Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * This software is in the public domain under CC0 1.0 Universal plus a
 * Grant of Patent License.
 *
 * To the extent possible under law, the author(s) have dedicated all
 * copyright and related and neighboring rights to this software to the
 * public domain worldwide. This software is distributed without any
 * warranty.
 *
 * You should have received a copy of the CC0 Public Domain Dedication
 * along with this software (see the LICENSE.md file). If not, see
 * <http://creativecommons.org/publicdomain/zero/1.0/>.
 */

import java.util.*;

public class Main {
    /** Creates a single Map with fields from the passed in Map and all nested Maps (for Map and Collection of Map entry values) */
    @SuppressWarnings("unchecked")
    public static Map flattenNestedMap(Map theMap) {
        if (theMap == null)
            return null;
        Map outMap = new LinkedHashMap();
        for (Object entryObj : theMap.entrySet()) {
            Map.Entry entry = (Map.Entry) entryObj;
            Object value = entry.getValue();
            if (value instanceof Map) {
                outMap.putAll(flattenNestedMap((Map) value));
            } else if (value instanceof Collection) {
                for (Object colValue : (Collection) value) {
                    if (colValue instanceof Map)
                        outMap.putAll(flattenNestedMap((Map) colValue));
                }
            } else {
                outMap.put(entry.getKey(), entry.getValue());
            }
        }
        return outMap;
    }
}