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:
    Closeable, 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 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

    All Methods Static Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `protected Analyzer.TokenStreamComponents` | `createComponents(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(String fieldName, TokenStream in)`

    - ### 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 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(String fieldName)

      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 `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(String fieldName,
                                          TokenStream in)

      Overrides:
        `normalize` in class `Analyzer`

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