org.apache.lucene.index

Class FilterAtomicReader.FilterTerms

java.lang.Object

org.apache.lucene.index.Terms

org.apache.lucene.index.FilterAtomicReader.FilterTerms

Enclosing class:

FilterAtomicReader

public static class FilterAtomicReader.FilterTerms
extends Terms

Base class for filtering Terms implementations.

NOTE: If the order of terms and documents is not changed, and if these terms are going to be intersected with automata, you could consider overriding Terms.intersect(org.apache.lucene.util.automaton.CompiledAutomaton, org.apache.lucene.util.BytesRef) for better performance.

Field Summary

Fields inherited from class org.apache.lucene.index.Terms

EMPTY_ARRAY

Constructor Summary

Constructors

Constructor and Description
FilterTerms(Terms in) Creates a new FilterTerms

Method Summary

Modifier and Type	Method and Description
java.util.Comparator<BytesRef>	getComparator() Return the BytesRef Comparator used to sort terms provided by the iterator.
int	getDocCount() Returns the number of documents that have at least one term for this field, or -1 if this measure isn't stored by the codec.
long	getSumDocFreq() Returns the sum of TermsEnum.docFreq() for all terms in this field, or -1 if this measure isn't stored by the codec.
long	getSumTotalTermFreq() Returns the sum of TermsEnum.totalTermFreq() for all terms in this field, or -1 if this measure isn't stored by the codec (or if this fields omits term freq and positions).
boolean	hasFreqs() Returns true if documents in this field store per-document term frequency (DocsEnum.freq()).
boolean	hasOffsets() Returns true if documents in this field store offsets.
boolean	hasPayloads() Returns true if documents in this field store payloads.
boolean	hasPositions() Returns true if documents in this field store positions.
TermsEnum	iterator(TermsEnum reuse) Returns an iterator that will step through all terms.
long	size() Returns the number of terms for this field, or -1 if this measure isn't stored by the codec.

Methods inherited from class org.apache.lucene.index.Terms

intersect

Methods inherited from class java.lang.Object

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

Constructor Detail

FilterTerms

public FilterTerms(Terms in)

Creates a new FilterTerms

Parameters:

in - the underlying Terms instance.

Method Detail

iterator

public TermsEnum iterator(TermsEnum reuse)
                   throws java.io.IOException

Description copied from class: Terms

Returns an iterator that will step through all terms. This method will not return null. If you have a previous TermsEnum, for example from a different field, you can pass it for possible reuse if the implementation can do so.

Specified by:

iterator in class Terms

Throws:

java.io.IOException

getComparator

public java.util.Comparator<BytesRef> getComparator()

Description copied from class: Terms

Return the BytesRef Comparator used to sort terms provided by the iterator. This method may return null if there are no terms. This method may be invoked many times; it's best to cache a single instance & reuse it.

Specified by:

getComparator in class Terms

size

public long size()
          throws java.io.IOException

Description copied from class: Terms

Returns the number of terms for this field, or -1 if this measure isn't stored by the codec. Note that, just like other term measures, this measure does not take deleted documents into account.

Specified by:

size in class Terms

Throws:

java.io.IOException

getSumTotalTermFreq

public long getSumTotalTermFreq()
                         throws java.io.IOException

Description copied from class: Terms

Returns the sum of TermsEnum.totalTermFreq() for all terms in this field, or -1 if this measure isn't stored by the codec (or if this fields omits term freq and positions). Note that, just like other term measures, this measure does not take deleted documents into account.

Specified by:

getSumTotalTermFreq in class Terms

Throws:

java.io.IOException

getSumDocFreq

public long getSumDocFreq()
                   throws java.io.IOException

Description copied from class: Terms

Returns the sum of TermsEnum.docFreq() for all terms in this field, or -1 if this measure isn't stored by the codec. Note that, just like other term measures, this measure does not take deleted documents into account.

Specified by:

getSumDocFreq in class Terms

Throws:

java.io.IOException

getDocCount

public int getDocCount()
                throws java.io.IOException

Description copied from class: Terms

Returns the number of documents that have at least one term for this field, or -1 if this measure isn't stored by the codec. Note that, just like other term measures, this measure does not take deleted documents into account.

Specified by:

getDocCount in class Terms

Throws:

java.io.IOException

hasFreqs

public boolean hasFreqs()

Description copied from class: Terms

Returns true if documents in this field store per-document term frequency (DocsEnum.freq()).

Specified by:

hasFreqs in class Terms

hasOffsets

public boolean hasOffsets()

Description copied from class: Terms

Returns true if documents in this field store offsets.

Specified by:

hasOffsets in class Terms

hasPositions

public boolean hasPositions()

Description copied from class: Terms

Returns true if documents in this field store positions.

Specified by:

hasPositions in class Terms

hasPayloads

public boolean hasPayloads()

Description copied from class: Terms

Returns true if documents in this field store payloads.

Specified by:

hasPayloads in class Terms