entity person: create a validator to check a person entity is linked

with a center

This validator take a parameter in configuration

src/Bundle/ChillPersonBundle/Validator/Constraints/Person/PersonHasCenter.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace Chill\PersonBundle\Validator\Constraints\Person;
+
+class PersonHasCenter extends \Symfony\Component\Validator\Constraint
+{
+    public string $message = "A center is required";
+
+    public function getTargets()
+    {
+        return [
+            self::CLASS_CONSTRAINT
+        ];
+    }
+}

src/Bundle/ChillPersonBundle/Validator/Constraints/Person/PersonHasCenterValidator.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace Chill\PersonBundle\Validator\Constraints\Person;
+
+use Chill\PersonBundle\Entity\Person;
+use Symfony\Component\DependencyInjection\ParameterBag\ParameterBagInterface;
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\Exception\UnexpectedTypeException;
+
+class PersonHasCenterValidator extends \Symfony\Component\Validator\ConstraintValidator
+{
+    private bool $centerRequired;
+
+    public function __construct(ParameterBagInterface $parameterBag)
+    {
+        $this->centerRequired = $parameterBag->get('chill_person')['validation']['center_required'];
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function validate($person, Constraint $constraint)
+    {
+        if (!$person instanceof Person) {
+            throw new UnexpectedTypeException($constraint, Person::class);
+        }
+
+        if (!$this->centerRequired) {
+            return;
+        }
+
+        if (NULL === $person->getCenter()) {
+            $this
+                ->context
+                ->buildViolation($constraint->message)
+                ->atPath('center')
+                ->addViolation()
+                ;
+        }
+    }
+}