add second constructor for easier usage

src/main/java/kieker/analysis/TraceAnalysisConfiguration.java

@@ -13,7 +13,6 @@ import kieker.analysis.domain.OperationCall;
 import kieker.analysis.domain.Trace;
 import kieker.analysis.graph.Graph;
 import kieker.analysis.graph.export.graphml.GraphMLFileWriterComposite;
-import kieker.analysis.graph.mapping.SimpleFileNameMapper;
 import kieker.analysis.stage.tracediagnosis.AllowedRecordsFilter;
 import kieker.analysis.stage.tracediagnosis.BeginEndOfMonitoringDetector;
 import kieker.analysis.stage.tracediagnosis.OperationCallHandlerComposite;
@@ -77,7 +76,7 @@ public class TraceAnalysisConfiguration extends Configuration {
 		TraceTraverserStage traceTraverserStage = new TraceTraverserStage();
 		final Distributor<Graph> graphDistributor = new Distributor<>(new CopyByReferenceStrategy());
 		// TODO create mapping object
-		GraphMLFileWriterComposite graphMLFileWriterComposite = new GraphMLFileWriterComposite(new SimpleFileNameMapper(graphFilesOutputDir, "xml"));
+		GraphMLFileWriterComposite graphMLFileWriterComposite = new GraphMLFileWriterComposite(graphFilesOutputDir);
 		DotGraphWriter dotGraphWriter = new DotGraphWriter(graphFilesOutputDir);
 
 		super.connectPorts(distributor.getNewOutputPort(), traceTraverserStage.getInputPort());
@@ -89,7 +88,7 @@ public class TraceAnalysisConfiguration extends Configuration {
 		AggrTraceTraverserStage aggrTraceTraverser = new AggrTraceTraverserStage();
 		final Distributor<Graph> graphDistributor2 = new Distributor<>(new CopyByReferenceStrategy());
 		// TODO create mapping object
-		GraphMLFileWriterComposite graphMLFileWriterComposite2 = new GraphMLFileWriterComposite(new SimpleFileNameMapper(graphFilesOutputDir, "xml"));
+		GraphMLFileWriterComposite graphMLFileWriterComposite2 = new GraphMLFileWriterComposite(graphFilesOutputDir);
 		// DotGraphWriter dotGraphWriter2 = new DotGraphWriter(graphFilesOutputDir);
 
 		super.connectPorts(aggregation.getOutputPort(), aggregatedTraceDistributor.getInputPort());

src/main/java/kieker/analysis/graph/export/graphml/GraphMLFileWriterComposite.java

@@ -6,6 +6,7 @@ import java.io.OutputStream;
 
 import kieker.analysis.graph.Graph;
 import kieker.analysis.graph.mapping.GraphMapper;
+import kieker.analysis.graph.mapping.SimpleFileNameMapper;
 
 public class GraphMLFileWriterComposite extends GraphMLWriterComposite {
 
@@ -22,4 +23,8 @@ public class GraphMLFileWriterComposite extends GraphMLWriterComposite {
 		});
 	}
 
+	public GraphMLFileWriterComposite(final String outputDirectory) {
+		this(new SimpleFileNameMapper(outputDirectory, "graphml"));
+	}
+
 }