Implemented step 2

Now createFastestPath and createShortestPath are created. Step 2
finished

be-graphes-model/src/main/java/org/insa/graphs/model/Path.java

@@ -30,12 +30,49 @@ public class Path {
 	 * @throws IllegalArgumentException If the list of nodes is not valid, i.e. two
 	 *         consecutive nodes in the list are not connected in the graph.
 	 *
-     * @deprecated Need to be implemented.
 	 */
 	public static Path createFastestPathFromNodes(Graph graph, List<Node> nodes)
 			throws IllegalArgumentException {
-        List<Arc> arcs = new ArrayList<Arc>();
-        // TODO:
+		int nodeListSize = nodes.size();
+
+		List<Arc> arcs = new ArrayList<Arc>(nodeListSize);
+
+		if(nodeListSize > 1) {
+			//nodes.size() - 1 because we look at i and i+1
+			for(int i=0;i<nodes.size() - 1;i++) {
+
+				//for each node we try to find fastestPath between i and i+1
+				List<Arc> neighbourhood = nodes.get(i).getSuccessors();
+
+				Arc fastestPath = null;
+
+				for(Arc nextArc : neighbourhood) {
+					if(nextArc.getDestination().compareTo(nodes.get(i+1)) == 0) {
+						//here we find a path between i and i+1, now we need to see if it's the fastest one
+						if(fastestPath == null) {
+							fastestPath = nextArc;
+						}
+						else if(fastestPath.getMinimumTravelTime() > nextArc.getMinimumTravelTime()) {
+							fastestPath = nextArc;
+						}
+					}
+				}
+
+				if(fastestPath == null) {
+					throw new IllegalArgumentException();
+				}
+
+				arcs.add(fastestPath);       	
+			}
+		}
+		else if (nodeListSize == 1) {
+			return new Path(graph, nodes.get(0));
+		}
+		else {
+			//nodeListSize == 0
+			return new Path(graph);
+		}        
+
 		return new Path(graph, arcs);
 	}
 
@@ -51,12 +88,51 @@ public class Path {
 	 * @throws IllegalArgumentException If the list of nodes is not valid, i.e. two
 	 *         consecutive nodes in the list are not connected in the graph.
 	 * 
-     * @deprecated Need to be implemented.
+	 * 
 	 */
 	public static Path createShortestPathFromNodes(Graph graph, List<Node> nodes)
 			throws IllegalArgumentException {
-        List<Arc> arcs = new ArrayList<Arc>();
-        // TODO:
+
+		int nodeListSize = nodes.size();
+
+		List<Arc> arcs = new ArrayList<Arc>(nodeListSize);
+
+		if(nodeListSize > 1) {
+			//nodes.size() - 1 because we look at i and i+1
+			for(int i=0;i<nodes.size() - 1;i++) {
+
+				//for each node we try to find shortestPath between i and i+1
+				List<Arc> neighbourhood = nodes.get(i).getSuccessors();
+
+				Arc shortestPath = null;
+
+				for(Arc nextArc : neighbourhood) {
+					if(nextArc.getDestination().compareTo(nodes.get(i+1)) == 0) {
+						//here we find a path between i and i+1, now we need to see if it's the shortest one
+						if(shortestPath == null) {
+							shortestPath = nextArc;
+						}
+						else if(shortestPath.getLength() > nextArc.getLength()) {
+							shortestPath = nextArc;
+						}
+					}
+				}
+
+				if(shortestPath == null) {
+					throw new IllegalArgumentException();
+				}
+
+				arcs.add(shortestPath);       	
+			}
+		}
+		else if (nodeListSize == 1) {
+			return new Path(graph, nodes.get(0));
+		}
+		else {
+			//nodeListSize == 0
+			return new Path(graph);
+		}        
+
 		return new Path(graph, arcs);
 	}
 
@@ -198,23 +274,44 @@ public class Path {
 	 * 
 	 * @return true if the path is valid, false otherwise.
 	 * 
-     * @deprecated Need to be implemented.
 	 */
 	public boolean isValid() {
-        // TODO:
+
+		if((this.isEmpty() && arcs.isEmpty()) || this.size() == 1) {
+			return true;
+		}
+
+		//the first arc has for origin the origin of the path
+		if(this.arcs.get(0).getOrigin() != this.origin) {
 			return false;
 		}
 
+		//for two consecutive arcs, the destination of the first one is the origin of the second one
+		for(int i = 0 ; i < arcs.size() - 1 ;i++) {
+			if(arcs.get(i).getDestination().compareTo(arcs.get(i+1).getOrigin()) != 0) {
+				return false;
+			}
+		}
+
+		return true;
+	}
+
 	/**
 	 * Compute the length of this path (in meters).
 	 * 
 	 * @return Total length of the path (in meters).
 	 * 
-     * @deprecated Need to be implemented.
 	 */
 	public float getLength() {
-        // TODO:
-        return 0;
+
+		float totalLength = 0.0f;
+
+		for(Arc arc : arcs) {
+			totalLength += arc.getLength();
+		}
+
+
+		return totalLength;
 	}
 
 	/**
@@ -225,11 +322,17 @@ public class Path {
 	 * @return Time (in seconds) required to travel this path at the given speed (in
 	 *         kilometers-per-hour).
 	 * 
-     * @deprecated Need to be implemented.
+	 * 
 	 */
 	public double getTravelTime(double speed) {
-        // TODO:
-        return 0;
+		double totalTime = 0.0d;
+
+		for(Arc arc : arcs) {
+			totalTime += arc.getTravelTime(speed);
+		}
+
+
+		return totalTime;
 	}
 
 	/**
@@ -238,11 +341,17 @@ public class Path {
 	 * 
 	 * @return Minimum travel time to travel this path (in seconds).
 	 * 
-     * @deprecated Need to be implemented.
+	 * 
 	 */
 	public double getMinimumTravelTime() {
-        // TODO:
-        return 0;
+		double totalTime = 0.0d;
+
+		for(Arc arc : arcs) {
+			totalTime += arc.getMinimumTravelTime();
+		}
+
+
+		return totalTime;
 	}
 
 }