org.apache.lucene.analysis.de

## Class GermanStemFilter

- java.lang.Object
- - org.apache.lucene.util.AttributeSource
  - - org.apache.lucene.analysis.TokenStream
    - - org.apache.lucene.analysis.TokenFilter
      - - org.apache.lucene.analysis.de.GermanStemFilter

- All Implemented Interfaces:
    Closeable, AutoCloseable

      public final class GermanStemFilter
      extends TokenFilter

  A `TokenFilter` that stems German words.

  It supports a table of words that should not be stemmed at all. The stemmer used can be changed at runtime after the filter object is created (as long as it is a `GermanStemmer`).

  To prevent terms from being stemmed use an instance of `KeywordMarkerFilter` or a custom `TokenFilter` that sets the `KeywordAttribute` before this `TokenStream`.

  See Also:
    `KeywordMarkerFilter`

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from class org.apache.lucene.util.AttributeSource

      `AttributeSource.AttributeFactory, AttributeSource.State`

  - ### Field Summary

    - ### Fields inherited from class org.apache.lucene.analysis.TokenFilter

      `input`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `GermanStemFilter(TokenStream in)` Creates a `GermanStemFilter` instance

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `boolean` | `incrementToken()`
    `void` | `setStemmer(GermanStemmer stemmer)` Set a alternative/custom `GermanStemmer` for this filter.

    - ### Methods inherited from class org.apache.lucene.analysis.TokenFilter

      `close, end, reset`

    - ### Methods inherited from class org.apache.lucene.util.AttributeSource

      `addAttribute, addAttributeImpl, captureState, clearAttributes, cloneAttributes, copyTo, equals, getAttribute, getAttributeClassesIterator, getAttributeFactory, getAttributeImplsIterator, hasAttribute, hasAttributes, hashCode, reflectAsString, reflectWith, restoreState`

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

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

- - ### Constructor Detail

    - #### GermanStemFilter

          public GermanStemFilter(TokenStream in)

      Creates a `GermanStemFilter` instance
      Parameters:
        `in` - the source `TokenStream`

  - ### Method Detail

    - #### incrementToken

          public boolean incrementToken()
                                 throws IOException

      Specified by:
        `incrementToken` in class `TokenStream`
      Returns:
        Returns true for next token in the stream, or false at EOS
      Throws:
        `IOException`

    - #### setStemmer

          public void setStemmer(GermanStemmer stemmer)

      Set a alternative/custom `GermanStemmer` for this filter.

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