Src/Private/Resolve-LabSwitch.ps1

function Resolve-LabSwitch {
<#
    .SYNOPSIS
        Resolves the specified switch using configuration data.
#>

    [CmdletBinding()]
    [OutputType([System.Collections.Hashtable])]
    param (
        ## Switch Id/Name
        [Parameter(Mandatory, ValueFromPipeline)]
        [System.String] $Name,

        ## PowerShell DSC configuration document (.psd1) containing lab metadata.
        [Parameter(Mandatory, ValueFromPipelineByPropertyName)]
        [System.Collections.Hashtable]
        [Microsoft.PowerShell.DesiredStateConfiguration.ArgumentToConfigurationDataTransformationAttribute()]
        $ConfigurationData
    )
    process {

        $hostDefaults = Get-ConfigurationData -Configuration Host;
        $networkSwitch = $ConfigurationData.NonNodeData.$($labDefaults.ModuleName).Network.Where({ $_.Name -eq $Name });

        if ($hostDefaults.DisableSwitchEnvironmentName -eq $false) {

            ## Prefix/suffix switch name
            $Name = Resolve-LabEnvironmentName -Name $Name -ConfigurationData $ConfigurationData;
        }

        if ($networkSwitch) {

            $networkHashtable = @{};
            foreach ($key in $networkSwitch.Keys) {

                [ref] $null = $networkHashtable.Add($key, $networkSwitch.$Key);
            }
            $networkSwitch = New-LabSwitch @networkHashtable;
        }
        elseif (Get-VMSwitch -Name $Name -ErrorAction SilentlyContinue) {

            ## Use an existing virtual switch with a matching name if one exists
            Write-Warning -Message ($localized.UsingExistingSwitchWarning -f $Name);
            $existingSwitch = Get-VMSwitch -Name $Name;
            $networkSwitch = @{
                Name = $existingSwitch.Name;
                Type = $existingSwitch.SwitchType;
                AllowManagementOS = $existingSwitch.AllowManagementOS;
                IsExisting = $true;
            }
            if (($existingSwitch.NetAdapterInterfaceDescription).Name) {

                $existingSwitchAdapter = Get-NetAdapter -InterfaceDescription $existingSwitch.NetAdapterInterfaceDescription;
                $networkSwitch['NetAdapterName'] = $existingSwitchAdapter.Name;
            }
        }
        else {

            ## Create an internal switch
            $networkSwitch = @{ Name = $Name; Type = 'Internal'; }
        }

        return $networkSwitch;

    } #end process
} #end function

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