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interfaceobject.cs
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77 lines (65 loc) · 2.37 KB
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using System;
using System.Reflection;
using System.Runtime.InteropServices;
namespace Python.Runtime
{
/// <summary>
/// Provides the implementation for reflected interface types. Managed
/// interfaces are represented in Python by actual Python type objects.
/// Each of those type objects is associated with an instance of this
/// class, which provides the implementation for the Python type.
/// </summary>
internal class InterfaceObject : ClassBase
{
internal ConstructorInfo ctor;
internal InterfaceObject(Type tp) : base(tp)
{
var coclass = (CoClassAttribute)Attribute.GetCustomAttribute(tp, cc_attr);
if (coclass != null)
{
ctor = coclass.CoClass.GetConstructor(Type.EmptyTypes);
}
}
private static Type cc_attr;
static InterfaceObject()
{
cc_attr = typeof(CoClassAttribute);
}
/// <summary>
/// Implements __new__ for reflected interface types.
/// </summary>
public static IntPtr tp_new(IntPtr tp, IntPtr args, IntPtr kw)
{
var self = (InterfaceObject)GetManagedObject(tp);
var nargs = Runtime.PyTuple_Size(args);
Type type = self.type;
object obj;
if (nargs == 1)
{
IntPtr inst = Runtime.PyTuple_GetItem(args, 0);
var co = GetManagedObject(inst) as CLRObject;
if (co == null || !type.IsInstanceOfType(co.inst))
{
Exceptions.SetError(Exceptions.TypeError, $"object does not implement {type.Name}");
return IntPtr.Zero;
}
obj = co.inst;
}
else if (nargs == 0 && self.ctor != null)
{
obj = self.ctor.Invoke(null);
if (obj == null || !type.IsInstanceOfType(obj))
{
Exceptions.SetError(Exceptions.TypeError, "CoClass default constructor failed");
return IntPtr.Zero;
}
}
else
{
Exceptions.SetError(Exceptions.TypeError, "interface takes exactly one argument");
return IntPtr.Zero;
}
return CLRObject.GetInstHandle(obj, self.pyHandle);
}
}
}