhraseMatcher

endPosition

public int endPosition()

Description copied from class: PhraseMatcher

The end position of the current match

Specified by:

endPosition in class PhraseMatcher

startOffset

public int startOffset()
                throws java.io.IOException

Description copied from class: PhraseMatcher

The start offset of the current match

Specified by:

startOffset in class PhraseMatcher

Throws:

java.io.IOException

endOffset

public int endOffset()
              throws java.io.IOException

Description copied from class: PhraseMatcher

The end offset of the current match

Specified by:

endOffset in class PhraseMatcher

Throws:

java.io.IOException