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## org.apache.lucene.analysis.commongrams
Class CommonGramsQueryFilter

    java.lang.Object
      org.apache.lucene.util.AttributeSource
          org.apache.lucene.analysis.TokenStream
              org.apache.lucene.analysis.TokenFilter
                  org.apache.lucene.analysis.commongrams.CommonGramsQueryFilter

All Implemented Interfaces:
  Closeable

    public final class CommonGramsQueryFilter

extends TokenFilter

Wrap a CommonGramsFilter optimizing phrase queries by only returning single words when they are not a member of a bigram. Example:

- query input to CommonGramsFilter: "the rain in spain falls mainly"
- output of CommomGramsFilter/input to CommonGramsQueryFilter: |"the, "the-rain"|"rain" "rain-in"|"in, "in-spain"|"spain"|"falls"|"mainly"
- output of CommonGramsQueryFilter:"the-rain", "rain-in" ,"in-spain", "falls", "mainly"

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
`CommonGramsQueryFilter(CommonGramsFilter input)` Constructs a new CommonGramsQueryFilter based on the provided CommomGramsFilter

Method Summary
`boolean` | `incrementToken()` Output bigrams whenever possible to optimize queries.
`boolean` | `isGramType()` Convenience method to check if the current type is a gram type
`void` | `reset()`

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`

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

Constructor Detail

### CommonGramsQueryFilter

    public CommonGramsQueryFilter(CommonGramsFilter input)

  Constructs a new CommonGramsQueryFilter based on the provided CommomGramsFilter

  Parameters:
    `input` - CommonGramsFilter the QueryFilter will use

Method Detail

### reset

    public void reset()
               throws IOException

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

### incrementToken

    public boolean incrementToken()
                           throws IOException

  Output bigrams whenever possible to optimize queries. Only output unigrams when they are not a member of a bigram. Example:
  - input: "the rain in spain falls mainly"
  - output:"the-rain", "rain-in" ,"in-spain", "falls", "mainly"

  Specified by:
    `incrementToken` in class `TokenStream`
  Throws:
    `IOException`

### isGramType

    public boolean isGramType()

  Convenience method to check if the current type is a gram type

  Returns:
    `true` if the current type is a gram type, `false` otherwise

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