org.apache.lucene.analysis.bn

Class BengaliAnalyzer

java.lang.Object

org.apache.lucene.analysis.Analyzer

org.apache.lucene.analysis.StopwordAnalyzerBase

org.apache.lucene.analysis.bn.BengaliAnalyzer

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable

public final class BengaliAnalyzer
extends StopwordAnalyzerBase

Analyzer for Bengali.

Since:

7.1.0

Nested Class Summary

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

Analyzer.ReuseStrategy, Analyzer.TokenStreamComponents

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	DEFAULT_STOPWORD_FILE File containing default Bengali stopwords.

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

stopwords

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

GLOBAL_REUSE_STRATEGY, PER_FIELD_REUSE_STRATEGY

Constructor Summary

Constructors

Constructor and Description
BengaliAnalyzer() Builds an analyzer with the default stop words: DEFAULT_STOPWORD_FILE.
BengaliAnalyzer(CharArraySet stopwords) Builds an analyzer with the given stop words
BengaliAnalyzer(CharArraySet stopwords, CharArraySet stemExclusionSet) Builds an analyzer with the given stop words

Method Summary

Modifier and Type	Method and Description
protected Analyzer.TokenStreamComponents	createComponents(java.lang.String fieldName) Creates Analyzer.TokenStreamComponents used to tokenize all the text in the provided Reader.
static CharArraySet	getDefaultStopSet() Returns an unmodifiable instance of the default stop-words set.
protected TokenStream	normalize(java.lang.String fieldName, TokenStream in) Wrap the given TokenStream in order to apply normalization filters.

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

getStopwordSet, loadStopwordSet, loadStopwordSet, loadStopwordSet

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

attributeFactory, close, getOffsetGap, getPositionIncrementGap, getReuseStrategy, getVersion, initReader, initReaderForNormalization, normalize, setVersion, tokenStream, tokenStream

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_STOPWORD_FILE

public static final java.lang.String DEFAULT_STOPWORD_FILE

File containing default Bengali stopwords. Default stopword list is from http://members.unine.ch/jacques.savoy/clef/bengaliST.txt The stopword list is BSD-Licensed.

See Also:

Constant Field Values

Constructor Detail

BengaliAnalyzer

public BengaliAnalyzer(CharArraySet stopwords,
                       CharArraySet stemExclusionSet)

Builds an analyzer with the given stop words

Parameters:

stopwords - a stopword set

stemExclusionSet - a stemming exclusion set

BengaliAnalyzer

public BengaliAnalyzer(CharArraySet stopwords)

Builds an analyzer with the given stop words

Parameters:

stopwords - a stopword set

BengaliAnalyzer

public BengaliAnalyzer()

Builds an analyzer with the default stop words: DEFAULT_STOPWORD_FILE.

Method Detail

getDefaultStopSet

public static CharArraySet getDefaultStopSet()

Returns an unmodifiable instance of the default stop-words set.

Returns:

an unmodifiable instance of the default stop-words set.

createComponents

protected Analyzer.TokenStreamComponents createComponents(java.lang.String fieldName)

Creates Analyzer.TokenStreamComponents used to tokenize all the text in the provided Reader.

Specified by:

createComponents in class Analyzer

Parameters:

fieldName - the name of the fields content passed to the Analyzer.TokenStreamComponents sink as a reader

Returns:

Analyzer.TokenStreamComponents built from a StandardTokenizer filtered with LowerCaseFilter, DecimalDigitFilter, IndicNormalizationFilter, BengaliNormalizationFilter, SetKeywordMarkerFilter if a stem exclusion set is provided, BengaliStemFilter, and Bengali Stop words

normalize

protected TokenStream normalize(java.lang.String fieldName,
                                TokenStream in)

Description copied from class: Analyzer

Wrap the given TokenStream in order to apply normalization filters. The default implementation returns the TokenStream as-is. This is used by Analyzer.normalize(String, String).

Overrides:

normalize in class Analyzer