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104 lines
3.6 KiB
104 lines
3.6 KiB
Imports Microsoft.VisualBasic.Serialization.JSON
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Imports Microsoft.VisualBasic.RQL.Linq
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Namespace API
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''' <summary>
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''' RQL Client API.
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''' </summary>
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''' <remarks>
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''' 数据对象在申明创建之后并没有立即执行，而是在调用迭代器之后才会执行查询
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''' </remarks>
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Public Class Repository(Of T)
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Implements IDisposable
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Implements IEnumerable(Of T)
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Public ReadOnly Property Repository As String
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''' <summary>
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'''
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''' </summary>
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''' <param name="source">
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''' URL, examples as: http://Linq.gcmodeller.org/kegg/ssdb
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'''
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''' Where, the remote server http://Linq.gcmodeller.org implements the RQL services.
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''' And the repository resource name on the server is "/kegg/ssdb"
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''' </param>
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Sub New(source As String)
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Repository = source
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End Sub
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Public Overrides Function ToString() As String
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Return Repository
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End Function
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''' <summary>
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''' 在这里会打开一个新的查询
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''' </summary>
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''' <param name="assertions">断言</param>
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''' <returns></returns>
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Public Function Where(assertions As String) As LinqEntry
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Return __innerQuery(Repository & "?where=" & assertions)
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End Function
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Public Function Where(predication As Func(Of T, Boolean)) As LinqEntry
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End Function
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Private Shared Function __innerQuery(url As String) As LinqEntry
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Dim source As String = url.GetRequest
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Dim linq As LinqEntry = source.LoadObject(Of LinqEntry)
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Return linq
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End Function
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#Region "Implements IEnumerable(Of T)"
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Public Iterator Function GetEnumerator() As IEnumerator(Of T) Implements IEnumerable(Of T).GetEnumerator
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For Each x As T In __innerQuery(Repository).AsLinq(Of T)
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If Not disposedValue Then
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Yield x
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Else
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Exit For
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End If
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Next
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End Function
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Private Iterator Function IEnumerable_GetEnumerator() As IEnumerator Implements IEnumerable.GetEnumerator
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Yield GetEnumerator()
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End Function
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#End Region
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#Region "IDisposable Support"
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Private disposedValue As Boolean ' To detect redundant calls
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' IDisposable
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Protected Overridable Sub Dispose(disposing As Boolean)
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If Not Me.disposedValue Then
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If disposing Then
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' TODO: dispose managed state (managed objects).
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End If
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' TODO: free unmanaged resources (unmanaged objects) and override Finalize() below.
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' TODO: set large fields to null.
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End If
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Me.disposedValue = True
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End Sub
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' TODO: override Finalize() only if Dispose(disposing As Boolean) above has code to free unmanaged resources.
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'Protected Overrides Sub Finalize()
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' ' Do not change this code. Put cleanup code in Dispose(disposing As Boolean) above.
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' Dispose(False)
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' MyBase.Finalize()
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'End Sub
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' This code added by Visual Basic to correctly implement the disposable pattern.
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Public Sub Dispose() Implements IDisposable.Dispose
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' Do not change this code. Put cleanup code in Dispose(disposing As Boolean) above.
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Dispose(True)
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' TODO: uncomment the following line if Finalize() is overridden above.
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' GC.SuppressFinalize(Me)
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End Sub
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#End Region
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End Class
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End Namespace
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