Implemented valid and travel time methods

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

@@ -201,20 +201,29 @@ public class Path {
      * @deprecated Need to be implemented.
      */
     public boolean isValid() {
-        // TODO:
-        return false;
+        boolean valid = isEmpty() || (this.arcs.size() == 0 && this.origin != null);
+        if (!valid) {
+            valid = this.arcs.get(0).getOrigin().equals(this.origin);
+            for (int i = 1; i < 3; i++) {
+                if (this.arcs.size() > i)
+                    valid = valid && (this.arcs.get(i).getOrigin().equals(this.arcs.get(i-1).getDestination()));
+            }
+        }
+        return valid;
     }
 
     /**
      * 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 length = 0;
+        for (Arc a : this.arcs) {
+            length += a.getLength();
+        }
+        return length;
     }
 
     /**
@@ -224,12 +233,14 @@ 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;
+        float time = 0;
+        for (Arc a : this.arcs) {
+            time += a.getTravelTime(speed);
+        }
+        return time;
     }
 
     /**
@@ -237,12 +248,14 @@ public class Path {
      * on every arc.
      * 
      * @return Minimum travel time to travel this path (in seconds).
-     * 
-     * @deprecated Need to be implemented.
+     *
      */
     public double getMinimumTravelTime() {
-        // TODO:
-        return 0;
+        float time = 0;
+        for (Arc a : this.arcs) {
+            time += a.getMinimumTravelTime();
+        }
+        return time;
     }
 
 }