Renamed Heartbeat to HeartBeat.

Added HeartBeatDecoder.
Added HeartBeatEncoder.
BinaryMessageDecoder now uses HeartBeatDecoder.
MockOutput now logs a warning if a heartBeat cannot be encoded.
Added HeartBeatDecoderTest.
issue #35 #36
#story[1095]

racevisionGame/src/main/java/network/BinaryMessageDecoder.java

@@ -133,9 +133,8 @@ public class BinaryMessageDecoder {
         switch(mType) {
             case HEARTBEAT:
                 //System.out.println("Decoding HeartBeat Message!");
-                //TODO maybe use HeartbeatDecoder.decode(message).
-                //TODO also, decoders for each message type should encapsulate the constructing of the object. E.g., return HeartbeatDecoder.decode(message);.
-                return new Heartbeat(bytesToLong(messageBody));
+                HeartBeatDecoder heartBeatDecoder = new HeartBeatDecoder(messageBody);
+                return heartBeatDecoder.getMessage();
 
             case RACESTATUS:
                 //System.out.println("Race Status Message");

racevisionGame/src/main/java/network/MessageDecoders/HeartBeatDecoder.java

@@ -0,0 +1,53 @@
+package network.MessageDecoders;
+
+import network.Messages.Enums.BoatActionEnum;
+import network.Messages.HeartBeat;
+
+import static network.Utils.ByteConverter.bytesToLong;
+
+/**
+ * Decodes {@link network.Messages.HeartBeat} messages.
+ */
+public class HeartBeatDecoder {
+
+    /**
+     * The encoded message.
+     */
+    private byte[] encodedMessage;
+
+    /**
+     * The decoded message.
+     */
+    private HeartBeat message;
+
+
+
+    /**
+     * Constructs a decoder to decode a given message.
+     * @param encodedMessage The message to decode.
+     */
+    public HeartBeatDecoder(byte[] encodedMessage) {
+        this.encodedMessage = encodedMessage;
+
+        decode();
+    }
+
+
+    /**
+     * Decodes the contained message.
+     */
+    private void decode() {
+
+        message = new HeartBeat(bytesToLong(encodedMessage));
+    }
+
+
+    /**
+     * Returns the decoded message.
+     * @return The decoded message.
+     */
+    public HeartBeat getMessage() {
+        return message;
+    }
+
+}

racevisionGame/src/main/java/network/MessageEncoders/EncoderFactory.java

@@ -29,6 +29,8 @@ public class EncoderFactory {
 
         switch (type) {
 
+            case HEARTBEAT: return new HeartBeatEncoder();
+
             case BOATLOCATION: return new BoatLocationEncoder();
 
             case REQUEST_TO_JOIN: return new RequestToJoinEncoder();

racevisionGame/src/main/java/network/MessageEncoders/HeartBeatEncoder.java

@@ -0,0 +1,40 @@
+package network.MessageEncoders;
+
+
+import network.Messages.AC35Data;
+import network.Messages.HeartBeat;
+
+import java.nio.ByteBuffer;
+
+import static network.Utils.ByteConverter.intToBytes;
+import static network.Utils.ByteConverter.longToBytes;
+
+/**
+ * This encoder can encode a {@link HeartBeat} message.
+ */
+public class HeartBeatEncoder implements MessageEncoder {
+
+
+    /**
+     * Constructor.
+     */
+    public HeartBeatEncoder() {
+    }
+
+
+    @Override
+    public byte[] encode(AC35Data message) {
+
+        //Downcast.
+        HeartBeat heartbeat = (HeartBeat) message;
+
+        //Message is 4 bytes.
+        ByteBuffer heartBeat = ByteBuffer.allocate(4);
+        heartBeat.put(longToBytes(heartbeat.getSequenceNumber(), 4));
+
+        byte[] result = heartBeat.array();
+
+        return result;
+
+    }
+}

racevisionGame/src/main/java/network/MessageEncoders/RaceVisionByteEncoder.java

@@ -19,20 +19,7 @@ import java.util.List;
  */
 public class RaceVisionByteEncoder {
 
-    /**
-     * Serializes a heartbeat message.
-     * @param heartbeat Heartbeat message.
-     * @return Serialized message.
-     */
-    public static byte[] heartBeat(Heartbeat heartbeat) {
 
-        ByteBuffer heartBeat = ByteBuffer.allocate(4);
-        heartBeat.put(longToBytes(heartbeat.getSequenceNumber(), 4));
-
-        byte[] result = heartBeat.array();
-
-        return result;
-    }
 
     /**
      * Serializes a RaceStatus message.

racevisionGame/src/main/java/network/Messages/HeartBeat.java

@@ -6,7 +6,7 @@ import network.Messages.Enums.MessageType;
 /**
  * Represents a Heartbeat message.
  */
-public class Heartbeat extends AC35Data {
+public class HeartBeat extends AC35Data {
 
     /**
      * Sequence number of the heartbeat.
@@ -17,7 +17,7 @@ public class Heartbeat extends AC35Data {
      * Ctor.
      * @param sequenceNumber Sequence number of the heartbeat.
      */
-    public Heartbeat(long sequenceNumber) {
+    public HeartBeat(long sequenceNumber) {
         super(MessageType.HEARTBEAT);
         this.sequenceNumber = sequenceNumber;
     }