Module org.apache.lucene.analysis.common

Package org.apache.lucene.analysis.th

Class ThaiAnalyzer

java.lang.Object

org.apache.lucene.analysis.Analyzer

org.apache.lucene.analysis.StopwordAnalyzerBase

org.apache.lucene.analysis.th.ThaiAnalyzer

All Implemented Interfaces:

Closeable, AutoCloseable

public final class ThaiAnalyzer
extends StopwordAnalyzerBase

Analyzer for Thai language. It uses BreakIterator to break words.

Since:

3.1

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static class	ThaiAnalyzer.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 Thai stopwords.
private static final String	STOPWORDS_COMMENT	The comment character in the stopwords file.

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
ThaiAnalyzer()	Builds an analyzer with the default stop words.
ThaiAnalyzer(CharArraySet stopwords)	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

DEFAULT_STOPWORD_FILE

public static final String DEFAULT_STOPWORD_FILE

File containing default Thai stopwords.

See Also:

• Constant Field Values

STOPWORDS_COMMENT

private static final String STOPWORDS_COMMENT

The comment character in the stopwords file. All lines prefixed with this will be ignored.

See Also:

• Constant Field Values

Constructor Details

ThaiAnalyzer

public ThaiAnalyzer()

Builds an analyzer with the default stop words.

ThaiAnalyzer

public ThaiAnalyzer(CharArraySet stopwords)

Builds an analyzer with the given stop words.

Parameters:

stopwords - a stopword set

Method Details

getDefaultStopSet

public static CharArraySet getDefaultStopSet()

Returns an unmodifiable instance of the default stop words set.

Returns:

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 ThaiTokenizer filtered with LowerCaseFilter, DecimalDigitFilter and StopFilter

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