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123 lines
4.7 KiB
123 lines
4.7 KiB
#Region "Microsoft.VisualBasic::9a4a157e09c3aeebcddba38b88055f15, XDRStream\EmitContexts\OrderModel.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 OrderModel
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'
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' Properties: Fields
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'
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' Function: BuildReader, BuildWriter, Create
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'
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' Sub: AppendField
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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.Linq
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Imports System.Reflection
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Imports System.Collections.Generic
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Imports System.Linq.Expressions
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Namespace Xdr.EmitContexts
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Public Class OrderModel
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Private _Fields As System.Collections.Generic.List(Of Xdr.EmitContexts.FieldDesc)
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Public Property Fields As List(Of FieldDesc)
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Get
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Return _Fields
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End Get
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Private Set(value As List(Of FieldDesc))
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_Fields = value
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End Set
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End Property
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Public Function BuildReader(targetType As Type) As [Delegate]
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Dim pReader = Expression.Parameter(GetType(Reader))
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Dim variables As List(Of ParameterExpression) = New List(Of ParameterExpression)()
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Dim body As List(Of Expression) = New List(Of Expression)()
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Dim resultVar = Expression.Variable(targetType, "result")
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variables.Add(resultVar)
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Dim assign = Expression.Assign(resultVar, Expression.[New](targetType))
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body.Add(assign)
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For Each fieldDesc In Fields
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body.Add(fieldDesc.BuildAssign(fieldDesc.BuildRead(pReader), resultVar))
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Next
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body.Add(resultVar)
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Dim block = Expression.Block(variables, body)
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Return Expression.Lambda(CType(GetType(ReadOneDelegate(Of)).MakeGenericType(targetType), Type), CType(block, Expression), pReader).Compile()
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End Function
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Public Function BuildWriter(targetType As Type) As [Delegate]
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Dim pWriter = Expression.Parameter(GetType(Writer))
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Dim pItem = Expression.Parameter(targetType)
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Dim variables As List(Of ParameterExpression) = New List(Of ParameterExpression)()
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Dim body As List(Of Expression) = New List(Of Expression)()
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For Each fieldDesc In Fields
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body.Add(fieldDesc.BuildWrite(pWriter, pItem))
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Next
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Dim block = Expression.Block(variables, body)
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Return Expression.Lambda(CType(GetType(WriteOneDelegate(Of)).MakeGenericType(targetType), Type), CType(block, Expression), CType(pWriter, ParameterExpression), CType(pItem, ParameterExpression)).Compile()
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End Function
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Public Shared Function Create(t As Type) As OrderModel
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Dim fields As SortedList(Of UInteger, FieldDesc) = New SortedList(Of UInteger, FieldDesc)()
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For Each f In t.GetFields().Where(Function(fi) fi.IsPublic AndAlso Not fi.IsStatic)
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AppendField(fields, f)
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Next
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For Each p In t.GetProperties().Where(Function(pi) pi.CanWrite AndAlso pi.CanRead)
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AppendField(fields, p)
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Next
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If fields.Count = 0 Then Return Nothing
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Dim result As OrderModel = New OrderModel()
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result.Fields = fields.Values.ToList()
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Return result
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End Function
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Private Shared Sub AppendField(fields As SortedList(Of UInteger, FieldDesc), mi As MemberInfo)
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Dim fAttr As OrderAttribute = mi.GetAttr(Of OrderAttribute)()
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If fAttr Is Nothing Then Return
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If fields.ContainsKey(fAttr.Order) Then Throw New InvalidOperationException("duplicate order " & fAttr.Order)
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fields.Add(fAttr.Order, New FieldDesc(mi))
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End Sub
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End Class
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End Namespace
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