com.atlassian.jira.issue.index.analyzer

Class StemmingAnalyzer

java.lang.Object

org.apache.lucene.analysis.Analyzer

com.atlassian.jira.issue.index.analyzer.StemmingAnalyzer

All Implemented Interfaces:

Closeable, AutoCloseable

public class StemmingAnalyzer
extends org.apache.lucene.analysis.Analyzer

A TextAnalyzer that takes in a set of stop words and a stem filter as a function to apply to the text being analyzed.

Constructor Summary

Constructors

Constructor and Description
StemmingAnalyzer(org.apache.lucene.util.Version matchVersion, boolean indexing, com.google.common.base.Function<org.apache.lucene.analysis.TokenStream,org.apache.lucene.analysis.TokenStream> stemmingFilter, com.google.common.base.Function<org.apache.lucene.analysis.TokenStream,org.apache.lucene.analysis.TokenStream> stopWordFilter)

Method Summary

Modifier and Type	Method and Description
boolean	isIndexing()
org.apache.lucene.analysis.TokenStream	reusableTokenStream(String fieldName, Reader reader)
org.apache.lucene.analysis.TokenStream	tokenStream(String fieldname, Reader reader)
protected org.apache.lucene.analysis.TokenStream	wrapStreamForIndexing(org.apache.lucene.analysis.TokenStream input) Applies a SubtokenFilter to the input token stream at document indexing time.
protected org.apache.lucene.analysis.TokenStream	wrapStreamForWilcardSearchSupport(org.apache.lucene.analysis.TokenStream input) Applies a KeywordRepeatFilter to the input token stream at document indexing time to store the original tokens as keywords before any stemming filter is applied and therefore support wildcard searches and exact phrase queries on document fields.

Methods inherited from class org.apache.lucene.analysis.Analyzer

close, getOffsetGap, getPositionIncrementGap, getPreviousTokenStream, setPreviousTokenStream

Methods inherited from class java.lang.Object

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

Constructor Detail

StemmingAnalyzer

public StemmingAnalyzer(org.apache.lucene.util.Version matchVersion,
                        boolean indexing,
                        com.google.common.base.Function<org.apache.lucene.analysis.TokenStream,org.apache.lucene.analysis.TokenStream> stemmingFilter,
                        com.google.common.base.Function<org.apache.lucene.analysis.TokenStream,org.apache.lucene.analysis.TokenStream> stopWordFilter)

Method Detail

tokenStream

public final org.apache.lucene.analysis.TokenStream tokenStream(String fieldname,
                                                                Reader reader)

Specified by:

tokenStream in class org.apache.lucene.analysis.Analyzer

isIndexing

public boolean isIndexing()

wrapStreamForIndexing

protected org.apache.lucene.analysis.TokenStream wrapStreamForIndexing(org.apache.lucene.analysis.TokenStream input)

Applies a SubtokenFilter to the input token stream at document indexing time.

Parameters:

input - token stream

Returns:

A TokenStream filtered by the sub-token filter during indexing, otherwise the input token stream is returned.

wrapStreamForWilcardSearchSupport

protected org.apache.lucene.analysis.TokenStream wrapStreamForWilcardSearchSupport(org.apache.lucene.analysis.TokenStream input)

Applies a KeywordRepeatFilter to the input token stream at document indexing time to store the original tokens as keywords before any stemming filter is applied and therefore support wildcard searches and exact phrase queries on document fields.

Parameters:

input - token stream

Returns:

A TokenStream filtered by the sub-token filter during indexing, otherwise the input token stream is returned.

reusableTokenStream

public final org.apache.lucene.analysis.TokenStream reusableTokenStream(String fieldName,
                                                                        Reader reader)
                                                                 throws IOException

Overrides:

reusableTokenStream in class org.apache.lucene.analysis.Analyzer

Throws:

IOException