Imports System.Data
Imports System.Xml

Public Class clsComposer
    Implements ICloneable

    Private mguidComposerID As Guid
    Private mstrComposerName As String
    Private m_blnObjectAlreadyPersisted As Boolean

    Public Sub New()
        mguidComposerID = Guid.NewGuid
        mstrComposerName = ""
        m_blnObjectAlreadyPersisted = False
    End Sub

    Public Sub New(ByVal lstrComposerName As String)
        Dim ldbcmdCommand As New SqlClient.SqlCommand
        ldbcmdCommand.CommandText = "sel_composer_by_name"

        ldbcmdCommand.CommandType = CommandType.StoredProcedure
        ' Set up parameter for stored procedure 
        Dim prmComposerName As New SqlClient.SqlParameter
        prmComposerName.ParameterName = "@composer_name"
        prmComposerName.SqlDbType = SqlDbType.VarChar
        prmComposerName.Size = MyGlobals.COMPOSER_NAME_SIZE
        prmComposerName.Value = lstrComposerName
        ldbcmdCommand.Parameters.Add(prmComposerName)

        Dim ldbdsComposers As DataSet = MyGlobals.g_objDatabaseLayer.ExecuteDataSet(ldbcmdCommand)

        If ldbdsComposers.Tables(0).Rows.Count > 0 Then
            Dim ldbrwRow As DataRow
            ldbrwRow = ldbdsComposers.Tables(0).Rows(0)

            PopulateFromDBRow(ldbrwRow)

            ldbdsComposers.Clear()
            m_blnObjectAlreadyPersisted = True
        Else
            ldbdsComposers.Clear()
            mguidComposerID = Guid.NewGuid
            mstrComposerName = lstrComposerName.Trim
            m_blnObjectAlreadyPersisted = False
        End If
    End Sub

    Public Sub New(ByVal lguidComposerID As Guid)
        mguidComposerID = lguidComposerID

        Dim ldbcmdCommand As New SqlClient.SqlCommand
        ldbcmdCommand.CommandText = "sel_composer"

        ldbcmdCommand.CommandType = CommandType.StoredProcedure
        ' Set up parameter for stored procedure 
        Dim prmComposerID As New SqlClient.SqlParameter
        prmComposerID.ParameterName = "@composer_id"
        prmComposerID.SqlDbType = SqlDbType.UniqueIdentifier
        'prmComposerID.Size = 5
        prmComposerID.Value = lguidComposerID
        ldbcmdCommand.Parameters.Add(prmComposerID)

        Dim ldbdsComposers As DataSet = MyGlobals.g_objDatabaseLayer.ExecuteDataSet(ldbcmdCommand)

        If ldbdsComposers.Tables(0).Rows.Count > 0 Then
            Dim ldbrwRow As DataRow
            ldbrwRow = ldbdsComposers.Tables(0).Rows(0)
            PopulateFromDBRow(ldbrwRow)
            m_blnObjectAlreadyPersisted = True
            MyGlobals.AddCachedObject(Me, Me.ComposerID.ToString)
        End If
        ldbdsComposers.Clear()

    End Sub

    Public Sub New(ByVal ldbrwRow As DataRow)
        PopulateFromDBRow(ldbrwRow)
        m_blnObjectAlreadyPersisted = True
        MyGlobals.AddCachedObject(Me, Me.ComposerID.ToString)
    End Sub

    Private Sub PopulateFromDBRow(ByVal ldbrwRow As DataRow)
        mguidComposerID = CType(ldbrwRow.Item("composer_id"), Guid)

        mstrComposerName = CType(ldbrwRow.Item("composer_name"), String)
    End Sub

    Public Function Delete() As Boolean
        Try
            MyGlobals.RemoveCachedObject(Me.ComposerID.ToString)

            Dim ldbcmdCommand As New SqlClient.SqlCommand
            ldbcmdCommand.CommandText = "del_composer"

            ldbcmdCommand.CommandType = CommandType.StoredProcedure
            ' Set up parameter for stored procedure 
            Dim prmComposerID As New SqlClient.SqlParameter
            prmComposerID.ParameterName = "@composer_id"
            prmComposerID.SqlDbType = SqlDbType.UniqueIdentifier
            'prmComposerID.Size = 5
            prmComposerID.Value = mguidComposerID
            ldbcmdCommand.Parameters.Add(prmComposerID)

            Dim lintRowsAffected As Integer = MyGlobals.g_objDatabaseLayer.ExecuteNonQuery(ldbcmdCommand)
            If lintRowsAffected > 0 Then
                m_blnObjectAlreadyPersisted = False
                Return True
            Else
                Return False
            End If
        Catch
            Return False
        End Try

    End Function

    Public Function Save() As Boolean
        Try
            MyGlobals.AddCachedObject(Me, Me.ComposerID.ToString)

            If m_blnObjectAlreadyPersisted Then
                Dim ldbcmdCommand As New SqlClient.SqlCommand
                ldbcmdCommand.CommandText = "upd_composer"

                ldbcmdCommand.CommandType = CommandType.StoredProcedure
                ' Set up parameter for stored procedure 
                Dim prmComposerID As New SqlClient.SqlParameter
                prmComposerID.ParameterName = "@composer_id"
                prmComposerID.SqlDbType = SqlDbType.UniqueIdentifier
                'prmComposerID.Size = 5
                prmComposerID.Value = mguidComposerID
                ldbcmdCommand.Parameters.Add(prmComposerID)
                ' Set up parameter for stored procedure 
                Dim prmComposerName As New SqlClient.SqlParameter
                prmComposerName.ParameterName = "@composer_name"
                prmComposerName.SqlDbType = SqlDbType.VarChar
                prmComposerName.Size = MyGlobals.COMPOSER_NAME_SIZE
                prmComposerName.Value = mstrComposerName
                ldbcmdCommand.Parameters.Add(prmComposerName)

                Dim lintRowsAffected As Integer = MyGlobals.g_objDatabaseLayer.ExecuteNonQuery(ldbcmdCommand)
                If lintRowsAffected > 0 Then
                    Return True
                Else
                    Return False
                End If
            Else
                Dim ldbcmdCommand As New SqlClient.SqlCommand
                ldbcmdCommand.CommandText = "ins_composer"

                ldbcmdCommand.CommandType = CommandType.StoredProcedure
                ' Set up parameter for stored procedure 
                Dim prmComposerID As New SqlClient.SqlParameter
                prmComposerID.ParameterName = "@composer_id"
                prmComposerID.SqlDbType = SqlDbType.UniqueIdentifier
                'prmComposerID.Size = 5
                prmComposerID.Value = mguidComposerID
                ldbcmdCommand.Parameters.Add(prmComposerID)
                ' Set up parameter for stored procedure 
                Dim prmComposerName As New SqlClient.SqlParameter
                prmComposerName.ParameterName = "@composer_name"
                prmComposerName.SqlDbType = SqlDbType.VarChar
                prmComposerName.Size = MyGlobals.COMPOSER_NAME_SIZE
                prmComposerName.Value = mstrComposerName
                ldbcmdCommand.Parameters.Add(prmComposerName)

                Dim lintRowsAffected As Integer = MyGlobals.g_objDatabaseLayer.ExecuteNonQuery(ldbcmdCommand)
                If lintRowsAffected > 0 Then
                    m_blnObjectAlreadyPersisted = True
                    Return True
                Else
                    Return False
                End If
            End If
        Catch
            Return False
        End Try

    End Function

    Public Function DuplicateExists(ByVal lstrComposerNameToCheck As String) As Boolean
        Try
            Dim ldbcmdCommand As New SqlClient.SqlCommand
            ldbcmdCommand.CommandText = "sel_composer_by_name"

            ldbcmdCommand.CommandType = CommandType.StoredProcedure
            ' Set up parameter for stored procedure 
            Dim prmComposerName As New SqlClient.SqlParameter
            prmComposerName.ParameterName = "@composer_name"
            prmComposerName.SqlDbType = SqlDbType.VarChar
            prmComposerName.Size = MyGlobals.COMPOSER_NAME_SIZE
            prmComposerName.Value = lstrComposerNameToCheck
            ldbcmdCommand.Parameters.Add(prmComposerName)

            Dim ldbdsComposers As DataSet = MyGlobals.g_objDatabaseLayer.ExecuteDataSet(ldbcmdCommand)

            If ldbdsComposers.Tables(0).Rows.Count > 0 Then
                Dim ldbrwRow As DataRow
                For Each ldbrwRow In ldbdsComposers.Tables(0).Rows
                    If mguidComposerID.Equals(CType(ldbrwRow.Item("composer_id"), Guid)) Then
                        'OK
                    Else
                        ldbdsComposers.Clear()
                        Return True
                    End If
                Next
            End If
            ldbdsComposers.Clear()
            Return False
        Catch
            Return False
        End Try

    End Function

    Public Property ComposerID() As Guid
        Get
            Return mguidComposerID
        End Get

        Set(ByVal lguidValue As Guid)
            mguidComposerID = lguidValue
        End Set
    End Property

    Public Property ComposerName() As String
        Get
            Return mstrComposerName
        End Get

        Set(ByVal sValue As String)
            mstrComposerName = sValue.Trim
        End Set
    End Property

    Public Property ItemAlreadyPersisted() As Boolean
        Get
            Return m_blnObjectAlreadyPersisted
        End Get
        Set(ByVal Value As Boolean)
            m_blnObjectAlreadyPersisted = Value
        End Set
    End Property

    Public Function Clone() As Object Implements ICloneable.Clone
        Dim lobjReturnValue As New clsComposer
        lobjReturnValue.ComposerID = Me.ComposerID
        lobjReturnValue.ComposerName = Me.ComposerName
        lobjReturnValue.ItemAlreadyPersisted = Me.ItemAlreadyPersisted

        Return lobjReturnValue
    End Function

    Public Function StateIsIdentical(ByVal lobjOtherComposer As clsComposer) As Boolean
        If Me.ComposerID.Equals(lobjOtherComposer.ComposerID) _
        AndAlso Me.ComposerName = lobjOtherComposer.ComposerName Then
            Return True
        Else
            Return False
        End If
    End Function

    Public Function Validate(ByRef lstrErrorString As String) As Boolean
        lstrErrorString = ""
        If Me.ComposerName.Length = 0 Then
            lstrErrorString = "Composer Name is required"
            Return False
        End If

        If Me.DuplicateExists(Me.ComposerName) Then
            lstrErrorString = "Given Composer Name already exists"
            Return False
        End If

        Return True
    End Function

    Public Function OKToDelete(ByRef lstrReferencedByString As String) As Boolean
        Dim lblnReturnValue As Boolean

        lblnReturnValue = True

        lstrReferencedByString = ""


        Dim ldbcmdCommand As New SqlClient.SqlCommand
        ldbcmdCommand.CommandText = "sel_composer_isreferenced"

        ldbcmdCommand.CommandType = CommandType.StoredProcedure
        ' Set up parameter for stored procedure 
        Dim prmComposerID As New SqlClient.SqlParameter
        prmComposerID.ParameterName = "@composer_id"
        prmComposerID.SqlDbType = SqlDbType.UniqueIdentifier
        'prmComposerID.Size = 5
        prmComposerID.Value = mguidComposerID
        ldbcmdCommand.Parameters.Add(prmComposerID)

        Dim ldbdsComposers As DataSet = MyGlobals.g_objDatabaseLayer.ExecuteDataSet(ldbcmdCommand)

        If ldbdsComposers.Tables(0).Rows.Count > 0 Then
            lblnReturnValue = False

            Dim ldbrwRow As DataRow
            For Each ldbrwRow In ldbdsComposers.Tables(0).Rows
                If Not ldbrwRow.IsNull("table_referencing_instance") Then
                    If lstrReferencedByString.Length = 0 Then
                        lstrReferencedByString = CType(ldbrwRow.Item("table_referencing_instance"), String) + "(s)"
                    Else
                        lstrReferencedByString = lstrReferencedByString + " and " + CType(ldbrwRow.Item("table_referencing_instance"), String) + "(s)"
                    End If
                End If
            Next

        End If
        ldbdsComposers.Clear()

        Return lblnReturnValue

    End Function

    Public Overrides Function ToString() As String
        Return mstrComposerName
    End Function

    Public Sub WriteXML(ByRef objXMLWriter As XmlTextWriter)
        objXMLWriter.WriteStartElement("Composer")

        objXMLWriter.WriteElementString("ComposerID", Me.ComposerID.ToString)
        objXMLWriter.WriteElementString("ComposerName", Me.ComposerName)

        objXMLWriter.WriteEndElement()
    End Sub

    Public Shared Function GetAllComposers() As System.Collections.Generic.List(Of clsComposer)
        Dim lguidComposerID As Guid
        Dim ldbcmdCommand As New SqlClient.SqlCommand
        Dim lobjComposer As clsComposer
        Dim lcolComposers As New System.Collections.Generic.List(Of clsComposer)

        ldbcmdCommand.CommandText = "sel_composer_all"

        ldbcmdCommand.CommandType = CommandType.StoredProcedure
        Dim ldbdsComposers As DataSet = MyGlobals.g_objDatabaseLayer.ExecuteDataSet(ldbcmdCommand)

        If ldbdsComposers.Tables(0).Rows.Count > 0 Then
            Dim ldbrwRow As DataRow
            For Each ldbrwRow In ldbdsComposers.Tables(0).Rows
                lguidComposerID = CType(ldbrwRow.Item("composer_id"), Guid)

                If MyGlobals.CachedObjectExists(lguidComposerID.ToString) Then
                    lobjComposer = CType(MyGlobals.CachedObjectRetrieve(lguidComposerID.ToString), clsComposer)
                Else
                    'lobjComposer = New clsComposer(lguidComposerID)
                    lobjComposer = New clsComposer(ldbrwRow)
                End If
                lcolComposers.Add(lobjComposer)
            Next
        End If
        ldbdsComposers.Clear()

        Return lcolComposers
    End Function

    Public Shared Sub AddAllComposersToCache()
        If MyGlobals.g_objObjectTypesCached.Contains("Composers") = False Then
            GetAllComposers()
            MyGlobals.g_objObjectTypesCached.Add("Composers")
        End If
    End Sub

End Class