Java Map Merge deepMerge(Map dst, Map src)

Description

Deep merges two maps

License

Open Source License

Parameter

Parameter	Description
dst	the map where elements will be merged into
src	the map with the elements to merge

Return

a deep merge of the two given maps.

Declaration

@SuppressWarnings("unchecked")
public static Map deepMerge(Map dst, Map src) 

Method Source Code

//package com.java2s;
/*/*from  ww  w  .  j  a  v  a2  s .c  o m*/
 * Copyright (C) 2007-${year} Crafter Software Corporation.
 *
 *   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 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 General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

import java.util.Map;

public class Main {
    /**
     * Deep merges two maps
     *
     * @param dst the map where elements will be merged into
     * @param src the map with the elements to merge
     * @return a deep merge of the two given maps.
     */
    @SuppressWarnings("unchecked")
    public static Map deepMerge(Map dst, Map src) {
        if (dst != null && src != null) {
            for (Object key : src.keySet()) {
                if (src.get(key) instanceof Map && dst.get(key) instanceof Map) {
                    Map originalChild = (Map) dst.get(key);
                    Map newChild = (Map) src.get(key);
                    dst.put(key, deepMerge(originalChild, newChild));
                } else {
                    dst.put(key, src.get(key));
                }
            }
        }

        return dst;
    }
}

Related

1. deepMerge(Map m1, Map m2)
2. deepMerge(Map original, Map newMap)
3. merge(final Map lhs, final Map rhs)
4. merge(final Map map1, final Map map2)