Package 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
  Description
  `static final 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
  Description
  `StandardAnalyzer()`
  Builds an analyzer with no stop words.
  `StandardAnalyzer(Reader stopwords)`
  Builds an analyzer with the stop words from the given reader.
  `StandardAnalyzer(CharArraySet stopWords)`
  Builds an analyzer with the given stop words.

- ## Method Summary

  Modifier and Type
  Method
  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`

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

  `attributeFactory, close, getOffsetGap, getPositionIncrementGap, getReuseStrategy, initReader, initReaderForNormalization, normalize, tokenStream, tokenStream`

  ### Methods inherited from class java.lang.Object

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

- ## Field Details

  - ### DEFAULT_MAX_TOKEN_LENGTH

    public static final int DEFAULT_MAX_TOKEN_LENGTH
    Default maximum allowed token length
    See Also:
      - Constant Field Values

- ## Constructor Details

  - ### 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 Details

  - ### 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`