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

Lucene example source code file (MapOfSets.java)

This example Lucene source code file (MapOfSets.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

collection, hashset, map, map, mapofsets, mapofsets, set, set, util, v, v

The Lucene MapOfSets.java source code

package org.apache.lucene.util;

/**
 * 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.util.Set;
import java.util.Collection;
import java.util.HashSet;
import java.util.Map;

/**
 * Helper class for keeping Lists of Objects associated with keys. <b>WARNING: THIS CLASS IS NOT THREAD SAFE
 * @lucene.internal
 */
public class MapOfSets<K, V> {

  private final Map<K, Set theMap;

  /**
   * @param m the backing store for this object
   */
  public MapOfSets(Map<K, Set m) {
    theMap = m;
  }

  /**
   * @return direct access to the map backing this object.
   */
  public Map<K, Set getMap() {
    return theMap;
  }

  /**
   * Adds val to the Set associated with key in the Map.  If key is not 
   * already in the map, a new Set will first be created.
   * @return the size of the Set associated with key once val is added to it.
   */
  public int put(K key, V val) {
    final Set<V> theSet;
    if (theMap.containsKey(key)) {
      theSet = theMap.get(key);
    } else {
      theSet = new HashSet<V>(23);
      theMap.put(key, theSet);
    }
    theSet.add(val);
    return theSet.size();
  }
   /**
   * Adds multiple vals to the Set associated with key in the Map.  
   * If key is not 
   * already in the map, a new Set will first be created.
   * @return the size of the Set associated with key once val is added to it.
   */
  public int putAll(K key, Collection<? extends V> vals) {
    final Set<V> theSet;
    if (theMap.containsKey(key)) {
      theSet = theMap.get(key);
    } else {
      theSet = new HashSet<V>(23);
      theMap.put(key, theSet);
    }
    theSet.addAll(vals);
    return theSet.size();
  }
 
}

Other Lucene examples (source code examples)

Here is a short list of links related to this Lucene MapOfSets.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.