--- /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\Constraint;
+use Symfony\Component\Validator\Exception\ConstraintDefinitionException;
+
+/**
+ * A constraint that is composed of other constraints.
+ *
+ * You should never use the nested constraint instances anywhere else, because
+ * their groups are adapted when passed to the constructor of this class.
+ *
+ * If you want to create your own composite constraint, extend this class and
+ * let {@link getCompositeOption()} return the name of the property which
+ * contains the nested constraints.
+ *
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ */
+abstract class Composite extends Constraint
+{
+ /**
+ * {@inheritdoc}
+ *
+ * The groups of the composite and its nested constraints are made
+ * consistent using the following strategy:
+ *
+ * - If groups are passed explicitly to the composite constraint, but
+ * not to the nested constraints, the options of the composite
+ * constraint are copied to the nested constraints;
+ *
+ * - If groups are passed explicitly to the nested constraints, but not
+ * to the composite constraint, the groups of all nested constraints
+ * are merged and used as groups for the composite constraint;
+ *
+ * - If groups are passed explicitly to both the composite and its nested
+ * constraints, the groups of the nested constraints must be a subset
+ * of the groups of the composite constraint. If not, a
+ * {@link ConstraintDefinitionException} is thrown.
+ *
+ * All this is done in the constructor, because constraints can then be
+ * cached. When constraints are loaded from the cache, no more group
+ * checks need to be done.
+ */
+ public function __construct($options = null)
+ {
+ parent::__construct($options);
+
+ $this->initializeNestedConstraints();
+
+ /* @var Constraint[] $nestedConstraints */
+ $compositeOption = $this->getCompositeOption();
+ $nestedConstraints = $this->$compositeOption;
+
+ if (!is_array($nestedConstraints)) {
+ $nestedConstraints = array($nestedConstraints);
+ }
+
+ foreach ($nestedConstraints as $constraint) {
+ if (!$constraint instanceof Constraint) {
+ if (is_object($constraint)) {
+ $constraint = get_class($constraint);
+ }
+
+ throw new ConstraintDefinitionException(sprintf('The value %s is not an instance of Constraint in constraint %s', $constraint, get_class($this)));
+ }
+
+ if ($constraint instanceof Valid) {
+ throw new ConstraintDefinitionException(sprintf('The constraint Valid cannot be nested inside constraint %s. You can only declare the Valid constraint directly on a field or method.', get_class($this)));
+ }
+ }
+
+ if (!property_exists($this, 'groups')) {
+ $mergedGroups = array();
+
+ foreach ($nestedConstraints as $constraint) {
+ foreach ($constraint->groups as $group) {
+ $mergedGroups[$group] = true;
+ }
+ }
+
+ $this->groups = array_keys($mergedGroups);
+ $this->$compositeOption = $nestedConstraints;
+
+ return;
+ }
+
+ foreach ($nestedConstraints as $constraint) {
+ if (property_exists($constraint, 'groups')) {
+ $excessGroups = array_diff($constraint->groups, $this->groups);
+
+ if (count($excessGroups) > 0) {
+ throw new ConstraintDefinitionException(sprintf(
+ 'The group(s) "%s" passed to the constraint %s '.
+ 'should also be passed to its containing constraint %s',
+ implode('", "', $excessGroups),
+ get_class($constraint),
+ get_class($this)
+ ));
+ }
+ } else {
+ $constraint->groups = $this->groups;
+ }
+ }
+
+ $this->$compositeOption = $nestedConstraints;
+ }
+
+ /**
+ * {@inheritdoc}
+ *
+ * Implicit group names are forwarded to nested constraints.
+ *
+ * @param string $group
+ */
+ public function addImplicitGroupName($group)
+ {
+ parent::addImplicitGroupName($group);
+
+ /** @var Constraint[] $nestedConstraints */
+ $nestedConstraints = $this->{$this->getCompositeOption()};
+
+ foreach ($nestedConstraints as $constraint) {
+ $constraint->addImplicitGroupName($group);
+ }
+ }
+
+ /**
+ * Returns the name of the property that contains the nested constraints.
+ *
+ * @return string The property name
+ */
+ abstract protected function getCompositeOption();
+
+ /**
+ * Initializes the nested constraints.
+ *
+ * This method can be overwritten in subclasses to clean up the nested
+ * constraints passed to the constructor.
+ *
+ * @see Collection::initializeNestedConstraints()
+ */
+ protected function initializeNestedConstraints()
+ {
+ }
+}