Fix exceptions for readers, add path writer.

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

@@ -1,5 +1,7 @@
 package org.insa.graph.io;
 
+import java.io.IOException;
+
 import org.insa.graph.Graph;
 
 public interface AbstractGraphReader {
@@ -11,6 +13,6 @@ public interface AbstractGraphReader {
      * @throws Exception
      * 
      */
-	public Graph read() throws Exception;
+    public Graph read() throws IOException;
 
 }

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

@@ -1,5 +1,7 @@
 package org.insa.graph.io;
 
+import java.io.IOException;
+
 import org.insa.graph.Graph;
 import org.insa.graph.Path;
 
@@ -13,6 +15,6 @@ public interface AbstractPathReader {
      * @return A new path.
      * @throws Exception
      */
-	public Path readPath(Graph graph) throws Exception;
+    public Path readPath(Graph graph) throws IOException;
 
 }

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

@@ -0,0 +1,18 @@
+package org.insa.graph.io;
+
+import java.io.IOException;
+
+import org.insa.graph.Path;
+
+public interface AbstractPathWriter {
+
+    /**
+     * Write a path.
+     * 
+     * @param path Path to write.
+     * 
+     * @throws Exception
+     */
+    public void writePath(Path path) throws IOException;
+
+}

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

@@ -12,15 +12,15 @@ import org.insa.graph.Path.CreationMode;
 public class BinaryPathReader extends BinaryReader implements AbstractPathReader {
 
     // Map version and magic number targeted for this reader.
-	private static final int VERSION = 1;
+    protected static final int VERSION = 1;
-	private static final int MAGIC_NUMBER = 0xdecafe;
+    protected static final int MAGIC_NUMBER = 0xdecafe;
 
     public BinaryPathReader(DataInputStream dis) {
         super(MAGIC_NUMBER, VERSION, dis);
     }
 
     @Override
-	public Path readPath(Graph graph) throws Exception {
+    public Path readPath(Graph graph) throws IOException {
 
         // Read and check magic number and version.
         checkMagicNumberOrThrow(dis.readInt());

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();
+    }
+
+}

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

@@ -0,0 +1,30 @@
+package org.insa.graph.io;
+
+import java.io.DataOutputStream;
+import java.io.IOException;
+
+public abstract class BinaryWriter {
+
+    // Output stream.
+    protected DataOutputStream dos;
+
+    /**
+     * @param dos
+     */
+    protected BinaryWriter(DataOutputStream dos) {
+        this.dos = dos;
+    }
+
+    /**
+     * Write a 24-bits integer in BigEndian to the output stream.
+     * 
+     * @param value
+     * 
+     * @throws IOException
+     */
+    protected void write24bits(int value) throws IOException {
+        dos.writeShort(value >> 8);
+        dos.writeByte(value & 0xff);
+    }
+
+}

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

@@ -1,6 +1,8 @@
 package org.insa.graph.io;
 
-public class MapMismatchException extends Exception {
+import java.io.IOException;
+
+public class MapMismatchException extends IOException {
 
     /**
      *