Command

public interface Command {
    String getName(); // command name
    List<Area> getAreaList(); // list of command areas
    Command addArea(Area area); // adds an Area to the command
    Size applyAt(CellRef cellRef, Context context); // applies the command at given cell and context
    void reset(); // resets command data for repeatable command usage
    // the next two commands operate on a cell shift mode for the command
    // shift mode currently can take 2 values Command.INNER_SHIFT_MODE (default) and Command.ADJACENT_SHIFT_MODE
    void setShiftMode(String mode);
    String getShiftMode();
}