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UnityCsReference/Modules/GraphViewEditor/NodeAdapter.cs at master · drawcode/UnityCsReference · GitHub
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NodeAdapter.cs
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// Unity C# reference source
// Copyright (c) Unity Technologies. For terms of use, see
// https://unity3d.com/legal/licenses/Unity_Reference_Only_License
using
System
;
using
System
.
Collections
.
Generic
;
using
System
.
Linq
;
using
System
.
Reflection
;
using
System
.
Runtime
.
CompilerServices
;
using
UnityEngine
;
namespace
UnityEditor
.
Experimental
.
GraphView
{
// types of port to adapt
public
class
PortSource
<
T
>
{
}
// attribute to declare and adapter
public
class
TypeAdapter
:
Attribute
{
}
// TODO: This is a straight port from Canvas2D. I don't think that having to check for types in the assembly using reflection is the way we want to go.
public
class
NodeAdapter
{
private
static
List
<
MethodInfo
>
s_TypeAdapters
;
private
static
Dictionary
<
int
,
MethodInfo
>
s_NodeAdapterDictionary
;
public
bool
CanAdapt
(
object
a
,
object
b
)
{
if
(
a
==
b
)
return
false
;
// self connections are not permitted
if
(
a
==
null
||
b
==
null
)
return
false
;
MethodInfo
mi
=
GetAdapter
(
a
,
b
)
;
if
(
mi
==
null
)
{
Debug
.
Log
(
"adapter node not found for: "
+
a
.
GetType
(
)
+
" -> "
+
b
.
GetType
(
)
)
;
}
return
mi
!=
null
;
}
public
bool
Connect
(
object
a
,
object
b
)
{
MethodInfo
mi
=
GetAdapter
(
a
,
b
)
;
if
(
mi
==
null
)
{
Debug
.
LogError
(
"Attempt to connect 2 unadaptable types: "
+
a
.
GetType
(
)
+
" -> "
+
b
.
GetType
(
)
)
;
return
false
;
}
object
retVal
=
mi
.
Invoke
(
this
,
new
[
]
{
this
,
a
,
b
}
)
;
return
(
bool
)
retVal
;
}
IEnumerable
<
MethodInfo
>
GetExtensionMethods
(
Assembly
assembly
,
Type
extendedType
)
{
return
assembly
.
GetTypes
(
)
.
Where
(
t
=>
t
.
IsSealed
&&
!
t
.
IsGenericType
&&
!
t
.
IsNested
)
.
SelectMany
(
t
=>
t
.
GetMethods
(
BindingFlags
.
Static
|
BindingFlags
.
Public
|
BindingFlags
.
NonPublic
)
)
.
Where
(
m
=>
m
.
IsDefined
(
typeof
(
ExtensionAttribute
)
,
false
)
&&
m
.
GetParameters
(
)
[
0
]
.
ParameterType
==
extendedType
)
;
}
public
MethodInfo
GetAdapter
(
object
a
,
object
b
)
{
if
(
a
==
null
||
b
==
null
)
return
null
;
if
(
s_NodeAdapterDictionary
==
null
)
{
s_NodeAdapterDictionary
=
new
Dictionary
<
int
,
MethodInfo
>
(
)
;
// add extension methods
AppDomain
currentDomain
=
AppDomain
.
CurrentDomain
;
foreach
(
Assembly
assembly
in
currentDomain
.
GetAssemblies
(
)
)
{
IEnumerable
<
MethodInfo
>
methods
;
try
{
methods
=
GetExtensionMethods
(
assembly
,
typeof
(
NodeAdapter
)
)
;
}
// Invalid DLLs might raise this exception, simply ignore it
catch
(
ReflectionTypeLoadException
)
{
continue
;
}
foreach
(
MethodInfo
method
in
methods
)
{
ParameterInfo
[
]
methodParams
=
method
.
GetParameters
(
)
;
if
(
methodParams
.
Length
==
3
)
{
string
pa
=
methodParams
[
1
]
.
ParameterType
+
methodParams
[
2
]
.
ParameterType
.
ToString
(
)
;
int
hash
=
pa
.
GetHashCode
(
)
;
if
(
s_NodeAdapterDictionary
.
ContainsKey
(
hash
)
)
{
Debug
.
Log
(
"NodeAdapter: multiple extensions have the same signature:
\n
"
+
"1: "
+
method
+
"
\n
"
+
"2: "
+
s_NodeAdapterDictionary
[
hash
]
)
;
}
else
{
s_NodeAdapterDictionary
.
Add
(
hash
,
method
)
;
}
}
}
}
}
string
s
=
a
.
GetType
(
)
.
ToString
(
)
+
b
.
GetType
(
)
;
MethodInfo
methodInfo
;
return
s_NodeAdapterDictionary
.
TryGetValue
(
s
.
GetHashCode
(
)
,
out
methodInfo
)
?
methodInfo
:
null
;
}
public
MethodInfo
GetTypeAdapter
(
Type
from
,
Type
to
)
{
if
(
s_TypeAdapters
==
null
)
{
s_TypeAdapters
=
new
List
<
MethodInfo
>
(
)
;
AppDomain
currentDomain
=
AppDomain
.
CurrentDomain
;
foreach
(
Assembly
assembly
in
currentDomain
.
GetAssemblies
(
)
)
{
try
{
foreach
(
Type
temptype
in
assembly
.
GetTypes
(
)
)
{
MethodInfo
[
]
methodInfos
=
temptype
.
GetMethods
(
BindingFlags
.
Public
|
BindingFlags
.
Static
)
;
foreach
(
MethodInfo
i
in
methodInfos
)
{
object
[
]
allAttrs
=
i
.
GetCustomAttributes
(
typeof
(
TypeAdapter
)
,
false
)
;
if
(
allAttrs
.
Any
(
)
)
{
s_TypeAdapters
.
Add
(
i
)
;
}
}
}
}
// Invalid DLLs might raise this exception, simply ignore it
catch
(
ReflectionTypeLoadException
)
{
}
catch
(
Exception
ex
)
{
Debug
.
Log
(
ex
)
;
}
}
}
foreach
(
MethodInfo
i
in
s_TypeAdapters
)
{
if
(
i
.
ReturnType
==
to
)
{
ParameterInfo
[
]
allParams
=
i
.
GetParameters
(
)
;
if
(
allParams
.
Length
==
1
)
{
if
(
allParams
[
0
]
.
ParameterType
==
from
)
return
i
;
}
}
}
return
null
;
}
}
}
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