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110 lines
5.1 KiB
110 lines
5.1 KiB
#Region "Copyright notice and license"
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' Protocol Buffers - Google's data interchange format
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' Copyright 2015 Google Inc. All rights reserved.
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' https://developers.google.com/protocol-buffers/
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'
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' Redistribution and use in source and binary forms, with or without
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' modification, are permitted provided that the following conditions are
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' met:
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'
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' * Redistributions of source code must retain the above copyright
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' notice, this list of conditions and the following disclaimer.
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' * Redistributions in binary form must reproduce the above
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' copyright notice, this list of conditions and the following disclaimer
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' in the documentation and/or other materials provided with the
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' distribution.
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' * Neither the name of Google Inc. nor the names of its
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' contributors may be used to endorse or promote products derived from
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' this software without specific prior written permission.
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'
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' THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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' "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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' LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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' A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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' OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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' SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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' LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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' DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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' THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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' (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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' OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#End Region
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Imports System.Reflection
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Imports System.Runtime.CompilerServices
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#If Not DOTNET35 Then
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Namespace Google.Protobuf.Compatibility
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''' <summary>
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''' Provides extension methods on Type that just proxy to TypeInfo.
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''' These are used to support the new type system from .NET 4.5, without
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''' having calls to GetTypeInfo all over the place. While the methods here are meant to be
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''' broadly compatible with the desktop framework, there are some subtle differences in behaviour - but
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''' they're not expected to affect our use cases. While the class is internal, that should be fine: we can
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''' evaluate each new use appropriately.
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''' </summary>
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Friend Module TypeExtensions
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''' <summary>
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''' See https://msdn.microsoft.com/en-us/library/system.type.isassignablefrom
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''' </summary>
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<Extension()>
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Friend Function IsAssignableFrom(target As Type, c As Type) As Boolean
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Return target.GetTypeInfo().IsAssignableFrom(c.GetTypeInfo())
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End Function
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''' <summary>
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''' Returns a representation of the public property associated with the given name in the given type,
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''' including inherited properties or null if there is no such public property.
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''' Here, "public property" means a property where either the getter, or the setter, or both, is public.
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''' </summary>
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<Extension()>
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Friend Function GetProperty(target As Type, name As String) As PropertyInfo
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' GetDeclaredProperty only returns properties declared in the given type, so we need to recurse.
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While target IsNot Nothing
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Dim typeInfo = target.GetTypeInfo()
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Dim ret = typeInfo.GetDeclaredProperty(name)
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If ret IsNot Nothing AndAlso (ret.CanRead AndAlso ret.GetMethod.IsPublic OrElse ret.CanWrite AndAlso ret.SetMethod.IsPublic) Then
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Return ret
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End If
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target = typeInfo.BaseType
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End While
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Return Nothing
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End Function
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''' <summary>
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''' Returns a representation of the public method associated with the given name in the given type,
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''' including inherited methods.
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''' </summary>
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''' <remarks>
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''' This has a few differences compared with Type.GetMethod in the desktop framework. It will throw
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''' if there is an ambiguous match even between a private method and a public one, but it *won't* throw
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''' if there are two overloads at different levels in the type hierarchy (e.g. class Base declares public void Foo(int) and
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''' class Child : Base declares public void Foo(long)).
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''' </remarks>
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''' <exception cref="AmbiguousMatchException">One type in the hierarchy declared more than one method with the same name</exception>
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<Extension()>
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Friend Function GetMethod(target As Type, name As String) As MethodInfo
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' GetDeclaredMethod only returns methods declared in the given type, so we need to recurse.
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While target IsNot Nothing
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Dim typeInfo = target.GetTypeInfo()
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Dim ret = typeInfo.GetDeclaredMethod(name)
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If ret IsNot Nothing AndAlso ret.IsPublic Then
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Return ret
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End If
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target = typeInfo.BaseType
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End While
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Return Nothing
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End Function
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End Module
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End Namespace
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#End If
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