Storing sender and recipient IDs in message, added contact list to User

src/main/java/envoy/data/Message.java

@@ -48,8 +48,8 @@ public class Message implements Serializable {
 		READ
 	}
 
-	private final long					id;
-	private final User					sender, recipient;
+	private final long					id, senderId, recipientId;
+	private final transient User		sender, recipient;
 	private final Date					date;
 	private final String				text;
 	private final MessageAttachment<?>	attachment;
@@ -81,6 +81,9 @@ public class Message implements Serializable {
 		this.text		= text;
 		this.attachment	= attachment;
 		this.status		= status;
+
+		senderId	= sender.getId();
+		recipientId	= recipient.getId();
 	}
 
 	/**
@@ -124,12 +127,24 @@ public class Message implements Serializable {
 	 */
 	public User getSender() { return sender; }
 
+	/**
+	 * @return the sender ID of this message
+	 * @since Envoy Common v0.2-alpha
+	 */
+	public long getSenderId() { return senderId; }
+
 	/**
 	 * @return the recipient of this message
 	 * @since Envoy Common v0.2-alpha
 	 */
 	public User getRecipient() { return recipient; }
 
+	/**
+	 * @return the recipient ID of this message
+	 * @since Envoy Common v0.2-alpha
+	 */
+	public long getRecipientId() { return recipientId; }
+
 	/**
 	 * @return the date at which this message was created
 	 * @since Envoy Common v0.2-alpha

src/main/java/envoy/data/User.java

@@ -1,6 +1,8 @@
 package envoy.data;
 
 import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.List;
 
 /**
  * Represents a unique user with a unique, numeric ID, a name and a current
@@ -46,6 +48,7 @@ public class User implements Serializable {
 
 	private final long			id;
 	private final String		name;
+	private final List<User>	contacts	= new ArrayList<>();
 
 	private UserStatus status;
 
@@ -80,6 +83,12 @@ public class User implements Serializable {
 	 */
 	public String getName() { return name; }
 
+	/**
+	 * @return a list of all users this user can send messages to
+	 * @since Envoy Client v0.2-alpha
+	 */
+	public List<User> getContacts() { return contacts; }
+
 	/**
 	 * @return the current status of this user
 	 * @since Envoy Client v0.2-alpha