Made discovery more reliable & added docs/tests

- Added unit tests
- Added documentation for discovery classes
- Improved error handling

Tags: #story[1281]

src/main/java/seng302/discoveryServer/util/ServerRepoStreamParser.java

@@ -0,0 +1,109 @@
+package seng302.discoveryServer.util;
+
+
+import seng302.gameServer.messages.Message;
+import seng302.model.stream.packets.PacketType;
+
+import java.io.InputStream;
+import java.util.Arrays;
+
+public class ServerRepoStreamParser {
+    private ReadableByteInputStream inputStream;
+
+    private String roomCode;
+    private String mapName;
+    private ServerListing serverListing;
+
+    public ServerRepoStreamParser(InputStream is){
+        inputStream = new ReadableByteInputStream(is);
+    }
+
+    public PacketType parse() throws Exception {
+        int sync1 = inputStream.readByte();
+        int sync2 = inputStream.readByte();
+
+        PacketType packetType = null;
+
+        if (sync1 == 0x47 && sync2 == 0x83) {
+            int type = inputStream.readByte();
+            inputStream.skipBytes(10);
+            long payloadLength = Message.bytesToLong(inputStream.getBytes(2));
+            byte[] payload = inputStream.getBytes((int) payloadLength);
+            inputStream.skipBytes(4);
+
+            packetType = PacketType.assignPacketType(type, payload);
+
+            switch (packetType) {
+                case ROOM_CODE_REQUEST:
+                    roomCode = parseRoomCodeRequest(payload);
+                    break;
+
+                case LOBBY_REQUEST:
+                    mapName = parseLobbyRequest(payload);
+
+                case SERVER_REGISTRATION:
+                    serverListing = parseServerRegistration(payload);
+                    break;
+            }
+
+        }
+
+        return packetType;
+    }
+    private String parseLobbyRequest(byte[] payload) {
+        int mapNameLength = (int) Message.bytesToLong(Arrays.copyOfRange(payload, 0 ,4));
+
+        return new String(Arrays.copyOfRange(payload, 4, 4+mapNameLength));
+    }
+
+    private String parseRoomCodeRequest(byte[] payload) {
+        int roomCodeLength = (int) Message.bytesToLong(Arrays.copyOfRange(payload, 0 ,6));
+
+        return new String(Arrays.copyOfRange(payload, 6, 6+roomCodeLength));
+    }
+
+    public static ServerListing parseServerRegistration(byte[] payload) {
+        int nameLength = (int) Message.bytesToLong(Arrays.copyOfRange(payload, 0, 6));
+        int mapNameLength = (int) Message.bytesToLong(Arrays.copyOfRange(payload, 6, 12));
+        int addressLength = (int) Message.bytesToLong(Arrays.copyOfRange(payload, 12, 18));
+        int roomCodeLength = (int) Message.bytesToLong(Arrays.copyOfRange(payload, 18, 24));
+
+        int portNumber = (int) Message.bytesToLong(Arrays.copyOfRange(payload, 24, 28));
+        int players = (int) Message.bytesToLong(Arrays.copyOfRange(payload, 28, 32));
+        int capacity = (int) Message.bytesToLong(Arrays.copyOfRange(payload, 32, 36));
+
+        int currentPos = 36;
+        int nextPos = currentPos + nameLength;
+        String serverName = new String(Arrays.copyOfRange(payload, currentPos, nextPos));
+
+        currentPos = nextPos;
+        nextPos = currentPos + mapNameLength;
+        String mapName = new String(Arrays.copyOfRange(payload, currentPos, nextPos));
+
+        currentPos = nextPos;
+        nextPos = currentPos + addressLength;
+        String address = new String(Arrays.copyOfRange(payload, currentPos, nextPos));
+
+        currentPos = nextPos;
+        nextPos = currentPos + roomCodeLength;
+        String roomCode = new String(Arrays.copyOfRange(payload, currentPos, nextPos));
+
+        ServerListing serverListing = new ServerListing(serverName, mapName, address, portNumber, capacity);
+        serverListing.setNumberOfPlayers(players);
+        serverListing.setRoomCode(roomCode);
+
+        return serverListing;
+    }
+
+    public String getRoomCode() {
+        return roomCode;
+    }
+
+    public String getMapName() {
+        return mapName;
+    }
+
+    public ServerListing getServerListing() {
+        return serverListing;
+    }
+}