Added source from CSV files

pom.xml

@@ -4,7 +4,7 @@
 	<modelVersion>4.0.0</modelVersion>
 	<groupId>beamline</groupId>
 	<artifactId>framework</artifactId>
-	<version>0.0.2</version>
+	<version>0.0.3</version>
 
 	<properties>
 		<maven.compiler.source>11</maven.compiler.source>
@@ -59,5 +59,10 @@
 			<artifactId>graphviz</artifactId>
 			<version>0.0.2</version>
 		</dependency>
+		<dependency>
+			<groupId>com.opencsv</groupId>
+			<artifactId>opencsv</artifactId>
+			<version>5.6</version>
+		</dependency>
 	</dependencies>
 </project>
\ No newline at end of file

src/main/java/beamline/sources/CSVLogSource.java

+package beamline.sources;
+
+import java.io.IOException;
+import java.io.Reader;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+
+import org.deckfour.xes.extension.std.XConceptExtension;
+import org.deckfour.xes.factory.XFactory;
+import org.deckfour.xes.factory.XFactoryNaiveImpl;
+import org.deckfour.xes.model.XEvent;
+import org.deckfour.xes.model.XTrace;
+
+import com.opencsv.CSVParser;
+import com.opencsv.CSVReader;
+import com.opencsv.CSVReaderBuilder;
+
+import io.reactivex.rxjava3.annotations.NonNull;
+import io.reactivex.rxjava3.core.Observable;
+import io.reactivex.rxjava3.core.ObservableEmitter;
+import io.reactivex.rxjava3.core.ObservableOnSubscribe;
+
+public class CSVLogSource implements XesSource {
+
+	private static XFactory xesFactory = new XFactoryNaiveImpl();
+	private CSVReader csvReader;
+	private String filename;
+	private int caseIdColumn;
+	private int activityNameColumn;
+	private CSVParser parser;
+	
+	public CSVLogSource(String filename, int caseIdColumn, int activityNameColumn, CSVParser parser) throws IOException {
+		this.filename = filename;
+		this.caseIdColumn = caseIdColumn;
+		this.activityNameColumn = activityNameColumn;
+		this.parser = parser;
+	}
+	
+	public CSVLogSource(String filename, int caseIdColumn, int activityNameColumn) throws IOException {
+		this(filename, caseIdColumn, activityNameColumn, null);
+	}
+
+	@Override
+	public Observable<XTrace> getObservable() {
+		return Observable.create(new ObservableOnSubscribe<XTrace>() {
+			@Override
+			public void subscribe(@NonNull ObservableEmitter<@NonNull XTrace> emitter) throws Throwable {
+				String[] line;
+				while ((line = csvReader.readNext()) != null) {
+					XTrace eventWrapper = xesFactory.createTrace();
+					XEvent newEvent = xesFactory.createEvent();
+					XConceptExtension.instance().assignName(eventWrapper, line[caseIdColumn]);
+					XConceptExtension.instance().assignName(newEvent, line[activityNameColumn]);
+					for (int i = 0; i < line.length; i++) {
+						String attributeName = "attribute_" + i;
+						newEvent.getAttributes().put(attributeName, xesFactory.createAttributeLiteral(attributeName, line[i], null));
+					}
+					eventWrapper.add(newEvent);
+					emitter.onNext(eventWrapper);
+				}
+			}
+		});
+	}
+
+	@Override
+	public void prepare() throws Exception {
+		Reader reader = Files.newBufferedReader(Paths.get(filename));
+		if (parser == null) {
+			csvReader = new CSVReader(reader);
+		} else {
+			csvReader = new CSVReaderBuilder(reader).withCSVParser(parser).build();
+		}
+	}
+
+}

src/main/java/beamline/sources/XesLogSource.java

@@ -25,7 +25,7 @@ import io.reactivex.rxjava3.core.ObservableOnSubscribe;
 
 public class XesLogSource implements XesSource {
 
-private static XFactory xesFactory = new XFactoryNaiveImpl();
+	private static XFactory xesFactory = new XFactoryNaiveImpl();
 	
 	private String fileName;
 	private XLog log;