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<?php
/**
 * @file
 * Contains \Drupal\Core\Field\ChangedFieldItemList.
 */
namespace Drupal\Core\Field;
use Drupal\Core\Access\AccessResult;
use Drupal\Core\Session\AccountInterface;
/**
 * Defines a item list class for changed fields.
 */
class ChangedFieldItemList extends FieldItemList {
  /**
   * {@inheritdoc}
   */
  public function defaultAccess($operation = 'view', AccountInterface $account = NULL) {
    // It is not possible to edit the changed field.
    return AccessResult::allowedIf($operation !== 'edit');
  }
}