// Create a new Code type for a particular heading
public static DataTypeCode Create(string name, DataHeading heading, TypeFlags flags, ConvertDelegate converter = null, DefaultDelegate defaulter = null)
{
var dt = new DataTypeCode {
Name = name,
Heading = heading,
Flags = flags,
};
dt.NativeType = TypeMaker.CreateType(dt);
return(dt);
}
// Get type from dictionary, or create and add
public static DataTypeTuple Get(DataHeading heading)
{
if (_headings.ContainsKey(heading))
{
return(_headings[heading]);
}
var dt = DataTypeTuple.Create("tuple", heading, TypeFlags.Variable | TypeFlags.Generated | TypeFlags.HasHeading);
dt.Ordinal = _headings.Count + 1;
dt.NativeType = TypeMaker.CreateType(dt);
_headings[heading] = dt;
return(dt);
}
// Get type from dictionary, or create and add
// Every relation needs a row type, so make sure they use the same heading
public static DataTypeRelation Get(DataHeading heading)
{
if (_headings.ContainsKey(heading))
{
return(_headings[heading]);
}
var tupletype = DataTypeTuple.Get(heading);
var dt = DataTypeRelation.Create("relation", tupletype.Heading, TypeFlags.Variable | TypeFlags.Generated | TypeFlags.HasHeading);
dt.Ordinal = _headings.Count + 1;
dt.ChildTupleType = tupletype;
dt.NativeType = TypeMaker.CreateType(dt);
_headings[heading] = dt;
var x = Activator.CreateInstance(dt.NativeType);
return(dt);
}