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pythonnet/src/runtime/StateSerialization/MaybeMethodBase.cs at master · saroad2/pythonnet · GitHub
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MaybeMethodBase.cs
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runtime
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StateSerialization
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MaybeMethodBase.cs
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using
System
;
using
System
.
Reflection
;
using
System
.
Runtime
.
Serialization
;
using
System
.
Linq
;
namespace
Python
.
Runtime
{
[
Serializable
]
internal
struct
MaybeMethodBase
<
T
>
:
ISerializable
where
T
:
MethodBase
{
// .ToString() of the serialized object
const
string
SerializationName
=
"s"
;
// The ReflectedType of the object
const
string
SerializationType
=
"t"
;
// Fhe parameters of the MethodBase
const
string
SerializationParameters
=
"p"
;
const
string
SerializationIsCtor
=
"c"
;
const
string
SerializationMethodName
=
"n"
;
[
Serializable
]
struct
ParameterHelper
:
IEquatable
<
ParameterInfo
>
{
public
enum
TypeModifier
{
None
,
In
,
Out
,
Ref
}
public
readonly
string
Name
;
public
readonly
TypeModifier
Modifier
;
public
ParameterHelper
(
ParameterInfo
tp
)
{
Name
=
tp
.
ParameterType
.
AssemblyQualifiedName
;
Modifier
=
TypeModifier
.
None
;
if
(
tp
.
IsIn
&&
tp
.
ParameterType
.
IsByRef
)
{
Modifier
=
TypeModifier
.
In
;
}
else
if
(
tp
.
IsOut
&&
tp
.
ParameterType
.
IsByRef
)
{
Modifier
=
TypeModifier
.
Out
;
}
else
if
(
tp
.
ParameterType
.
IsByRef
)
{
Modifier
=
TypeModifier
.
Ref
;
}
}
public
bool
Equals
(
ParameterInfo
other
)
{
return
this
.
Equals
(
new
ParameterHelper
(
other
)
)
;
}
}
public
static
implicit
operator
MaybeMethodBase
<
T
>
(
T
ob
)
=>
new
MaybeMethodBase
<
T
>
(
ob
)
;
string
name
;
MethodBase
info
;
[
NonSerialized
]
Exception
deserializationException
;
public
string
DeletedMessage
{
get
{
return
$
"The .NET
{
typeof
(
T
)
}
{
name
}
no longer exists. Cause: "
+
deserializationException
?
.
Message
;
}
}
public
T
Value
{
get
{
if
(
info
==
null
)
{
throw
new
SerializationException
(
DeletedMessage
,
innerException
:
deserializationException
)
;
}
return
(
T
)
info
;
}
}
public
T
UnsafeValue
{
get
{
return
(
T
)
info
;
}
}
public
string
Name
{
get
{
return
name
;
}
}
public
bool
Valid
=>
info
!=
null
;
public
override
string
ToString
(
)
{
return
(
info
!=
null
?
info
.
ToString
(
)
:
$
"missing method info:
{
name
}
"
)
;
}
public
MaybeMethodBase
(
T
mi
)
{
info
=
mi
;
name
=
mi
?
.
ToString
(
)
;
deserializationException
=
null
;
}
internal
MaybeMethodBase
(
SerializationInfo
serializationInfo
,
StreamingContext
context
)
{
name
=
serializationInfo
.
GetString
(
SerializationName
)
;
info
=
null
;
deserializationException
=
null
;
try
{
// Retrieve the reflected type of the method;
var
typeName
=
serializationInfo
.
GetString
(
SerializationType
)
;
var
tp
=
Type
.
GetType
(
typeName
)
;
if
(
tp
==
null
)
{
throw
new
SerializationException
(
$
"The underlying type
{
typeName
}
can't be found"
)
;
}
// Get the method's parameters types
var
field_name
=
serializationInfo
.
GetString
(
SerializationMethodName
)
;
var
param
=
(
ParameterHelper
[
]
)
serializationInfo
.
GetValue
(
SerializationParameters
,
typeof
(
ParameterHelper
[
]
)
)
;
Type
[
]
types
=
new
Type
[
param
.
Length
]
;
bool
hasRefType
=
false
;
for
(
int
i
=
0
;
i
<
param
.
Length
;
i
++
)
{
var
paramTypeName
=
param
[
i
]
.
Name
;
types
[
i
]
=
Type
.
GetType
(
paramTypeName
)
;
if
(
types
[
i
]
==
null
)
{
throw
new
SerializationException
(
$
"The parameter of type
{
paramTypeName
}
can't be found"
)
;
}
else
if
(
types
[
i
]
.
IsByRef
)
{
hasRefType
=
true
;
}
}
MethodBase
mb
=
null
;
if
(
serializationInfo
.
GetBoolean
(
SerializationIsCtor
)
)
{
// We never want the static constructor.
mb
=
tp
.
GetConstructor
(
ClassManager
.
BindingFlags
&
(
~
BindingFlags
.
Static
)
,
binder
:
null
,
types
:
types
,
modifiers
:
null
)
;
}
else
{
mb
=
tp
.
GetMethod
(
field_name
,
ClassManager
.
BindingFlags
,
binder
:
null
,
types
:
types
,
modifiers
:
null
)
;
}
if
(
mb
!=
null
&&
hasRefType
)
{
mb
=
CheckRefTypes
(
mb
,
param
)
;
}
// Do like in ClassManager.GetClassInfo
if
(
mb
!=
null
&&
ClassManager
.
ShouldBindMethod
(
mb
)
)
{
info
=
mb
;
}
}
catch
(
Exception
e
)
{
deserializationException
=
e
;
}
}
MethodBase
CheckRefTypes
(
MethodBase
mb
,
ParameterHelper
[
]
ph
)
{
// One more step: Changing:
// void MyFn (ref int a)
// to:
// void MyFn (out int a)
// will still find the function correctly as, `in`, `out` and `ref`
// are all represented as a reference type. Query the method we got
// and validate the parameters
if
(
ph
.
Length
!=
0
)
{
foreach
(
var
item
in
Enumerable
.
Zip
(
ph
,
mb
.
GetParameters
(
)
,
(
orig
,
current
)
=>
new
{
orig
,
current
}
)
)
{
if
(
!
item
.
current
.
Equals
(
item
.
orig
)
)
{
// False positive
return
null
;
}
}
}
return
mb
;
}
public
void
GetObjectData
(
SerializationInfo
serializationInfo
,
StreamingContext
context
)
{
serializationInfo
.
AddValue
(
SerializationName
,
name
)
;
if
(
Valid
)
{
serializationInfo
.
AddValue
(
SerializationMethodName
,
info
.
Name
)
;
serializationInfo
.
AddValue
(
SerializationType
,
info
.
ReflectedType
.
AssemblyQualifiedName
)
;
ParameterHelper
[
]
parameters
=
(
from
p
in
info
.
GetParameters
(
)
select
new
ParameterHelper
(
p
)
)
.
ToArray
(
)
;
serializationInfo
.
AddValue
(
SerializationParameters
,
parameters
,
typeof
(
ParameterHelper
[
]
)
)
;
serializationInfo
.
AddValue
(
SerializationIsCtor
,
info
.
IsConstructor
)
;
}
}
}
}
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