feat: File processing.
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f0b7096865
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9 changed files with 162 additions and 0 deletions
13
src/main/java/eu/ztsh/lfr/model/Averages.java
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13
src/main/java/eu/ztsh/lfr/model/Averages.java
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package eu.ztsh.lfr.model;
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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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public class Averages extends HashMap<String, List<Average>> {
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public Averages(Map<String, List<Average>> m) {
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super(m);
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}
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}
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5
src/main/java/eu/ztsh/lfr/model/DataRow.java
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5
src/main/java/eu/ztsh/lfr/model/DataRow.java
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package eu.ztsh.lfr.model;
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public record DataRow(String city, int year, double temperature) {
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}
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package eu.ztsh.lfr.model;
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public class FileProcessingException extends RuntimeException {
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public FileProcessingException(String message, Throwable cause) {
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super(message, cause);
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}
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}
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33
src/main/java/eu/ztsh/lfr/model/Temperatures.java
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src/main/java/eu/ztsh/lfr/model/Temperatures.java
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package eu.ztsh.lfr.model;
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import java.util.Map;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.ConcurrentMap;
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import java.util.stream.Collectors;
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public class Temperatures extends ConcurrentHashMap<String, ConcurrentMap<Integer, YearDataAccumulator>> {
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public void addData(DataRow dataRow) {
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putIfAbsent(dataRow.city(), new ConcurrentHashMap<>());
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var city = get(dataRow.city());
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city.putIfAbsent(dataRow.year(), new YearDataAccumulator());
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city.get(dataRow.year()).add(dataRow.temperature());
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}
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public Averages getAverages() {
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var computed = entrySet().stream()
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.map(entry -> {
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var newEntry = entry.getValue().entrySet().stream()
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.map(yearEntry -> {
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var average = new Average();
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average.setYear(yearEntry.getKey().toString());
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average.setAverageTemperature(yearEntry.getValue().getAverage());
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return average;
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})
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.toList();
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return Map.entry(entry.getKey(), newEntry);
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}).collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
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return new Averages(computed);
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}
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}
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25
src/main/java/eu/ztsh/lfr/model/YearDataAccumulator.java
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src/main/java/eu/ztsh/lfr/model/YearDataAccumulator.java
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package eu.ztsh.lfr.model;
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import java.math.BigDecimal;
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import java.math.RoundingMode;
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import java.util.concurrent.atomic.AtomicInteger;
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import java.util.concurrent.atomic.DoubleAdder;
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public class YearDataAccumulator {
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private final DoubleAdder sum = new DoubleAdder();
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private final AtomicInteger counter = new AtomicInteger();
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public void add(double value) {
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synchronized (this) {
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sum.add(value);
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counter.incrementAndGet();
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}
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}
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public BigDecimal getAverage() {
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return BigDecimal.valueOf(sum.sum()).setScale(2, RoundingMode.HALF_UP)
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.divide(BigDecimal.valueOf(counter.get()), RoundingMode.HALF_UP);
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}
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}
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package eu.ztsh.lfr.model.events;
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import eu.ztsh.lfr.model.Averages;
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public record FileProcessedEvent(Averages averages) {
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}
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