Abstract base class for restricting which documents may be returned during searching.

Note: In Lucene 3.0 {@link #Bits(IndexReader)} will be removed and {@link #GetDocIdSet(IndexReader)} will be defined as abstract. All implementing classes must therefore implement {@link #GetDocIdSet(IndexReader)} in order to work with Lucene 3.0.

[SerializableAttribute]
public abstract class Filter

<SerializableAttribute> _
Public MustInherit Class Filter

[SerializableAttribute]
public ref class Filter abstract