controllers/grid/files/fileList/linkAction/DownloadAllLinkAction.inc.php

<?php
import('lib.pkp.classes.linkAction.LinkAction');

class DownloadAllLinkAction extends LinkAction {

   function DownloadAllLinkAction(&$request, $actionArgs, $files) {
      // Instantiate the redirect action request.
      $router =& $request->getRouter();
      $filesIdsAndRevisions = $this->_getFilesIdsAndRevisions($files);
      $actionArgs['filesIdsAndRevisions'] = $filesIdsAndRevisions;
      import('lib.pkp.classes.linkAction.request.PostAndRedirectAction');
      $redirectRequest = new PostAndRedirectAction($router->url($request, null, 'api.file.FileApiHandler', 'recordDownload', null, $actionArgs),
         $router->url($request, null, 'api.file.FileApiHandler', 'downloadAllFiles', null, $actionArgs));

      // Configure the link action.
      parent::LinkAction('downloadAll', $redirectRequest, __('submission.files.downloadAll'), 'getPackage');
   }


   //
   // Private helper methods.
   //
   function _getFilesIdsAndRevisions($files) {
      $filesIdsAndRevisions = null;
      foreach ($files as $fileData) {
         $file =& $fileData['submissionFile'];
         $fileId = $file->getFileId();
         $revision = $file->getRevision();
         $filesIdsAndRevisions .= $fileId . '-' . $revision . ';';
         unset($file);
      }

      return $filesIdsAndRevisions;
   }
}

?>