Package org.apache.lucene.analysis.bn
Class BengaliAnalyzer
- java.lang.Object
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- org.apache.lucene.analysis.Analyzer
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- org.apache.lucene.analysis.StopwordAnalyzerBase
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- org.apache.lucene.analysis.bn.BengaliAnalyzer
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- All Implemented Interfaces:
java.io.Closeable
,java.lang.AutoCloseable
public final class BengaliAnalyzer extends StopwordAnalyzerBase
Analyzer for Bengali.- Since:
- 7.1.0
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Nested Class Summary
Nested Classes Modifier and Type Class Description private static class
BengaliAnalyzer.DefaultSetHolder
Atomically loads the DEFAULT_STOP_SET in a lazy fashion once the outer class accesses the static final set the first time.;-
Nested classes/interfaces inherited from class org.apache.lucene.analysis.Analyzer
Analyzer.ReuseStrategy, Analyzer.TokenStreamComponents
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Field Summary
Fields Modifier and Type Field Description static java.lang.String
DEFAULT_STOPWORD_FILE
File containing default Bengali stopwords.private CharArraySet
stemExclusionSet
private static java.lang.String
STOPWORDS_COMMENT
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Fields inherited from class org.apache.lucene.analysis.StopwordAnalyzerBase
stopwords
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Fields inherited from class org.apache.lucene.analysis.Analyzer
GLOBAL_REUSE_STRATEGY, PER_FIELD_REUSE_STRATEGY
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Constructor Summary
Constructors Constructor Description BengaliAnalyzer()
Builds an analyzer with the default stop words:DEFAULT_STOPWORD_FILE
.BengaliAnalyzer(CharArraySet stopwords)
Builds an analyzer with the given stop wordsBengaliAnalyzer(CharArraySet stopwords, CharArraySet stemExclusionSet)
Builds an analyzer with the given stop words
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description protected Analyzer.TokenStreamComponents
createComponents(java.lang.String fieldName)
CreatesAnalyzer.TokenStreamComponents
used to tokenize all the text in the providedReader
.static CharArraySet
getDefaultStopSet()
Returns an unmodifiable instance of the default stop-words set.protected TokenStream
normalize(java.lang.String fieldName, TokenStream in)
Wrap the givenTokenStream
in order to apply normalization filters.-
Methods inherited from class org.apache.lucene.analysis.StopwordAnalyzerBase
getStopwordSet, loadStopwordSet, loadStopwordSet, loadStopwordSet
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Methods inherited from class org.apache.lucene.analysis.Analyzer
attributeFactory, close, getOffsetGap, getPositionIncrementGap, getReuseStrategy, getVersion, initReader, initReaderForNormalization, normalize, setVersion, tokenStream, tokenStream
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Field Detail
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stemExclusionSet
private final CharArraySet stemExclusionSet
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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
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STOPWORDS_COMMENT
private static final java.lang.String STOPWORDS_COMMENT
- See Also:
- Constant Field Values
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Constructor Detail
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BengaliAnalyzer
public BengaliAnalyzer(CharArraySet stopwords, CharArraySet stemExclusionSet)
Builds an analyzer with the given stop words- Parameters:
stopwords
- a stopword setstemExclusionSet
- a stemming exclusion set
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BengaliAnalyzer
public BengaliAnalyzer(CharArraySet stopwords)
Builds an analyzer with the given stop words- Parameters:
stopwords
- a stopword set
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BengaliAnalyzer
public BengaliAnalyzer()
Builds an analyzer with the default stop words:DEFAULT_STOPWORD_FILE
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Method Detail
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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.
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createComponents
protected Analyzer.TokenStreamComponents createComponents(java.lang.String fieldName)
CreatesAnalyzer.TokenStreamComponents
used to tokenize all the text in the providedReader
.- Specified by:
createComponents
in classAnalyzer
- Parameters:
fieldName
- the name of the fields content passed to theAnalyzer.TokenStreamComponents
sink as a reader- Returns:
Analyzer.TokenStreamComponents
built from aStandardTokenizer
filtered withLowerCaseFilter
,DecimalDigitFilter
,IndicNormalizationFilter
,BengaliNormalizationFilter
,SetKeywordMarkerFilter
if a stem exclusion set is provided,BengaliStemFilter
, and Bengali Stop words
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normalize
protected TokenStream normalize(java.lang.String fieldName, TokenStream in)
Description copied from class:Analyzer
Wrap the givenTokenStream
in order to apply normalization filters. The default implementation returns theTokenStream
as-is. This is used byAnalyzer.normalize(String, String)
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