org.apache.lucene.search.uhighlight

Class FieldOffsetStrategy

java.lang.Object

org.apache.lucene.search.uhighlight.FieldOffsetStrategy

Direct Known Subclasses:

AnalysisOffsetStrategy, NoOpOffsetStrategy, PostingsOffsetStrategy, PostingsWithTermVectorsOffsetStrategy, TermVectorOffsetStrategy

public abstract class FieldOffsetStrategy
extends Object

Ultimately returns a list of OffsetsEnum yielding potentially highlightable words in the text. Needs information about the query up front.

NOTE: This API is for internal purposes only and might change in incompatible ways in the next release.

Field Summary

Fields

Modifier and Type	Field and Description
protected CharacterRunAutomaton[]	automata
protected String	field
protected PhraseHelper	strictPhrases
protected BytesRef[]	terms

Constructor Summary

Constructors

Constructor and Description
FieldOffsetStrategy(String field, BytesRef[] queryTerms, PhraseHelper phraseHelper, CharacterRunAutomaton[] automata)

Method Summary

Modifier and Type	Method and Description
protected OffsetsEnum	createOffsetsEnumFromTokenStream(int doc, TokenStream tokenStream)
protected List<OffsetsEnum>	createOffsetsEnums(LeafReader leafReader, int doc, TokenStream tokenStream)
protected List<OffsetsEnum>	createOffsetsEnumsFromReader(LeafReader atomicReader, int doc)
String	getField()
abstract List<OffsetsEnum>	getOffsetsEnums(IndexReader reader, int docId, String content) The primary method -- return offsets for highlightable words in the specified document.
abstract UnifiedHighlighter.OffsetSource	getOffsetSource()

Methods inherited from class java.lang.Object

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

Field Detail

field

protected final String field

terms

protected BytesRef[] terms

strictPhrases

protected PhraseHelper strictPhrases

automata

protected CharacterRunAutomaton[] automata

Constructor Detail

FieldOffsetStrategy

public FieldOffsetStrategy(String field,
                           BytesRef[] queryTerms,
                           PhraseHelper phraseHelper,
                           CharacterRunAutomaton[] automata)

Method Detail

getField

public String getField()

getOffsetSource

public abstract UnifiedHighlighter.OffsetSource getOffsetSource()

getOffsetsEnums

public abstract List<OffsetsEnum> getOffsetsEnums(IndexReader reader,
                                                  int docId,
                                                  String content)
                                           throws IOException

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

Throws:

IOException

createOffsetsEnums

protected List<OffsetsEnum> createOffsetsEnums(LeafReader leafReader,
                                               int doc,
                                               TokenStream tokenStream)
                                        throws IOException

Throws:

IOException

createOffsetsEnumsFromReader

protected List<OffsetsEnum> createOffsetsEnumsFromReader(LeafReader atomicReader,
                                                         int doc)
                                                  throws IOException

Throws:

IOException

createOffsetsEnumFromTokenStream

protected OffsetsEnum createOffsetsEnumFromTokenStream(int doc,
                                                       TokenStream tokenStream)
                                                throws IOException

Throws:

IOException