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vendor/symfony/validator/Constraints/Composite.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\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, array $groups = null, $payload = null)
+    {
+        parent::__construct($options, $groups, $payload);
+
+        $this->initializeNestedConstraints();
+
+        /* @var Constraint[] $nestedConstraints */
+        $compositeOption = $this->getCompositeOption();
+        $nestedConstraints = $this->$compositeOption;
+
+        if (!\is_array($nestedConstraints)) {
+            $nestedConstraints = [$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".', $constraint, static::class));
+            }
+
+            if ($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.', static::class));
+            }
+        }
+
+        if (!isset(((array) $this)['groups'])) {
+            $mergedGroups = [];
+
+            foreach ($nestedConstraints as $constraint) {
+                foreach ($constraint->groups as $group) {
+                    $mergedGroups[$group] = true;
+                }
+            }
+
+            // prevent empty composite constraint to have empty groups
+            $this->groups = array_keys($mergedGroups) ?: [self::DEFAULT_GROUP];
+            $this->$compositeOption = $nestedConstraints;
+
+            return;
+        }
+
+        foreach ($nestedConstraints as $constraint) {
+            if (isset(((array) $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('", "', $excessGroups), get_debug_type($constraint), static::class));
+                }
+            } else {
+                $constraint->groups = $this->groups;
+            }
+        }
+
+        $this->$compositeOption = $nestedConstraints;
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * Implicit group names are forwarded to nested constraints.
+     */
+    public function addImplicitGroupName(string $group)
+    {
+        parent::addImplicitGroupName($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
+     */
+    abstract protected function getCompositeOption();
+
+    /**
+     * @internal Used by metadata
+     *
+     * @return Constraint[]
+     */
+    public function getNestedConstraints()
+    {
+        /* @var Constraint[] $nestedConstraints */
+        return $this->{$this->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()
+    {
+    }
+}