PSSlack

0.0.1

Private/Add-ObjectDetail.ps1

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 function Add-ObjectDetail
{
    <#
    .SYNOPSIS
        Decorate an object with
            - A TypeName
            - New properties
            - Default parameters
 
    .DESCRIPTION
        Helper function to decorate an object with
            - A TypeName
            - New properties
            - Default parameters
 
    .PARAMETER InputObject
        Object to decorate. Accepts pipeline input.
 
    .PARAMETER TypeName
        Typename to insert.
         
        This will show up when you use Get-Member against the resulting object.
         
    .PARAMETER PropertyToAdd
        Add these noteproperties.
         
        Format is a hashtable with Key (Property Name) = Value (Property Value).
 
        Example to add a One and Date property:
 
            -PropertyToAdd @{
                One = 1
                Date = (Get-Date)
            }
 
    .PARAMETER DefaultProperties
        Change the default properties that show up
 
    .PARAMETER Passthru
        Whether to pass the resulting object on. Defaults to true
 
    .EXAMPLE
        #
        # Create an object to work with
        $Object = [PSCustomObject]@{
            First = 'Cookie'
            Last = 'Monster'
            Account = 'CMonster'
        }
 
        #Add a type name and a random property
        Add-ObjectDetail -InputObject $Object -TypeName 'ApplicationX.Account' -PropertyToAdd @{ AnotherProperty = 5 }
 
            # First Last Account AnotherProperty
            # ----- ---- ------- ---------------
            # Cookie Monster CMonster 5
 
        #Verify that get-member shows us the right type
        $Object | Get-Member
 
            # TypeName: ApplicationX.Account ...
 
    .EXAMPLE
        #
        # Create an object to work with
        $Object = [PSCustomObject]@{
            First = 'Cookie'
            Last = 'Monster'
            Account = 'CMonster'
        }
 
        #Add a random property, set a default property set so we only see two props by default
        Add-ObjectDetail -InputObject $Object -PropertyToAdd @{ AnotherProperty = 5 } -DefaultProperties Account, AnotherProperty
 
            # Account AnotherProperty
            # ------- ---------------
            # CMonster 5
 
        #Verify that the other properties are around
        $Object | Select -Property *
 
            # First Last Account AnotherProperty
            # ----- ---- ------- ---------------
            # Cookie Monster CMonster 5
 
    .NOTES
        This breaks the 'do one thing' rule from certain perspectives...
        The goal is to decorate an object all in one shot
    
        This abstraction simplifies decorating an object, with a slight trade-off in performance. For example:
 
        10,000 objects, add a property and typename:
            Add-ObjectDetail: ~4.6 seconds
            Add-Member + PSObject.TypeNames.Insert: ~3 seconds
 
        Initial code borrowed from Shay Levy:
        http://blogs.microsoft.co.il/scriptfanatic/2012/04/13/custom-objects-default-display-in-powershell-30/
         
    .LINK
        http://ramblingcookiemonster.github.io/Decorating-Objects/
 
    .FUNCTIONALITY
        PowerShell Language
    #>
    [CmdletBinding()] 
    param(
           [Parameter( Mandatory = $true,
                       Position=0,
                       ValueFromPipeline=$true )]
           [ValidateNotNullOrEmpty()]
           [psobject[]]$InputObject,

           [Parameter( Mandatory = $false,
                       Position=1)]
           [string]$TypeName,

           [Parameter( Mandatory = $false,
                       Position=2)]    
           [System.Collections.Hashtable]$PropertyToAdd,

           [Parameter( Mandatory = $false,
                       Position=3)]
           [ValidateNotNullOrEmpty()]
           [Alias('dp')]
           [System.String[]]$DefaultProperties,

           [boolean]$Passthru = $True
    )
    
    Begin
    {
        if($PSBoundParameters.ContainsKey('DefaultProperties'))
        {
            # define a subset of properties
            $ddps = New-Object System.Management.Automation.PSPropertySet DefaultDisplayPropertySet,$DefaultProperties
            $PSStandardMembers = [System.Management.Automation.PSMemberInfo[]]$ddps
        }
    }
    Process
    {
        foreach($Object in $InputObject)
        {
            switch ($PSBoundParameters.Keys)
            {
                'PropertyToAdd'
                {
                    foreach($Key in $PropertyToAdd.Keys)
                    {
                        #Add some noteproperties. Slightly faster than Add-Member.
                        $Object.PSObject.Properties.Add( ( New-Object System.Management.Automation.PSNoteProperty($Key, $PropertyToAdd[$Key]) ) )  
                    }
                }
                'TypeName'
                {
                    #Add specified type
                    [void]$Object.PSObject.TypeNames.Insert(0,$TypeName)
                }
                'DefaultProperties'
                {
                    # Attach default display property set
                    Add-Member -InputObject $Object -MemberType MemberSet -Name PSStandardMembers -Value $PSStandardMembers
                }
            }
            if($Passthru)
            {
                $Object
            }
        }
    }
}