withTerminal method

@override ID withTerminal(String newTerminal)

Dressed ID: name@address/terminal

Implementation

@override
ID withTerminal(String newTerminal) {
  // check old terminal (device)
  String oldTerminal = terminal ?? '';
  if (newTerminal.isEmpty) {
    // should not happen
    return oldTerminal.isEmpty ? this : ID.create(name: name, address: address);
  }
  // new terminal not empty (normally),
  // try to add/replace terminal
  if (newTerminal == oldTerminal) {
    // old terminal equals to the new terminal,
    // nothing changed
    return this;
  }
  // create new ID with terminal
  return ID.create(name: name, address: address, terminal: newTerminal);
}