Package org.apache.lucene.analysis.nl
Class DutchAnalyzer
java.lang.Object
org.apache.lucene.analysis.Analyzer
org.apache.lucene.analysis.nl.DutchAnalyzer
- All Implemented Interfaces:
Closeable,AutoCloseable
Analyzer for Dutch language.
Supports an external list of stopwords (words that will not be indexed at all), an external list of exclusions (word that will not be stemmed, but indexed) and an external list of word-stem pairs that overrule the algorithm (dictionary stemming). A default set of stopwords is used unless an alternative list is specified, but the exclusion list is empty by default.
- Since:
- 3.1
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Nested Class Summary
Nested classes/interfaces inherited from class org.apache.lucene.analysis.Analyzer
Analyzer.ReuseStrategy, Analyzer.TokenStreamComponents -
Field Summary
FieldsFields inherited from class org.apache.lucene.analysis.Analyzer
GLOBAL_REUSE_STRATEGY, PER_FIELD_REUSE_STRATEGY -
Constructor Summary
ConstructorsConstructorDescriptionBuilds an analyzer with the default stop words (getDefaultStopSet()) and a few default entries for the stem exclusion table.DutchAnalyzer(CharArraySet stopwords) DutchAnalyzer(CharArraySet stopwords, CharArraySet stemExclusionTable) DutchAnalyzer(CharArraySet stopwords, CharArraySet stemExclusionTable, CharArrayMap<String> stemOverrideDict) -
Method Summary
Modifier and TypeMethodDescriptionprotected Analyzer.TokenStreamComponentscreateComponents(String fieldName) Returns a (possibly reused)TokenStreamwhich tokenizes all the text in the providedReader.static CharArraySetReturns an unmodifiable instance of the default stop-words set.protected TokenStreamnormalize(String fieldName, TokenStream in) Methods inherited from class org.apache.lucene.analysis.Analyzer
attributeFactory, close, getOffsetGap, getPositionIncrementGap, getReuseStrategy, initReader, initReaderForNormalization, normalize, tokenStream, tokenStream
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Field Details
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DEFAULT_STOPWORD_FILE
File containing default Dutch stopwords.- See Also:
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Constructor Details
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DutchAnalyzer
public DutchAnalyzer()Builds an analyzer with the default stop words (getDefaultStopSet()) and a few default entries for the stem exclusion table. -
DutchAnalyzer
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DutchAnalyzer
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DutchAnalyzer
public DutchAnalyzer(CharArraySet stopwords, CharArraySet stemExclusionTable, CharArrayMap<String> stemOverrideDict)
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Method Details
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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
Returns a (possibly reused)TokenStreamwhich tokenizes all the text in the providedReader.- Specified by:
createComponentsin classAnalyzer- Returns:
- A
TokenStreambuilt from aStandardTokenizerfiltered withLowerCaseFilter,StopFilter,SetKeywordMarkerFilterif a stem exclusion set is provided,StemmerOverrideFilter, andSnowballFilter
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normalize
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