home | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Lucene example source code file (AbstractAllGroupsCollector.java)

This example Lucene source code file (AbstractAllGroupsCollector.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

abstractallgroupscollector, abstractallgroupscollector, collection, collection, collector, collector, io, ioexception, ioexception, util

The Lucene AbstractAllGroupsCollector.java source code

package org.apache.lucene.search.grouping;

 * 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,
 * See the License for the specific language governing permissions and
 * limitations under the License.

import org.apache.lucene.search.Collector;
import org.apache.lucene.search.Scorer;
import org.apache.lucene.util.BytesRef;

import java.io.IOException;
import java.util.Collection;

 * A collector that collects all groups that match the
 * query. Only the group value is collected, and the order
 * is undefined.  This collector does not determine
 * the most relevant document of a group.
 * <p/>
 * This is an abstract version. Concrete implementations define
 * what a group actually is and how it is internally collected.
 * @lucene.experimental
public abstract class AbstractAllGroupsCollector<GROUP_VALUE_TYPE> extends Collector {

   * Returns the total number of groups for the executed search.
   * This is a convenience method. The following code snippet has the same effect: <pre>getGroups().size()
* * @return The total number of groups for the executed search */ public int getGroupCount() { return getGroups().size(); } /** * Returns the group values * <p/> * This is an unordered collections of group values. For each group that matched the query there is a {@link BytesRef} * representing a group value. * * @return the group values */ public abstract Collection<GROUP_VALUE_TYPE> getGroups(); // Empty not necessary public void setScorer(Scorer scorer) throws IOException {} public boolean acceptsDocsOutOfOrder() { return true; } }

Other Lucene examples (source code examples)

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

my book on functional programming


new blog posts


Copyright 1998-2019 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.