Use case classes, cleaned up code.

app/src/main/scala/com/nutomic/ensichat/activities/EnsiChatActivity.scala

@@ -10,9 +10,9 @@ import com.nutomic.ensichat.bluetooth.{ChatService, ChatServiceBinder}
  */
 class EnsiChatActivity extends Activity with ServiceConnection {
 
-  var chatService: Option[ChatService] = None
+  private var chatService: Option[ChatService] = None
 
-  var listeners = Set[() => Unit]()
+  private var listeners = Set[() => Unit]()
 
   /**
    * Starts service and connects to it.

app/src/main/scala/com/nutomic/ensichat/bluetooth/ChatService.scala

@@ -26,8 +26,6 @@ object ChatService {
    */
   val appUuid: UUID = UUID.fromString("8ed52b7a-4501-5348-b054-3d94d004656e")
 
-  val KEY_GENERATION_FINISHED = "com.nutomic.ensichat.messages.KEY_GENERATION_FINISHED"
-
   /**
    * Used with [[ChatService.registerConnectionListener]], called when a bluetooth device
    * connects or disconnects

app/src/main/scala/com/nutomic/ensichat/bluetooth/ConnectThread.scala

@@ -11,9 +11,9 @@ import android.util.Log
 class ConnectThread(device: Device, onConnected: (Device, BluetoothSocket) => Unit)
     extends Thread {
 
-  val Tag = "ConnectThread"
+  private val Tag = "ConnectThread"
 
-  val Socket: BluetoothSocket =
+  private val Socket: BluetoothSocket =
       device.bluetoothDevice.createInsecureRfcommSocketToServiceRecord(ChatService.appUuid)
 
   override def run(): Unit = {

app/src/main/scala/com/nutomic/ensichat/bluetooth/Device.scala

@@ -9,16 +9,10 @@ private[bluetooth] object Device {
    *
    * @param Id A bluetooth device address.
    */
-  class ID(private val Id: String) {
+  case class ID(private val Id: String) {
+
     require(Id.matches("([A-Z0-9][A-Z0-9]:){5}[A-Z0-9][A-Z0-9]"), "Invalid device ID format")
 
-    override def hashCode = Id.hashCode
-
-    override def equals(a: Any) = a match {
-      case o: Device.ID => Id == o.Id
-      case _ => false
-    }
-
     override def toString = Id
 
   }
@@ -28,16 +22,13 @@ private[bluetooth] object Device {
 /**
  * Holds information about a remote bluetooth device.
  */
-private[bluetooth] class Device(val Id: Device.ID, val Name: String, val Connected: Boolean,
+private[bluetooth] case class Device(Id: Device.ID, Name: String, Connected: Boolean,
              btDevice: Option[BluetoothDevice] = None) {
 
-  def this(btDevice: BluetoothDevice, connected: Boolean) {
+  def this(btDevice: BluetoothDevice, connected: Boolean) = {
     this(new Device.ID(btDevice.getAddress), btDevice.getName, connected, Option(btDevice))
   }
 
   def bluetoothDevice = btDevice.get
 
-  override def toString = "Device(Id=" + Id + ", Name=" + Name + ", Connected=" + Connected +
-    ", btDevice=" + btDevice + ")"
-
 }

app/src/main/scala/com/nutomic/ensichat/bluetooth/ListenThread.scala

@@ -13,9 +13,9 @@ import android.util.Log
 class ListenThread(name: String, adapter: BluetoothAdapter,
                    onConnected: (Device, BluetoothSocket) => Unit) extends Thread {
 
-  val Tag: String = "ListenThread"
+  private val Tag: String = "ListenThread"
 
-  val ServerSocket: BluetoothServerSocket =
+  private val ServerSocket: BluetoothServerSocket =
     try {
       adapter.listenUsingInsecureRfcommWithServiceRecord(name, ChatService.appUuid)
     } catch {

app/src/main/scala/com/nutomic/ensichat/protocol/Address.scala

@@ -23,7 +23,7 @@ object Address {
  *
  * @param Bytes SHA-256 hash of the node's public key.
  */
-class Address(val Bytes: Array[Byte]) {
+case class Address(Bytes: Array[Byte]) {
 
   require(Bytes.length == Address.Length, "Invalid address length (was " + Bytes.length + ")")
 

app/src/main/scala/com/nutomic/ensichat/protocol/messages/ConnectionInfo.scala

@@ -31,7 +31,7 @@ object ConnectionInfo {
 /**
  * Holds a node's public key.
  */
-class ConnectionInfo(val key: PublicKey) extends MessageBody {
+case class ConnectionInfo(key: PublicKey) extends MessageBody {
 
   override def Type = ConnectionInfo.Type
 
@@ -42,13 +42,6 @@ class ConnectionInfo(val key: PublicKey) extends MessageBody {
     b.array()
   }
 
-  override def equals(a: Any): Boolean = a match {
-    case o: ConnectionInfo => key == o.key
-    case _ => false
-  }
-
-  override def toString = "ConnectionInfo(key=" + key + ")"
-
   override def length = 4 + key.getEncoded.length
 
 }

app/src/main/scala/com/nutomic/ensichat/protocol/messages/CryptoData.scala

@@ -36,7 +36,7 @@ object CryptoData {
 /**
  * Holds the signature and (optional) key that are stored in a message.
  */
-class CryptoData(val Signature: Option[Array[Byte]], val Key: Option[Array[Byte]]) {
+case class CryptoData(Signature: Option[Array[Byte]], Key: Option[Array[Byte]]) {
 
   override def equals(a: Any): Boolean = a match {
     case o: CryptoData =>
@@ -61,7 +61,4 @@ class CryptoData(val Signature: Option[Array[Byte]], val Key: Option[Array[Byte]
 
   private def keyLength = if (Key.isDefined) Key.get.length else 0
 
-  override def toString = "CryptoData(Signature.length=" + Signature.foreach(_.length) +
-    ", Key.length=" + Key.foreach(_.length) + ")"
-
 }

app/src/main/scala/com/nutomic/ensichat/protocol/messages/EncryptedBody.scala

@@ -3,13 +3,11 @@ package com.nutomic.ensichat.protocol.messages
 /**
  * Represents the data in an encrypted message body.
  */
-class EncryptedBody(val Data: Array[Byte]) extends MessageBody {
+case class EncryptedBody(Data: Array[Byte]) extends MessageBody {
 
   override def Type = -1
 
   def write = Data
 
-  override def toString = "EncryptedBody(Data.length=" + Data.length + ")"
-
   override def length = Data.length
 }

app/src/main/scala/com/nutomic/ensichat/protocol/messages/Message.scala

@@ -33,18 +33,11 @@ object Message {
 
 }
 
-class Message(val Header: MessageHeader, val Crypto: CryptoData, val Body: MessageBody) {
+case class Message(Header: MessageHeader, Crypto: CryptoData, Body: MessageBody) {
 
   def this(header: MessageHeader, body: MessageBody) =
     this(header, new CryptoData(None, None), body)
 
   def write = Header.write(Body.length + Crypto.length) ++ Crypto.write ++ Body.write
 
-  override def toString = "Message(Header=" + Header + ", Body=" + Body + ", Crypto=" + Crypto + ")"
-
-  override def equals(a: Any): Boolean = a match {
-    case o: Message => Header == o.Header && Body == o.Body && Crypto == o.Crypto
-    case _ => false
-  }
-
 }

app/src/main/scala/com/nutomic/ensichat/protocol/messages/MessageHeader.scala

@@ -46,15 +46,15 @@ object MessageHeader {
 /**
  * First part of any message, used for routing.
  */
-class MessageHeader(val MessageType: Int,
+case class MessageHeader(MessageType: Int,
-                    val HopLimit: Int,
+                    HopLimit: Int,
-                    val Origin: Address,
+                    Origin: Address,
-                    val Target: Address,
+                    Target: Address,
-                    val SequenceNumber: Int,
+                    SequenceNumber: Int,
-                    val Metric: Int,
+                    Metric: Int,
-                    val Time: Date = new Date(),
+                    Time: Date = new Date(),
-                    val Length: Long = -1,
+                    Length: Long = -1,
-                    val HopCount: Int = 0) {
+                    HopCount: Int = 0) {
 
   /**
    * Writes the header to byte array.
@@ -93,9 +93,4 @@ class MessageHeader(val MessageType: Int,
     case _ => false
   }
 
-  override def toString = "MessageHeader(Version=" + MessageHeader.Version +
-    ", Type=" + MessageType + ", HopLimit=" + HopLimit + ", HopCount=" + HopCount +
-    ", Time=" + Time + ", Origin=" + Origin + ", Target=" + Target + ", SeqNum=" +
-    ", Metric=" + Metric + ", Length=" + Length + ", HopCount=" + HopCount + ")"
-
 }

app/src/main/scala/com/nutomic/ensichat/protocol/messages/RequestAddContact.scala

@@ -18,7 +18,7 @@ object RequestAddContact {
 /**
  * Sent when the user initiates adding another device as a contact.
  */
-class RequestAddContact extends MessageBody {
+case class RequestAddContact() extends MessageBody {
 
   override def Type = RequestAddContact.Type
 
@@ -27,8 +27,6 @@ class RequestAddContact extends MessageBody {
     b.array()
   }
 
-  override def toString = "RequestAddContact()"
-
   override def length = 4
 
 }

app/src/main/scala/com/nutomic/ensichat/protocol/messages/ResultAddContact.scala

@@ -23,7 +23,7 @@ object ResultAddContact {
 /**
  * Contains the result of a [[RequestAddContact]] message.
  */
-class ResultAddContact(val Accepted: Boolean) extends MessageBody {
+case class ResultAddContact(Accepted: Boolean) extends MessageBody {
 
   override def Type = ResultAddContact.Type
 
@@ -34,8 +34,6 @@ class ResultAddContact(val Accepted: Boolean) extends MessageBody {
     b.array()
   }
 
-  override def toString = "ResultAddContact(Accepted=" + Accepted + ")"
-
   override def length = 4
 
 }

app/src/main/scala/com/nutomic/ensichat/protocol/messages/Text.scala

@@ -26,7 +26,7 @@ object Text {
 /**
  * Holds a plain text message.
  */
-class Text(val text: String) extends MessageBody {
+case class Text(text: String) extends MessageBody {
 
   override def Type = Text.Type
 
@@ -38,13 +38,6 @@ class Text(val text: String) extends MessageBody {
     b.array()
   }
 
-  override def equals(a: Any): Boolean = a match {
-    case o: Text => text == o.text
-    case _ => false
-  }
-
-  override def toString = "Text(" + text + ")"
-
   override def length = write.length
 
 }

app/src/main/scala/com/nutomic/ensichat/util/IdenticonGenerator.scala

@@ -13,9 +13,9 @@ import com.nutomic.ensichat.protocol.Address
  */
 object IdenticonGenerator {
 
-  val Height: Int = 5
+  private val Height: Int = 5
 
-  val Width: Int = 5
+  private val Width: Int = 5
 
   /**
    * Generates an identicon for the key.