Module org.apache.lucene.analysis.common

Package org.apache.lucene.analysis.classic

Class ClassicAnalyzer

java.lang.Object

org.apache.lucene.analysis.Analyzer

org.apache.lucene.analysis.StopwordAnalyzerBase

org.apache.lucene.analysis.classic.ClassicAnalyzer

All Implemented Interfaces:

Closeable, AutoCloseable

public final class ClassicAnalyzer
extends StopwordAnalyzerBase

Filters ClassicTokenizer with ClassicFilter, LowerCaseFilter and StopFilter, using a list of English stop words.

ClassicAnalyzer was named StandardAnalyzer in Lucene versions prior to 3.1. As of 3.1, StandardAnalyzer implements Unicode text segmentation, as specified by UAX#29.

Since:

3.1

Nested Class Summary

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 int	DEFAULT_MAX_TOKEN_LENGTH	Default maximum allowed token length
private int	maxTokenLength
static final CharArraySet	STOP_WORDS_SET	An unmodifiable set containing some common English words that are usually not useful for searching.

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
ClassicAnalyzer()	Builds an analyzer with the default stop words (STOP_WORDS_SET).
ClassicAnalyzer(Reader stopwords)	Builds an analyzer with the stop words from the given reader.
ClassicAnalyzer(CharArraySet stopWords)	Builds an analyzer with the given stop words.

Method Summary

Modifier and Type	Method	Description
protected Analyzer.TokenStreamComponents	createComponents(String fieldName)	Creates a new Analyzer.TokenStreamComponents instance for this analyzer.
int	getMaxTokenLength()
protected TokenStream	normalize(String fieldName, TokenStream in)	Wrap the given TokenStream in order to apply normalization filters.
void	setMaxTokenLength(int length)	Set maximum allowed token length.

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_MAX_TOKEN_LENGTH

public static final int DEFAULT_MAX_TOKEN_LENGTH

Default maximum allowed token length

See Also:

• Constant Field Values

maxTokenLength

private int maxTokenLength

STOP_WORDS_SET

public static final CharArraySet STOP_WORDS_SET

An unmodifiable set containing some common English words that are usually not useful for searching.

Constructor Details

ClassicAnalyzer

public ClassicAnalyzer(CharArraySet stopWords)

Builds an analyzer with the given stop words.

Parameters:

stopWords - stop words

ClassicAnalyzer

public ClassicAnalyzer()

Builds an analyzer with the default stop words (STOP_WORDS_SET).

ClassicAnalyzer

public ClassicAnalyzer(Reader stopwords)
                throws IOException

Builds an analyzer with the stop words from the given reader.

Parameters:

stopwords - Reader to read stop words from

Throws:

IOException

See Also:

• WordlistLoader.getWordSet(Reader)

Method Details

setMaxTokenLength

public void setMaxTokenLength(int length)

Set maximum allowed token length. If a token is seen that exceeds this length then it is discarded. This setting only takes effect the next time tokenStream or tokenStream is called.

getMaxTokenLength

public int getMaxTokenLength()

See Also:

• setMaxTokenLength(int)

createComponents

protected Analyzer.TokenStreamComponents createComponents(String fieldName)

Description copied from class: Analyzer

Creates a new Analyzer.TokenStreamComponents instance for this analyzer.

Specified by:

createComponents in class Analyzer

Parameters:

fieldName - the name of the fields content passed to the Analyzer.TokenStreamComponents sink as a reader

Returns:

the Analyzer.TokenStreamComponents for this analyzer.

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