001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.commons.functor.aggregator.functions; 018 019import org.apache.commons.functor.BinaryFunction; 020 021/** 022 * Aggregation function to be used with subclasses of 023 * {@link org.apache.commons.functor.aggregator.AbstractNoStoreAggregator} which 024 * finds the maximum of 2 double(s). 025 */ 026public final class DoubleMaxAggregatorBinaryFunction implements BinaryFunction<Double, Double, Double> { 027 /** 028 * Computes the maximum of the 2 given numbers and returns the result. 029 * 030 * @param left 031 * first number to compare. If <code>null</code>, then 032 * <code>right</code> will be returned. 033 * @param right 034 * second number to add. If <code>null</code>, then 035 * <code>left</code> will be returned. 036 * @return max of the 2 double's as described above 037 */ 038 public Double evaluate(Double left, Double right) { 039 if (left == null) { 040 return right; 041 } 042 if (right == null) { 043 return left; 044 } 045 if (left.doubleValue() < right.doubleValue()) { 046 return right; 047 } 048 return left; 049 } 050 051 @Override 052 public String toString() { 053 return DoubleMaxAggregatorBinaryFunction.class.getName(); 054 } 055}