Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\Component\Plugin\Derivative;
Chris@0: 
Chris@0: /**
Chris@0:  * Provides a basic deriver.
Chris@0:  */
Chris@0: abstract class DeriverBase implements DeriverInterface {
Chris@0: 
Chris@0:   /**
Chris@0:    * List of derivative definitions.
Chris@0:    *
Chris@0:    * @var array
Chris@0:    */
Chris@0:   protected $derivatives = [];
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function getDerivativeDefinition($derivative_id, $base_plugin_definition) {
Chris@0:     if (!empty($this->derivatives) && !empty($this->derivatives[$derivative_id])) {
Chris@0:       return $this->derivatives[$derivative_id];
Chris@0:     }
Chris@0:     $this->getDerivativeDefinitions($base_plugin_definition);
Chris@0:     return $this->derivatives[$derivative_id];
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function getDerivativeDefinitions($base_plugin_definition) {
Chris@0:     return $this->derivatives;
Chris@0:   }
Chris@0: 
Chris@0: }