pages/preprints/index.php

<?php
 
switch ($op) {
   case 'index':
      define('HANDLER_CLASS', 'PreprintsHandler');
      import('pages.preprints.PreprintsHandler');
      break;
   case 'category':
   case 'fullSize':
   case 'thumbnail':
      define('HANDLER_CLASS', 'PKPCatalogHandler');
      import('lib.pkp.pages.catalog.PKPCatalogHandler');
      break;
   case 'section':
      define('HANDLER_CLASS', 'SectionsHandler');
      import('pages.preprints.SectionsHandler');
      break;
}