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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.*;
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.Collector;
public class CalculateAverage_fragmede {
private static final String FILE = "./measurements.txt";
// private static final String FILE = "./yaku.txt";// "./measurements.txt";
private static record Measurement(String station, int value) {
public static Measurement of(String[] parts) {
//System.out.printf("string: %s!\n", parts[1]);
boolean negative = false;
int idx = 0;
if (parts[1].charAt(0) == '-') {
negative = true;
idx = 1;
}
int digit = (parts[1].charAt(idx)-48) * 10;
int digit2 = 0;
if (parts[1].charAt(idx+1) != '.') {
// two digit temperature
digit = (digit) * 10;
//System.out.println(parts[1].charAt(idx+1));
digit2 = (parts[1].charAt(idx+1)-48)*10;
idx++;
}
// if (parts[1].charAt(idx+2) != ".") {
// abort();
// }
int frac = parts[1].charAt(idx+2)-48;
//System.out.printf("parts, %d:%d:%d\n", digit, digit2, frac);
int value = digit + digit2 + frac;
if (negative) {
value = -value;
}
//System.out.printf("end value: %d\n", value);
return new Measurement(parts[0], value);
}
}
private static record ResultRow(double min, double mean, double max) {
public String toString() {
return min + "/" + round(mean) + "/" + max;
}
private double round(double value) {
return Math.round(value * 10.0) / 10.0;
}
};
private static class MeasurementAggregator {
private double min = Double.POSITIVE_INFINITY;
private double max = Double.NEGATIVE_INFINITY;
private double sum;
private long count;
}
public static void main(String[] args) throws IOException {
Collector<Measurement, MeasurementAggregator, ResultRow> collector = Collector.of(
MeasurementAggregator::new,
(a, m) -> {
a.min = Math.min(a.min, m.value);
a.max = Math.max(a.max, m.value);
a.sum += m.value;
a.count++;
},
(agg1, agg2) -> {
var res = new MeasurementAggregator();
res.min = Math.min(agg1.min, agg2.min);
res.max = Math.max(agg1.max, agg2.max);
res.sum = agg1.sum + agg2.sum;
res.count = agg1.count + agg2.count;
return res;
},
agg -> {
return new ResultRow(agg.min / 10.0, agg.sum / 10.0 / agg.count, agg.max / 10.0);
});
Map<String, ResultRow> measurements = new TreeMap<>(Files.lines(Paths.get(args[0]))
.map(l -> Measurement.of(l.split(";")))
.collect(groupingBy(Measurement::station, collector)));
System.out.println(measurements);
}
}
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