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vendor/symfony/validator/Mapping/Factory/BlackHoleMetadataFactory.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\Mapping\Factory;
+
+use Symfony\Component\Validator\Exception\LogicException;
+
+/**
+ * Metadata factory that does not store metadata.
+ *
+ * This implementation is useful if you want to validate values against
+ * constraints only and you don't need to add constraints to classes and
+ * properties.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class BlackHoleMetadataFactory implements MetadataFactoryInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function getMetadataFor($value)
+    {
+        throw new LogicException('This class does not support metadata.');
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function hasMetadataFor($value)
+    {
+        return false;
+    }
+}

vendor/symfony/validator/Mapping/Factory/LazyLoadingMetadataFactory.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\Mapping\Factory;
+
+use Psr\Cache\CacheItemPoolInterface;
+use Symfony\Component\Validator\Exception\NoSuchMetadataException;
+use Symfony\Component\Validator\Mapping\ClassMetadata;
+use Symfony\Component\Validator\Mapping\Loader\LoaderInterface;
+
+/**
+ * Creates new {@link ClassMetadataInterface} instances.
+ *
+ * Whenever {@link getMetadataFor()} is called for the first time with a given
+ * class name or object of that class, a new metadata instance is created and
+ * returned. On subsequent requests for the same class, the same metadata
+ * instance will be returned.
+ *
+ * You can optionally pass a {@link LoaderInterface} instance to the constructor.
+ * Whenever a new metadata instance is created, it is passed to the loader,
+ * which can configure the metadata based on configuration loaded from the
+ * filesystem or a database. If you want to use multiple loaders, wrap them in a
+ * {@link LoaderChain}.
+ *
+ * You can also optionally pass a {@link CacheInterface} instance to the
+ * constructor. This cache will be used for persisting the generated metadata
+ * between multiple PHP requests.
+ *
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ */
+class LazyLoadingMetadataFactory implements MetadataFactoryInterface
+{
+    protected $loader;
+    protected $cache;
+
+    /**
+     * The loaded metadata, indexed by class name.
+     *
+     * @var ClassMetadata[]
+     */
+    protected $loadedClasses = [];
+
+    public function __construct(LoaderInterface $loader = null, CacheItemPoolInterface $cache = null)
+    {
+        $this->loader = $loader;
+        $this->cache = $cache;
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * If the method was called with the same class name (or an object of that
+     * class) before, the same metadata instance is returned.
+     *
+     * If the factory was configured with a cache, this method will first look
+     * for an existing metadata instance in the cache. If an existing instance
+     * is found, it will be returned without further ado.
+     *
+     * Otherwise, a new metadata instance is created. If the factory was
+     * configured with a loader, the metadata is passed to the
+     * {@link LoaderInterface::loadClassMetadata()} method for further
+     * configuration. At last, the new object is returned.
+     */
+    public function getMetadataFor($value)
+    {
+        if (!\is_object($value) && !\is_string($value)) {
+            throw new NoSuchMetadataException(sprintf('Cannot create metadata for non-objects. Got: "%s".', get_debug_type($value)));
+        }
+
+        $class = ltrim(\is_object($value) ? \get_class($value) : $value, '\\');
+
+        if (isset($this->loadedClasses[$class])) {
+            return $this->loadedClasses[$class];
+        }
+
+        if (!class_exists($class) && !interface_exists($class, false)) {
+            throw new NoSuchMetadataException(sprintf('The class or interface "%s" does not exist.', $class));
+        }
+
+        $cacheItem = null === $this->cache ? null : $this->cache->getItem($this->escapeClassName($class));
+        if ($cacheItem && $cacheItem->isHit()) {
+            $metadata = $cacheItem->get();
+
+            // Include constraints from the parent class
+            $this->mergeConstraints($metadata);
+
+            return $this->loadedClasses[$class] = $metadata;
+        }
+
+        $metadata = new ClassMetadata($class);
+
+        if (null !== $this->loader) {
+            $this->loader->loadClassMetadata($metadata);
+        }
+
+        if (null !== $cacheItem) {
+            $this->cache->save($cacheItem->set($metadata));
+        }
+
+        // Include constraints from the parent class
+        $this->mergeConstraints($metadata);
+
+        return $this->loadedClasses[$class] = $metadata;
+    }
+
+    private function mergeConstraints(ClassMetadata $metadata)
+    {
+        if ($metadata->getReflectionClass()->isInterface()) {
+            return;
+        }
+
+        // Include constraints from the parent class
+        if ($parent = $metadata->getReflectionClass()->getParentClass()) {
+            $metadata->mergeConstraints($this->getMetadataFor($parent->name));
+        }
+
+        // Include constraints from all directly implemented interfaces
+        foreach ($metadata->getReflectionClass()->getInterfaces() as $interface) {
+            if ('Symfony\Component\Validator\GroupSequenceProviderInterface' === $interface->name) {
+                continue;
+            }
+
+            if ($parent && \in_array($interface->getName(), $parent->getInterfaceNames(), true)) {
+                continue;
+            }
+
+            $metadata->mergeConstraints($this->getMetadataFor($interface->name));
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function hasMetadataFor($value)
+    {
+        if (!\is_object($value) && !\is_string($value)) {
+            return false;
+        }
+
+        $class = ltrim(\is_object($value) ? \get_class($value) : $value, '\\');
+
+        return class_exists($class) || interface_exists($class, false);
+    }
+
+    /**
+     * Replaces backslashes by dots in a class name.
+     */
+    private function escapeClassName(string $class): string
+    {
+        if (str_contains($class, '@')) {
+            // anonymous class: replace all PSR6-reserved characters
+            return str_replace(["\0", '\\', '/', '@', ':', '{', '}', '(', ')'], '.', $class);
+        }
+
+        return str_replace('\\', '.', $class);
+    }
+}

vendor/symfony/validator/Mapping/Factory/MetadataFactoryInterface.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\Mapping\Factory;
+
+use Symfony\Component\Validator\Exception\NoSuchMetadataException;
+use Symfony\Component\Validator\Mapping\MetadataInterface;
+
+/**
+ * Returns {@link \Symfony\Component\Validator\Mapping\MetadataInterface} instances for values.
+ *
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ */
+interface MetadataFactoryInterface
+{
+    /**
+     * Returns the metadata for the given value.
+     *
+     * @param mixed $value Some value
+     *
+     * @return MetadataInterface
+     *
+     * @throws NoSuchMetadataException If no metadata exists for the given value
+     */
+    public function getMetadataFor($value);
+
+    /**
+     * Returns whether the class is able to return metadata for the given value.
+     *
+     * @param mixed $value Some value
+     *
+     * @return bool
+     */
+    public function hasMetadataFor($value);
+}