Package org.apache.lucene.analysis.cjk

Class CJKAnalyzer

java.lang.Object

org.apache.lucene.analysis.Analyzer

org.apache.lucene.analysis.util.StopwordAnalyzerBase

org.apache.lucene.analysis.cjk.CJKAnalyzer

All Implemented Interfaces:

Closeable, AutoCloseable

public final class CJKAnalyzer
extends StopwordAnalyzerBase

An Analyzer that tokenizes text with StandardTokenizer, normalizes content with CJKWidthFilter, folds case with LowerCaseFilter, forms bigrams of CJK with CJKBigramFilter, and filters stopwords with StopFilter

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.analysis.Analyzer

Analyzer.GlobalReuseStrategy, Analyzer.PerFieldReuseStrategy, Analyzer.ReuseStrategy, Analyzer.TokenStreamComponents

Field Summary

Fields

Modifier and Type	Field	Description
static final String	DEFAULT_STOPWORD_FILE	File containing default CJK stopwords.

Fields inherited from class org.apache.lucene.analysis.Analyzer

GLOBAL_REUSE_STRATEGY, PER_FIELD_REUSE_STRATEGY

Constructor Summary

Constructors

Constructor	Description
CJKAnalyzer(Version matchVersion)	Builds an analyzer which removes words in getDefaultStopSet().
CJKAnalyzer(Version matchVersion, CharArraySet stopwords)	Builds an analyzer with the given stop words

Method Summary

Modifier and Type	Method	Description
static CharArraySet	getDefaultStopSet()	Returns an unmodifiable instance of the default stop-words set.

Methods inherited from class org.apache.lucene.analysis.util.StopwordAnalyzerBase

getStopwordSet

Methods inherited from class org.apache.lucene.analysis.Analyzer

close, getOffsetGap, getPositionIncrementGap, getReuseStrategy, tokenStream, tokenStream

Methods inherited from class java.lang.Object

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

Field Details

DEFAULT_STOPWORD_FILE

public static final String DEFAULT_STOPWORD_FILE

File containing default CJK stopwords.

Currently it contains some common English words that are not usually useful for searching and some double-byte interpunctions.

See Also:

• Constant Field Values

Constructor Details

CJKAnalyzer

public CJKAnalyzer(Version matchVersion)

Builds an analyzer which removes words in getDefaultStopSet().

CJKAnalyzer

public CJKAnalyzer(Version matchVersion,
 CharArraySet stopwords)

Builds an analyzer with the given stop words

Parameters:

matchVersion - lucene compatibility version

stopwords - a stopword set

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.