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<?php |
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/* |
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* This file is part of the PommProject/ModelManager package. |
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* |
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* (c) 2014 - 2015 Grégoire HUBERT <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace PommProject\ModelManager\Model; |
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use PommProject\ModelManager\Model\FlexibleEntity\FlexibleEntityInterface; |
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/** |
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* IdentityMapper |
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* |
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* Cache for FlexibleEntityInterface instances to ensure there are no different |
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* instances for the same data. |
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* |
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* @package ModelManager |
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* @copyright 2014 - 2015 Grégoire HUBERT |
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* @author Grégoire HUBERT |
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* @license X11 {@link http://opensource.org/licenses/mit-license.php} |
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*/ |
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class IdentityMapper |
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{ |
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/** |
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* @var FlexibleEntityInterface[] |
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*/ |
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protected $instances = []; |
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/** |
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* getSignature |
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* |
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* Compute a unique signature upon entity's values in its primary key. If |
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* an empty primary key is provided, null is returned. |
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* |
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* @static |
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* @access public |
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* @param FlexibleEntityInterface $entity |
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* @param array $primary_key |
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* @return string |
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*/ |
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public static function getSignature(FlexibleEntityInterface $entity, array $primary_key) |
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{ |
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if (count($primary_key) === 0) { |
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return null; |
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} |
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return sha1(sprintf("%s|%s", serialize($entity->fields($primary_key)), get_class($entity))); |
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} |
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/** |
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* fetch |
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* |
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* Pool FlexibleEntityInterface instances and update them if necessary. |
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* |
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* @access public |
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* @param FlexibleEntityInterface $entity |
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* @param array $primary_key |
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* @return FlexibleEntityInterface |
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*/ |
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public function fetch(FlexibleEntityInterface $entity, array $primary_key) |
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{ |
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$signature = self::getSignature($entity, $primary_key); |
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if ($signature === null) { |
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return $entity; |
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} |
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if (!array_key_exists($signature, $this->instances)) { |
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$this->instances[$signature] = $entity; |
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$entity->status(FlexibleEntityInterface::STATUS_EXIST); |
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} else { |
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$this->instances[$signature]->hydrate($entity->fields()); |
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} |
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return $this->instances[$signature]; |
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} |
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/** |
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* clear |
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* |
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* Flush instances from the identity mapper. |
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* |
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* @access public |
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* @return IdentityMapper $this |
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*/ |
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public function clear() |
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{ |
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$this->instances = []; |
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return $this; |
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} |
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} |
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pomm-project /
ModelManager
