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133 lines
5.2 KiB
133 lines
5.2 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.Collections.Generic
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Imports System.Collections.ObjectModel
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Namespace Google.Protobuf.Reflection
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''' <summary>
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''' Describes a "oneof" field collection in a message type: a set of
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''' fields of which at most one can be set in any particular message.
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''' </summary>
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Public NotInheritable Class OneofDescriptor
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Inherits DescriptorBase
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Private ReadOnly proto As OneofDescriptorProto
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Private containingTypeField As MessageDescriptor
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Private fieldsField As IList(Of FieldDescriptor)
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Private ReadOnly accessorField As OneofAccessor
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Friend Sub New(proto As OneofDescriptorProto, file As FileDescriptor, parent As MessageDescriptor, index As Integer, clrName As String)
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MyBase.New(file, file.ComputeFullName(parent, proto.Name), index)
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Me.proto = proto
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containingTypeField = parent
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file.DescriptorPool.AddSymbol(Me)
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accessorField = CreateAccessor(clrName)
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End Sub
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''' <summary>
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''' The brief name of the descriptor's target.
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''' </summary>
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Public Overrides ReadOnly Property Name As String
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Get
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Return proto.Name
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End Get
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End Property
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''' <summary>
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''' Gets the message type containing this oneof.
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''' </summary>
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''' <value>
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''' The message type containing this oneof.
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''' </value>
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Public ReadOnly Property ContainingType As MessageDescriptor
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Get
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Return containingTypeField
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End Get
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End Property
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''' <summary>
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''' Gets the fields within this oneof, in declaration order.
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''' </summary>
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''' <value>
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''' The fields within this oneof, in declaration order.
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''' </value>
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Public ReadOnly Property Fields As IList(Of FieldDescriptor)
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Get
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Return fieldsField
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End Get
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End Property
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''' <summary>
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''' Gets an accessor for reflective access to the values associated with the oneof
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''' in a particular message.
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''' </summary>
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''' <value>
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''' The accessor used for reflective access.
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''' </value>
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Public ReadOnly Property Accessor As OneofAccessor
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Get
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Return accessorField
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End Get
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End Property
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Friend Sub CrossLink()
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Dim fieldCollection As List(Of FieldDescriptor) = New List(Of FieldDescriptor)()
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For Each field In ContainingType.Fields.InDeclarationOrder()
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If field.ContainingOneof Is Me Then
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fieldCollection.Add(field)
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End If
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Next
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fieldsField = New ReadOnlyCollection(Of FieldDescriptor)(fieldCollection)
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End Sub
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Private Function CreateAccessor(clrName As String) As OneofAccessor
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Dim caseProperty = containingTypeField.ClrType.GetProperty(clrName & "Case")
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If caseProperty Is Nothing Then
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Throw New DescriptorValidationException(Me, $"Property {clrName}Case not found in {containingTypeField.ClrType}")
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End If
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Dim clearMethod = containingTypeField.ClrType.GetMethod("Clear" & clrName)
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If clearMethod Is Nothing Then
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Throw New DescriptorValidationException(Me, $"Method Clear{clrName} not found in {containingTypeField.ClrType}")
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End If
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Return New OneofAccessor(caseProperty, clearMethod, Me)
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End Function
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End Class
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End Namespace
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