| /** |
| * 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 org.apache.apex.malhar.lib.window.accumulation; |
| |
| import org.apache.apex.malhar.lib.window.Accumulation; |
| import org.apache.commons.lang.mutable.MutableInt; |
| |
| /** |
| * Sum accumulation for integers. |
| * |
| * @since 3.5.0 |
| */ |
| public class SumInt implements Accumulation<Integer, MutableInt, Integer> |
| { |
| @Override |
| public MutableInt defaultAccumulatedValue() |
| { |
| return new MutableInt(0); |
| } |
| |
| @Override |
| public MutableInt accumulate(MutableInt accumulatedValue, Integer input) |
| { |
| accumulatedValue.add(input); |
| return accumulatedValue; |
| } |
| |
| @Override |
| public MutableInt merge(MutableInt accumulatedValue1, MutableInt accumulatedValue2) |
| { |
| accumulatedValue1.add(accumulatedValue2); |
| return accumulatedValue1; |
| } |
| |
| @Override |
| public Integer getOutput(MutableInt accumulatedValue) |
| { |
| return accumulatedValue.intValue(); |
| } |
| |
| @Override |
| public Integer getRetraction(Integer value) |
| { |
| return -value; |
| } |
| } |