NGramTokenFilter (Lucene 3.6.2 API)
Keywords: org.apache.lucene.analysis.ngram.NGramTokenFilter class

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## org.apache.lucene.analysis.ngram
Class NGramTokenFilter

    java.lang.Object
      org.apache.lucene.util.AttributeSource
          org.apache.lucene.analysis.TokenStream
              org.apache.lucene.analysis.TokenFilter
                  org.apache.lucene.analysis.ngram.NGramTokenFilter

All Implemented Interfaces:
  Closeable

    public final class NGramTokenFilter

extends TokenFilter

Tokenizes the input into n-grams of the given size(s).

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.util.AttributeSource
`AttributeSource.AttributeFactory, AttributeSource.State`

Field Summary
`static int` | `DEFAULT_MAX_NGRAM_SIZE`
`static int` | `DEFAULT_MIN_NGRAM_SIZE`

Fields inherited from class org.apache.lucene.analysis.TokenFilter
`input`

Constructor Summary
`NGramTokenFilter(TokenStream input)` Creates NGramTokenFilter with default min and max n-grams.
`NGramTokenFilter(TokenStream input, int minGram, int maxGram)` Creates NGramTokenFilter with given min and max n-grams.

Method Summary
`boolean` | `incrementToken()` Returns the next token in the stream, or null at EOS.
`void` | `reset()` Reset the filter as well as the input TokenStream.

Methods inherited from class org.apache.lucene.analysis.TokenFilter
`close, end`

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, toString`

Methods inherited from class java.lang.Object
`clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

Field Detail

### DEFAULT_MIN_NGRAM_SIZE

    public static final int DEFAULT_MIN_NGRAM_SIZE

See Also:
  Constant Field Values

### DEFAULT_MAX_NGRAM_SIZE

    public static final int DEFAULT_MAX_NGRAM_SIZE

See Also:
  Constant Field Values

Constructor Detail

### NGramTokenFilter

    public NGramTokenFilter(TokenStream input,
                            int minGram,
                            int maxGram)

  Creates NGramTokenFilter with given min and max n-grams.

  Parameters:
    `input` - `TokenStream` holding the input to be tokenized
    `minGram` - the smallest n-gram to generate
    `maxGram` - the largest n-gram to generate

### NGramTokenFilter

    public NGramTokenFilter(TokenStream input)

  Creates NGramTokenFilter with default min and max n-grams.

  Parameters:
    `input` - `TokenStream` holding the input to be tokenized

Method Detail

### incrementToken

    public final boolean incrementToken()
                                 throws IOException

  Returns the next token in the stream, or null at EOS.

  Specified by:
    `incrementToken` in class `TokenStream`
  Returns:
    false for end of stream; true otherwise
  Throws:
    `IOException`

### reset

    public void reset()
               throws IOException

  Description copied from class: `TokenFilter`
  Reset the filter as well as the input TokenStream.

  Overrides:
    `reset` in class `TokenFilter`
  Throws:
    `IOException`

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