--- /dev/null
+<?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\Context\ExecutionContextInterface;
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintValidator;
+use Symfony\Component\Validator\Exception\UnexpectedTypeException;
+
+/**
+ * Provides a base class for the validation of property comparisons.
+ *
+ * @author Daniel Holmes <daniel@danielholmes.org>
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ */
+abstract class AbstractComparisonValidator extends ConstraintValidator
+{
+ /**
+ * {@inheritdoc}
+ */
+ public function validate($value, Constraint $constraint)
+ {
+ if (!$constraint instanceof AbstractComparison) {
+ throw new UnexpectedTypeException($constraint, __NAMESPACE__.'\AbstractComparison');
+ }
+
+ if (null === $value) {
+ return;
+ }
+
+ $comparedValue = $constraint->value;
+
+ // Convert strings to DateTimes if comparing another DateTime
+ // This allows to compare with any date/time value supported by
+ // the DateTime constructor:
+ // http://php.net/manual/en/datetime.formats.php
+ if (is_string($comparedValue)) {
+ if ($value instanceof \DateTimeImmutable) {
+ // If $value is immutable, convert the compared value to a
+ // DateTimeImmutable too
+ $comparedValue = new \DatetimeImmutable($comparedValue);
+ } elseif ($value instanceof \DateTime || $value instanceof \DateTimeInterface) {
+ // Otherwise use DateTime
+ $comparedValue = new \DateTime($comparedValue);
+ }
+ }
+
+ if (!$this->compareValues($value, $comparedValue)) {
+ if ($this->context instanceof ExecutionContextInterface) {
+ $this->context->buildViolation($constraint->message)
+ ->setParameter('{{ value }}', $this->formatValue($value, self::OBJECT_TO_STRING | self::PRETTY_DATE))
+ ->setParameter('{{ compared_value }}', $this->formatValue($comparedValue, self::OBJECT_TO_STRING | self::PRETTY_DATE))
+ ->setParameter('{{ compared_value_type }}', $this->formatTypeOf($comparedValue))
+ ->setCode($this->getErrorCode())
+ ->addViolation();
+ } else {
+ $this->buildViolation($constraint->message)
+ ->setParameter('{{ value }}', $this->formatValue($value, self::OBJECT_TO_STRING | self::PRETTY_DATE))
+ ->setParameter('{{ compared_value }}', $this->formatValue($comparedValue, self::OBJECT_TO_STRING | self::PRETTY_DATE))
+ ->setParameter('{{ compared_value_type }}', $this->formatTypeOf($comparedValue))
+ ->setCode($this->getErrorCode())
+ ->addViolation();
+ }
+ }
+ }
+
+ /**
+ * Compares the two given values to find if their relationship is valid.
+ *
+ * @param mixed $value1 The first value to compare
+ * @param mixed $value2 The second value to compare
+ *
+ * @return bool true if the relationship is valid, false otherwise
+ */
+ abstract protected function compareValues($value1, $value2);
+
+ /**
+ * Returns the error code used if the comparison fails.
+ *
+ * @return string|null The error code or `null` if no code should be set
+ */
+ protected function getErrorCode()
+ {
+ }
+}