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pythonnet/src/runtime/Types/PropertyObject.cs at master · devtrack/pythonnet · GitHub
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PropertyObject.cs
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runtime
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Types
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PropertyObject.cs
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using
System
;
using
System
.
Reflection
;
using
System
.
Runtime
.
Serialization
;
namespace
Python
.
Runtime
{
using
MaybeMethodInfo
=
MaybeMethodBase
<
MethodInfo
>
;
/// <summary>
/// Implements a Python descriptor type that manages CLR properties.
/// </summary>
[
Serializable
]
internal
class
PropertyObject
:
ExtensionType
,
IDeserializationCallback
{
internal
MaybeMemberInfo
<
PropertyInfo
>
info
;
[
NonSerialized
]
private
MethodInfo
?
getter
;
[
NonSerialized
]
private
MethodInfo
?
setter
;
public
PropertyObject
(
PropertyInfo
md
)
{
info
=
new
MaybeMemberInfo
<
PropertyInfo
>
(
md
)
;
CacheAccessors
(
)
;
}
void
CacheAccessors
(
)
{
PropertyInfo
md
=
info
.
Value
;
getter
=
md
.
GetGetMethod
(
true
)
??
md
.
GetBaseGetMethod
(
true
)
;
setter
=
md
.
GetSetMethod
(
true
)
??
md
.
GetBaseSetMethod
(
true
)
;
}
/// <summary>
/// Descriptor __get__ implementation. This method returns the
/// value of the property on the given object. The returned value
/// is converted to an appropriately typed Python object.
/// </summary>
public
static
NewReference
tp_descr_get
(
BorrowedReference
ds
,
BorrowedReference
ob
,
BorrowedReference
tp
)
{
var
self
=
(
PropertyObject
)
GetManagedObject
(
ds
)
!
;
if
(
!
self
.
info
.
Valid
)
{
return
Exceptions
.
RaiseTypeError
(
self
.
info
.
DeletedMessage
)
;
}
var
info
=
self
.
info
.
Value
;
MethodInfo
?
getter
=
self
.
getter
;
object
result
;
if
(
getter
==
null
)
{
return
Exceptions
.
RaiseTypeError
(
"property cannot be read"
)
;
}
if
(
ob
==
null
||
ob
==
Runtime
.
PyNone
)
{
if
(
!
getter
.
IsStatic
)
{
return
new
NewReference
(
ds
)
;
}
try
{
result
=
info
.
GetValue
(
null
,
null
)
;
return
Converter
.
ToPython
(
result
,
info
.
PropertyType
)
;
}
catch
(
Exception
e
)
{
return
Exceptions
.
RaiseTypeError
(
e
.
Message
)
;
}
}
var
co
=
GetManagedObject
(
ob
)
as
CLRObject
;
if
(
co
==
null
)
{
return
Exceptions
.
RaiseTypeError
(
"invalid target"
)
;
}
try
{
result
=
getter
.
Invoke
(
co
.
inst
,
Array
.
Empty
<
object
>
(
)
)
;
return
Converter
.
ToPython
(
result
,
info
.
PropertyType
)
;
}
catch
(
Exception
e
)
{
if
(
e
.
InnerException
!=
null
)
{
e
=
e
.
InnerException
;
}
Exceptions
.
SetError
(
e
)
;
return
default
;
}
}
/// <summary>
/// Descriptor __set__ implementation. This method sets the value of
/// a property based on the given Python value. The Python value must
/// be convertible to the type of the property.
/// </summary>
public
static
int
tp_descr_set
(
BorrowedReference
ds
,
BorrowedReference
ob
,
BorrowedReference
val
)
{
var
self
=
(
PropertyObject
)
GetManagedObject
(
ds
)
!
;
if
(
!
self
.
info
.
Valid
)
{
Exceptions
.
RaiseTypeError
(
self
.
info
.
DeletedMessage
)
;
return
-
1
;
}
var
info
=
self
.
info
.
Value
;
MethodInfo
?
setter
=
self
.
setter
;
if
(
val
==
null
)
{
Exceptions
.
RaiseTypeError
(
"cannot delete property"
)
;
return
-
1
;
}
if
(
setter
==
null
)
{
Exceptions
.
RaiseTypeError
(
"property is read-only"
)
;
return
-
1
;
}
if
(
!
Converter
.
ToManaged
(
val
,
info
.
PropertyType
,
out
var
newval
,
true
)
)
{
return
-
1
;
}
bool
is_static
=
setter
.
IsStatic
;
if
(
ob
==
null
||
ob
==
Runtime
.
PyNone
)
{
if
(
!
is_static
)
{
Exceptions
.
RaiseTypeError
(
"instance property must be set on an instance"
)
;
return
-
1
;
}
}
try
{
if
(
!
is_static
)
{
var
co
=
GetManagedObject
(
ob
)
as
CLRObject
;
if
(
co
==
null
)
{
Exceptions
.
RaiseTypeError
(
"invalid target"
)
;
return
-
1
;
}
setter
.
Invoke
(
co
.
inst
,
new
object
?
[
]
{
newval
}
)
;
}
else
{
info
.
SetValue
(
null
,
newval
,
null
)
;
}
return
0
;
}
catch
(
Exception
e
)
{
if
(
e
.
InnerException
!=
null
)
{
e
=
e
.
InnerException
;
}
Exceptions
.
SetError
(
e
)
;
return
-
1
;
}
}
/// <summary>
/// Descriptor __repr__ implementation.
/// </summary>
public
static
NewReference
tp_repr
(
BorrowedReference
ob
)
{
var
self
=
(
PropertyObject
)
GetManagedObject
(
ob
)
!
;
return
Runtime
.
PyString_FromString
(
$
"<property '
{
self
.
info
}
'>"
)
;
}
void
IDeserializationCallback
.
OnDeserialization
(
object
sender
)
{
if
(
info
.
Valid
)
{
CacheAccessors
(
)
;
}
}
}
}
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