public object Result(object s, IAction a)
{
if (a is QueenAction)
{
QueenAction qa = (QueenAction)a;
NQueensBoard board = (NQueensBoard)s;
NQueensBoard newBoard = new NQueensBoard(board.Size);
newBoard.SetBoard(board.GetQueenPositions());
if (qa.GetName() == QueenAction.PlaceQueen)
{
newBoard.AddQueenAt(qa.GetLocation());
}
else if (qa.GetName() == QueenAction.RemoveQueen)
{
newBoard.RemoveQueenFrom(qa.GetLocation());
}
else if (qa.GetName() == QueenAction.MoveQueen)
{
newBoard.MoveQueenTo(qa.GetLocation());
}
s = newBoard;
}
// if action is not understood or is a NoOp
// the result will be the current state.
return(s);
}
