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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 IndexReader = Lucene.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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