N°6414 Move existing AbstractSimpleField::Validate impl to custom validators

- LinkedSetField
- SelectObjectField
- MultipleChoicesField (warning this hierarchy contains non multiple value fields like SelectField !)

Also change AbstractValidator::Validate signature : now we are returning an array of error messages, so that we can return multiple ones

sources/Form/Validator/SelectObjectValidator.php

@@ -0,0 +1,45 @@
+<?php
+/*
+ * @copyright   Copyright (C) 2010-2023 Combodo SARL
+ * @license     http://opensource.org/licenses/AGPL-3.0
+ */
+
+namespace Combodo\iTop\Form\Validator;
+
+use Combodo\iTop\Form\Helper\FieldHelper;
+use DBSearch;
+use utils;
+
+class SelectObjectValidator extends AbstractValidator
+{
+    public const VALIDATOR_NAME = 'select_object_validator';
+
+    /** @var \DBSearch $oSearch */
+    private $oSearch;
+
+    public function __construct(DBSearch $oSearch)
+    {
+        parent::__construct();
+
+        $this->oSearch = $oSearch;
+    }
+
+    public function Validate($value): array
+    {
+        if (utils::IsNullOrEmptyString($value)) {
+            return [];
+        }
+        if (($value === 0) || ($value === '0')) {
+            return [];
+        }
+
+        $oSetForExistingCurrentValue = FieldHelper::GetObjectsSetFromSearchAndCurrentValueId($this->oSearch, $value);
+        $iObjectsCount = $oSetForExistingCurrentValue->CountWithLimit(1);
+
+        if ($iObjectsCount === 0) {
+            return ["Value $value does not match the corresponding filter set"];
+        }
+
+        return [];
+    }
+}