Length -> Float. Fix issue with duplicated backward arcs.

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

@@ -31,7 +31,7 @@ public abstract class Arc {
     /**
      * @return Length of this arc, in meters.
      */
-    public abstract double getLength();
+    public abstract float getLength();
 
     /**
      * Compute the time required to travel this arc if moving at the given speed.

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

@@ -13,7 +13,7 @@ import java.util.List;
 class ArcBackward extends Arc {
 
     // Original arc
-    private final ArcForward originalArc;
+    private final Arc originalArc;
 
     /**
      * Create a new backward arc which corresponds to the reverse arc of the given
@@ -21,9 +21,8 @@ class ArcBackward extends Arc {
      * 
      * @param originalArc Original forwarc arc corresponding to this backward arc.
      */
-    protected ArcBackward(ArcForward originalArc) {
+    protected ArcBackward(Arc originalArc) {
         this.originalArc = originalArc;
-        this.originalArc.getDestination().addSuccessor(this);
     }
 
     @Override
@@ -37,7 +36,7 @@ class ArcBackward extends Arc {
     }
 
     @Override
-    public double getLength() {
+    public float getLength() {
         return this.originalArc.getLength();
     }
 

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

@@ -1,6 +1,5 @@
 package org.insa.graph;
 
-import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 
@@ -21,7 +20,7 @@ class ArcForward extends Arc {
     private final RoadInformation info;
 
     // Segments.
-    private final ArrayList<Point> points;
+    private final List<Point> points;
 
     /**
      * Create a new ArcForward with the given attributes.
@@ -33,7 +32,7 @@ class ArcForward extends Arc {
      * @param points Points representing this arc.
      */
     protected ArcForward(Node origin, Node dest, float length, RoadInformation roadInformation,
-            ArrayList<Point> points) {
+            List<Point> points) {
         this.origin = origin;
         this.destination = dest;
         this.length = length;
@@ -52,7 +51,7 @@ class ArcForward extends Arc {
     }
 
     @Override
-    public double getLength() {
+    public float getLength() {
         return length;
     }