Class CzechAnalyzer

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 LuceneVersion 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)

Inheritance
System.Object
Analyzer
StopwordAnalyzerBase
CzechAnalyzer
Inherited Members
Lucene.Net.Analysis.Analyzer.NewAnonymous(Func<, , >)
Lucene.Net.Analysis.Analyzer.NewAnonymous(Func<, , >, Lucene.Net.Analysis.ReuseStrategy)
Lucene.Net.Analysis.Analyzer.NewAnonymous(Func<, , >, Func<, , >)
Lucene.Net.Analysis.Analyzer.NewAnonymous(Func<, , >, Func<, , >, Lucene.Net.Analysis.ReuseStrategy)
Namespace: Lucene.Net.Analysis.Cz
Assembly: Lucene.Net.Analysis.Common.dll
Syntax
public sealed class CzechAnalyzer : StopwordAnalyzerBase

Constructors

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CzechAnalyzer(LuceneVersion)

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

Declaration
public CzechAnalyzer(LuceneVersion matchVersion)
Parameters
Type Name Description
LuceneVersion matchVersion

LuceneVersion to match

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CzechAnalyzer(LuceneVersion, CharArraySet)

Builds an analyzer with the given stop words.

Declaration
public CzechAnalyzer(LuceneVersion matchVersion, CharArraySet stopwords)
Parameters
Type Name Description
LuceneVersion matchVersion

LuceneVersion to match

CharArraySet stopwords

a stopword set

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CzechAnalyzer(LuceneVersion, CharArraySet, CharArraySet)

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

Declaration
public CzechAnalyzer(LuceneVersion matchVersion, CharArraySet stopwords, CharArraySet stemExclusionTable)
Parameters
Type Name Description
LuceneVersion matchVersion

LuceneVersion to match

CharArraySet stopwords

a stopword set

CharArraySet stemExclusionTable

a stemming exclusion set

Fields

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DEFAULT_STOPWORD_FILE

File containing default Czech stopwords.

Declaration
public const string DEFAULT_STOPWORD_FILE = null
Field Value
Type Description
System.String

Properties

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DefaultStopSet

Returns a set of default Czech-stopwords

Declaration
public static CharArraySet DefaultStopSet { get; }
Property Value
Type Description
CharArraySet

a set of default Czech-stopwords

Methods

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CreateComponents(String, TextReader)

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

Declaration
protected override TokenStreamComponents CreateComponents(string fieldName, TextReader reader)
Parameters
Type Name Description
System.String fieldName
TextReader reader
Returns
Type Description
TokenStreamComponents

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(LuceneVersion, CharArraySet, CharArraySet) a SetKeywordMarkerFilter is added before CzechStemFilter.