合并以映射值。

/*******************************************************************************

 * Copyright (c) 2014-2-26 @author <a href="mailto:iffiff1@gmail.com">Tyler Chen</a>.

 * All rights reserved.

 *

 * Contributors:

 *     <a href="mailto:iffiff1@gmail.com">Tyler Chen</a> - initial API and implementation

 ******************************************************************************//* 来自 时代Java公众号 - N o w J a  v a . c o m*/

import java.util.ArrayList;

import java.util.LinkedHashMap;

import java.util.List;

import java.util.Map;

import java.util.Map.Entry;

import java.util.Set;


public class Main{

    /**

     * <pre>

     * combine to map values.

     * Usage:

     * Map map1 = toMap("aaa", 123, "bbb", 123);

     * Map map2 = toMap("aaaa", 123, "bbb", toMap("AAA", "123", "BBBB", toMap("@@@", "333")));

     * System.out.println(combine(map1, map2));

     * Result:

     * {aaa=123, bbb={AAA=123, BBBB={@@@=333}}, aaaa=123}

     * </pre>

     * @param beCombineMap

     * @param toCombineMap

     * @return

     * @author <a href="mailto:iffiff1@gmail.com">Tyler Chen</a> 

     * @since Aug 28, 2015

     */

    public static Map combine(Map beCombineMap, Map toCombineMap) {

        List<Map> p1 = new ArrayList<Map>(128);

        List<Map> p2 = new ArrayList<Map>(128);

        {

            p1.add(beCombineMap);

            p2.add(toCombineMap);

        }

        while (!p2.isEmpty()) {

            Map map1 = p1.remove(p1.size() - 1);

            Map map2 = p2.remove(p2.size() - 1);

            for (Entry entry : (Set<Entry>) map2.entrySet()) {// 来自 N o w J a v a . c o m - 时  代  Java

                if (entry.getValue() instanceof Map) {

                    Object object = map1.get(entry.getKey());

                    if (object == null) {

                        object = new LinkedHashMap();

                        map1.put(entry.getKey(), object);

                        {

                            p1.add((Map) object);

                            p2.add((Map) entry.getValue());

                        }

                    } else if (!(object instanceof Map)) {

                        Logger.warn(FCS

                                .get("[MapHelper.combine][ISNOTMAP][{0}][Result will be overwrite]",

                                        entry.getKey()));