static Engine()
{
DirectoryInfo rundir = new FileInfo(Assembly.GetExecutingAssembly().Location).Directory;
List<Engine> engines = new List<Engine>();
foreach(FileInfo fi in rundir.GetFiles("*.dll")) {
try {
Assembly assy = Assembly.LoadFrom(fi.FullName);
foreach(Type t in assy.GetExportedTypes()) {
if(!t.IsAbstract && typeof(Engine).IsAssignableFrom(t)) {
Engine e = (Engine) Activator.CreateInstance(t);
if(e.Exists) engines.Add(e);
}
}
} catch (BadImageFormatException) {
// do nothing. The dll isn't in the right format, so we'll ignore it.
} catch (FileLoadException) {
// do nothing. We tried to load the same assembly twice or the assembly name was longer than MAX_PATH characters.
// In either case, we can't do anything with it.
} catch (System.Reflection.ReflectionTypeLoadException) {
// ignore ReflectionTypeLoadException
} catch (TypeLoadException) {
// ignore
} catch (Exception e) {
throw new ApplicationException("Could not load math engine plugin " + fi.Name + ":\n\n" + e.Message, e);
}
}
engines.Sort(delegate(Engine a, Engine b) { return a.Name.CompareTo(b.Name); });
_engines = engines.ToArray();
Trace.Assert(_engines.Length > 0);
int ix = 0;
for(int i = 0; i < _engines.Length; i++) {
if (_engines[i] is BuiltInEngine) {
//if(_engines[i] is MMAEngine) {
ix = i;
break;
}
}
_current = _engines[ix];
}
private static void PushEngine(Engine e)
{
_engineStack.Push(_current);
_current = e;
_current.Activate();
}
private static void PopEngine()
{
if(_engineStack.Count != 0) {
_current.Deactivate();
_current = _engineStack.Pop();
}
}
