ContextAwarePluginManagerTrait.php

<?php

namespace Drupal\Core\Plugin\Context;


/**
 * Provides a trait for plugin managers that support context-aware plugins.
 */
trait ContextAwarePluginManagerTrait {

  /**
   * Wraps the context handler.
   *
   * @return \Drupal\Core\Plugin\Context\ContextHandlerInterface
   */
  protected function contextHandler() {
    return \Drupal::service('context.handler');
  }

  /**
   * See \Drupal\Core\Plugin\Context\ContextAwarePluginManagerInterface::getDefinitionsForContexts().
   */
  public function getDefinitionsForContexts(array $contexts = []) {
    return $this
      ->contextHandler()
      ->filterPluginDefinitionsByContexts($contexts, $this
      ->getDefinitions());
  }

  /**
   * See \Drupal\Component\Plugin\Discovery\DiscoveryInterface::getDefinitions().
   */
  public abstract function getDefinitions();

}