Filter


1   package org.apache.lucene.search;
2   
3   /**
4    * Copyright 2004 The Apache Software Foundation
5    *
6    * Licensed under the Apache License, Version 2.0 (the "License");
7    * you may not use this file except in compliance with the License.
8    * You may obtain a copy of the License at
9    *
10   *     http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  
19  import java.util.BitSet  ;
20  import java.io.IOException  ;
21  import org.apache.lucene.index.IndexReader;
22  
23  /** Abstract base class providing a mechanism to restrict searches to a subset
24   of an index. */
25  public abstract class Filter implements java.io.Serializable   {
26    /** Returns a BitSet with true for documents which should be permitted in
27      search results, and false for those that should not. */
28    public abstract BitSet   bits(IndexReader reader) throws IOException  ;
29  }
30

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