/*
* Copyright 2004 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
using System;
using IndexReaderLucene.Net.Index.IndexReader;
namespace Lucene.Net.Search{
/// <summary>Abstract base class providing a mechanism to restrict searches to a subset
/// of an index.
/// </summary>
[Serializable]
public abstract class Filter
{
/// <summary>Returns a BitSet with true for documents which should be permitted in
/// search results, and false for those that should not.
/// </summary>
public abstract System.Collections.BitArray Bits(IndexReader reader);
}
}
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