Class Filter

Creates a DocIdSet enumerating the documents that should be permitted in search results. NOTE: null can be returned if no documents are accepted by this Filter.

Note: this method will be called once per segment in the index during searching. The returned DocIdSet must refer to document IDs for that segment, not for the top-level reader.

Creates a new instance with the ability to specify the body of the GetDocIdSet(AtomicReaderContext, IBits) method through the getDocIdSet parameter. Simple example:

    var filter = Filter.NewAnonymous(getDocIdSet: (context, acceptDocs) =>
    {
        if (acceptDocs == null) acceptDocs = new Bits.MatchAllBits(5);
        OpenBitSet bitset = new OpenBitSet(5);
        if (acceptDocs.Get(1)) bitset.Set(1);
        if (acceptDocs.Get(3)) bitset.Set(3);
        return new DocIdBitSet(bitset);
    });

LUCENENET specific