/// <summary>
/// This method will return the list of cells that meet the specification.
/// <param name="cell"> source cell, whose neighbours need to find </param>
/// <param name="specification">Actual specification, which need to pass by neighbours. </param>
/// <returns>return the cell collection which pass the specification. </returns>
public ICollection<Cell> FindNeighbourCells(Cell cell, ISpecification<Cell> specification)
{
if(cell == null)
throw new ArgumentNullException("Cell can't be empty");
List<Cell> cells = new List<Cell>();
int startRow;
int startCol;
int endRow;
int endCol;
int colIndex = cell.ColNumber;
int rowIndex = cell.RowNumber;
GetValidStartRowAndCol(rowIndex, colIndex, out startRow, out startCol);
GetValidEndRowAndCol(rowIndex, colIndex, out endRow, out endCol);
for (int xcoord = startRow; xcoord <= endRow; xcoord++)
{
for (int ycoord = startCol; ycoord <= endCol; ycoord++)
{
if (!(xcoord == rowIndex && ycoord == colIndex))
{
if (specification == null)
cells.Add(grid[xcoord, ycoord]);
else
if (specification.IsSpecificationMeet(grid[xcoord, ycoord]))
cells.Add(grid[xcoord, ycoord]);
}
}
}
return cells;
}