ConfigImporterEvent.php

<?php

namespace Drupal\Core\Config;

use Symfony\Component\EventDispatcher\Event;
class ConfigImporterEvent extends Event {
    
    /**
     * Configuration import object.
     *
     * @var \Drupal\Core\Config\ConfigImporter
     */
    protected $configImporter;
    
    /**
     * Constructs ConfigImporterEvent.
     *
     * @param \Drupal\Core\Config\ConfigImporter $config_importer
     *   A config import object to notify listeners about.
     */
    public function __construct(ConfigImporter $config_importer) {
        $this->configImporter = $config_importer;
    }
    
    /**
     * Gets the config import object.
     *
     * @return \Drupal\Core\Config\ConfigImporter
     *   The ConfigImporter object.
     */
    public function getConfigImporter() {
        return $this->configImporter;
    }
    
    /**
     * Gets the list of changes that will be imported.
     *
     * @param string $op
     *   (optional) A change operation. Either delete, create or update. If
     *   supplied the returned list will be limited to this operation.
     * @param string $collection
     *   (optional) The collection to get the changelist for. Defaults to the
     *   default collection.
     *
     * @return array
     *   An array of config changes that are yet to be imported.
     *
     * @see \Drupal\Core\Config\StorageComparerInterface::getChangelist()
     */
    public function getChangelist($op = NULL, $collection = StorageInterface::DEFAULT_COLLECTION) {
        return $this->configImporter
            ->getStorageComparer()
            ->getChangelist($op, $collection);
    }

}