org.apache.lucene.search.uhighlight

Class TokenStreamOffsetStrategy

java.lang.Object

org.apache.lucene.search.uhighlight.FieldOffsetStrategy

org.apache.lucene.search.uhighlight.AnalysisOffsetStrategy

org.apache.lucene.search.uhighlight.TokenStreamOffsetStrategy

public class TokenStreamOffsetStrategy
extends AnalysisOffsetStrategy

Analyzes the text, producing a single OffsetsEnum wrapping the TokenStream filtered to terms in the query, including wildcards. It can't handle position-sensitive queries (phrases). Passage accuracy suffers because the freq() is unknown -- it's always Integer.MAX_VALUE instead.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
private static class	TokenStreamOffsetStrategy.TokenStreamPostingsEnum

Field Summary

Fields

Modifier and Type	Field and Description
private static BytesRef[]	ZERO_LEN_BYTES_REF_ARRAY

Fields inherited from class org.apache.lucene.search.uhighlight.AnalysisOffsetStrategy

analyzer

Fields inherited from class org.apache.lucene.search.uhighlight.FieldOffsetStrategy

automata, field, phraseHelper, terms

Constructor Summary

Constructors

Constructor and Description
TokenStreamOffsetStrategy(java.lang.String field, BytesRef[] terms, PhraseHelper phraseHelper, CharacterRunAutomaton[] automata, Analyzer indexAnalyzer)

Method Summary

Modifier and Type	Method and Description
private static CharacterRunAutomaton[]	convertTermsToAutomata(BytesRef[] terms, CharacterRunAutomaton[] automata)
java.util.List<OffsetsEnum>	getOffsetsEnums(IndexReader reader, int docId, java.lang.String content) The primary method -- return offsets for highlightable words in the specified document.

Methods inherited from class org.apache.lucene.search.uhighlight.AnalysisOffsetStrategy

getOffsetSource, tokenStream

Methods inherited from class org.apache.lucene.search.uhighlight.FieldOffsetStrategy

createAutomataOffsetsFromTerms, createOffsetsEnumsFromReader, getField

Methods inherited from class java.lang.Object

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

Field Detail

ZERO_LEN_BYTES_REF_ARRAY

private static final BytesRef[] ZERO_LEN_BYTES_REF_ARRAY

Constructor Detail

TokenStreamOffsetStrategy

public TokenStreamOffsetStrategy(java.lang.String field,
                                 BytesRef[] terms,
                                 PhraseHelper phraseHelper,
                                 CharacterRunAutomaton[] automata,
                                 Analyzer indexAnalyzer)

Method Detail

convertTermsToAutomata

private static CharacterRunAutomaton[] convertTermsToAutomata(BytesRef[] terms,
                                                              CharacterRunAutomaton[] automata)

getOffsetsEnums

public java.util.List<OffsetsEnum> getOffsetsEnums(IndexReader reader,
                                                   int docId,
                                                   java.lang.String content)
                                            throws java.io.IOException

Description copied from class: FieldOffsetStrategy

The primary method -- return offsets for highlightable words in the specified document. IMPORTANT: remember to close them all.

Specified by:

getOffsetsEnums in class FieldOffsetStrategy

Throws:

java.io.IOException