Improve arc memory management.

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

@@ -4,7 +4,12 @@ import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 
-public class Arc {
+/**
+ * Implementation of Arc that represents a "forward" arc in a graph, this is the
+ * arc implementation that stores data relative to the arc.
+ *
+ */
+public class ArcForward implements Arc {
 
     // Destination node.
     private final Node origin, destination;
@@ -27,7 +32,8 @@ public class Arc {
      * @param roadInformation Road information for this arc.
      * @param points Points representing this arc.
      */
-    public Arc(Node origin, Node dest, int length, RoadInformation roadInformation, ArrayList<Point> points) {
+    public ArcForward(Node origin, Node dest, int length, RoadInformation roadInformation,
+            ArrayList<Point> points) {
         this.origin = origin;
         this.destination = dest;
         this.length = length;
@@ -37,42 +43,42 @@ public class Arc {
     }
 
     /**
-     * @return Origin node of this arc.
+     * {@inheritDoc}
      */
     public Node getOrigin() {
         return origin;
     }
 
     /**
-     * @return Destination node of this arc.
+     * {@inheritDoc}
      */
     public Node getDestination() {
         return destination;
     }
 
     /**
-     * @return Length of this arc, in meters.
+     * {@inheritDoc}
      */
     public int getLength() {
         return length;
     }
 
     /**
-     * @return Minimum time required to travel this arc, in seconds.
+     * {@inheritDoc}
      */
     public double getMinimumTravelTime() {
         return getLength() * 3600.0 / (info.getMaximumSpeed() * 1000.0);
     }
 
     /**
-     * @return Road information for this arc.
+     * {@inheritDoc}
      */
     public RoadInformation getRoadInformation() {
         return info;
     }
 
     /**
-     * @return Points representing segments of this arc.
+     * {@inheritDoc}
      */
     public List<Point> getPoints() {
         return Collections.unmodifiableList(points);