Fix exceptions for readers, add path writer.

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

@@ -0,0 +1,44 @@
+package org.insa.graph.io;
+
+import java.io.DataOutputStream;
+import java.io.IOException;
+
+import org.insa.graph.Arc;
+import org.insa.graph.Path;
+
+public class BinaryPathWriter extends BinaryWriter implements AbstractPathWriter {
+
+    /**
+     * @param dos
+     */
+    protected BinaryPathWriter(DataOutputStream dos) {
+        super(dos);
+    }
+
+    @Override
+    public void writePath(Path path) throws IOException {
+
+        // Write magic number and version.
+        dos.writeInt(BinaryPathReader.MAGIC_NUMBER);
+        dos.writeInt(BinaryPathReader.VERSION);
+
+        // Write map id.
+        dos.writeInt(path.getGraph().getMapId());
+
+        // Write number of racs
+        dos.writeInt(path.getArcs().size() + 1);
+
+        // Write origin / destination.
+        dos.writeInt(path.getOrigin().getId());
+        dos.writeInt(path.getDestination().getId());
+
+        // Write nodes.
+        dos.writeInt(path.getOrigin().getId());
+        for (Arc arc: path.getArcs()) {
+            dos.writeInt(arc.getDestination().getId());
+        }
+
+        dos.flush();
+    }
+
+}