note_command.dart

abstract class NoteCommand {
  final String id;
  final String uid;

  /// Defines an reversible action to a note, provides the note [id], and the current user's [uid].
  const NoteCommand({
    @required this.id,
    @required this.uid,
  });

  /// Returns message about the result of the action.
  String get message => '';

  /// Executes this command.
  Future<void> execute();

  /// Undo this command.
  Future<void> revert();
}