[PS][Experimental] Add validations to model

modules/openapi-generator/src/main/resources/powershell-experimental/model.mustache

@@ -24,7 +24,7 @@ function Initialize-{{{apiNamePrefix}}}{{{classname}}} {
     [CmdletBinding()]
     Param (
 {{#allVars}}
-        [Parameter(Position = {{vendorExtensions.x-index}}, ValueFromPipelineByPropertyName = $true{{#required}}, Mandatory = $true{{/required}})]
+        [Parameter(Position = {{vendorExtensions.x-index}}, ValueFromPipelineByPropertyName = $true)]
         [{{vendorExtensions.x-powershell-data-type}}]
         {{=<% %>=}}
         ${<%name%>}<%^-last%>,<%/-last%>
@@ -36,6 +36,60 @@ function Initialize-{{{apiNamePrefix}}}{{{classname}}} {
         'Creating PSCustomObject: {{{packageName}}} => {{{apiNamePrefix}}}{{{classname}}}' | Write-Debug
         $PSBoundParameters | Out-DebugParameter | Write-Debug
 
+        {{#vars}}
+        {{^isNullable}}
+        {{#required}}
+        if (!${{{name}}}) {
+            throw "invalid value for '{{{name}}}', '{{{name}}}' cannot be null."
+        }
+
+        {{/required}}
+        {{/isNullable}}
+        {{#hasValidation}}
+        {{#maxLength}}
+        if ({{^required}}!${{{name}}} -and {{/required}}${{{name}}}.length -gt {{{maxLength}}}) {
+            throw "invalid value for '{{{name}}}', the character length must be smaller than or equal to {{{maxLength}}}."
+        }
+
+        {{/maxLength}}
+        {{#minLength}}
+        if ({{^required}}!${{{name}}} -and {{/required}}${{{name}}}.length -lt {{{minLength}}}) {
+            throw "invalid value for '{{{name}}}', the character length must be great than or equal to {{{minLength}}}."
+        }
+
+        {{/minLength}}
+        {{#maximum}}
+        if ({{^required}}!${{{name}}} -and {{/required}}${{{name}}} {{#exclusiveMaximum}}-ge{{/exclusiveMaximum}}{{^exclusiveMaximum}}-gt{{/exclusiveMaximum}} {{{maximum}}}) {
+          throw "invalid value for '{{{name}}}', must be smaller than {{^exclusiveMaximum}}or equal to {{/exclusiveMaximum}}{{{maximum}}}."
+        }
+
+        {{/maximum}}
+        {{#minimum}}
+        if ({{^required}}!${{{name}}} -and {{/required}}${{{name}}} {{#exclusiveMinimum}}-le{{/exclusiveMinimum}}{{^exclusiveMinimum}}-lt{{/exclusiveMinimum}} {{{minimum}}}) {
+          throw "invalid value for '{{{name}}}', must be greater than {{^exclusiveMinimum}}or equal to {{/exclusiveMinimum}}{{{minimum}}}."
+        }
+
+        {{/minimum}}
+        {{#pattern}}
+        if ({{^required}}!${{{name}}} -and {{/required}}${{{name}}} -notmatch "{{{pattern}}}") {
+            throw "invalid value for '{{{name}}}', must conform to the pattern {{{pattern}}}."
+        }
+
+        {{/pattern}}
+        {{#maxItems}}
+        if ({{^required}}!${{{name}}} -and {{/required}}${{{name}}}.length -gt {{{maxItems}}}) {
+            throw "invalid value for '{{{name}}}', number of items must be less than or equal to {{{maxItems}}}."
+        }
+
+        {{/maxItems}}
+        {{#minItems}}
+        if ({{^required}}!${{{name}}} -and {{/required}}${{{name}}}.length -lt {{{minItems}}}) {
+            throw "invalid value for '{{{name}}}', number of items must be greater than or equal to {{{minItems}}}."
+        }
+
+        {{/minItems}}
+        {{/hasValidation}}
+        {{/vars}}
         $PSO = [PSCustomObject]@{
             {{=<< >>=}}
             <<#allVars>>

samples/client/petstore/powershell-experimental/src/PSPetstore/Model/Category.ps1

@@ -40,6 +40,10 @@ function Initialize-PSCategory {
         'Creating PSCustomObject: PSPetstore => PSCategory' | Write-Debug
         $PSBoundParameters | Out-DebugParameter | Write-Debug
 
+        if (!$Name -and $Name -notmatch "/^[a-zA-Z0-9]+[a-zA-Z0-9\\.\\-_]*[a-zA-Z0-9]+$/") {
+            throw "invalid value for 'Name', must conform to the pattern /^[a-zA-Z0-9]+[a-zA-Z0-9\\.\\-_]*[a-zA-Z0-9]+$/."
+        }
+
         $PSO = [PSCustomObject]@{
             "id" = ${Id}
             "name" = ${Name}

samples/client/petstore/powershell-experimental/src/PSPetstore/Model/Pet.ps1

@@ -46,10 +46,10 @@ function Initialize-PSPet {
         [Parameter(Position = 1, ValueFromPipelineByPropertyName = $true)]
         [PSCustomObject]
         ${Category},
-        [Parameter(Position = 2, ValueFromPipelineByPropertyName = $true, Mandatory = $true)]
+        [Parameter(Position = 2, ValueFromPipelineByPropertyName = $true)]
         [String]
         ${Name},
-        [Parameter(Position = 3, ValueFromPipelineByPropertyName = $true, Mandatory = $true)]
+        [Parameter(Position = 3, ValueFromPipelineByPropertyName = $true)]
         [String[]]
         ${PhotoUrls},
         [Parameter(Position = 4, ValueFromPipelineByPropertyName = $true)]
@@ -64,6 +64,14 @@ function Initialize-PSPet {
         'Creating PSCustomObject: PSPetstore => PSPet' | Write-Debug
         $PSBoundParameters | Out-DebugParameter | Write-Debug
 
+        if (!$Name) {
+            throw "invalid value for 'Name', 'Name' cannot be null."
+        }
+
+        if (!$PhotoUrls) {
+            throw "invalid value for 'PhotoUrls', 'PhotoUrls' cannot be null."
+        }
+
         $PSO = [PSCustomObject]@{
             "id" = ${Id}
             "category" = ${Category}