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 ClassesNested classes/interfaces inherited from class org.apache.lucene.analysis.Analyzer
Analyzer.ReuseStrategy, Analyzer.TokenStreamComponents
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Field Summary
FieldsModifier and TypeFieldDescriptionstatic final String
File containing default Dutch stopwords.private final CharArraySet
Contains words that should be indexed but not stemmed.private final StemmerOverrideFilter.StemmerOverrideMap
private final CharArraySet
Contains the stopwords used with the StopFilter.Fields inherited from class org.apache.lucene.analysis.Analyzer
GLOBAL_REUSE_STRATEGY, PER_FIELD_REUSE_STRATEGY
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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.TokenStreamComponents
createComponents
(String fieldName) Returns a (possibly reused)TokenStream
which tokenizes all the text in the providedReader
.static CharArraySet
Returns an unmodifiable instance of the default stop-words set.protected TokenStream
normalize
(String fieldName, TokenStream in) Wrap the givenTokenStream
in order to apply normalization filters.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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stoptable
Contains the stopwords used with the StopFilter. -
excltable
Contains words that should be indexed but not stemmed. -
stemdict
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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
-
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)TokenStream
which tokenizes 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:
- A
TokenStream
built from aStandardTokenizer
filtered withLowerCaseFilter
,StopFilter
,SetKeywordMarkerFilter
if a stem exclusion set is provided,StemmerOverrideFilter
, andSnowballFilter
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normalize
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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