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90 lines
3.1 KiB
C#
90 lines
3.1 KiB
C#
// ==========================================================================
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// This software is subject to the provisions of the Zope Public License,
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// Version 2.0 (ZPL). A copy of the ZPL should accompany this distribution.
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// THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
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// WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
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// FOR A PARTICULAR PURPOSE.
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// ==========================================================================
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using System;
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using System.Reflection;
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using System.Runtime.InteropServices;
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namespace Python.Runtime {
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/// <summary>
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/// Provides the implementation for reflected interface types. Managed
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/// interfaces are represented in Python by actual Python type objects.
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/// Each of those type objects is associated with an instance of this
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/// class, which provides the implementation for the Python type.
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/// </summary>
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internal class InterfaceObject : ClassBase {
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internal ConstructorInfo ctor;
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internal InterfaceObject(Type tp) : base(tp) {
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CoClassAttribute coclass = (CoClassAttribute)
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Attribute.GetCustomAttribute(tp, cc_attr);
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if (coclass != null) {
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ctor = coclass.CoClass.GetConstructor(Type.EmptyTypes);
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}
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}
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static Type cc_attr;
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static InterfaceObject() {
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cc_attr = typeof(CoClassAttribute);
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}
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//====================================================================
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// Implements __new__ for reflected interface types.
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//====================================================================
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public static IntPtr tp_new(IntPtr tp, IntPtr args, IntPtr kw) {
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InterfaceObject self = (InterfaceObject)GetManagedObject(tp);
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int nargs = Runtime.PyTuple_Size(args);
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Type type = self.type;
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Object obj;
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if (nargs == 1) {
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IntPtr inst = Runtime.PyTuple_GetItem(args, 0);
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CLRObject co = GetManagedObject(inst) as CLRObject;
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if ((co == null) || (!type.IsInstanceOfType(co.inst))) {
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string msg = "object does not implement " + type.Name;
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Exceptions.SetError(Exceptions.TypeError, msg);
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return IntPtr.Zero;
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}
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obj = co.inst;
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}
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else if ((nargs == 0) && (self.ctor != null)) {
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obj = self.ctor.Invoke(null);
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if (obj == null || !type.IsInstanceOfType(obj)) {
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Exceptions.SetError(Exceptions.TypeError,
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"CoClass default constructor failed"
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);
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return IntPtr.Zero;
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}
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}
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else {
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Exceptions.SetError(Exceptions.TypeError,
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"interface takes exactly one argument"
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);
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return IntPtr.Zero;
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}
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return CLRObject.GetInstHandle(obj, self.pyHandle);
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}
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}
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}
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