Class FilteredDocIdSet

Abstract decorator class for a DocIdSet implementation that provides on-demand filtering/validation mechanism on a given DocIdSet.

Technically, this same functionality could be achieved with ChainedFilter (under queries/), however the benefit of this class is it never materializes the full bitset for the filter. Instead, the Match(Int32) method is invoked on-demand, per docID visited during searching. If you know few docIDs will be visited, and the logic behind Match(Int32) is relatively costly, this may be a better way to filter than ChainedFilter.

Inheritance
System.Object
DocIdSet
FilteredDocIdSet
BitsFilteredDocIdSet
Inherited Members
Namespace: Lucene.Net.Search
Assembly: Lucene.Net.dll
Syntax
public abstract class FilteredDocIdSet : DocIdSet

Constructors

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FilteredDocIdSet(DocIdSet)

Constructor.

Declaration
public FilteredDocIdSet(DocIdSet innerSet)
Parameters
Type Name Description
DocIdSet innerSet

Underlying DocIdSet

Properties

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Bits

Declaration
public override IBits Bits { get; }
Property Value
Type Description
IBits
Overrides
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IsCacheable

This DocIdSet implementation is cacheable if the inner set is cacheable.

Declaration
public override bool IsCacheable { get; }
Property Value
Type Description
System.Boolean
Overrides

Methods

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GetIterator()

Implementation of the contract to build a DocIdSetIterator.

Declaration
public override DocIdSetIterator GetIterator()
Returns
Type Description
DocIdSetIterator
Overrides
See Also
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Match(Int32)

Validation method to determine whether a docid should be in the result set.

Declaration
protected abstract bool Match(int docid)
Parameters
Type Name Description
System.Int32 docid

docid to be tested

Returns
Type Description
System.Boolean

true if input docid should be in the result set, false otherwise.

See Also