org.apache.lucene.analysis.miscellaneous

Class PerFieldAnalyzerWrapper

java.lang.Object

org.apache.lucene.analysis.Analyzer

org.apache.lucene.analysis.AnalyzerWrapper

org.apache.lucene.analysis.DelegatingAnalyzerWrapper

org.apache.lucene.analysis.miscellaneous.PerFieldAnalyzerWrapper

All Implemented Interfaces:

Closeable, AutoCloseable

public final class PerFieldAnalyzerWrapper
extends DelegatingAnalyzerWrapper

This analyzer is used to facilitate scenarios where different fields require different analysis techniques. Use the Map argument in PerFieldAnalyzerWrapper(Analyzer, java.util.Map) to add non-default analyzers for fields.

Example usage:

 Map<String,Analyzer> analyzerPerField = new HashMap<>();
 analyzerPerField.put("firstname", new KeywordAnalyzer());
 analyzerPerField.put("lastname", new KeywordAnalyzer());

 PerFieldAnalyzerWrapper aWrapper =
   new PerFieldAnalyzerWrapper(new StandardAnalyzer(version), analyzerPerField);
 
 

In this example, StandardAnalyzer will be used for all fields except "firstname" and "lastname", for which KeywordAnalyzer will be used.

A PerFieldAnalyzerWrapper can be used like any other analyzer, for both indexing and query parsing.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.analysis.Analyzer

Analyzer.ReuseStrategy, Analyzer.TokenStreamComponents

Field Summary

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

GLOBAL_REUSE_STRATEGY, PER_FIELD_REUSE_STRATEGY

Constructor Summary

Constructors

Constructor and Description
PerFieldAnalyzerWrapper(Analyzer defaultAnalyzer) Constructs with default analyzer.
PerFieldAnalyzerWrapper(Analyzer defaultAnalyzer, Map<String,Analyzer> fieldAnalyzers) Constructs with default analyzer and a map of analyzers to use for specific fields.

Method Summary

Modifier and Type	Method and Description
protected Analyzer	getWrappedAnalyzer(String fieldName)
String	toString()

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

wrapComponents, wrapReader, wrapReaderForNormalization, wrapTokenStreamForNormalization

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

attributeFactory, createComponents, getOffsetGap, getPositionIncrementGap, initReader, initReaderForNormalization, normalize

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

close, getReuseStrategy, getVersion, normalize, setVersion, tokenStream, tokenStream

Methods inherited from class java.lang.Object

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

Constructor Detail

PerFieldAnalyzerWrapper

public PerFieldAnalyzerWrapper(Analyzer defaultAnalyzer)

Constructs with default analyzer.

Parameters:

defaultAnalyzer - Any fields not specifically defined to use a different analyzer will use the one provided here.

PerFieldAnalyzerWrapper

public PerFieldAnalyzerWrapper(Analyzer defaultAnalyzer,
                               Map<String,Analyzer> fieldAnalyzers)

Constructs with default analyzer and a map of analyzers to use for specific fields.

Parameters:

defaultAnalyzer - Any fields not specifically defined to use a different analyzer will use the one provided here.

fieldAnalyzers - a Map (String field name to the Analyzer) to be used for those fields

Method Detail

getWrappedAnalyzer

protected Analyzer getWrappedAnalyzer(String fieldName)

Specified by:

getWrappedAnalyzer in class AnalyzerWrapper

toString

public String toString()

Overrides:

toString in class Object