Java Map Put putMultiple(Map map, Object key, Object value)

Description

put Multiple

License

Open Source License

Declaration

public static Map<Object, Object> putMultiple(Map<Object, Object> map, Object key, Object value) 

Method Source Code

//package com.java2s;
/*// w ww. jav a2  s.c om
 * Copyright 2012 The Solmix Project
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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
 * Lesser General Public License for more details.
 *
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.gnu.org/licenses/ 
 * or see the FSF site: http://www.fsf.org. 
 */

import java.util.ArrayList;

import java.util.List;
import java.util.Map;

public class Main {

    public static Map<Object, Object> putMultiple(Map<Object, Object> map, Object key, Object value) {
        Object existingValue = map.get(key);
        if (existingValue == null)
            map.put(key, value);
        else if (existingValue instanceof List)
            ((List) existingValue).add(value);
        else
            map.put(key, buildList(existingValue, value));
        return map;
    }

    /**
     * @param lists
     * @return
     */
    public static List<Object> buildList(List<Object>... lists) {
        List<Object> result = new ArrayList<Object>();
        for (List<Object> list : lists) {
            result.add(list);
        }
        return result;
    }

    /**
     * Build array object into List
     * 
     * @param lists
     * @return
     */
    public static List<Object> buildList(Object... lists) {
        List<Object> result = new ArrayList<Object>();
        for (Object list : lists) {
            result.add(list);
        }
        return result;
    }
}

Related

1. putMapEntry(Map map, String name, String value)
2. putMapNotNullKey(Map map, K key, V value)
3. putMapValue(String path, Object value, Map map)
4. putModifiedAttribute(Map aMap, String name, Object value)
5. putMultiEntry(Map map, Iterable keys, V value)
6. putNotDup(Map tbl, String key, String value)
7. putObject(Map map, V key, W value)
8. putObjectsInMultiMap(Map>> multiMap, Integer key, List stringPair)
9. putOrCreateList(Map> map, K key, V value)