CommonGramsQueryFilter (Lucene 8.5.1 API)

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, AutoCloseable
```
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.State

Field Summary
- Fields inherited from class org.apache.lucene.analysis.TokenFilter
  input
- Fields inherited from class org.apache.lucene.analysis.TokenStream
  DEFAULT_TOKEN_ATTRIBUTE_FACTORY

Constructor Summary

Constructors
Constructor Description

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

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`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, endAttributes, equals, getAttribute, getAttributeClassesIterator, getAttributeFactory, getAttributeImplsIterator, hasAttribute, hasAttributes, hashCode, reflectAsString, reflectWith, removeAllAttributes, restoreState, toString

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