public static void PositionShip(IArrayBoardObject board, IShip battleship, Position battleshipPosition, Orientation battleshipOrientation)
{
// collate positional information
Position shipEndPosition = battleship.CalculateEndPosition(battleshipPosition, battleshipOrientation);
// traverse in reverse order, to immediately throw an exception if the ship is not entirely on the board
List <ILocation> shipLocations = new List <ILocation>();
List <ILocation> occupiedLocations = new List <ILocation>();
try
{
for (int r = shipEndPosition.RowIndex; r >= battleshipPosition.RowIndex; r--)
{
for (int c = shipEndPosition.ColumnIndex; c >= battleshipPosition.ColumnIndex; c--)
{
ILocation foundLocation = GetLocationOnArrayBoard.GetLocation(board, new Position(r, c));
shipLocations.Add(foundLocation);
if (foundLocation.IsOccupied())
{
occupiedLocations.Add(foundLocation);
}
}
}
}
catch (LocationOffBoardException ex)
{
throw new ShipPlacedOffBoardException("Ship is not entirely on the board.", ex);
}
// if any of the Locations are already occupied, we cannot place the ship on the board
if (occupiedLocations.Count > 0)
{
ThrowOverlappingShipException(occupiedLocations);
}
// occupy each of the Locations where the ship belongs
foreach (ILocation locations in shipLocations)
{
locations.Occupy(battleship);
}
}