private static ModelSystem?Load(Stream rawStream, ModuleRepository modules, ModelSystemHeader modelSystemHeader, ref string?error)
{
try
{
var modelSystem = new ModelSystem(modelSystemHeader);
using var stream = new MemoryStream();
rawStream.CopyTo(stream);
var reader = new Utf8JsonReader(stream.GetBuffer().AsSpan());
var typeLookup = new Dictionary <int, Type>();
var nodes = new Dictionary <int, Node>();
while (reader.Read())
{
if (reader.TokenType == JsonTokenType.PropertyName)
{
if (reader.ValueTextEquals(TypesProperty))
{
if (!LoadTypes(typeLookup, ref reader, ref error))
{
return(null);
}
}
else if (reader.ValueTextEquals(BoundariesProperty))
{
if (!LoadBoundaries(modules, typeLookup, nodes, ref reader, modelSystem.GlobalBoundary, ref error))
{
return(null);
}
break;
}
else
{
error = $"Unknown token found '{reader.GetString()}'";
return(null);
}
}
}
return(modelSystem);
}
catch (JsonException e)
{
error = e.Message;
}
catch (IOException e)
{
error = e.Message;
}
return(null);
}
internal static bool Load(ProjectSession session, ModelSystemHeader modelSystemHeader, out ModelSystemSession?msSession, out CommandError?error)
{
// the parameters are have already been vetted
var path = modelSystemHeader.ModelSystemPath;
var info = new FileInfo(path);
string?errorString = null;
error = null;
try
{
ModelSystem?ms;
if (info.Exists)
{
using var rawStream = File.OpenRead(modelSystemHeader.ModelSystemPath);
ms = Load(rawStream, session.GetModuleRepository(), modelSystemHeader, ref errorString);
}
else
{
ms = new ModelSystem(modelSystemHeader);
}
if (ms == null)
{
msSession = null;
// Give a generic error message if one was not already supplied.
error = new CommandError(errorString ?? "Unable to create a model system session for the given header.");
return(false);
}
msSession = new ModelSystemSession(session, ms);
error = null;
return(true);
}
catch (IOException e)
{
error = new CommandError(e.Message);
msSession = null;
return(false);
}
}