public boolean sendMessageToUser(User toUser, String content) {
PrivateChat chat = privateChats.get(toUser.getId());
if (chat == null) {
chat = new PrivateChat(this, toUser);
privateChats.put(toUser.getId(), chat);
}
Message message = new Message(content, new Date());
return chat.addMessage(message);
}
public void addConversation(PrivateChat conversation) {
User otherUser = conversation.getOtherParticipant(this);
privateChats.put(otherUser.getId(), conversation);
}