Ported ConstraintValidatorFactory.php to Silex/Pimple

src/Silex/ConstraintValidatorFactory.php

+<?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 Silex;
+
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintValidatorFactoryInterface;
+use Symfony\Component\Validator\ConstraintValidator;
+
+/**
+ * Uses a service container to create constraint validators.
+ *
+ * A constraint validator should be tagged as "validator.constraint_validator"
+ * in the service container and include an "alias" attribute:
+ *
+ *     <service id="some_doctrine_validator">
+ *         <argument type="service" id="doctrine.orm.some_entity_manager" />
+ *         <tag name="validator.constraint_validator" alias="some_alias" />
+ *     </service>
+ *
+ * A constraint may then return this alias in its validatedBy() method:
+ *
+ *     public function validatedBy()
+ *     {
+ *         return 'some_alias';
+ *     }
+ *
+ * @author Kris Wallsmith <kris@symfony.com>
+ */
+class ConstraintValidatorFactory implements ConstraintValidatorFactoryInterface
+{
+    protected $container;
+    protected $validators;
+
+    /**
+     * Constructor.
+     *
+     * @param array $validators An array of validators
+     */
+    public function __construct($container, array $validators = array())
+    {
+        $this->container = $container;
+        $this->validators = $validators;
+    }
+
+    /**
+     * Returns the validator for the supplied constraint.
+     *
+     * @param Constraint $constraint A constraint
+     *
+     * @return ConstraintValidator A validator for the supplied constraint
+     */
+    public function getInstance(Constraint $constraint)
+    {
+        $name = $constraint->validatedBy();
+
+        if (!isset($this->validators[$name])) {
+            $this->validators[$name] = new $name();
+        } elseif (is_string($this->validators[$name])) {
+            $this->validators[$name] = $this->container[$this->validators[$name]];
+        }
+
+        return $this->validators[$name];
+    }
+}
\ No newline at end of file