mirror of
https://github.com/tiennm99/java-design-patterns.git
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Ilkka Seppälä
0ca162a55c
* remove spring dep move junit, logging, mockito under dep mgmt * upgrade anti-corruption-layer deps * async method invocation * balking, bloc * bridge to bytecode * caching * callback - cqrs * component - health check * hexagonal - metadata mapping * rest of the patterns * remove checkstyle, take spotless into use
57 lines
2.4 KiB
Java
57 lines
2.4 KiB
Java
/*
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* This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
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*
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* The MIT License
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* Copyright © 2014-2022 Ilkka Seppälä
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package com.iluwatar;
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import java.util.ArrayList;
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import java.util.Comparator;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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/** The Reducer class is responsible for aggregating word counts from the shuffled data. */
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public class Reducer {
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private Reducer() {
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throw new UnsupportedOperationException(
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"Reducer is a utility class and cannot be instantiated.");
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}
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/**
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* Sums the occurrences of each word and sorts the results in descending order.
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*
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* @param grouped A map where keys are words and values are lists of their occurrences.
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* @return A sorted list of word counts in descending order.
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*/
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public static List<Map.Entry<String, Integer>> reduce(Map<String, List<Integer>> grouped) {
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Map<String, Integer> reduced = new HashMap<>();
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for (Map.Entry<String, List<Integer>> entry : grouped.entrySet()) {
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reduced.put(entry.getKey(), entry.getValue().stream().mapToInt(Integer::intValue).sum());
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}
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List<Map.Entry<String, Integer>> result = new ArrayList<>(reduced.entrySet());
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result.sort(Map.Entry.comparingByValue(Comparator.reverseOrder()));
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return result;
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}
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}
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