a1a9a19324
This commit uses a custom atoi function that converts 12.4 to 124 so we can do integer math instead of using doubles.
110 lines
3.6 KiB
Java
110 lines
3.6 KiB
Java
/*
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* Copyright 2023 The original authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package dev.morling.onebrc;
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import static java.util.stream.Collectors.*;
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import java.io.IOException;
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import java.nio.file.Files;
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import java.nio.file.Paths;
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import java.util.Map;
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import java.util.TreeMap;
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import java.util.stream.Collector;
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public class CalculateAverage_fragmede {
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private static final String FILE = "./measurements.txt";
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// private static final String FILE = "./yaku.txt";// "./measurements.txt";
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private static record Measurement(String station, int value) {
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public static Measurement of(String[] parts) {
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//System.out.printf("string: %s!\n", parts[1]);
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boolean negative = false;
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int idx = 0;
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if (parts[1].charAt(0) == '-') {
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negative = true;
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idx = 1;
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}
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int digit = (parts[1].charAt(idx)-48) * 10;
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int digit2 = 0;
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if (parts[1].charAt(idx+1) != '.') {
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// two digit temperature
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digit = (digit) * 10;
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//System.out.println(parts[1].charAt(idx+1));
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digit2 = (parts[1].charAt(idx+1)-48)*10;
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idx++;
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}
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// if (parts[1].charAt(idx+2) != ".") {
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// abort();
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// }
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int frac = parts[1].charAt(idx+2)-48;
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//System.out.printf("parts, %d:%d:%d\n", digit, digit2, frac);
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int value = digit + digit2 + frac;
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if (negative) {
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value = -value;
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}
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//System.out.printf("end value: %d\n", value);
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return new Measurement(parts[0], value);
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}
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}
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private static record ResultRow(double min, double mean, double max) {
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public String toString() {
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return min + "/" + round(mean) + "/" + max;
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}
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private double round(double value) {
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return Math.round(value * 10.0) / 10.0;
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}
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};
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private static class MeasurementAggregator {
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private double min = Double.POSITIVE_INFINITY;
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private double max = Double.NEGATIVE_INFINITY;
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private double sum;
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private long count;
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}
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public static void main(String[] args) throws IOException {
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Collector<Measurement, MeasurementAggregator, ResultRow> collector = Collector.of(
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MeasurementAggregator::new,
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(a, m) -> {
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a.min = Math.min(a.min, m.value);
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a.max = Math.max(a.max, m.value);
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a.sum += m.value;
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a.count++;
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},
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(agg1, agg2) -> {
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var res = new MeasurementAggregator();
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res.min = Math.min(agg1.min, agg2.min);
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res.max = Math.max(agg1.max, agg2.max);
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res.sum = agg1.sum + agg2.sum;
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res.count = agg1.count + agg2.count;
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return res;
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},
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agg -> {
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return new ResultRow(agg.min / 10.0, agg.sum / 10.0 / agg.count, agg.max / 10.0);
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});
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Map<String, ResultRow> measurements = new TreeMap<>(Files.lines(Paths.get(args[0]))
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.map(l -> Measurement.of(l.split(";")))
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.collect(groupingBy(Measurement::station, collector)));
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System.out.println(measurements);
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}
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}
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