Java Map Merge mergeCounterMap(Map map, String key, Object value)

Description

merge Counter Map

License

Apache License

Declaration

static void mergeCounterMap(Map map, String key, Object value) 

Method Source Code

//package com.java2s;
/*/*from w w w.j  a  v a  2s.c o  m*/
 * Copyright 2012 ReachLocal Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.util.*;

public class Main {
    static void mergeCounterMap(Map map, String key, Object value) {
        if (value instanceof Map) {
            mergeCounterMap(map, key, (Map) value);
        } else {
            mergeCounterMap(map, key, (Number) value);
        }
    }

    static void mergeCounterMap(Map<String, Map> map, String key, Map<String, Map> value) {
        Map item = map.get(key);
        if (item != null) {
            for (Map.Entry<String, Map> entry : value.entrySet()) {
                String k = entry.getKey();
                Object v = entry.getValue();
                mergeCounterMap(item, k, v);
            }
        } else {
            item = value;
        }
        map.put(key, item);
    }

    static void mergeCounterMap(Map<String, Number> map, String key, Number value) {
        Number total = map.get(key);
        if (total == null) {
            total = 0L;
        }
        map.put(key, total.longValue() + value.longValue());
    }
}

Related

1. mergeAggCompStatsTopoPageSpout(Map accSpoutStats, Map spoutStats)
2. mergeBootArgumentsIntoMap(String[] args, Map map)
3. mergeCompactedValue(Map obj, String key, Object value)
4. mergeCompositions( Map target, Map source)
5. mergeConfig(Map userConfig, Map referenceConfig)
6. mergeCountMaps(Map base, Map other)
7. mergeCounts(Map counter, String key)
8. mergeCustomProperties(Map copyTo, Map copyFrom)
9. mergeDefaults(Map content, Map defaults)