org.apache.lucene.analysis.cz

Class CzechAnalyzer

java.lang.Object

org.apache.lucene.analysis.Analyzer

org.apache.lucene.analysis.ReusableAnalyzerBase

org.apache.lucene.analysis.cz.CzechAnalyzer

All Implemented Interfaces:

Closeable

public final class CzechAnalyzer
extends ReusableAnalyzerBase

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.ReusableAnalyzerBase

ReusableAnalyzerBase.TokenStreamComponents

Field Summary

Fields

Modifier and Type	Field and Description
static String[]	CZECH_STOP_WORDS Deprecated. use getDefaultStopSet() instead
static String	DEFAULT_STOPWORD_FILE File containing default Czech stopwords.

Constructor Summary

Constructors

Constructor and Description
CzechAnalyzer(Version matchVersion) Builds an analyzer with the default stop words (getDefaultStopSet()).
CzechAnalyzer(Version matchVersion, File stopwords) Deprecated. use CzechAnalyzer(Version, Set) instead
CzechAnalyzer(Version matchVersion, HashSet<?> stopwords) Deprecated. use CzechAnalyzer(Version, Set) instead
CzechAnalyzer(Version matchVersion, Set<?> stopwords) Builds an analyzer with the given stop words.
CzechAnalyzer(Version matchVersion, Set<?> stopwords, Set<?> stemExclusionTable) Builds an analyzer with the given stop words and a set of work to be excluded from the CzechStemFilter.
CzechAnalyzer(Version matchVersion, String... stopwords) Deprecated. use CzechAnalyzer(Version, Set) instead

Method Summary

Methods

Modifier and Type	Method and Description
protected ReusableAnalyzerBase.TokenStreamComponents	createComponents(String fieldName, Reader reader) Creates ReusableAnalyzerBase.TokenStreamComponents used to tokenize all the text in the provided Reader.
static Set<?>	getDefaultStopSet() Returns a set of default Czech-stopwords
void	loadStopWords(InputStream wordfile, String encoding) Deprecated. use WordlistLoader.getWordSet(Reader, String, Version) and CzechAnalyzer(Version, Set) instead

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

initReader, reusableTokenStream, tokenStream

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

close, getOffsetGap, getPositionIncrementGap, getPreviousTokenStream, setPreviousTokenStream

Methods inherited from class java.lang.Object

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

Field Detail

CZECH_STOP_WORDS

@Deprecated
public static final String[] CZECH_STOP_WORDS

Deprecated. use getDefaultStopSet() instead

List of typical stopwords.

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,
             Set<?> 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,
             Set<?> stopwords,
             Set<?> 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

CzechAnalyzer

@Deprecated
public CzechAnalyzer(Version matchVersion,
                        String... stopwords)

Deprecated. use CzechAnalyzer(Version, Set) instead

Builds an analyzer with the given stop words.

Parameters:

matchVersion - Lucene version to match See above

stopwords - a stopword set

CzechAnalyzer

@Deprecated
public CzechAnalyzer(Version matchVersion,
                        HashSet<?> stopwords)

Deprecated. use CzechAnalyzer(Version, Set) instead

Builds an analyzer with the given stop words.

Parameters:

matchVersion - Lucene version to match See above

stopwords - a stopword set

CzechAnalyzer

@Deprecated
public CzechAnalyzer(Version matchVersion,
                        File stopwords)
              throws IOException

Deprecated. use CzechAnalyzer(Version, Set) instead

Builds an analyzer with the given stop words.

Parameters:

matchVersion - Lucene version to match See above

stopwords - a file containing stopwords

Throws:

IOException

Method Detail

getDefaultStopSet

public static final Set<?> getDefaultStopSet()

Returns a set of default Czech-stopwords

Returns:

a set of default Czech-stopwords

loadStopWords

@Deprecated
public void loadStopWords(InputStream wordfile,
                            String encoding)

Deprecated. use WordlistLoader.getWordSet(Reader, String, Version) and CzechAnalyzer(Version, Set) instead

Loads stopwords hash from resource stream (file, database...).

Parameters:

wordfile - File containing the wordlist

encoding - Encoding used (win-1250, iso-8859-2, ...), null for default system encoding

createComponents

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

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

Specified by:

createComponents in class ReusableAnalyzerBase

Parameters:

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

reader - the reader passed to the Tokenizer constructor

Returns:

ReusableAnalyzerBase.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, Set, Set) a KeywordMarkerFilter is added before CzechStemFilter.