Add observers to GraphReader.

src/main/org/insa/graph/io/BinaryGraphReaderV2.java

@@ -29,22 +29,38 @@ public class BinaryGraphReaderV2 extends BinaryReader implements GraphReader {
      */
     public static RoadType toRoadType(char ch) {
         switch (ch) {
-			case 'a': return RoadType.MOTORWAY;
-			case 'b': return RoadType.TRUNK;
-			case 'c': return RoadType.PRIMARY;
-			case 'd': return RoadType.SECONDARY;
-			case 'e': return RoadType.MOTORWAY_LINK;
-			case 'f': return RoadType.TRUNK_LINK;
-			case 'g': return RoadType.PRIMARY_LINK;
-			case 'h': return RoadType.SECONDARY_LINK;
-			case 'i': return RoadType.TERTIARY;
-			case 'j': return RoadType.RESIDENTIAL;
-			case 'k': return RoadType.UNCLASSIFIED;
-			case 'l': return RoadType.ROAD;
-			case 'm': return RoadType.LIVING_STREET;
-			case 'n': return RoadType.SERVICE;
-			case 'o': return RoadType.ROUNDABOUT;
-			case 'z': return RoadType.COASTLINE;
+        case 'a':
+            return RoadType.MOTORWAY;
+        case 'b':
+            return RoadType.TRUNK;
+        case 'c':
+            return RoadType.PRIMARY;
+        case 'd':
+            return RoadType.SECONDARY;
+        case 'e':
+            return RoadType.MOTORWAY_LINK;
+        case 'f':
+            return RoadType.TRUNK_LINK;
+        case 'g':
+            return RoadType.PRIMARY_LINK;
+        case 'h':
+            return RoadType.SECONDARY_LINK;
+        case 'i':
+            return RoadType.TERTIARY;
+        case 'j':
+            return RoadType.RESIDENTIAL;
+        case 'k':
+            return RoadType.UNCLASSIFIED;
+        case 'l':
+            return RoadType.ROAD;
+        case 'm':
+            return RoadType.LIVING_STREET;
+        case 'n':
+            return RoadType.SERVICE;
+        case 'o':
+            return RoadType.ROUNDABOUT;
+        case 'z':
+            return RoadType.COASTLINE;
         }
         return RoadType.UNCLASSIFIED;
     }
@@ -68,22 +84,29 @@ public class BinaryGraphReaderV2 extends BinaryReader implements GraphReader {
         // Read map id.
         int mapId = dis.readInt();
 
+        observers.forEach((observer) -> observer.notifyStartReading(mapId));
+
         // Number of descriptors and nodes.
         int nbDesc = dis.readInt();
         int nbNodes = dis.readInt();
 
         // Number of successors for each nodes.
         int[] nbSuccessors = new int[nbNodes];
+        int nbTotalSuccessors = 0;
 
         // Construct an array list with initial capacity of nbNodes.
         ArrayList<Node> nodes = new ArrayList<Node>(nbNodes);
 
         // Read nodes.
+        observers.forEach((observer) -> observer.notifyStartReadingNodes(nbNodes));
         for (int node = 0; node < nbNodes; ++node) {
             float longitude = ((float) dis.readInt()) / 1E6f;
             float latitude = ((float) dis.readInt()) / 1E6f;
             nbSuccessors[node] = dis.readUnsignedByte();
-			nodes.add(new Node(node, new Point(longitude, latitude)));
+            nbTotalSuccessors += nbSuccessors[node];
+            final Node aNode = new Node(node, new Point(longitude, latitude));
+            nodes.add(aNode);
+            observers.forEach((observer) -> observer.notifyNewNodeRead(aNode));
         }
 
         // Check format.
@@ -93,14 +116,19 @@ public class BinaryGraphReaderV2 extends BinaryReader implements GraphReader {
         RoadInformation[] descs = new RoadInformation[nbDesc];
 
         // Read
+        observers.forEach((observer) -> observer.notifyStartReadingDescriptors(nbDesc));
         for (int descr = 0; descr < nbDesc; ++descr) {
-			descs[descr] = readRoadInformation();
+            final RoadInformation roadinf = readRoadInformation();
+            descs[descr] = roadinf;
+            observers.forEach((observer) -> observer.notifyNewDescriptorRead(roadinf));
         }
 
         // Check format.
         checkByteOrThrow(254);
 
         // Read successors and convert to arcs.
+        final int copyNbTotalSuccesors = nbTotalSuccessors; // Stupid Java...
+        observers.forEach((observer) -> observer.notifyStartReadingArcs(copyNbTotalSuccesors));
         for (int node = 0; node < nbNodes; ++node) {
             for (int succ = 0; succ < nbSuccessors[node]; ++succ) {
 
@@ -126,8 +154,7 @@ public class BinaryGraphReaderV2 extends BinaryReader implements GraphReader {
                     float dlon = (dis.readShort()) / 2.0e5f;
                     float dlat = (dis.readShort()) / 2.0e5f;
 
-					points.add(new Point(lastPoint.getLongitude() + dlon,
-										lastPoint.getLatitude() + dlat));
+                    points.add(new Point(lastPoint.getLongitude() + dlon, lastPoint.getLatitude() + dlat));
                 }
 
                 points.add(nodes.get(destNode).getPoint());
@@ -137,7 +164,7 @@ public class BinaryGraphReaderV2 extends BinaryReader implements GraphReader {
                 Node dest = nodes.get(destNode);
 
                 // Add successor to initial arc.
-				new Arc(orig, dest, length, info, points);
+                Arc arc = new Arc(orig, dest, length, info, points);
 
                 // And reverse arc if its a two-way road.
                 if (!info.isOneWay()) {
@@ -146,13 +173,15 @@ public class BinaryGraphReaderV2 extends BinaryReader implements GraphReader {
                     Collections.reverse(rPoints);
                     new Arc(dest, orig, length, info, rPoints);
                 }
-					
+                observers.forEach((observer) -> observer.notifyNewArcRead(arc));
             }
         }
 
         // Check format.
         checkByteOrThrow(253);
 
+        observers.forEach((observer) -> observer.notifyEndReading());
+
         return new Graph(mapId, nodes);
     }
 

src/main/org/insa/graph/io/BinaryReader.java

@@ -2,6 +2,8 @@ package org.insa.graph.io;
 
 import java.io.DataInputStream;
 import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
 
 public abstract class BinaryReader {
 
@@ -12,12 +14,22 @@ public abstract class BinaryReader {
     // InputStream
     protected DataInputStream dis;
 
+    // List of observers
+    protected List<GraphReaderObserver> observers = new ArrayList<>();
+
     protected BinaryReader(int magicNumber, int version, DataInputStream dis) {
         this.magicNumber = magicNumber;
         this.version = version;
         this.dis = dis;
     }
 
+    /**
+     * {@inheritDoc}
+     */
+    public void addObserver(GraphReaderObserver observer) {
+        observers.add(observer);
+    }
+
     /**
      * @param version
      * @throws BadVersionException
@@ -39,9 +51,8 @@ public abstract class BinaryReader {
     }
 
     /**
-	 * Check if the next byte in the input stream correspond to the
-	 * given byte. This function consumes the next byte in the input
-	 * stream.
+     * Check if the next byte in the input stream correspond to the given byte. This
+     * function consumes the next byte in the input stream.
      * 
      * @param i Byte to check against.
      * 

src/main/org/insa/graph/io/GraphReader.java

@@ -6,6 +6,13 @@ import org.insa.graph.Graph;
 
 public interface GraphReader {
 
+    /**
+     * Add a new observer to this graph reader.
+     * 
+     * @param observer
+     */
+    public void addObserver(GraphReaderObserver observer);
+
     /**
      * Read a graph an returns it.
      * 

src/main/org/insa/graph/io/GraphReaderObserver.java

@@ -0,0 +1,64 @@
+package org.insa.graph.io;
+
+import org.insa.graph.Arc;
+import org.insa.graph.Node;
+import org.insa.graph.RoadInformation;
+
+public interface GraphReaderObserver {
+
+    /**
+     * Notify observer about information on the graph, this method is always the
+     * first called
+     * 
+     * @param mapId ID of the graph.
+     */
+    public void notifyStartReading(int mapId);
+
+    /**
+     * Notify that the graph has been fully read.
+     */
+    public void notifyEndReading();
+
+    /**
+     * Notify that the reader is starting to read node.
+     * 
+     * @param nNodes Number of nodes to read.
+     */
+    public void notifyStartReadingNodes(int nNodes);
+
+    /**
+     * Notify that a new nodes has been read.
+     * 
+     * @param node
+     */
+    public void notifyNewNodeRead(Node node);
+
+    /**
+     * Notify that the reader is starting to read descriptor/road informations.
+     * 
+     * @param nDesc Number of descriptors to read.
+     */
+    public void notifyStartReadingDescriptors(int nDesc);
+
+    /**
+     * Notify that a new descriptor has been read.
+     * 
+     * @param desc
+     */
+    public void notifyNewDescriptorRead(RoadInformation desc);
+
+    /**
+     * Notify that the reader is starting to read arcs.
+     * 
+     * @param nArcs Number of arcs to read (!= number of arcs in the graph).
+     */
+    public void notifyStartReadingArcs(int nArcs);
+
+    /**
+     * Notify that a new arc has been read.
+     * 
+     * @param arc
+     */
+    public void notifyNewArcRead(Arc arc);
+
+}

src/main/org/insa/graphics/GraphReaderProgressBar.java

@@ -0,0 +1,131 @@
+package org.insa.graphics;
+
+import java.awt.Component;
+import java.awt.Dimension;
+
+import javax.swing.Box;
+import javax.swing.BoxLayout;
+import javax.swing.JDialog;
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JPanel;
+import javax.swing.JProgressBar;
+import javax.swing.border.EmptyBorder;
+
+import org.insa.graph.Arc;
+import org.insa.graph.Node;
+import org.insa.graph.RoadInformation;
+import org.insa.graph.io.GraphReaderObserver;
+
+/**
+ * One-time use GraphReaderObserver that display progress in three different
+ * JProgressBar.
+ * 
+ * @author Mikael
+ *
+ */
+public class GraphReaderProgressBar extends JDialog implements GraphReaderObserver {
+
+    /**
+     * 
+     */
+    private static final long serialVersionUID = -1;
+
+    // Index...
+    private static final int NODE = 0, DESC = 1, ARC = 2;
+
+    // Progress bar
+    private final JProgressBar[] progressBars = new JProgressBar[3];
+
+    // Current element read, and modulo.
+    private int[] counters = new int[] { 0, 0, 0 };
+    private int[] modulos = new int[3];
+
+    public GraphReaderProgressBar(JFrame owner) {
+        super(owner);
+        this.setVisible(false);
+        setDefaultCloseOperation(JDialog.DO_NOTHING_ON_CLOSE);
+
+        final String[] infos = { "nodes", "road informations", "arcs" };
+
+        JPanel pane = new JPanel();
+        pane.setLayout(new BoxLayout(pane, BoxLayout.PAGE_AXIS));
+        pane.setBorder(new EmptyBorder(15, 15, 15, 15));
+        pane.add(Box.createVerticalGlue());
+
+        for (int i = 0; i < 3; ++i) {
+            JLabel label = new JLabel("Reading " + infos[i] + "... ");
+            label.setAlignmentX(Component.LEFT_ALIGNMENT);
+            progressBars[i] = new JProgressBar();
+            progressBars[i].setAlignmentX(Component.LEFT_ALIGNMENT);
+            pane.add(label);
+            pane.add(progressBars[i]);
+        }
+
+        pane.add(Box.createVerticalGlue());
+
+        pane.setPreferredSize(new Dimension(300, 120));
+
+        setContentPane(pane);
+
+        // setModal(true);
+        setLocationRelativeTo(owner);
+
+        pack();
+
+    }
+
+    @Override
+    public void notifyStartReading(int mapId) {
+        setTitle(String.format("Reading graph %#x... ", mapId));
+        setVisible(true);
+    }
+
+    @Override
+    public void notifyEndReading() {
+        setVisible(false);
+    }
+
+    protected void initProgressBar(int index, int max) {
+        progressBars[index].setMaximum(max);
+        modulos[index] = max / 100;
+    }
+
+    protected void incCounter(int index) {
+        counters[index] += 1;
+        if (counters[index] % modulos[index] == 0) {
+            progressBars[index].setValue(counters[index]);
+        }
+    }
+
+    @Override
+    public void notifyStartReadingNodes(int nNodes) {
+        initProgressBar(NODE, nNodes);
+    }
+
+    @Override
+    public void notifyNewNodeRead(Node node) {
+        incCounter(NODE);
+    }
+
+    @Override
+    public void notifyStartReadingDescriptors(int nDesc) {
+        initProgressBar(DESC, nDesc);
+    }
+
+    @Override
+    public void notifyNewDescriptorRead(RoadInformation desc) {
+        incCounter(DESC);
+    }
+
+    @Override
+    public void notifyStartReadingArcs(int nArcs) {
+        initProgressBar(ARC, nArcs);
+    }
+
+    @Override
+    public void notifyNewArcRead(Arc arc) {
+        incCounter(ARC);
+    }
+
+}

src/main/org/insa/graphics/MainWindow.java

@@ -518,6 +518,7 @@ public class MainWindow extends JFrame {
                             else {
                                 reader = new BinaryGraphReader(stream);
                             }
+                            reader.addObserver(new GraphReaderProgressBar(MainWindow.this));
                             try {
                                 graph = reader.read();
                             }