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CsvTimeSeriesSource.java
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CsvTimeSeriesSource.java
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/*
* © 2021. TU Dortmund University,
* Institute of Energy Systems, Energy Efficiency and Energy Economics,
* Research group Distribution grid planning and operation
*/
package edu.ie3.datamodel.io.source.csv;
import edu.ie3.datamodel.exceptions.SourceException;
import edu.ie3.datamodel.io.csv.CsvIndividualTimeSeriesMetaInformation;
import edu.ie3.datamodel.io.factory.timeseries.*;
import edu.ie3.datamodel.io.naming.FileNamingStrategy;
import edu.ie3.datamodel.io.source.TimeSeriesSource;
import edu.ie3.datamodel.models.timeseries.individual.IndividualTimeSeries;
import edu.ie3.datamodel.models.timeseries.individual.TimeBasedValue;
import edu.ie3.datamodel.models.value.*;
import edu.ie3.datamodel.utils.TimeSeriesUtils;
import edu.ie3.util.interval.ClosedInterval;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.time.ZonedDateTime;
import java.util.*;
import java.util.function.Function;
import java.util.stream.Collectors;
/** Source that is capable of providing information around time series from csv files. */
public class CsvTimeSeriesSource<V extends Value> extends TimeSeriesSource<V> {
private final IndividualTimeSeries<V> timeSeries;
private final CsvDataSource dataSource;
/**
* Factory method to build a source from given meta information
*
* @param csvSep the separator string for csv columns
* @param folderPath path to the folder holding the time series files
* @param fileNamingStrategy strategy for the file naming of time series files / data sinks
* @param metaInformation The given meta information
* @throws SourceException If the given meta information are not supported
* @return The source
*/
public static CsvTimeSeriesSource<? extends Value> getSource(
String csvSep,
String folderPath,
FileNamingStrategy fileNamingStrategy,
CsvIndividualTimeSeriesMetaInformation metaInformation)
throws SourceException {
if (!TimeSeriesUtils.isSchemeAccepted(metaInformation.getColumnScheme()))
throw new SourceException(
"Unsupported column scheme '" + metaInformation.getColumnScheme() + "'.");
Class<? extends Value> valClass = metaInformation.getColumnScheme().getValueClass();
return create(csvSep, folderPath, fileNamingStrategy, metaInformation, valClass);
}
private static <T extends Value> CsvTimeSeriesSource<T> create(
String csvSep,
String folderPath,
FileNamingStrategy fileNamingStrategy,
CsvIndividualTimeSeriesMetaInformation metaInformation,
Class<T> valClass) {
TimeBasedSimpleValueFactory<T> valueFactory = new TimeBasedSimpleValueFactory<>(valClass);
return new CsvTimeSeriesSource<>(
csvSep,
folderPath,
fileNamingStrategy,
metaInformation.getUuid(),
metaInformation.getFullFilePath(),
valClass,
valueFactory);
}
public CsvTimeSeriesSource(
String csvSep,
String folderPath,
FileNamingStrategy fileNamingStrategy,
UUID timeSeriesUuid,
String filePath,
Class<V> valueClass,
TimeBasedSimpleValueFactory<V> factory) {
this.dataSource = new CsvDataSource(csvSep, folderPath, fileNamingStrategy);
/* Read in the full time series */
try {
this.timeSeries =
buildIndividualTimeSeries(
timeSeriesUuid,
filePath,
fieldToValue -> this.buildTimeBasedValue(fieldToValue, valueClass, factory));
} catch (SourceException e) {
throw new IllegalArgumentException(
"Unable to obtain time series with UUID '"
+ timeSeriesUuid
+ "'. Please check arguments!",
e);
}
}
@Override
public IndividualTimeSeries<V> getTimeSeries() {
return timeSeries;
}
@Override
public IndividualTimeSeries<V> getTimeSeries(ClosedInterval<ZonedDateTime> timeInterval) {
return TimeSeriesUtils.trimTimeSeriesToInterval(timeSeries, timeInterval);
}
@Override
public Optional<V> getValue(ZonedDateTime time) {
return timeSeries.getValue(time);
}
/**
* Attempts to read a time series with given unique identifier and file path. Single entries are
* obtained entries with the help of {@code fieldToValueFunction}.
*
* @param timeSeriesUuid unique identifier of the time series
* @param filePath path to the file to read
* @param fieldToValueFunction function, that is able to transfer a mapping (from field to value)
* onto a specific instance of the targeted entry class
* @throws SourceException If the file cannot be read properly
* @return An option onto an individual time series
*/
private IndividualTimeSeries<V> buildIndividualTimeSeries(
UUID timeSeriesUuid,
String filePath,
Function<Map<String, String>, Optional<TimeBasedValue<V>>> fieldToValueFunction)
throws SourceException {
try (BufferedReader reader = dataSource.connector.initReader(filePath)) {
Set<TimeBasedValue<V>> timeBasedValues =
dataSource
.buildStreamWithFieldsToAttributesMap(TimeBasedValue.class, reader)
.map(fieldToValueFunction)
.flatMap(Optional::stream)
.collect(Collectors.toSet());
return new IndividualTimeSeries<>(timeSeriesUuid, timeBasedValues);
} catch (FileNotFoundException e) {
throw new SourceException("Unable to find a file with path '" + filePath + "'.", e);
} catch (IOException e) {
throw new SourceException("Error during reading of file'" + filePath + "'.", e);
}
}
}