Update.

src/main/org/insa/graph/Graph.java

@@ -10,6 +10,10 @@ public class Graph {
 	// Nodes of the graph.
 	private ArrayList<Node> nodes;
 
+	/**
+	 * @param mapId
+	 * @param nodes
+	 */
 	public Graph(int mapId, ArrayList<Node> nodes) {
 		this.mapId = mapId;
 		this.nodes = nodes;
@@ -24,5 +28,13 @@ public class Graph {
 	 * @return Map ID of this graph.
 	 */
 	public int getMapId() { return mapId; }
+	
+	/**
+	 * @return Return the transpose graph of this graph.
+	 */
+	public Graph transpose() {
+		// TODO: 
+		return null;
+	}
 
 }