private FunctionDescr Scan()
{
if (_info == null)
{
var info = new FunctionDescr();
var t = this.GetType();
var suffix = "Function";
info.name = t.Name.Substring(0, t.Name.Length - suffix.Length);
MethodInfo m = t.GetMethod("Execute", BindingFlags.Public | BindingFlags.Static | BindingFlags.Instance);
if (m == null)
{
throw new InvalidOperationException($"Missing Execute method");
}
info.retType = GetType(m.ReturnType);
info.paramTypes = Array.ConvertAll(m.GetParameters(), p => GetType(p.ParameterType));
info._method = m;
_info = info;
}
return(_info);
}
// Explicitly provide types.
// Necessary for Tables/Records
protected ReflectionFunction(string name, FormulaType returnType, params FormulaType[] paramTypes)
{
var t = this.GetType();
MethodInfo m = t.GetMethod("Execute", BindingFlags.Public | BindingFlags.Static | BindingFlags.Instance);
if (m == null)
{
throw new InvalidOperationException($"Missing Execute method");
}
_info = new FunctionDescr
{
name = name,
retType = returnType,
paramTypes = paramTypes,
_method = m
};
}
/// <summary>
/// Assume by defaults. Will reflect to get primitive types
/// </summary>
protected ReflectionFunction()
{
_info = null;
}
