Enforce immutability via final and unmodifiableList.

src/main/org/insa/algo/weakconnectivity/WeaklyConnectedComponentsAlgorithm.java

@@ -2,9 +2,10 @@ package org.insa.algo.weakconnectivity;
 
 import java.util.ArrayList;
 import java.util.Arrays;
-import java.util.LinkedList;
-import java.util.Queue;
 import java.util.HashSet;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Queue;
 
 import org.insa.algo.AbstractAlgorithm;
 import org.insa.algo.AbstractSolution.Status;
@@ -45,7 +46,8 @@ public class WeaklyConnectedComponentsAlgorithm extends AbstractAlgorithm<Weakly
     }
 
     /**
-	 * Notify all observers that a new node has been found for the current component.
+     * Notify all observers that a new node has been found for the current
+     * component.
      * 
      * @param node New node found for the current component.
      */
@@ -67,7 +69,8 @@ public class WeaklyConnectedComponentsAlgorithm extends AbstractAlgorithm<Weakly
     }
 
     /**
-	 * @return An adjacency list for the undirected graph equivalent to the stored graph.
+     * @return An adjacency list for the undirected graph equivalent to the stored
+     *         graph.
      */
     protected ArrayList<HashSet<Integer>> createUndirectedGraph() {
         int nNodes = getInstance().getGraph().getNodes().size();
@@ -89,8 +92,8 @@ public class WeaklyConnectedComponentsAlgorithm extends AbstractAlgorithm<Weakly
     }
 
     /**
-	 * Apply a breadth first search algorithm on the given undirected graph (adjacency list),
-	 * starting at node cur, and marking nodes in marked.
+     * Apply a breadth first search algorithm on the given undirected graph
+     * (adjacency list), starting at node cur, and marking nodes in marked.
      * 
      * @param marked
      * @param cur
@@ -98,7 +101,7 @@ public class WeaklyConnectedComponentsAlgorithm extends AbstractAlgorithm<Weakly
      * @return
      */
     protected ArrayList<Node> bfs(ArrayList<HashSet<Integer>> ugraph, boolean[] marked, int cur) {
-		ArrayList<Node> nodes = getInstance().getGraph().getNodes();
+        List<Node> nodes = getInstance().getGraph().getNodes();
         ArrayList<Node> component = new ArrayList<Node>();
 
         // Using a queue because we are doing a BFS
@@ -148,7 +151,8 @@ public class WeaklyConnectedComponentsAlgorithm extends AbstractAlgorithm<Weakly
             components.add(this.bfs(ugraph, marked, cur));
 
             // Find next non-marked
-			for (; cur < marked.length && marked[cur]; ++cur);
+            for (; cur < marked.length && marked[cur]; ++cur)
+                ;
         }
 
         return new WeaklyConnectedComponentsSolution(getInstance(), Status.OPTIMAL, components);

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

@@ -1,20 +1,22 @@
 package org.insa.graph;
 
 import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
 
 public class Arc {
 
     // Destination node.
-	private Node origin, destination;
+    private final Node origin, destination;
 
     // Length of the road (in meters).
-	private int length;
+    private final int length;
 
     // Road information.
-	RoadInformation info;
+    private final RoadInformation info;
 
     // Segments.
-	ArrayList<Point> points;
+    private final ArrayList<Point> points;
 
     /**
      * @param dest
@@ -82,11 +84,12 @@ public class Arc {
     }
 
     /**
-	 * @return Points representing segments of this arc. This function may return an empty
-	 * ArrayList if the segments are stored in the reversed arc (for two-ways road).
+     * @return Points representing segments of this arc. This function may return an
+     *         empty ArrayList if the segments are stored in the reversed arc (for
+     *         two-ways road).
      */
-	public ArrayList<Point> getPoints() {
-		return points;
+    public List<Point> getPoints() {
+        return Collections.unmodifiableList(points);
     }
 
 }

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

@@ -1,14 +1,16 @@
 package org.insa.graph;
 
 import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
 
 public class Graph {
 
     // Map identifier.
-	private int mapId;
+    private final int mapId;
 
     // Nodes of the graph.
-	private ArrayList<Node> nodes;
+    private final ArrayList<Node> nodes;
 
     /**
      * @param mapId
@@ -22,7 +24,9 @@ public class Graph {
     /**
      * @return Nodes of this graph.
      */
-	public ArrayList<Node> getNodes() { return nodes; }
+    public List<Node> getNodes() {
+        return Collections.unmodifiableList(nodes);
+    }
 
     /**
      * Find the closet node to the given point.
@@ -47,7 +51,9 @@ public class Graph {
     /**
      * @return Map ID of this graph.
      */
-	public int getMapId() { return mapId; }
+    public int getMapId() {
+        return mapId;
+    }
 
     /**
      * @return Return the transpose graph of this graph.

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

@@ -1,21 +1,23 @@
 package org.insa.graph;
 
 import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
 
 public class Node implements Comparable<Node> {
 
     // ID of the node.
-	private int id;
+    private final int id;
 
     // Point of this graph.
-	private Point point;
+    private final Point point;
 
     // Successors.
-	private ArrayList<Arc> successors;
+    private final ArrayList<Arc> successors;
 
     /**
-	 * Create a new Node corresponding to the given Point with
-	 * an empty list of successors.
+     * Create a new Node corresponding to the given Point with an empty list of
+     * successors.
      * 
      * @param point
      */
@@ -37,17 +39,23 @@ public class Node implements Comparable<Node> {
     /**
      * @return ID of this node.
      */
-	public int getId() { return id; }
+    public int getId() {
+        return id;
+    }
 
     /**
      * @return List of successors of this node.
      */
-	public ArrayList<Arc> getSuccessors() { return successors; }
+    public List<Arc> getSuccessors() {
+        return Collections.unmodifiableList(successors);
+    }
 
     /**
      * @return Point of this node.
      */
-	public Point getPoint() { return point; }
+    public Point getPoint() {
+        return point;
+    }
 
     @Override
     public boolean equals(Object other) {

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

@@ -26,7 +26,7 @@ public class Point {
     }
 
     // Longitude and latitude of the point.
-	private double longitude, latitude;
+    private final double longitude, latitude;
 
     /**
      * 
@@ -41,12 +41,16 @@ public class Point {
     /**
      * @return Longitude of this point (in degrees).
      */
-	public double getLongitude() { return longitude; }
+    public double getLongitude() {
+        return longitude;
+    }
 
     /**
      * @return Latitude of this point (in degrees).
      */
-	public double getLatitude() { return latitude; }
+    public double getLatitude() {
+        return latitude;
+    }
 
     /**
      * Compute the distance from this point to the given point

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

@@ -1,8 +1,7 @@
 package org.insa.graph;
 
 /**
- * Class containing information for road that may be shared
- * by multiple arcs.
+ * Class containing information for road that may be shared by multiple arcs.
  * 
  */
 public class RoadInformation {
@@ -11,35 +10,20 @@ public class RoadInformation {
      * Road type.
      */
     public enum RoadType {
-		MOTORWAY,
-		TRUNK,
-		PRIMARY,
-		SECONDARY,
-		MOTORWAY_LINK,
-		TRUNK_LINK,
-		PRIMARY_LINK,
-		SECONDARY_LINK,
-		TERTIARY,
-		RESIDENTIAL,
-		UNCLASSIFIED,
-		ROAD,
-		LIVING_STREET,
-		SERVICE,
-		ROUNDABOUT,
-		COASTLINE
+        MOTORWAY, TRUNK, PRIMARY, SECONDARY, MOTORWAY_LINK, TRUNK_LINK, PRIMARY_LINK, SECONDARY_LINK, TERTIARY, RESIDENTIAL, UNCLASSIFIED, ROAD, LIVING_STREET, SERVICE, ROUNDABOUT, COASTLINE
     }
 
     // Type of the road (see above).
-	private RoadType type;
+    private final RoadType type;
 
     // One way road?
-	private boolean oneway;
+    private final boolean oneway;
 
     // Max speed in kilometers per hour.
-	private int maxSpeed;
+    private final int maxSpeed;
 
     // Name of the road.
-	private String name;
+    private final String name;
 
     public RoadInformation(RoadType roadType, boolean isOneWay, int maxSpeed, String name) {
         this.type = roadType;
@@ -51,22 +35,30 @@ public class RoadInformation {
     /**
      * @return Type of the road.
      */
-	public RoadType getType() { return type; }
+    public RoadType getType() {
+        return type;
+    }
 
     /**
      * @return true if this is a one-way road.
      */
-	public boolean isOneWay() { return oneway; }
+    public boolean isOneWay() {
+        return oneway;
+    }
 
     /**
      * @return Maximum speed for this road (in km/h).
      */
-	public int getMaximumSpeed() { return maxSpeed; }
+    public int getMaximumSpeed() {
+        return maxSpeed;
+    }
 
     /**
      * @return Name of the road.
      */
-	public String getName() { return name; }
+    public String getName() {
+        return name;
+    }
 
     @Override
     public String toString() {
@@ -77,9 +69,7 @@ public class RoadInformation {
         if (getType() == RoadType.MOTORWAY) {
             typeAsString = "highway";
         }
-		return typeAsString + " : " + getName() 
-				+ " " + (isOneWay() ? " (oneway) " : "") 
-				+ maxSpeed + " km/h (max.)";
+        return typeAsString + " : " + getName() + " " + (isOneWay() ? " (oneway) " : "") + maxSpeed + " km/h (max.)";
     }
 
 }

src/main/org/insa/graphics/drawing/BasicDrawing.java

@@ -11,9 +11,9 @@ import java.awt.event.MouseListener;
 import java.awt.geom.NoninvertibleTransformException;
 import java.awt.geom.Point2D;
 import java.awt.image.BufferedImage;
-import java.util.ArrayList;
 import java.util.IdentityHashMap;
 import java.util.Iterator;
+import java.util.List;
 import java.util.Map;
 
 import javax.swing.JPanel;
@@ -238,14 +238,12 @@ public class BasicDrawing extends JPanel implements Drawing {
     /**
      * Draw the given arc.
      * 
-     * @param arc
-     *            Arc to draw.
-     * @param palette
-     *            Palette to use to retrieve color and width for arc, or null to use
-     *            current settings.
+     * @param arc Arc to draw.
+     * @param palette Palette to use to retrieve color and width for arc, or null to
+     *        use current settings.
      */
     public void drawArc(Arc arc, GraphPalette palette) {
-        ArrayList<Point> pts = arc.getPoints();
+        List<Point> pts = arc.getPoints();
         if (!pts.isEmpty()) {
             if (palette != null) {
                 setColor(palette.getColorForType(arc.getInfo().getType()));

src/main/org/insa/graphics/drawing/utils/PolylineAutoScaling.java

@@ -1,7 +1,7 @@
 package org.insa.graphics.drawing.utils;
 
 import java.awt.Color;
-import java.util.ArrayList;
+import java.util.List;
 
 import org.insa.graph.Point;
 import org.mapsforge.core.graphics.Canvas;
@@ -41,7 +41,7 @@ public class PolylineAutoScaling extends Polyline {
     /**
      * @param points
      */
-    public void add(ArrayList<Point> points) {
+    public void add(List<Point> points) {
         for (Point point: points) {
             add(point);
         }

src/test/org/insa/graph/io/BinaryGraphReaderTest.java

@@ -1,22 +1,15 @@
 package org.insa.graph.io;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
-import static org.junit.jupiter.api.Assertions.fail;
 
 import java.io.IOException;
-import java.util.ArrayList;
+import java.util.List;
 
 import org.insa.graph.Graph;
 import org.insa.graph.Node;
 import org.insa.graph.Point;
-import org.junit.jupiter.api.AfterAll;
-import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeAll;
-import org.junit.jupiter.api.BeforeEach;
-import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
-import org.junit.jupiter.params.ParameterizedTest;
-import org.junit.jupiter.params.provider.MethodSource;
 
 public class BinaryGraphReaderTest {
 
@@ -38,7 +31,7 @@ public class BinaryGraphReaderTest {
 
     @Test
     void testMidipNodes() {
-    		ArrayList<Node> nodes = midip.getNodes();
+        List<Node> nodes = midip.getNodes();
 
         assertEquals(nodes.size(), 150827);