org.apache.lucene.analysis.cz

Class CzechAnalyzer

java.lang.Object

org.apache.lucene.analysis.Analyzer

org.apache.lucene.analysis.util.StopwordAnalyzerBase

org.apache.lucene.analysis.cz.CzechAnalyzer

All Implemented Interfaces:

Closeable

public final class CzechAnalyzer
extends StopwordAnalyzerBase

Analyzer for Czech language.

Supports an external list of stopwords (words that will not be indexed at all). A default set of stopwords is used unless an alternative list is specified.

You must specify the required Version compatibility when creating CzechAnalyzer:

• As of 3.1, words are stemmed with CzechStemFilter
• As of 2.9, StopFilter preserves position increments
• As of 2.4, Tokens incorrectly identified as acronyms are corrected (see LUCENE-1068)

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 and Description
static String	DEFAULT_STOPWORD_FILE File containing default Czech stopwords.

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

matchVersion, stopwords

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

GLOBAL_REUSE_STRATEGY, PER_FIELD_REUSE_STRATEGY

Constructor Summary

Constructors

Constructor and Description
CzechAnalyzer(Version matchVersion) Builds an analyzer with the default stop words (getDefaultStopSet()).
CzechAnalyzer(Version matchVersion, CharArraySet stopwords) Builds an analyzer with the given stop words.
CzechAnalyzer(Version matchVersion, CharArraySet stopwords, CharArraySet stemExclusionTable) Builds an analyzer with the given stop words and a set of work to be excluded from the CzechStemFilter.

Method Summary

Methods

Modifier and Type	Method and Description
protected Analyzer.TokenStreamComponents	createComponents(String fieldName, Reader reader) Creates Analyzer.TokenStreamComponents used to tokenize all the text in the provided Reader.
static CharArraySet	getDefaultStopSet() Returns a set of default Czech-stopwords

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

getStopwordSet, loadStopwordSet, loadStopwordSet, loadStopwordSet

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

close, getOffsetGap, getPositionIncrementGap, getReuseStrategy, initReader, tokenStream, tokenStream

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_STOPWORD_FILE

public static final String DEFAULT_STOPWORD_FILE

File containing default Czech stopwords.

See Also:

Constant Field Values

Constructor Detail

CzechAnalyzer

public CzechAnalyzer(Version matchVersion)

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

Parameters:

matchVersion - Lucene version to match See above

CzechAnalyzer

public CzechAnalyzer(Version matchVersion,
             CharArraySet stopwords)

Builds an analyzer with the given stop words.

Parameters:

matchVersion - Lucene version to match See above

stopwords - a stopword set

CzechAnalyzer

public CzechAnalyzer(Version matchVersion,
             CharArraySet stopwords,
             CharArraySet stemExclusionTable)

Builds an analyzer with the given stop words and a set of work to be excluded from the CzechStemFilter.

Parameters:

matchVersion - Lucene version to match See above

stopwords - a stopword set

stemExclusionTable - a stemming exclusion set

Method Detail

getDefaultStopSet

public static final CharArraySet getDefaultStopSet()

Returns a set of default Czech-stopwords

Returns:

a set of default Czech-stopwords

createComponents

protected Analyzer.TokenStreamComponents createComponents(String fieldName,
                                              Reader reader)

Creates Analyzer.TokenStreamComponents used to tokenize all the text in the provided Reader.

Specified by:

createComponents in class Analyzer

Returns:

Analyzer.TokenStreamComponents built from a StandardTokenizer filtered with StandardFilter, LowerCaseFilter, StopFilter , and CzechStemFilter (only if version is >= LUCENE_31). If a version is >= LUCENE_31 and a stem exclusion set is provided via CzechAnalyzer(Version, CharArraySet, CharArraySet) a SetKeywordMarkerFilter is added before CzechStemFilter.