Join.ps1
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<#PSScriptInfo
.VERSION 2.4.4 .GUID 54688e75-298c-4d4b-a2d0-d478e6069126 .AUTHOR iRon .DESCRIPTION Join-Object combines two objects lists based on a related property between them. .COMPANYNAME .COPYRIGHT .TAGS Join-Object Join InnerJoin LeftJoin RightJoin FullJoin CrossJoin Update Merge Combine Table .LICENSEURI https://github.com/iRon7/Join-Object/LICENSE.txt .PROJECTURI https://github.com/iRon7/Join-Object .ICONURI https://raw.githubusercontent.com/iRon7/Join-Object/master/Join-Object.png .EXTERNALMODULEDEPENDENCIES .REQUIREDSCRIPTS .EXTERNALSCRIPTDEPENDENCIES .RELEASENOTES .PRIVATEDATA #> <# .SYNOPSIS Combines two objects lists based on a related property between them. .DESCRIPTION Combines properties from one or more objects. It creates a set that can be saved as a new object or used as it is. An object join is a means for combining properties from one (self-join) or more tables by using values common to each. The Join-Object cmdlet supports a few proxy commands with their own defaults: * InnerJoin-Object (Join-Object -JoinType Inner) Only returns the joined objects * LeftJoin-Object (Join-Object -JoinType Left) Returns the joined objects and the rest of the left objects * RightJoin-Object (Join-Object -JoinType Right) Returns the joined objects and the rest of the right objects * FullJoin-Object (Join-Object -JoinType Full) Returns the joined objects and the rest of the left and right objects * CrossJoin-Object (Join-Object -JoinType Cross) Joins each left object to each right object * Update-Object (Join-Object -JoinType Left -MergeExpression = {RightOrLeft.$_}) Updates the left object with the right object properties * Merge-Object (Join-Object -JoinType Full -MergeExpression = {RightOrLeft.$_}) Updates the left object with the right object properties and inserts right if the values of the related property is not equal. Each command has an alias equal to its verb (omitting '-Object'). .PARAMETER LeftObject The LeftObject, usually provided through the pipeline, defines the left object (or list of objects) to be joined. .PARAMETER RightObject The RightObject, provided by the (first) argument, defines the right object (or list of objects) to be joined. .PARAMETER On The -On (alias -Using) parameter defines the condition that specify how to join the left and right object and which objects to include in the (inner) result set. The -On parameter supports the following formats: <String> or <Array> If the value is a string or array type, the -On parameter is similar to the SQL using clause. This means that all the listed properties require to be equal (at the left and right side) to be included in the (inner) result set. The listed properties will output a single value by default (see also the -Property parameter). <ScriptBlock> Any conditional expression (where $Left refers to each left object and $Right refers to each right object) which requires to evaluate to true in order to join the objects. Note 1: The -On <ScriptBlock> type has the most complex comparison possibilities but is considerable slower than the other types. Note 2: If the -On parameter is omitted, a join by index is returned. .PARAMETER Equals Requires the -On value to be a string. The property of the left object defined by the -On value requires to be equal to the property of the right object defined by the -Equals value for the objects to be joined and added to the result sets. .PARAMETER MergeExpression An expression that defines how the left and right properties with the common property should be merged. Where the following variables are available: * $_: iterates each property name * $Keys: an array containing all the (left and right) keys * $Left: the current left object (each self-contained -LeftObject) * $LeftOrVoid: the left object otherwise an object with null values * $LeftOrRight: the left object otherwise the right object * $LeftKeys: an array containing all the left keys * $Right: the current right object (each self-contained -RightObject) * $RightOrVoid: the right object otherwise an object with null values * $RightOrLeft: the right object otherwise the left object * $RightKeys: an array containing all the right keys The default -MergeExpression is: {$Left.$_, $Right.$_} The merge expression is only used in case that the left and right properties are overlapping .PARAMETER Property A hash table or list of property names (strings) and/or hash tables. Hash tables should be in the format @{<PropertyName> = <Expression>} where the <Expression> usually defines how the specific left and right properties should be merged. If only a name (string) is supplied, the default merge expression is used Existing properties set by the (default) merge expression will be overwritten by the -Property parameter. Any unknown properties will be added to the output object. .EXAMPLE PS C:\> $Employee Name Country Department ---- ------- ---------- Aerts Belgium Sales Bauer Germany Engineering Cook England Sales Duval France Engineering Evans England Marketing Fischer Germany Engineering PS C:\> $Department Name Manager Country ---- ------- ------- Engineering Meyer Germany Marketing Morris England Sales Millet France Board Mans Netherlands PS C:\> $Employee | LeftJoin $Department -On Country Department Name Country Manager ---------- ---- ------- ------- Sales {Aerts, $null} Belgium Engineering {Bauer, Engineering} Germany Meyer Sales {Cook, Marketing} England Morris Engineering {Duval, Sales} France Millet Marketing {Evans, Marketing} England Morris Engineering {Fischer, Engineering} Germany Meyer .EXAMPLE PS C:\> $Changes Name Country Department ---- ------- ---------- Aerts Germany Sales Bauer Germany Marketing Geralds Belgium Engineering PS C:\> $Employee | Merge $Changes -On Name Department Name Country ---------- ---- ------- Sales Aerts Germany Marketing Bauer Germany Sales Cook England Engineering Duval France Marketing Evans England Engineering Fischer Germany Engineering Geralds Belgium .EXAMPLE PS C:\> $Employee | Join $Department -On Department -Eq Name -Property @{Name = {$Left.$_}}, "Manager" Name Manager ---- ------- Aerts Millet Bauer Meyer Cook Millet Duval Meyer Evans Morris Fischer Meyer .EXAMPLE PS C:\> $Employees EmployeeId FirstName LastName ReportsTo ---------- --------- -------- --------- 1 Nancy Davolio 2 2 Andrew Fuller 3 Janet Leveling 2 4 Margaret Peacock 2 5 Steven Buchanan 2 6 Michael Suyama 5 7 Robert King 5 8 Laura Callahan 2 9 Anne Dodsworth 5 PS C:\> $Employees | InnerJoin $Employees -On ReportsTo -Eq EmployeeID -Property @{ Name = {"$($Left.FirstName) $($Left.LastName)"} Manager = {"$($Right.FirstName) $($Right.LastName)"} } Name Manager ---- ------- Nancy Davolio Andrew Fuller Janet Leveling Andrew Fuller Margaret Peacock Andrew Fuller Steven Buchanan Andrew Fuller Michael Suyama Steven Buchanan Robert King Steven Buchanan Laura Callahan Andrew Fuller Anne Dodsworth Steven Buchanan .LINK https://github.com/iRon7/Join-Object #> Function Join-Object { [CmdletBinding(DefaultParametersetName='None')][OutputType([Object[]])]Param ( [Parameter(ValueFromPipeLine = $True)][Object[]]$LeftObject, [Parameter(Position=0)][Object[]]$RightObject, [Parameter(Position = 1, ParameterSetName='On')][Alias("Using")]$On, [Parameter(ParameterSetName='On')][String]$Equals, [Parameter(Position = 2)][ScriptBlock]$MergeExpression = {$LeftOrVoid.$_, $RightOrVoid.$_}, [Parameter(Position = 3)]$Property, [Parameter(Position = 4)][ValidateSet('Inner', 'Left', 'Right', 'Full', 'Cross')]$JoinType = 'Inner' ) Begin { $Keys = @(); $All = $False; $Expression = @{}; $New = New-Object System.Collections.Specialized.OrderedDictionary $RightKeys = @(); $RightObject[0].PSObject.Properties | ForEach-Object {$RightKeys += $_.Name} $RightLength = @($RightObject).Length; $RightOffs = @($False) * $RightLength; $LeftIndex = 0 Function Join-Output($Left, $Right, $LeftOrRight, $RightOrLeft, $LeftOrVoid, $RightOrVoid) { $Keys | ForEach-Object {$New.$_ = &$Expression.$_}; New-Object PSObject -Property $New } } Process { ForEach ($Left in @($LeftObject)) { $LeftOff = $False If (!$LeftIndex) { $LeftKeys = @(); $LeftObject[0].PSObject.Properties | ForEach-Object {$LeftKeys += $_.Name} If ($Property.PSTypeNames -Match "^System.Collections") {$Expression = $Property; $Keys = $Property.Keys} Else { @($Property) | Where-Object {$_} | ForEach-Object { If ($_.PSObject.Properties['Keys']) {$Expression += $_; $Keys += $_.Keys} Else {If ($_ -eq "*") {[Ref]$All.Value = $True} Else {$Keys += "$_"}} } If (!$Property -or $All) {$Keys = $Keys + $LeftKeys + $RightKeys | Select-Object -Unique} $Keys | Where-Object {!$Expression.ContainsKey($_)} | ForEach-Object { $Using = If ($On -is [Array]) {@($On) -Contains $_} Else {$On -isnot [ScriptBlock] -and !$Equals -and $_ -eq $On} $Expression.$_ = If ($Using) {{$LeftOrRight.$_}} ElseIf ($LeftKeys -Contains $_) {If ($RightKeys -Contains $_) {$MergeExpression} Else {{$LeftOrVoid.$_}}} Else {{$RightOrVoid.$_}} } } $Keys | ForEach-Object {$New.$_ = $Null}; $Void = New-Object PSObject -Property $New } If ($On -or $JoinType -eq "Cross") { For ($RightIndex = 0; $RightIndex -lt $RightLength; $RightIndex++) {$Right = $RightObject[$RightIndex] $Select = If ($On -is [Array]) {$Null -eq ($On | Where-Object {!($Left.$_ -eq $Right.$_)})} ElseIf ($On -is [ScriptBlock]) {&$On} Else {If ($Equals) {$Left.$On -eq $Right.$Equals} Else {$Left.$On -eq $Right.$On}} If ($Select) { Join-Output $Left $Right $Left $Right $Left $Right $LeftOff = $True; $RightOffs[$RightIndex] = $True } } } Elseif ($LeftIndex -lt $RightLength) { $RightIndex = $LeftIndex; $Right = $RightObject[$RightIndex] Join-Output $Left $Right $Left $Right $Left $Right $LeftOff = $True; $RightOffs[$RightIndex] = $True } If (!$LeftOff -And ($JoinType -eq "Left" -or $JoinType -eq "Full")) {Join-Output $Left $Null $Left $Left $Left $Void} $LeftIndex++ } } End { If ($JoinType -eq "Right" -or $JoinType -eq "Full") {$Left = $Null For ($RightIndex = 0; $RightIndex -lt $RightOffs.Length; $RightIndex++) { If (!$RightOffs[$RightIndex]) {$Right = $RightObject[$RightIndex] Join-Output $Null $Right $Right $Right $Void $Right } } } } }; Set-Alias Join Join-Object Function Copy-Command([System.Management.Automation.CommandInfo]$Command, [String]$Name, [HashTable]$DefaultParameters) { Try { $MetaData = [System.Management.Automation.CommandMetadata]::New($Command) $Value = [System.Management.Automation.ProxyCommand]::Create($MetaData) $Null = New-Item -Path Function:\ -Name "Script:$Name" -Value $Value -Force ForEach ($Key in $DefaultParameters.Keys) {$PSDefaultParameterValues["$Name`:$Key"] = $DefaultParameters.$Key} } Catch {$PSCmdlet.WriteError($_)} } $JoinCommand = Get-Command Join-Object Copy-Command $JoinCommand InnerJoin-Object @{JoinType = 'Inner'}; Set-Alias InnerJoin InnerJoin-Object Copy-Command $JoinCommand LeftJoin-Object @{JoinType = 'Left'}; Set-Alias LeftJoin LeftJoin-Object Copy-Command $JoinCommand RightJoin-Object @{JoinType = 'Right'}; Set-Alias RightJoin RightJoin-Object Copy-Command $JoinCommand FullJoin-Object @{JoinType = 'Full'}; Set-Alias FullJoin FullJoin-Object Copy-Command $JoinCommand CrossJoin-Object @{JoinType = 'Cross'}; Set-Alias CrossJoin CrossJoin-Object Copy-Command $JoinCommand Update-Object @{JoinType = 'Left'; MergeExpression = {{$RightOrLeft.$_}}}; Set-Alias Update Update-Object Copy-Command $JoinCommand Merge-Object @{JoinType = 'Full'; MergeExpression = {{$RightOrLeft.$_}}}; Set-Alias Merge Merge-Object |