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Lucene example source code file (Filter.java)

This example Lucene source code file (Filter.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Lucene tags/keywords

docidset, docidset, filter, filter, io, ioexception, ioexception

The Lucene Filter.java source code

package org.apache.lucene.search;

/**
 * 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.
 */

import java.io.IOException;

import org.apache.lucene.index.IndexReader;
import org.apache.lucene.util.DocIdBitSet;

/** 
 *  Abstract base class for restricting which documents may
 *  be returned during searching.
 */
public abstract class Filter implements java.io.Serializable {
  
  /**
   * Creates a {@link DocIdSet} enumerating the documents that should be
   * permitted in search results. <b>NOTE: null can be
   * returned if no documents are accepted by this Filter.
   * <p>
   * Note: This method will be called once per segment in
   * the index during searching.  The returned {@link DocIdSet}
   * must refer to document IDs for that segment, not for
   * the top-level reader.
   * 
   * @param reader a {@link IndexReader} instance opened on the index currently
   *         searched on. Note, it is likely that the provided reader does not
   *         represent the whole underlying index i.e. if the index has more than
   *         one segment the given reader only represents a single segment.
   *          
   * @return a DocIdSet that provides the documents which should be permitted or
   *         prohibited in search results. <b>NOTE: null can be returned if
   *         no documents will be accepted by this Filter.
   * 
   * @see DocIdBitSet
   */
  public abstract DocIdSet getDocIdSet(IndexReader reader) throws IOException;
}

Other Lucene examples (source code examples)

Here is a short list of links related to this Lucene Filter.java source code file:



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