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/*
* Copyright 2023 The original authors
*
* Licensed 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 dev.morling.onebrc;
import static java.util.stream.Collectors.averagingDouble;
import static java.util.stream.Collectors.groupingBy;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Map;
import java.util.TreeMap;
import java.util.stream.Collectors;
public class CalculateAverage {
private static final String FILE = "./measurements.txt";
public static void main(String[] args) throws IOException {
Map<String, Double> measurements = Files.lines(Paths.get(FILE))
.map(l -> l.split(";"))
.collect(groupingBy(m -> m[0], averagingDouble(m -> Double.parseDouble(m[1]))));
measurements = new TreeMap<>(measurements.entrySet()
.stream()
.collect(Collectors.toMap(e -> e.getKey(), e -> Math.round(e.getValue() * 10.0) / 10.0)));
System.out.println(measurements);
}
}
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