//Simple enumeration for user commands public enum UserCommand { SEND_MESSAGE, SEND_FILE }

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try { DataOutputStream output = new DataOutputStream(peerSocket.getOutputStream()); logger.log("Waiting for user text"); while (running) { String userInput = scanner.nextLine();

UserCommand command = parseUserCommand(userInput); if (command == UserCommand.SEND_MESSAGE) { sendTextMessage(output, userInput); } else { String filename = parseFilename(userInput); String filelocation = parseFileLocation(userInput); sendFile(output, filename, filelocation); } output.flush(); } } catch (IOException e) { running = false; }

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could someone explain to me what exactly this class do .