org.apache.lucene.codecs.blockterms

Class VariableGapTermsIndexWriter

java.lang.Object

org.apache.lucene.codecs.blockterms.TermsIndexWriterBase

org.apache.lucene.codecs.blockterms.VariableGapTermsIndexWriter

All Implemented Interfaces:

Closeable

public class VariableGapTermsIndexWriter
extends TermsIndexWriterBase

Selects index terms according to provided pluggable VariableGapTermsIndexWriter.IndexTermSelector, and stores them in a prefix trie that's loaded entirely in RAM stored as an FST. This terms index only supports unsigned byte term sort order (unicode codepoint order when the bytes are UTF8).

WARNING: This API is experimental and might change in incompatible ways in the next release.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	VariableGapTermsIndexWriter.EveryNOrDocFreqTermSelector Sets an index term when docFreq >= docFreqThresh, or every interval terms.
static class	VariableGapTermsIndexWriter.EveryNTermSelector Same policy as FixedGapTermsIndexWriter
static class	VariableGapTermsIndexWriter.IndexTermSelector Hook for selecting which terms should be placed in the terms index.

Nested classes/interfaces inherited from class org.apache.lucene.codecs.blockterms.TermsIndexWriterBase

TermsIndexWriterBase.FieldWriter

Field Summary

Fields

Modifier and Type	Field and Description
protected IndexOutput	out

Constructor Summary

Constructors

Constructor and Description
VariableGapTermsIndexWriter(SegmentWriteState state, VariableGapTermsIndexWriter.IndexTermSelector policy)

Method Summary

Methods

Modifier and Type	Method and Description
TermsIndexWriterBase.FieldWriter	addField(FieldInfo field, long termsFilePointer)
void	close()
protected int	indexedTermPrefixLength(BytesRef priorTerm, BytesRef indexedTerm) NOTE: if your codec does not sort in unicode code point order, you must override this method, to simply return indexedTerm.length.

Methods inherited from class java.lang.Object

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

Field Detail

out

protected final IndexOutput out

Constructor Detail

VariableGapTermsIndexWriter

public VariableGapTermsIndexWriter(SegmentWriteState state,
                           VariableGapTermsIndexWriter.IndexTermSelector policy)
                            throws IOException

Throws:

IOException

Method Detail

addField

public TermsIndexWriterBase.FieldWriter addField(FieldInfo field,
                                        long termsFilePointer)
                                          throws IOException

Specified by:

addField in class TermsIndexWriterBase

Throws:

IOException

indexedTermPrefixLength

protected int indexedTermPrefixLength(BytesRef priorTerm,
                          BytesRef indexedTerm)

NOTE: if your codec does not sort in unicode code point order, you must override this method, to simply return indexedTerm.length.

close

public void close()
           throws IOException

Throws:

IOException