Made id a mandatory field in MessageBuilder

Added support for IdGenerator in the MessageBuilder constructor.

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

@@ -67,17 +67,17 @@ public class Message implements Serializable {
 	 * @param id           unique ID
 	 * @param senderId     the ID of the user who sends the message
 	 * @param recipientId  the ID of the user who receives the message
-	 * @param date        the creation date of the message
+	 * @param creationDate the creation date of the message
 	 * @param text         the text content of the message
 	 * @param attachment   the attachment of the message, if present
 	 * @param status       the current {@link MessageStatus} of the message
 	 * @since Envoy Common v0.2-alpha
 	 */
-	Message(long id, long senderId, long recipientId, Date date, String text, MessageAttachment<?> attachment, MessageStatus status) {
+	Message(long id, long senderId, long recipientId, Date creationDate, String text, MessageAttachment<?> attachment, MessageStatus status) {
 		this.id				= id;
 		this.senderId		= senderId;
 		this.recipientId	= recipientId;
-		creationDate	= date;
+		this.creationDate	= creationDate;
 		this.text			= text;
 		this.attachment		= attachment;
 		this.status			= status;

src/main/java/envoy/data/MessageBuilder.java

@@ -21,7 +21,7 @@ public class MessageBuilder {
 
 	// Properties with default values
 	private long					id;
-	private Date					date;
+	private Date					creationDate;
 	private String					text;
 	private MessageAttachment<?>	attachment;
 	private Message.MessageStatus	status;
@@ -32,11 +32,27 @@ public class MessageBuilder {
 	 *
 	 * @param senderId    the ID of the user who sends the {@link Message}
 	 * @param recipientId the ID of the user who received the {@link Message}
+	 * @param idGenerator the ID generator used to generate a unique {@link Message}
+	 *                    id
 	 * @since Envoy Common v0.2-alpha
 	 */
-	public MessageBuilder(long senderId, long recipientId) {
+	public MessageBuilder(long senderId, long recipientId, IdGenerator idGenerator) {
+		this(senderId, recipientId, idGenerator.next());
+	}
+
+	/**
+	 * Creates an instance of {@link MessageBuilder} with all mandatory values
+	 * without defaults for the {@link Message} class.
+	 *
+	 * @param senderId    the ID of the user who sends the {@link Message}
+	 * @param recipientId the ID of the user who received the {@link Message}
+	 * @param messageId   the ID of the {@link Message}
+	 * @since Envoy Common v0.2-alpha
+	 */
+	public MessageBuilder(long senderId, long recipientId, long messageId) {
 		this.senderId		= senderId;
 		this.recipientId	= recipientId;
+		id					= messageId;
 	}
 
 	/**
@@ -63,30 +79,20 @@ public class MessageBuilder {
 	 */
 	public Message build() {
 		// Supplement default values
-		if (date == null) date = new Date();
+		if (creationDate == null) creationDate = new Date();
 		if (text == null) text = "";
 		if (status == null) status = MessageStatus.WAITING;
 
-		return new Message(id, senderId, recipientId, date, text, attachment, status);
+		return new Message(id, senderId, recipientId, creationDate, text, attachment, status);
 	}
 
 	/**
-	 * @param id the unique ID of the {@link Message} to create
+	 * @param creationDate the creation date of the {@link Message} to create
 	 * @return this {@link MessageBuilder}
 	 * @since Envoy Common v0.2-alpha
 	 */
-	public MessageBuilder setId(long id) {
+	public MessageBuilder setDate(Date creationDate) {
-		this.id = id;
+		this.creationDate = creationDate;
-		return this;
-	}
-
-	/**
-	 * @param date the creation date of the {@link Message} to create
-	 * @return this {@link MessageBuilder}
-	 * @since Envoy Common v0.2-alpha
-	 */
-	public MessageBuilder setDate(Date date) {
-		this.date = date;
 		return this;
 	}