org.apache.lucene.analysis.standard

## Class StandardAnalyzer

- java.lang.Object
- - org.apache.lucene.analysis.Analyzer
  - - org.apache.lucene.analysis.StopwordAnalyzerBase
    - - org.apache.lucene.analysis.standard.StandardAnalyzer

- All Implemented Interfaces:
    Closeable, AutoCloseable

      public final class StandardAnalyzer
      extends StopwordAnalyzerBase

  Filters `StandardTokenizer` with `LowerCaseFilter` and `StopFilter`, using a configurable list of stop words.
  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 int` | `DEFAULT_MAX_TOKEN_LENGTH` Default maximum allowed token length

    - ### 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
    `StandardAnalyzer()` Builds an analyzer with no stop words.
    `StandardAnalyzer(CharArraySet stopWords)` Builds an analyzer with the given stop words.
    `StandardAnalyzer(Reader stopwords)` Builds an analyzer with the stop words from the given reader.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `protected Analyzer.TokenStreamComponents` | `createComponents(String fieldName)` Creates a new `Analyzer.TokenStreamComponents` instance for this analyzer.
    `int` | `getMaxTokenLength()` Returns the current maximum token length
    `protected TokenStream` | `normalize(String fieldName, TokenStream in)` Wrap the given `TokenStream` in order to apply normalization filters.
    `void` | `setMaxTokenLength(int length)` Set the max allowed token length.

    - ### 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_MAX_TOKEN_LENGTH

          public static final int DEFAULT_MAX_TOKEN_LENGTH

      Default maximum allowed token length
      See Also:
        Constant Field Values

  - ### Constructor Detail

    - #### StandardAnalyzer

          public StandardAnalyzer(CharArraySet stopWords)

      Builds an analyzer with the given stop words.
      Parameters:
        `stopWords` - stop words

    - #### StandardAnalyzer

          public StandardAnalyzer()

      Builds an analyzer with no stop words.

    - #### StandardAnalyzer

          public StandardAnalyzer(Reader stopwords)
                           throws IOException

      Builds an analyzer with the stop words from the given reader.
      Parameters:
        `stopwords` - Reader to read stop words from
      Throws:
        `IOException`
      See Also:
        `WordlistLoader.getWordSet(Reader)`

  - ### Method Detail

    - #### setMaxTokenLength

          public void setMaxTokenLength(int length)

      Set the max allowed token length. Tokens larger than this will be chopped up at this token length and emitted as multiple tokens. If you need to skip such large tokens, you could increase this max length, and then use `LengthFilter` to remove long tokens. The default is `DEFAULT_MAX_TOKEN_LENGTH`.

    - #### getMaxTokenLength

          public int getMaxTokenLength()

      Returns the current maximum token length
      See Also:
        `setMaxTokenLength(int)`

    - #### createComponents

          protected Analyzer.TokenStreamComponents createComponents(String fieldName)

      Description copied from class: `Analyzer`
      Creates a new `Analyzer.TokenStreamComponents` instance for this analyzer.
      Specified by:
        `createComponents` in class `Analyzer`
      Parameters:
        `fieldName` - the name of the fields content passed to the `Analyzer.TokenStreamComponents` sink as a reader
      Returns:
        the `Analyzer.TokenStreamComponents` for this analyzer.

    - #### normalize

          protected TokenStream normalize(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`

Copyright © 2000-2021 Apache Software Foundation. All Rights Reserved.