| /** |
| * 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 |
| * <p> |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * <p> |
| * 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.storm.trident.operation.builtin; |
| |
| import java.util.Comparator; |
| |
| /** |
| * This aggregator computes the maximum of aggregated tuples in a stream. It uses given {@code comparator} for comparing two values in a |
| * stream. |
| */ |
| public class MaxWithComparator<T> extends ComparisonAggregator<T> { |
| private final Comparator<T> comparator; |
| |
| public MaxWithComparator(Comparator<T> comparator) { |
| this(null, comparator); |
| } |
| |
| public MaxWithComparator(String inputFieldName, Comparator<T> comparator) { |
| super(inputFieldName); |
| this.comparator = comparator; |
| } |
| |
| @Override |
| protected T compare(T value1, T value2) { |
| return comparator.compare(value1, value2) > 0 ? value1 : value2; |
| } |
| |
| @Override |
| public String toString() { |
| return "MaxWithComparator{" + |
| "comparator=" + comparator + |
| '}'; |
| } |
| } |