Java Map Invert inverseGet(Map map, Object value)

Description

inverse Get

License

Open Source License

Declaration

public static <K, V> Collection<K> inverseGet(Map<K, V> map, Object value) 

Method Source Code

//package com.java2s;
/* /* w  ww.j a va2  s .  c  om*/
    
 Created on Mar 4, 2005
    
 The Bungee View applet lets you search, browse, and data-mine an image collection.  
 Copyright (C) 2006  Mark Derthick
    
 This program is free software; you can redistribute it and/or
 modify it under the terms of the GNU General Public License
 as published by the Free Software Foundation; either version 2
 of the License, or (at your option) any later version.  See gpl.html.
    
 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.
    
 You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
    
 You may also contact the author at 
 mad@cs.cmu.edu, 
 or at
 Mark Derthick
 Carnegie-Mellon University
 Human-Computer Interaction Institute
 Pittsburgh, PA 15213
    
 */

import java.util.Collection;

import java.util.Iterator;
import java.util.LinkedList;

import java.util.Map;

import java.util.Map.Entry;

public class Main {
    public static <K, V> Collection<K> inverseGet(Map<K, V> map, Object value) {
        Collection<K> result = new LinkedList<K>();
        for (Iterator<Entry<K, V>> it = map.entrySet().iterator(); it.hasNext();) {
            Entry<K, V> name = it.next();
            if (equalsNullOK(value, name.getValue())) {
                result.add(name.getKey());
            }
        }
        return result;
    }

    /**
     * @param arg1
     * @param arg2
     * @return Whether both args are null, or the args are equal
     */
    public static boolean equalsNullOK(Object arg1, Object arg2) {
        return arg1 == null ? arg2 == null : arg1.equals(arg2);
    }
}

Related

1. inverse(Map m, Map newMap)
2. inverse(Map map)
3. inverse(Map map)
4. invert(Map map)
5. invert(Map in)
6. invert(Map map)
7. invert(Map map, String prefix)