<?php

namespace Drupal\Core\Action;

use Drupal\Component\Plugin\CategorizingPluginManagerInterface;
use Drupal\Core\Cache\CacheBackendInterface;
use Drupal\Core\Extension\ModuleHandlerInterface;
use Drupal\Core\Plugin\CategorizingPluginManagerTrait;
use Drupal\Core\Plugin\DefaultPluginManager;

/**
 * Provides an Action plugin manager.
 *
 * @see \Drupal\Core\Annotation\Action
 * @see \Drupal\Core\Action\ActionInterface
 * @see \Drupal\Core\Action\ActionBase
 * @see plugin_api
 */
class ActionManager extends DefaultPluginManager implements CategorizingPluginManagerInterface {

  use CategorizingPluginManagerTrait;

  /**
   * Constructs a new class instance.
   *
   * @param \Traversable $namespaces
   *   An object that implements \Traversable which contains the root paths
   *   keyed by the corresponding namespace to look for plugin implementations.
   * @param \Drupal\Core\Cache\CacheBackendInterface $cache_backend
   *   Cache backend instance to use.
   * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
   *   The module handler to invoke the alter hook with.
   */
  public function __construct(\Traversable $namespaces, CacheBackendInterface $cache_backend, ModuleHandlerInterface $module_handler) {
    parent::__construct('Plugin/Action', $namespaces, $module_handler, 'Drupal\Core\Action\ActionInterface', 'Drupal\Core\Annotation\Action');
    $this->alterInfo('action_info');
    $this->setCacheBackend($cache_backend, 'action_info');
  }

  /**
   * Gets the plugin definitions for this entity type.
   *
   * @param string $type
   *   The entity type name.
   *
   * @return array
   *   An array of plugin definitions for this entity type.
   */
  public function getDefinitionsByType($type) {
    return array_filter($this->getDefinitions(), function ($definition) use ($type) {
      return $definition['type'] === $type;
    });
  }

}