dbatools

1.1.62

internal/functions/flowcontrol/Test-Bound.ps1

                                function Test-Bound {

    <#

    .SYNOPSIS

        Helper function that tests if a parameter was bound.

    .DESCRIPTION

        Helper function that tests if one or more parameters was bound.

    .PARAMETER ParameterName

        The name(s) of the parameter that is tested for being bound.

        By default, the check is true when AT LEAST one was bound.

    .PARAMETER Not

        Reverses the result. Returns true if NOT bound and false if bound.

    .PARAMETER And

        All specified parameters must be present, rather than at least one of them.

    .PARAMETER Min

        At least the specified number of parameters out of the specified parameters must be present. Default is 1.

    .PARAMETER Max

        A maximum of the specified number of parameters out of the specified parameters may be present. Default is the length of ParameterName.

    .PARAMETER BoundParameters

        The hashtable of bound parameters. Is automatically inherited from the calling function via default value. Needs not be bound explicitly.

    .EXAMPLE

        if (Test-Bound "Day")

        {

        }

        Snippet as part of a function. Will check whether the parameter "Day" was bound. If yes, whatever logic is in the conditional will be executed.

    .EXAMPLE

        Test-Bound -Not 'Login', 'Spid', 'ExcludeSpid', 'Host', 'Program', 'Database'

        Returns whether none of the parameters above were specified.

    .EXAMPLE

        Test-Bound -And 'Login', 'Spid', 'ExcludeSpid', 'Host', 'Program', 'Database'

        Returns whether any of the specified parameters was not bound.

    .EXAMPLE

        Test-Bound -ParameterName 'MinimumBuild', 'MaxBehind', 'Latest' -Max 1

        Tests for mutually exclusive but necessary parameters.

    .EXAMPLE

        Test-Bound -ParameterName 'Database', 'AllDatabases', 'ExcludeDatabase' -Min 0 -Max 1

        Tests for mutually exclusive but optional parameters.

    #>

    # Do not be tempted to use [CmdletBinding()] here, this will subtly change the way this function's parameters are bound, and break it.

    param (

        [string[]]

        $ParameterName,

        [Alias('Reverse')]

        [switch]

        $Not,

        [switch]

        $And,

        [int]

        $Min = 1,

        [int]

        $Max = $ParameterName.Length,

        [object]

        $BoundParameters = $($ExecutionContext.SessionState.PSVariable.Get('psboundparameters').Value)

    )

    if (-not $ParameterName) { return $false }

    if (-not $BoundParameters) { return $false }

    if ($And) {

        $Min = $ParameterName.Length

    }

    $usedParameters = 0

    foreach ($name in $ParameterName) {

        if ($BoundParameters.ContainsKey($name)) {

            $usedParameters++

        }

    }

    if ($usedParameters -ge $Min -and $usedParameters -le $Max) {

        $test = $true

    } else {

        $test = $false

    }

    return ((-not $Not) -eq $test)

}

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