Class CommonGramsQueryFilter

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"

Inheritance
System.Object
AttributeSource
TokenStream
TokenFilter
CommonGramsQueryFilter
Implements
IDisposable
Inherited Members
Namespace: Lucene.Net.Analysis.CommonGrams
Assembly: Lucene.Net.Analysis.Common.dll
Syntax
public sealed class CommonGramsQueryFilter : TokenFilter, IDisposable
Remarks

See:http://hudson.zones.apache.org/hudson/job/Lucene-trunk/javadoc//all/org/apache/lucene/analysis/TokenStream.html and http://svn.apache.org/viewvc/lucene/dev/trunk/lucene/src/java/org/apache/lucene/analysis/package.html?revision=718798

Constructors

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CommonGramsQueryFilter(CommonGramsFilter)

Constructs a new CommonGramsQueryFilter based on the provided CommomGramsFilter

Declaration
public CommonGramsQueryFilter(CommonGramsFilter input)
Parameters
Type Name Description
CommonGramsFilter input

CommonGramsFilter the QueryFilter will use

Properties

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IsGramType

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

Declaration
public bool IsGramType { get; }
Property Value
Type Description
System.Boolean

true if the current type is a gram type, false otherwise

Methods

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IncrementToken()

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"

Declaration
public override bool IncrementToken()
Returns
Type Description
System.Boolean
Overrides
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Reset()

This method is called by a consumer before it begins consumption using IncrementToken().

Resets this stream to a clean state. Stateful implementations must implement this method so that they can be reused, just as if they had been created fresh.

If you override this method, always call base.Reset(), otherwise some internal state will not be correctly reset (e.g., Tokenizer will throw on further usage).

Declaration
public override void Reset()
Overrides
Remarks

NOTE: The default implementation chains the call to the input TokenStream, so be sure to call base.Reset() when overriding this method.

Implements

IDisposable