biz.dfch.PS.Appclusive.Client

4.4.1.20160728

Pop-ChangeTracker.ps1

                                function Pop-ChangeTracker {

<#

.SYNOPSIS

Pops the contents of the DataServiceContext ChangeTracker from the DataContext stack.

.DESCRIPTION

Pops the contents of the DataServiceContext ChangeTracker from the DataContext stack.

.INPUTS

The Cmdlet can either pop a context or clear the contents of the DataContext stack.

See PARAMETERS section on possible inputs.

.OUTPUTS

[System.Collections.Hashtable]

.LINK

Online Version: http://dfch.biz/biz/dfch/PS/Appclusive/Client/Push-ChangeTracker/

.NOTES

See module manifest for required software versions and dependencies.

#>

[CmdletBinding(

    SupportsShouldProcess = $true

    ,

    ConfirmImpact = 'Medium'

    ,

    HelpURI = 'http://dfch.biz/PS/Appclusive/Client/Pop-ChangeTracker/'

)]

[OutputType([Boolean])]

Param 

(

    [ValidateScript({$_.ContainsKey('Entities') -And $_.ContainsKey('Links')})]

    [Parameter(Mandatory = $false, Position = 0)]

    [hashtable] $DataContext = (Get-Variable -Name $MyInvocation.MyCommand.Module.PrivateData.MODULEVAR -ValueOnly).DataContext.Pop()

    ,

    # Specifies a references to the Appclusive endpoints

    [Parameter(Mandatory = $false)]

    [Alias('Services')]

    [hashtable] $svc = (Get-Variable -Name $MyInvocation.MyCommand.Module.PrivateData.MODULEVAR -ValueOnly).Services

    ,

    # Specifies the service or container name of the entity to remove

    [ValidateScript( { if($svc.Keys -contains $_) { $true; } else { throw('{0}: Invalid service name specified.' -f $_); } } )]

    [Parameter(Mandatory = $false, Position = 0)]

    [Alias("Container")]

    [string] $Service = 'Core'

    ,

    [Parameter(Mandatory = $false)]

    [switch] $Clear = $false

    ,

    [Parameter(Mandatory = $false)]

    [Object[]] $Exclude

)

    trap { Log-Exception $_; break; }

    $datBegin = [datetime]::Now;

    [string] $fn = $MyInvocation.MyCommand.Name;

    $ModuleVar = Get-ModuleVariable;

    Log-Debug -fn $fn -msg ("CALL. DataContext stack size '{0}'." -f $ModuleVar.DataContext.Count) -fac 1;

    # Parameter validation

    Contract-Requires ($svc.Core -is [biz.dfch.CS.Appclusive.Api.Core.Core]) "Connect to the server before using the Cmdlet"

    $EntitySetName = 'Entities';

    Contract-Requires (!!(Get-Member -InputObject $svc.$Service -MemberType Properties -Name $EntitySetName)) "'Entities' is not a valid entity set in specified Service"

    $EntitySetName = 'Links';

    Contract-Requires (!!(Get-Member -InputObject $svc.$Service -MemberType Properties -Name $EntitySetName)) "'Links' is not a valid entity set in specified Service"

    Contract-Requires ($DataContext -is [hashtable]) 

    Contract-Requires ($svc.$Service.GetType().BaseType.FullName -eq 'System.Data.Services.Client.DataServiceContext') 

    $m = $svc.$Service;

    $fReturn = $false;

    $OutputParameter = $null;

    $fLinks = $false;

    $fEntities = $false;

    if($Clear) 

    {

        foreach($e in $m.Entities) 

        { 

            $null = $m.Detach($e.Entity); 

        }

        foreach($l in $m.Links) 

        { 

            $null = $m.DetachLink($l.Source, $l.SourceProperty, $l.Target); 

        }

    }

    else 

    {

        if($DataContext.ContainsKey('Entities')) 

        {

            $e = '';

            $aE = $DataContext.Entities;

            foreach($e in $m.Entities) 

            { 

                if(!$aE.Contains($e.Entity)) 

                { 

                    $null = $m.Detach($e.Entity);

                }

            }

            $aE.Clear();

            Remove-Variable aE;

            Remove-Variable e;

            $fEntities = $true;

        }

        if($DataContext.ContainsKey('Links')) 

        {

            $l = '';

            $aL = $DataContext.Links;

            foreach($l in $m.Links) 

            { 

                if(!$aL.Contains($l)) 

                { 

                    $null = $m.DetachLink($l.Source, $l.SourceProperty, $l.Target); 

                }

            }

            $aL.Clear();

            Remove-Variable aL;

            Remove-Variable l;

            $fLinks = $true;

        }

    }

    if($fLinks -Or $fEntities) 

    { 

        $fReturn = $true; 

    }

    $datEnd = [datetime]::Now;

    Log-Debug -fn $fn -msg ("RET. fReturn: [{0}]. Execution time: [{1}]ms. Started: [{2}]. Tracked objects currently: Entities [{3}]. Links [{4}]." -f $fReturn, ($datEnd - $datBegin).TotalMilliseconds, $datBegin.ToString('yyyy-MM-dd HH:mm:ss.fffzzz'), $m.Entities.Count, $m.Links.Count) -fac 2;

    return $fReturn;

}

if($MyInvocation.ScriptName) { Export-ModuleMember -Function Pop-ChangeTracker; } 

# 

# Copyright 2014-2015 d-fens GmbH

# 

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

# 

# http://www.apache.org/licenses/LICENSE-2.0

# 

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

# 

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