Add observers to GraphReader.

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();
                             }