AIMA.Core.Environment.EightPuzzle.EightPuzzleBoard.moveGapUp C# (CSharp) Method

	public void moveGapUp() {
		int gapPos = getGapPosition();
		int x = getXCoord(gapPos);
		int y = getYCoord(gapPos);
		if (!(x == 0)) {
			int valueOnTop = getValueAt(x - 1, y);
			setValue(x, y, valueOnTop);
			setValue(x - 1, y, 0);
		}
	}

            public Object result(Object s, Action a)
            {
                EightPuzzleBoard board = (EightPuzzleBoard)s;

                if (EightPuzzleBoard.UP.Equals(a)
                        && board.canMoveGap(EightPuzzleBoard.UP))
                {
                    EightPuzzleBoard newBoard = new EightPuzzleBoard(board);
                    newBoard.moveGapUp();
                    return newBoard;
                }
                else if (EightPuzzleBoard.DOWN.Equals(a)
                      && board.canMoveGap(EightPuzzleBoard.DOWN))
                {
                    EightPuzzleBoard newBoard = new EightPuzzleBoard(board);
                    newBoard.moveGapDown();
                    return newBoard;
                }
                else if (EightPuzzleBoard.LEFT.Equals(a)
                      && board.canMoveGap(EightPuzzleBoard.LEFT))
                {
                    EightPuzzleBoard newBoard = new EightPuzzleBoard(board);
                    newBoard.moveGapLeft();
                    return newBoard;
                }
                else if (EightPuzzleBoard.RIGHT.Equals(a)
                      && board.canMoveGap(EightPuzzleBoard.RIGHT))
                {
                    EightPuzzleBoard newBoard = new EightPuzzleBoard(board);
                    newBoard.moveGapRight();
                    return newBoard;
                }

                // The Action is not understood or is a NoOp
                // the result will be the current state.
                return s;
            }