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pythonnet/src/runtime/interfaceobject.cs at master · ashsvis/pythonnet · GitHub
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interfaceobject.cs
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runtime
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interfaceobject.cs
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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>
[
Serializable
]
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
)
;
if
(
!
self
.
type
.
Valid
)
{
return
Exceptions
.
RaiseTypeError
(
self
.
type
.
DeletedMessage
)
;
}
var
nargs
=
Runtime
.
PyTuple_Size
(
args
)
;
Type
type
=
self
.
type
.
Value
;
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
self
.
WrapObject
(
obj
)
;
}
/// <summary>
/// Wrap the given object in an interface object, so that only methods
/// of the interface are available.
/// </summary>
public
IntPtr
WrapObject
(
object
impl
)
{
var
objPtr
=
CLRObject
.
GetInstHandle
(
impl
,
pyHandle
)
;
return
objPtr
;
}
/// <summary>
/// Expose the wrapped implementation through attributes in both
/// converted/encoded (__implementation__) and raw (__raw_implementation__) form.
/// </summary>
public
static
IntPtr
tp_getattro
(
IntPtr
ob
,
IntPtr
key
)
{
var
clrObj
=
(
CLRObject
)
GetManagedObject
(
ob
)
;
if
(
!
Runtime
.
PyString_Check
(
key
)
)
{
return
Exceptions
.
RaiseTypeError
(
"string expected"
)
;
}
string
name
=
Runtime
.
GetManagedString
(
key
)
;
if
(
name
==
"__implementation__"
)
{
return
Converter
.
ToPython
(
clrObj
.
inst
)
;
}
else
if
(
name
==
"__raw_implementation__"
)
{
return
CLRObject
.
GetInstHandle
(
clrObj
.
inst
)
;
}
return
Runtime
.
PyObject_GenericGetAttr
(
ob
,
key
)
;
}
}
}
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