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93 lines
3.5 KiB
93 lines
3.5 KiB
#Region "Microsoft.VisualBasic::693eb2a3a9132d4165de7d98fd907131, XDRStream\EnumHelper.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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' Class EnumHelper
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'
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' Constructor: (+1 Overloads) Sub New
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' Function: EnumToInt, IntToEnum
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'
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'
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' /********************************************************************************/
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#End Region
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Namespace Xdr
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Public Class EnumHelper(Of T As Structure)
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Private Shared ReadOnly _enumMap As Dictionary(Of T, Integer)
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Private Shared ReadOnly _intMap As Dictionary(Of Integer, T)
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Shared Sub New()
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Dim underType As Type = GetType(T).GetEnumUnderlyingType()
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Dim conv As Func(Of T, Integer)
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If underType Is GetType(Byte) Then
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conv = Function(item) CByte(CType(item, ValueType))
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ElseIf underType Is GetType(SByte) Then
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conv = Function(item) CSByte(CType(item, ValueType))
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ElseIf underType Is GetType(Short) Then
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conv = Function(item) CShort(CType(item, ValueType))
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ElseIf underType Is GetType(UShort) Then
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conv = Function(item) CUShort(CType(item, ValueType))
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ElseIf underType Is GetType(Integer) Then
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conv = Function(item) CType(item, ValueType)
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Else
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Throw New NotSupportedException(String.Format("unsupported type {0}", GetType(T).FullName))
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End If
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_intMap = New Dictionary(Of Integer, T)()
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_enumMap = New Dictionary(Of T, Integer)()
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For Each item In [Enum].GetValues(GetType(T)).Cast(Of T)()
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Dim exist As T = Nothing
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Dim key = conv(item)
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If Not _intMap.TryGetValue(key, exist) Then _intMap.Add(key, item)
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If Not _enumMap.TryGetValue(item, key) Then _enumMap.Add(item, conv(item))
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Next
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End Sub
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Public Shared Function IntToEnum(val As Integer) As T
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Dim exist As T = Nothing
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If _intMap.TryGetValue(val, exist) Then Return exist
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Throw New InvalidCastException(String.Format("type `{0}' not contain {1}", GetType(T).FullName, val))
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End Function
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Public Shared Function EnumToInt(item As T) As Integer
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Dim val As Integer
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If _enumMap.TryGetValue(item, val) Then Return val
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Throw New InvalidCastException(String.Format("enum {0} not contain value {1}", GetType(T).FullName, item))
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End Function
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End Class
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End Namespace
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