org.apache.lucene.analysis.cz

Class CzechAnalyzer

java.lang.Object

org.apache.lucene.analysis.Analyzer

org.apache.lucene.analysis.StopwordAnalyzerBase

org.apache.lucene.analysis.cz.CzechAnalyzer

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable

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.

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 and Description
static java.lang.String	DEFAULT_STOPWORD_FILE File containing default Czech stopwords.

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 and Description
CzechAnalyzer() Builds an analyzer with the default stop words (getDefaultStopSet()).
CzechAnalyzer(CharArraySet stopwords) Builds an analyzer with the given stop words.
CzechAnalyzer(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

Modifier and Type	Method and Description
protected Analyzer.TokenStreamComponents	createComponents(java.lang.String fieldName) Creates Analyzer.TokenStreamComponents used to tokenize all the text in the provided Reader.
static CharArraySet	getDefaultStopSet() Returns a set of default Czech-stopwords
protected TokenStream	normalize(java.lang.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, getVersion, initReader, initReaderForNormalization, normalize, setVersion, 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 java.lang.String DEFAULT_STOPWORD_FILE

File containing default Czech stopwords.

See Also:

Constant Field Values

Constructor Detail

CzechAnalyzer

public CzechAnalyzer()

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

CzechAnalyzer

public CzechAnalyzer(CharArraySet stopwords)

Builds an analyzer with the given stop words.

Parameters:

stopwords - a stopword set

CzechAnalyzer

public CzechAnalyzer(CharArraySet stopwords,
                     CharArraySet stemExclusionTable)

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

Parameters:

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(java.lang.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, StopFilter , and CzechStemFilter (only if version is >= LUCENE_31). If a stem exclusion set is provided via CzechAnalyzer(CharArraySet, CharArraySet) a SetKeywordMarkerFilter is added before CzechStemFilter.

normalize

protected TokenStream normalize(java.lang.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