Getting editing information

• getWarning()
  Gets and returns the warning message. If the operation is successful, it will return null.
• clearWarning()
  Clears the warning message.
• getError()
  Gets and returns the error message. If the operation is successful, it will return null.
• clearError()
  Clears the error message.
• clearMsg()
  Clears all warning and error messages.
• setLog(OutputStream log, String encoding)
  Sets the log to get error, debug and other information.
• writeLog(String msg)
  Writes all messages to the log.
• closeLog() throws IOException
  Closes the log.