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86 lines
3.0 KiB
86 lines
3.0 KiB
#Region "Microsoft.VisualBasic::2f151b3ffd00dcc8fdb8a017dd0a15ba, Data\BinaryData\BinaryData\XDR\TypeExtensions.vb"
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' Author:
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'
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' asuka (amethyst.asuka@gcmodeller.org)
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' xie (genetics@smrucc.org)
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' xieguigang (xie.guigang@live.com)
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'
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' Copyright (c) 2018 GPL3 Licensed
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'
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'
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' GNU GENERAL PUBLIC LICENSE (GPL3)
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'
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'
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' This program is free software: you can redistribute it and/or modify
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' it under the terms of the GNU General Public License as published by
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' the Free Software Foundation, either version 3 of the License, or
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' (at your option) any later version.
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'
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' This program is distributed in the hope that it will be useful,
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' but WITHOUT ANY WARRANTY; without even the implied warranty of
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' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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' GNU General Public License for more details.
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'
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' You should have received a copy of the GNU General Public License
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' along with this program. If not, see <http://www.gnu.org/licenses/>.
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' /********************************************************************************/
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' Summaries:
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' Module TypeExtensions
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'
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' Function: ArraySubType, GetAttr, GetAttrs, ListSubType, NullableSubType
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'
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'
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' /********************************************************************************/
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#End Region
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Imports System
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Imports System.Collections.Generic
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Imports System.Linq
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Imports System.Reflection
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Imports System.Runtime.CompilerServices
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Namespace Xdr
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Public Module TypeExtensions
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<Extension()>
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Public Function GetAttr(Of T As Attribute)(mi As MemberInfo) As T
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Return TryCast(mi.GetCustomAttributes(GetType(T), True).FirstOrDefault(), T)
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End Function
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<Extension()>
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Public Function GetAttrs(Of T As Attribute)(mi As MemberInfo) As IEnumerable(Of T)
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Return mi.GetCustomAttributes(GetType(T), True).Cast(Of T)()
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End Function
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<Extension()>
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Public Function NullableSubType(type As Type) As Type
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If Not type.IsGenericType Then Return Nothing
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If type.GetGenericTypeDefinition() IsNot GetType(Nullable(Of)) Then Return Nothing
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Return type.GetGenericArguments()(0)
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End Function
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<Extension()>
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Public Function ArraySubType(type As Type) As Type
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If Not type.HasElementType Then Return Nothing
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Dim itemType As Type = type.GetElementType()
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If itemType Is Nothing OrElse itemType.MakeArrayType() IsNot type Then Return Nothing
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Return itemType
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End Function
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<Extension()>
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Public Function ListSubType(type As Type) As Type
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If Not type.IsGenericType Then Return Nothing
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Dim genericType As Type = type.GetGenericTypeDefinition()
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If genericType IsNot GetType(List(Of)) Then Return Nothing
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Return type.GetGenericArguments()(0)
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End Function
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End Module
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End Namespace
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