public static SudokuBoard LoadFromFile(string a_fileName)
{
if (Path.GetExtension(a_fileName) == FileExtensions.ZipExt)
{
try
{
using (FileStream file_stream = new FileStream(a_fileName, FileMode.Open, FileAccess.Read))
{
using (GZipStream gzip_stream = new GZipStream(file_stream, CompressionMode.Decompress))
{
using (StreamReader stream_reader = new StreamReader(gzip_stream, Encoding.ASCII))
{
return(SudokuBoard.LoadFromXML(XElement.Load(stream_reader)));
}
}
}
}
catch
{
return(null);
}
}
else if (Path.GetExtension(a_fileName) == FileExtensions.XmlExt)
{
return(SudokuBoard.LoadFromXML(XElement.Load(a_fileName)));
}
else if (Path.GetExtension(a_fileName) == FileExtensions.TxtExt)
{
return(SudokuBoard.LoadFromTextFile(a_fileName));
}
else
{
return(null);
}
}
private static void LoadNodesFromXML(XElement a_element, SudokuSolutionNode a_parent)
{
a_element.Element("solution_nodes").Elements().ForEach(child_element =>
{
SudokuBoard board = SudokuBoard.LoadFromXML(child_element.Element("board"));
SudokuSolutionNode child_node = a_parent.AddNode(
board,
(SudokuSolutionNodeState)Enum.Parse(typeof(SudokuSolutionNodeState), child_element.Attribute("state").Value),
SudokuSolution.LoadFromXML(child_element.Element("solution"), board)
);
LoadNodesFromXML(child_element, child_node);
});
}
private static SudokuIntermediateSolution LoadFromXML(XElement a_element)
{
try
{
SudokuBoard before = SudokuBoard.LoadFromXML(a_element.Element("board_before"));
SudokuBoard after = SudokuBoard.LoadFromXML(a_element.Element("board_after"));
SudokuSolution solution = SudokuSolution.LoadFromXML(a_element.Element("solution"), before);
SudokuIntermediateSolution intermediate_solution = new SudokuIntermediateSolution(before, after, solution);
return(intermediate_solution);
}
catch
{
return(null);
}
}
private static SudokuSolutionNode LoadFromXML(XElement a_element)
{
try
{
SudokuSolutionNode node = SudokuSolutionNode.CreateRoot(SudokuBoard.LoadFromXML(a_element.Element("board")));
Debug.Assert(a_element.Element("solution").IsEmpty);
LoadNodesFromXML(a_element, node);
return(node);
}
catch
{
return(null);
}
}