Functions/GenXdev.Data.Preferences/Get-GenXdevPreference.ps1
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################################################################################ <# .SYNOPSIS Retrieves a preference value from the GenXdev preferences store. .DESCRIPTION The function implements a two-tier preference retrieval system. It first checks the local store for a preference value. If not found, it falls back to the default store. If still not found, returns the provided default value. .PARAMETER Name The name of the preference to retrieve from the preference stores. .PARAMETER DefaultValue The fallback value to return if the preference is not found in any store. .PARAMETER PreferencesDatabasePath Database path for preference data files. .PARAMETER SessionOnly Use alternative settings stored in session for Data preferences like Language, Database paths, etc. .PARAMETER ClearSession Clear the session setting (Global variable) before retrieving. .PARAMETER SkipSession Dont use alternative settings stored in session for Data preferences like Language, Database paths, etc. .EXAMPLE Get-GenXdevPreference -Name "Theme" -DefaultValue "Dark" .EXAMPLE getPreference "Theme" "Dark" #> function Get-GenXdevPreference { [CmdletBinding( DefaultParameterSetName = 'Default' )] [Alias('getPreference')] param( ############################################################################### [Parameter( Mandatory = $true, Position = 0, ValueFromPipeline = $true, ValueFromPipelineByPropertyName = $true, HelpMessage = 'The name of the preference to retrieve' )] [ValidateNotNullOrEmpty()] [Alias('PreferenceName')] [string] $Name, ############################################################################### [Parameter( Mandatory = $false, Position = 1, ValueFromPipelineByPropertyName = $true, HelpMessage = 'The default value if preference is not found' )] [AllowNull()] [AllowEmptyString()] [Alias('DefaultPreference')] [string] $DefaultValue, ############################################################################### [Parameter( Mandatory = $false, HelpMessage = 'Database path for preference data files' )] [Alias('DatabasePath')] [string] $PreferencesDatabasePath, ############################################################################### [Parameter( Mandatory = $false, HelpMessage = ('Use alternative settings stored in session for Data ' + 'preferences like Language, Database paths, etc') )] [switch] $SessionOnly, ############################################################################### [Parameter( Mandatory = $false, HelpMessage = ('Clear the session setting (Global variable) before ' + 'retrieving') )] [switch] $ClearSession, ############################################################################### [Parameter( Mandatory = $false, HelpMessage = ('Dont use alternative settings stored in session for ' + 'Data preferences like Language, Database paths, etc') )] [Alias('FromPreferences')] [switch] $SkipSession ############################################################################### ) begin { # create global variable name for this preference $globalVariableName = "GenXdevPreference_$Name" # output verbose information about starting preference retrieval Microsoft.PowerShell.Utility\Write-Verbose ` "Starting preference retrieval for: $Name" # handle clearing session variables first if requested if ($ClearSession) { # clear the global variable for this preference Microsoft.PowerShell.Utility\Set-Variable ` -Name $globalVariableName ` -Value $null ` -Scope Global ` -Force # output verbose information about clearing session preference Microsoft.PowerShell.Utility\Write-Verbose ` "Cleared session preference setting: $globalVariableName" } } process { # initialize the return value $value = $null # check global variable first (unless SkipSession is specified) if (-not $SkipSession) { # attempt to get the preference value from global variable $globalValue = Microsoft.PowerShell.Utility\Get-Variable ` -Name $globalVariableName ` -Scope Global ` -ValueOnly ` -ErrorAction SilentlyContinue # return global value if found and not empty if (-not ([string]::IsNullOrEmpty($globalValue))) { # output verbose information about found session value Microsoft.PowerShell.Utility\Write-Verbose ` "Found session value for '$Name': $globalValue" return $globalValue } } # fallback to persistent preferences (unless SessionOnly is specified) if (-not $SessionOnly) { # copy parameters for database path resolution function $params = GenXdev.Helpers\Copy-IdenticalParamValues ` -BoundParameters $PSBoundParameters ` -FunctionName 'GenXdev.Data\Get-GenXdevPreferencesDatabasePath' ` -DefaultValues (Microsoft.PowerShell.Utility\Get-Variable ` -Scope Local ` -ErrorAction SilentlyContinue) # resolve the actual database path using the helper function $preferencesDatabasePath = ` Get-GenXdevPreferencesDatabasePath @params # output verbose information about the database path being used Microsoft.PowerShell.Utility\Write-Verbose ` "Using database path: $preferencesDatabasePath" # fallback to persistent preferences when not session only try { # output verbose information about checking local store Microsoft.PowerShell.Utility\Write-Verbose ` "Checking local store for preference '$Name'" # copy identical parameter values for local store retrieval $getLocalParams = GenXdev.Helpers\Copy-IdenticalParamValues ` -BoundParameters $PSBoundParameters ` -FunctionName 'GenXdev.Data\Get-ValueByKeyFromStore' ` -DefaultValues (Microsoft.PowerShell.Utility\Get-Variable ` -Scope Local ` -ErrorAction SilentlyContinue) # assign specific parameters for local store retrieval $getLocalParams.StoreName = 'GenXdev.PowerShell.Preferences' $getLocalParams.KeyName = $Name $getLocalParams.SynchronizationKey = 'Local' $getLocalParams.DatabasePath = $preferencesDatabasePath $getLocalParams.ErrorAction = 'Stop' # attempt to get value from local store $value = Get-ValueByKeyFromStore @getLocalParams # if local store lookup failed, try defaults store if ([string]::IsNullOrEmpty($value)) { # output verbose information about checking defaults store Microsoft.PowerShell.Utility\Write-Verbose ` 'Preference not found locally, checking defaults store' # copy identical parameter values for defaults store retrieval $getDefaultParams = GenXdev.Helpers\Copy-IdenticalParamValues ` -BoundParameters $PSBoundParameters ` -FunctionName 'GenXdev.Data\Get-ValueByKeyFromStore' ` -DefaultValues (Microsoft.PowerShell.Utility\Get-Variable ` -Scope Local ` -ErrorAction SilentlyContinue) # assign specific parameters for defaults store retrieval $getDefaultParams.StoreName = 'GenXdev.PowerShell.Preferences' $getDefaultParams.KeyName = $Name $getDefaultParams.SynchronizationKey = 'Defaults' $getDefaultParams.DatabasePath = $preferencesDatabasePath $getDefaultParams.ErrorAction = 'Stop' # attempt to get value from defaults store $value = Get-ValueByKeyFromStore @getDefaultParams } # if we found a value in persistent storage, return it if (-not ([string]::IsNullOrEmpty($value))) { # output verbose information about returning persistent value Microsoft.PowerShell.Utility\Write-Verbose ` "Returning persistent value: $value" return $value } } catch { # output verbose information about error accessing stores Microsoft.PowerShell.Utility\Write-Verbose ` "Error accessing preference stores: $_" } } # output verbose information about using default value Microsoft.PowerShell.Utility\Write-Verbose ` "Using provided default value: $DefaultValue" return $DefaultValue } end { } } ################################################################################ |