jstorm-core/src/main/java/com/alibaba/jstorm/common/metric/old/operator/merger/SumMerger.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */
package com.alibaba.jstorm.common.metric.old.operator.merger;

import java.util.Collection;

import com.alibaba.jstorm.utils.JStormUtils;

public class SumMerger<T extends Number> implements Merger<T> {
    private static final long serialVersionUID = -7026523452570138433L;

    @SuppressWarnings("unchecked")
    @Override
    public T merge(Collection<T> objs, T unflushed, Object... others) {
        // TODO Auto-generated method stub
        T ret = unflushed;
        for (T obj : objs) {
            ret = (T) JStormUtils.add(ret, obj);
        }

        return ret;
    }

}