#Region "Microsoft.VisualBasic::36588f403fe091d67737baddedfd90de, ..\sciBASIC.ComputingServices\RQL\StorageTek\API.vb"

    ' Author:
    ' 
    '       asuka (amethyst.asuka@gcmodeller.org)
    '       xieguigang (xie.guigang@live.com)
    '       xie (genetics@smrucc.org)
    ' 
    ' Copyright (c) 2016 GPL3 Licensed
    ' 
    ' 
    ' GNU GENERAL PUBLIC LICENSE (GPL3)
    ' 
    ' This program is free software: you can redistribute it and/or modify
    ' it under the terms of the GNU General Public License as published by
    ' the Free Software Foundation, either version 3 of the License, or
    ' (at your option) any later version.
    ' 
    ' This program is distributed in the hope that it will be useful,
    ' but WITHOUT ANY WARRANTY; without even the implied warranty of
    ' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    ' GNU General Public License for more details.
    ' 
    ' You should have received a copy of the GNU General Public License
    ' along with this program. If not, see <http://www.gnu.org/licenses/>.

#End Region

Imports Microsoft.VisualBasic.Serialization.JSON.JsonContract
Imports Microsoft.VisualBasic

Namespace StorageTek

    ''' <summary>
    ''' 系统自有的存储API
    ''' </summary>
    Public Module API

        ''' <summary>
        ''' 系统自带的存储API
        ''' </summary>
        ''' <returns></returns>
        Public ReadOnly Property InternalAPIs As Dictionary(Of StorageTeks, IRepository)

        Sub New()
            InternalAPIs = New Dictionary(Of StorageTeks, IRepository) From {
 _
                {StorageTeks.Json, AddressOf JsonList},
                {StorageTeks.Xml, AddressOf XmlList},
                {StorageTeks.DIR Or StorageTeks.Json, AddressOf DIRJson},
                {StorageTeks.DIR Or StorageTeks.Xml, AddressOf DIRXml}
            }
        End Sub

        ''' <summary>
        ''' 
        ''' </summary>
        ''' <param name="url"></param>
        ''' <param name="type">单个元素的类型</param>
        ''' <returns></returns>
        Public Function XmlList(url As String, type As Type) As IEnumerable
            Dim listType As Type = GetType(List(Of )).MakeGenericType(type)
            Dim obj As Object = url.LoadXml(type)
            Dim source = DirectCast(obj, IEnumerable)
            Return source
        End Function

        Public Function JsonList(url As String, type As Type) As IEnumerable
            Dim listType As Type = GetType(List(Of )).MakeGenericType(type)
            Dim json As String = IO.File.ReadAllText(url)
            Dim source As Object = LoadObject(json, type)
            Return DirectCast(source, IEnumerable)
        End Function

        ''' <summary>
        ''' 实体对象单独保存在一个json文件之中
        ''' </summary>
        ''' <param name="url"></param>
        ''' <param name="type"></param>
        ''' <returns></returns>
        Public Function DIRJson(url As String, type As Type) As IEnumerable
            Return DIRRepository(url, type, AddressOf __loadJSON, "json")
        End Function

        Private Function __loadJSON(url As String, type As Type) As Object
            Try
                Dim json As String = IO.File.ReadAllText(url)
                Return LoadObject(json, type)
            Catch ex As Exception
                ex = New Exception(url, ex)
                Call App.LogException(ex)
                Return Nothing
            End Try
        End Function

        Private Function DIRRepository(url As String, type As Type, repo As IRepository, ext As String) As IEnumerable
            Dim DIR As IO.DirectoryInfo = FileIO.FileSystem.GetDirectoryInfo(url)
            Dim LQuery As IEnumerable = From f As IO.FileInfo
                                        In DIR.EnumerateFiles
                                        Let iExt As String = f.FullName.Split("."c).Last
                                        Where String.Equals(iExt, ext, StringComparison.OrdinalIgnoreCase)
                                        Select repo(f.FullName, type)
            Return LQuery
        End Function

        Public Function DIRXml(url As String, type As Type) As IEnumerable
            Return DIRRepository(url, type, AddressOf LoadXml, "xml")
        End Function
    End Module

    Public Delegate Function IRepository(url As String, type As Type) As IEnumerable
End Namespace