class Message implements Serializable {

	public boolean hasAttachment() {
		return attachment != null;
	}

	public  Message();
	public  Message(Integer id, String recipients, String sender, String subject, String content);
	public  Message(Integer id, String recipients, String sender, String subject, String content, String contentType);
	public  Message(Integer id, String recipients, String sender, String subject, String content, String attachment,
	    String attachmentContentType, String attachmentFileName);
	public  Message(Integer id, String recipients, String sender, String subject, String content, String contentType,
	    String attachment, String attachmentContentType, String attachmentFileName);

}