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67 lines
2.4 KiB
67 lines
2.4 KiB
Imports Microsoft.VisualBasic.ComputingServices.TaskHost
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Imports Microsoft.VisualBasic.Linq.Framework.DynamicCode
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Imports Microsoft.VisualBasic.Linq.Framework.Provider
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Imports Microsoft.VisualBasic.Linq.Framework.Provider.ImportsAPI
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Imports Microsoft.VisualBasic.Linq.LDM.Statements.Tokens
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Imports Microsoft.VisualBasic.Linq.LDM.Statements.Tokens.WhereClosure
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Imports Microsoft.VisualBasic.Scripting
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Namespace StorageTek
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''' <summary>
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''' 实体对象，实际上这个模块最主要的功能就是提供数据源的读取方法
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''' </summary>
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Public Class EntityProvider : Inherits TypeEntry
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''' <summary>
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''' 存储的方法
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''' </summary>
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''' <returns></returns>
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Public Property Tek As StorageTeks
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''' <summary>
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''' 映射的实际的存储位置
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''' </summary>
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''' <returns></returns>
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Public Property MapFileIO As String
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Sub New()
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End Sub
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Sub New(Linq As TypeEntry, res As String)
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Call MyBase.New(Linq)
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Tek = StorageTeks.Linq
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MapFileIO = res
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End Sub
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Public Function GetRepository() As IEnumerable
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If Tek = StorageTeks.Linq Then ' 使用的是Linq数据源
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Dim hwnd As GetLinqResource = Me.GetHandle
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Return hwnd(MapFileIO)
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Else
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Return __internalRepository()
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End If
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End Function
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''' <summary>
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''' 系统的自有的数据源方法
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''' </summary>
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''' <returns></returns>
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Private Function __internalRepository() As IEnumerable
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Dim api As IRepository = StorageTek.API.InternalAPIs(Tek) ' 在这里是系统的自有的数据源方法
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Dim type As Type = Me.TypeId.GetType ' 得到元素类型的信息
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Dim source As IEnumerable = api(MapFileIO, type)
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Return source
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End Function
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Public Overrides Function ToString() As String
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Return $"[{Tek.ToString}] {MapFileIO} //{MyBase.ToString}"
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End Function
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Public Function LinqWhere(where As String, compiler As DynamicCompiler) As IEnumerable
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Dim type As Type = Me.GetType
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Dim test As ITest = WhereClosure.CreateLinqWhere(where, type, compiler)
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Dim LQuery = (From x As Object In GetRepository() Where True = test(x) Select x)
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Return LQuery
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End Function
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End Class
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End Namespace |