remove childGraph for vertices

src/main/java/kieker/analysis/graph/Vertex.java

@@ -8,6 +8,8 @@ public interface Vertex extends Element {
 
 	public Graph getChildGraph();
 
+	public void removeChildGraph();
+
 	public Iterable<Edge> getEdges(Direction direction);
 
 	public Iterable<Vertex> getVertices(Direction direction);

src/main/java/kieker/analysis/graph/impl/VertexImpl.java

@@ -35,6 +35,11 @@ class VertexImpl extends ElementImpl implements Vertex {
 		return childGraph;
 	}
 
+	@Override
+	public void removeChildGraph() {
+		childGraph = null;
+	}
+
 	@Override
 	public Iterable<Edge> getEdges(final Direction direction) {
 		if (direction.equals(Direction.OUT)) {