Module org.apache.lucene.analysis.common

Package org.apache.lucene.analysis.ta

Class TamilAnalyzer

java.lang.Object

org.apache.lucene.analysis.Analyzer

org.apache.lucene.analysis.StopwordAnalyzerBase

org.apache.lucene.analysis.ta.TamilAnalyzer

All Implemented Interfaces:

Closeable, AutoCloseable

public final class TamilAnalyzer
extends StopwordAnalyzerBase

Analyzer for Tamil.

Since:

9.0

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static class	TamilAnalyzer.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

Field Summary

Fields

Modifier and Type	Field	Description
static final String	DEFAULT_STOPWORD_FILE	File containing default Tamil stopwords.
private final CharArraySet	stemExclusionSet
private static final String	STOPWORDS_COMMENT

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

Method Summary

Modifier and Type	Method	Description
protected Analyzer.TokenStreamComponents	createComponents(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(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, initReader, initReaderForNormalization, normalize, tokenStream, tokenStream

Methods inherited from class java.lang.Object

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

Field Details

stemExclusionSet

private final CharArraySet stemExclusionSet

DEFAULT_STOPWORD_FILE

public static final String DEFAULT_STOPWORD_FILE

File containing default Tamil stopwords.

Default stopword list is from https://github.com/AshokR/TamilNLP (Apache 2 License)

See Also:

• Constant Field Values

STOPWORDS_COMMENT

private static final String STOPWORDS_COMMENT

See Also:

• Constant Field Values

Constructor Details

TamilAnalyzer

public TamilAnalyzer(CharArraySet stopwords,
 CharArraySet stemExclusionSet)

Builds an analyzer with the given stop words

Parameters:

stopwords - a stopword set

stemExclusionSet - a stemming exclusion set

TamilAnalyzer

public TamilAnalyzer(CharArraySet stopwords)

Builds an analyzer with the given stop words

Parameters:

stopwords - a stopword set

TamilAnalyzer

public TamilAnalyzer()

Builds an analyzer with the default stop words: DEFAULT_STOPWORD_FILE.

Method Details

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(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, SetKeywordMarkerFilter if a stem exclusion set is provided, SnowballFilter, and Tamil Stop words

normalize

protected TokenStream normalize(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