Move ValidationException under Validator namespace

[MAILPOET-2437]

lib/Doctrine/Validator/ValidationException.php

@@ -0,0 +1,48 @@
+<?php
+
+namespace MailPoet\Doctrine\Validator;
+
+use MailPoetVendor\Symfony\Component\Validator\ConstraintViolationInterface;
+use MailPoetVendor\Symfony\Component\Validator\ConstraintViolationListInterface;
+
+class ValidationException extends \RuntimeException {
+  /** @var string */
+  private $resource_name;
+
+  /** @var ConstraintViolationListInterface|ConstraintViolationInterface[] */
+  private $violations;
+
+  function __construct($resource_name, ConstraintViolationListInterface $violations) {
+    $this->resource_name = $resource_name;
+    $this->violations = $violations;
+
+    $line_prefix = '  ';
+    $message = "Validation failed for '$resource_name'.\nDetails:\n";
+    $message .= $line_prefix . implode("\n$line_prefix", $this->getErrors());
+    parent::__construct($message);
+  }
+
+  /** @return string */
+  function getResourceName() {
+    return $this->resource_name;
+  }
+
+  /** @return ConstraintViolationListInterface|ConstraintViolationInterface[] */
+  function getViolations() {
+    return $this->violations;
+  }
+
+  /** @return string[] */
+  function getErrors() {
+    $messages = [];
+    foreach ($this->violations as $violation) {
+      $messages[] = $this->formatError($violation);
+    }
+    sort($messages);
+    return $messages;
+  }
+
+  private function formatError(ConstraintViolationInterface $violation) {
+    return '[' . $violation->getPropertyPath() . '] ' . $violation->getMessage();
+  }
+}