doctrine / mongodb-odm

lib/Doctrine/ODM/MongoDB/Mapping/ClassMetadata.php

<?php

namespace Doctrine\ODM\MongoDB\Mapping;

use Doctrine\Instantiator\Instantiator;

/**
 * A <tt>ClassMetadata</tt> instance holds all the object-document mapping metadata
 * of a document and it's references.
 *
 * Once populated, ClassMetadata instances are usually cached in a serialized form.
 *
 * <b>IMPORTANT NOTE:</b>
 *
 * The fields of this class are only public for 2 reasons:
 * 1) To allow fast READ access.
 * 2) To drastically reduce the size of a serialized instance (private/protected members
 *    get the whole class name, namespace inclusive, prepended to every property in
 *    the serialized representation).
 *
 * @since       1.0
 */
class ClassMetadata extends ClassMetadataInfo
{
    /**
     * The ReflectionProperty instances of the mapped class.
     *
     * @var \ReflectionProperty[]
     */
    public $reflFields = array();

    /**
     * @var \Doctrine\Instantiator\InstantiatorInterface|null
     */
    private $instantiator;

    /**
     * Initializes a new ClassMetadata instance that will hold the object-document mapping
     * metadata of the class with the given name.
     *
     * @param string $documentName The name of the document class the new instance is used for.
     */
    public function __construct($documentName)
    {
        parent::__construct($documentName);
        $this->reflClass = new \ReflectionClass($documentName);
        $this->namespace = $this->reflClass->getNamespaceName();
        $this->setCollection($this->reflClass->getShortName());
        $this->instantiator = new Instantiator();
    }

    /**
     * Map a field.
     *
     * @param array $mapping The mapping information.
     * @return void
     */
    public function mapField(array $mapping)
    {
        $mapping = parent::mapField($mapping);

        $reflProp = $this->reflClass->getProperty($mapping['fieldName']);
        $reflProp->setAccessible(true);
        $this->reflFields[$mapping['fieldName']] = $reflProp;
    }

    /**
     * Determines which fields get serialized.
     *
     * It is only serialized what is necessary for best unserialization performance.
     * That means any metadata properties that are not set or empty or simply have
     * their default value are NOT serialized.
     *
     * Parts that are also NOT serialized because they can not be properly unserialized:
     *      - reflClass (ReflectionClass)
     *      - reflFields (ReflectionProperty array)
     *
     * @return array The names of all the fields that should be serialized.
     */
    public function __sleep()
    {
        // This metadata is always serialized/cached.
        $serialized = array(
            'fieldMappings',
            'associationMappings',
            'identifier',
            'name',
            'namespace', // TODO: REMOVE
            'db',
            'collection',
            'readPreference',
            'readPreferenceTags',
            'writeConcern',
            'rootDocumentName',
            'generatorType',
            'generatorOptions',
            'idGenerator',
            'indexes',
            'shardKey',
        );

        // The rest of the metadata is only serialized if necessary.
        if ($this->changeTrackingPolicy != self::CHANGETRACKING_DEFERRED_IMPLICIT) {
            $serialized[] = 'changeTrackingPolicy';
        }

        if ($this->customRepositoryClassName) {
            $serialized[] = 'customRepositoryClassName';
        }

        if ($this->inheritanceType != self::INHERITANCE_TYPE_NONE || $this->discriminatorField !== null) {
            $serialized[] = 'inheritanceType';
            $serialized[] = 'discriminatorField';
            $serialized[] = 'discriminatorValue';
            $serialized[] = 'discriminatorMap';
            $serialized[] = 'defaultDiscriminatorValue';
            $serialized[] = 'parentClasses';
            $serialized[] = 'subClasses';
        }

        if ($this->isMappedSuperclass) {
            $serialized[] = 'isMappedSuperclass';
        }

        if ($this->isEmbeddedDocument) {
            $serialized[] = 'isEmbeddedDocument';
        }

        if ($this->isQueryResultDocument) {
            $serialized[] = 'isQueryResultDocument';
        }

        if ($this->isVersioned) {
            $serialized[] = 'isVersioned';
            $serialized[] = 'versionField';
        }

        if ($this->lifecycleCallbacks) {
            $serialized[] = 'lifecycleCallbacks';
        }

        if ($this->slaveOkay) {

The property Doctrine\ODM\MongoDB\Mapping\ClassMetadataInfo::$slaveOkay has been deprecated with message: in version 1.2 and will be removed in 2.0.

            $serialized[] = 'slaveOkay';
        }

        if ($this->collectionCapped) {
            $serialized[] = 'collectionCapped';
            $serialized[] = 'collectionSize';
            $serialized[] = 'collectionMax';
        }

        if ($this->isReadOnly) {
            $serialized[] = 'isReadOnly';
        }

        return $serialized;
    }

    /**
     * Restores some state that can not be serialized/unserialized.
     *
     * @return void
     */
    public function __wakeup()
    {
        // Restore ReflectionClass and properties
        $this->reflClass = new \ReflectionClass($this->name);
        $this->instantiator = $this->instantiator ?: new Instantiator();

        foreach ($this->fieldMappings as $field => $mapping) {
            if (isset($mapping['declared'])) {
                $reflField = new \ReflectionProperty($mapping['declared'], $field);
            } else {
                $reflField = $this->reflClass->getProperty($field);
            }
            $reflField->setAccessible(true);
            $this->reflFields[$field] = $reflField;
        }
    }

    /**
     * Creates a new instance of the mapped class, without invoking the constructor.
     *
     * @return object
     */
    public function newInstance()
    {
        return $this->instantiator->instantiate($this->name);
    }
}