Package org.apache.lucene.analysis.cjk
Class CJKAnalyzer
- 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.cjk.CJKAnalyzer
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- All Implemented Interfaces:
java.io.Closeable
,java.lang.AutoCloseable
public final class CJKAnalyzer extends StopwordAnalyzerBase
AnAnalyzer
that tokenizes text withStandardTokenizer
, normalizes content withCJKWidthFilter
, folds case withLowerCaseFilter
, forms bigrams of CJK withCJKBigramFilter
, and filters stopwords withStopFilter
- Since:
- 3.1
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Nested Class Summary
Nested Classes Modifier and Type Class Description private static class
CJKAnalyzer.DefaultSetHolder
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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 CJK stopwords.-
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 CJKAnalyzer()
Builds an analyzer which removes words ingetDefaultStopSet()
.CJKAnalyzer(CharArraySet stopwords)
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)
Creates a newAnalyzer.TokenStreamComponents
instance for this analyzer.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, initReader, initReaderForNormalization, normalize, tokenStream, tokenStream
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Field Detail
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DEFAULT_STOPWORD_FILE
public static final java.lang.String DEFAULT_STOPWORD_FILE
File containing default CJK stopwords.Currently it contains some common English words that are not usually useful for searching and some double-byte interpunctions.
- See Also:
- Constant Field Values
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Constructor Detail
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CJKAnalyzer
public CJKAnalyzer()
Builds an analyzer which removes words ingetDefaultStopSet()
.
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CJKAnalyzer
public CJKAnalyzer(CharArraySet stopwords)
Builds an analyzer with the given stop words- Parameters:
stopwords
- a stopword set
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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)
Description copied from class:Analyzer
Creates a newAnalyzer.TokenStreamComponents
instance for this analyzer.- Specified by:
createComponents
in classAnalyzer
- Parameters:
fieldName
- the name of the fields content passed to theAnalyzer.TokenStreamComponents
sink as a reader- Returns:
- the
Analyzer.TokenStreamComponents
for this analyzer.
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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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