Java Map Sort sortMapUsingComparator(final Map map, final Comparator comparator)

Description

Sort given map by keys, using specified comparator

License

Open Source License

Parameter

Parameter	Description
T	key type
V	value type
map	Map, which will be sorted
comparator	Comparator for comparing keys

Return

new instance of map, sorted by keys

Declaration

public static <T, V> Map<T, V> sortMapUsingComparator(final Map<T, V> map, final Comparator<T> comparator) 

Method Source Code

//package com.java2s;
/**/*from ww  w .j a v  a 2  s  .co  m*/
 * ***************************************************************************
 * Copyright (c) 2010 Qcadoo Limited
 * Project: Qcadoo Framework
 * Version: 1.2.0
 *
 * This file is part of Qcadoo.
 *
 * Qcadoo is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published
 * by the Free Software Foundation; either version 3 of the License,
 * or (at your option) any later version.
 *
 * 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 * ***************************************************************************
 */

import java.util.Collections;
import java.util.Comparator;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

public class Main {
    /**
     * Sort given map by keys, using specified comparator
     * 
     * @param <T>
     *            key type
     * @param <V>
     *            value type
     * @param map
     *            Map, which will be sorted
     * @param comparator
     *            Comparator for comparing keys
     * @return new instance of map, sorted by keys
     */
    public static <T, V> Map<T, V> sortMapUsingComparator(final Map<T, V> map, final Comparator<T> comparator) {
        List<T> operationList = new LinkedList<T>(map.keySet());

        Collections.sort(operationList, comparator);

        Map<T, V> result = new LinkedHashMap<T, V>();

        for (T key : operationList) {
            result.put(key, map.get(key));
        }
        return result;
    }
}

Related

1. sortMapByValuesDecreasing( final Map mapToSort)
2. sortMapByValuesDescending( Map aMap)
3. sortMapDesc(Map map)
4. sortMapDescByValue(Map map)
5. sortMapDescendingByValue(Map unsortedMap)
6. sortParams(Map params)
7. sortSimilarityMapByValue(SortedMap temp)
8. sortValue(Map toSort, boolean descending, final boolean thenByKey)
9. sortXLabels(Map xLabels)