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vendor/symfony/validator/Constraints/UniqueValidator.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Validator\Constraints;
+
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintValidator;
+use Symfony\Component\Validator\Exception\UnexpectedTypeException;
+use Symfony\Component\Validator\Exception\UnexpectedValueException;
+
+/**
+ * @author Yevgeniy Zholkevskiy <zhenya.zholkevskiy@gmail.com>
+ */
+class UniqueValidator extends ConstraintValidator
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function validate($value, Constraint $constraint)
+    {
+        if (!$constraint instanceof Unique) {
+            throw new UnexpectedTypeException($constraint, Unique::class);
+        }
+
+        if (null === $value) {
+            return;
+        }
+
+        if (!\is_array($value) && !$value instanceof \IteratorAggregate) {
+            throw new UnexpectedValueException($value, 'array|IteratorAggregate');
+        }
+
+        $collectionElements = [];
+        $normalizer = $this->getNormalizer($constraint);
+        foreach ($value as $element) {
+            $element = $normalizer($element);
+
+            if (\in_array($element, $collectionElements, true)) {
+                $this->context->buildViolation($constraint->message)
+                    ->setParameter('{{ value }}', $this->formatValue($value))
+                    ->setCode(Unique::IS_NOT_UNIQUE)
+                    ->addViolation();
+
+                return;
+            }
+            $collectionElements[] = $element;
+        }
+    }
+
+    private function getNormalizer(Unique $unique): callable
+    {
+        if (null === $unique->normalizer) {
+            return static function ($value) {
+                return $value;
+            };
+        }
+
+        return $unique->normalizer;
+    }
+}