classes/WmiFilterList.ps1
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class WmiFilterList:System.Collections.Generic.List[WmiFilterObject] { WmiFilterList () {} WmiFilterList ( [string]$Filter ) { if ( $Filter -notmatch '^(?:\d+;){4}.+' ) { throw 'Invalid WMI filter' } # first substring in a filter is the filter count [int]$FilterCount, $RemainingFilter = $Filter.Split( ';', 2 ) while ( $FilterCount -gt 0 ) { # each filter is a list of lengths and string sections # we use the substring length instead of just a split on ';' to ensure # semi-colons in the filter are properly captured [int]$LanguageLength, [int]$NameSpaceLength, [int]$FilterLength, $RemainingFilter = $RemainingFilter.Split( ';', 4 ) $WmiFilterObject = [WmiFilterObject]@{ Language = $RemainingFilter.Substring( 0, $LanguageLength ) NameSpace = $RemainingFilter.Substring( $LanguageLength + 1, $NameSpaceLength ) Filter = $RemainingFilter.Substring( $LanguageLength + 1 + $NameSpaceLength + 1, $FilterLength ) } $this.Add( $WmiFilterObject ) > $null $RemainingFilter = $RemainingFilter.Substring( $LanguageLength + 1 + $NameSpaceLength + 1 + $FilterLength + 1 ) $FilterCount -- } } WmiFilterList ( [WmiFilterObject[]] $WmiFilterObject ) { $this.AddRange( $WmiFilterObject ) > $null #$WmiFilterObject | ForEach-Object { $this.Add( $_ ) } } [string] ToString () { return ( [string]$this.Count + ';' + -join( $this | ForEach-Object { $_.ToString() } ) ) } } |