| package org.apache.lucene.search; |
| |
| /** |
| * 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. |
| */ |
| |
| import java.util.BitSet; |
| import java.io.IOException; |
| import org.apache.lucene.index.IndexReader; |
| |
| /** Abstract base class providing a mechanism to restrict searches to a subset |
| of an index. */ |
| public abstract class Filter implements java.io.Serializable { |
| /** Returns a BitSet with true for documents which should be permitted in |
| search results, and false for those that should not. */ |
| public abstract BitSet bits(IndexReader reader) throws IOException; |
| } |