Java tutorial
/** * 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.lang3.mutable.MutableFloat; /** * Sum Accumulation for floats. * * @since 3.5.0 */ public class SumFloat implements Accumulation<Float, MutableFloat, Float> { @Override public MutableFloat defaultAccumulatedValue() { return new MutableFloat(0.); } @Override public MutableFloat accumulate(MutableFloat accumulatedValue, Float input) { accumulatedValue.add(input); return accumulatedValue; } @Override public MutableFloat merge(MutableFloat accumulatedValue1, MutableFloat accumulatedValue2) { accumulatedValue1.add(accumulatedValue2); return accumulatedValue1; } @Override public Float getOutput(MutableFloat accumulatedValue) { return accumulatedValue.floatValue(); } @Override public Float getRetraction(Float value) { return -value; } }