Exists.php

<?php

// phpcs:ignoreFile
declare (strict_types=1);
namespace Drupal\Core\Config\Action;

use Drupal\Core\Config\Entity\ConfigEntityInterface;

/**
 * @internal
 *   This API is experimental.
 */
enum Exists
{
  case ErrorIfExists;
  case ErrorIfNotExists;
  case ReturnEarlyIfExists;
  case ReturnEarlyIfNotExists;
  
  /**
   * Determines if an action should return early depending on $entity.
   *
   * @param string $configName
   *   The config name supplied to the action.
   * @param \Drupal\Core\Config\Entity\ConfigEntityInterface|null $entity
   *   The entity, if it exists.
   *
   * @return bool
   *   TRUE if the action should return early, FALSE if not.
   *
   * @throws \Drupal\Core\Config\Action\ConfigActionException
   *   Thrown depending on $entity and the value of $this.
   */
  public function returnEarly(string $configName, ?ConfigEntityInterface $entity) : bool {
    return match (TRUE) {  $this === self::ReturnEarlyIfExists && $entity !== NULL, $this === self::ReturnEarlyIfNotExists && $entity === NULL => TRUE,
      $this === self::ErrorIfExists && $entity !== NULL => throw new ConfigActionException(sprintf('Entity %s exists', $configName)),
      $this === self::ErrorIfNotExists && $entity === NULL => throw new ConfigActionException(sprintf('Entity %s does not exist', $configName)),
      default => FALSE,
    
    };
  }
}