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pythonnet/src/runtime/fieldobject.cs at develop · achernet/pythonnet · GitHub
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runtime
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fieldobject.cs
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runtime
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fieldobject.cs
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// ==========================================================================
// This software is subject to the provisions of the Zope Public License,
// Version 2.0 (ZPL). A copy of the ZPL should accompany this distribution.
// THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
// WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
// FOR A PARTICULAR PURPOSE.
// ==========================================================================
using
System
;
using
System
.
Collections
;
using
System
.
Reflection
;
using
System
.
Runtime
.
InteropServices
;
namespace
Python
.
Runtime
{
//========================================================================
// Implements a Python descriptor type that provides access to CLR fields.
//========================================================================
internal
class
FieldObject
:
ExtensionType
{
FieldInfo
info
;
public
FieldObject
(
FieldInfo
info
)
:
base
(
)
{
this
.
info
=
info
;
}
//====================================================================
// Descriptor __get__ implementation. This method returns the
// value of the field on the given object. The returned value
// is converted to an appropriately typed Python object.
//====================================================================
public
static
IntPtr
tp_descr_get
(
IntPtr
ds
,
IntPtr
ob
,
IntPtr
tp
)
{
FieldObject
self
=
(
FieldObject
)
GetManagedObject
(
ds
)
;
Object
result
;
if
(
self
==
null
)
{
return
IntPtr
.
Zero
;
}
FieldInfo
info
=
self
.
info
;
if
(
(
ob
==
IntPtr
.
Zero
)
||
(
ob
==
Runtime
.
PyNone
)
)
{
if
(
!
info
.
IsStatic
)
{
Exceptions
.
SetError
(
Exceptions
.
TypeError
,
"instance attribute must be accessed "
+
"through a class instance"
)
;
return
IntPtr
.
Zero
;
}
try
{
result
=
info
.
GetValue
(
null
)
;
return
Converter
.
ToPython
(
result
,
info
.
FieldType
)
;
}
catch
(
Exception
e
)
{
Exceptions
.
SetError
(
Exceptions
.
TypeError
,
e
.
Message
)
;
return
IntPtr
.
Zero
;
}
}
try
{
CLRObject
co
=
(
CLRObject
)
GetManagedObject
(
ob
)
;
result
=
info
.
GetValue
(
co
.
inst
)
;
return
Converter
.
ToPython
(
result
,
info
.
FieldType
)
;
}
catch
(
Exception
e
)
{
Exceptions
.
SetError
(
Exceptions
.
TypeError
,
e
.
Message
)
;
return
IntPtr
.
Zero
;
}
}
//====================================================================
// Descriptor __set__ implementation. This method sets the value of
// a field based on the given Python value. The Python value must be
// convertible to the type of the field.
//====================================================================
public
static
new
int
tp_descr_set
(
IntPtr
ds
,
IntPtr
ob
,
IntPtr
val
)
{
FieldObject
self
=
(
FieldObject
)
GetManagedObject
(
ds
)
;
Object
newval
;
if
(
self
==
null
)
{
return
-
1
;
}
if
(
val
==
IntPtr
.
Zero
)
{
Exceptions
.
SetError
(
Exceptions
.
TypeError
,
"cannot delete field"
)
;
return
-
1
;
}
FieldInfo
info
=
self
.
info
;
if
(
info
.
IsLiteral
||
info
.
IsInitOnly
)
{
Exceptions
.
SetError
(
Exceptions
.
TypeError
,
"field is read-only"
)
;
return
-
1
;
}
bool
is_static
=
info
.
IsStatic
;
if
(
(
ob
==
IntPtr
.
Zero
)
||
(
ob
==
Runtime
.
PyNone
)
)
{
if
(
!
is_static
)
{
Exceptions
.
SetError
(
Exceptions
.
TypeError
,
"instance attribute must be set "
+
"through a class instance"
)
;
return
-
1
;
}
}
if
(
!
Converter
.
ToManaged
(
val
,
info
.
FieldType
,
out
newval
,
true
)
)
{
return
-
1
;
}
try
{
if
(
!
is_static
)
{
CLRObject
co
=
(
CLRObject
)
GetManagedObject
(
ob
)
;
info
.
SetValue
(
co
.
inst
,
newval
)
;
}
else
{
info
.
SetValue
(
null
,
newval
)
;
}
return
0
;
}
catch
(
Exception
e
)
{
Exceptions
.
SetError
(
Exceptions
.
TypeError
,
e
.
Message
)
;
return
-
1
;
}
}
//====================================================================
// Descriptor __repr__ implementation.
//====================================================================
public
static
IntPtr
tp_repr
(
IntPtr
ob
)
{
FieldObject
self
=
(
FieldObject
)
GetManagedObject
(
ob
)
;
string
s
=
String
.
Format
(
"<field '{0}'>"
,
self
.
info
.
Name
)
;
return
Runtime
.
PyString_FromStringAndSize
(
s
,
s
.
Length
)
;
}
}
}
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