EDIT

 * @return object

 *   A CDM Pager object

 * Sends a http GET request to the generic page method which allows for filtering entities by Restrictions.

 *

 * @param $cdm_entity_type

 * @param array $restrictions

 *   An array of Restriction objects

 * @param array $init_strategy

 *   The init strategy to initialize the entity beans while being loaded from the

 *   persistent storage by the cdm

 * @param int $page_size

 *   The maximum number of entities returned per page.

 *   The default page size as configured in the cdm server

 *   will be used if set to NULL

 *   to return all entities in a single page).

 * @param int $page_index

 *   The number of the page to be returned, the first page has the

 *   pageNumber = 0

 *

 * @return object

 *   A CDM Pager object

 *

 */

function cdm_ws_page_by_restriction($cdm_entity_type, array $restrictions, array $init_strategy, $page_size, $page_index) {

  $restrictions_json = array(); // json_encode($restrictions);

  foreach ($restrictions as $restr){

    $restrictions_json[] = json_encode($restr);

  }

  return cdm_ws_page(

      'portal/' . cdm_ws_base_uri($cdm_entity_type),

      $page_size,

      $page_index,

      array(

        'restriction' => $restrictions_json,

        'initStrategy' => $init_strategy

      ),

      "GET"

    );

}

/**

 * Fetches all entities returned by the the generic page method for the Restrictions applied as filter.

 *

 * @param $cdm_entity_type

 * @param array $restrictions

 *   An array of Restriction objects

 * @param array $init_strategy

 *   The init strategy to initialize the entity beans while being loaded from the

 *   persistent storage by the cdm

 * @param int $page_size

 *   The maximum number of entities returned per page.

 *   The default page size as configured in the cdm server

 *   will be used if set to NULL

 *   to return all entities in a single page).

 * @param int $page_index

 *   The number of the page to be returned, the first page has the

 *   pageNumber = 0

 *

 * @return array

 *   A array of CDM entities

 *

 */

function cdm_ws_fetch_all_by_restriction($cdm_entity_type, array $restrictions, array $init_strategy){

  $page_index = 0;

  // using a bigger page size to avoid to many multiple requests

  $page_size = 500;

  $entities = array();

  while ($page_index !== FALSE && $page_index < 1){

    $pager =  cdm_ws_page_by_restriction($cdm_entity_type, $restrictions, $init_strategy, $page_size, $page_index);

    if(isset($pager->records) && is_array($pager->records)) {

      $entities = array_merge($entities, $pager->records);

      if(!empty($pager->nextIndex)){

        $page_index = $pager->nextIndex;

      } else {

        $page_index = FALSE;

      }

    } else {

      $page_index = FALSE;

    }

  }

  return $entities;

}

  /**