eZ\Publish\Core\REST\Common\Input\ParserTools::parseDefaultSortField PHP Method

    public function parseDefaultSortField($defaultSortFieldString)
    {
        switch ($defaultSortFieldString) {
            case 'PATH':
                return Values\Content\Location::SORT_FIELD_PATH;
            case 'PUBLISHED':
                return Values\Content\Location::SORT_FIELD_PUBLISHED;
            case 'MODIFIED':
                return Values\Content\Location::SORT_FIELD_MODIFIED;
            case 'SECTION':
                return Values\Content\Location::SORT_FIELD_SECTION;
            case 'DEPTH':
                return Values\Content\Location::SORT_FIELD_DEPTH;
            case 'CLASS_IDENTIFIER':
                return Values\Content\Location::SORT_FIELD_CLASS_IDENTIFIER;
            case 'CLASS_NAME':
                return Values\Content\Location::SORT_FIELD_CLASS_NAME;
            case 'PRIORITY':
                return Values\Content\Location::SORT_FIELD_PRIORITY;
            case 'NAME':
                return Values\Content\Location::SORT_FIELD_NAME;
            case 'MODIFIED_SUBNODE':
                return Values\Content\Location::SORT_FIELD_MODIFIED_SUBNODE;
            case 'NODE_ID':
                return Values\Content\Location::SORT_FIELD_NODE_ID;
            case 'CONTENTOBJECT_ID':
                return Values\Content\Location::SORT_FIELD_CONTENTOBJECT_ID;
        }
        throw new \RuntimeException("Unknown default sort field: '{$defaultSortFieldString}'.");
    }

 /**
  * Parse input structure
  *
  * @param array $data
  * @param \eZ\Publish\Core\REST\Common\Input\ParsingDispatcher $parsingDispatcher
  *
  * @return \eZ\Publish\API\Repository\Values\Content\LocationCreateStruct
  */
 public function parse(array $data, ParsingDispatcher $parsingDispatcher)
 {
     if (!array_key_exists('ParentLocation', $data) || !is_array($data['ParentLocation'])) {
         throw new Exceptions\Parser("Missing or invalid 'ParentLocation' element for LocationCreate.");
     }
     if (!array_key_exists('_href', $data['ParentLocation'])) {
         throw new Exceptions\Parser("Missing '_href' attribute for ParentLocation element in LocationCreate.");
     }
     $locationHrefParts = explode('/', $this->requestParser->parseHref($data['ParentLocation']['_href'], 'locationPath'));
     $locationCreateStruct = $this->locationService->newLocationCreateStruct(array_pop($locationHrefParts));
     if (array_key_exists('priority', $data)) {
         $locationCreateStruct->priority = (int) $data['priority'];
     }
     if (array_key_exists('hidden', $data)) {
         $locationCreateStruct->hidden = $this->parserTools->parseBooleanValue($data['hidden']);
     }
     if (array_key_exists('remoteId', $data)) {
         $locationCreateStruct->remoteId = $data['remoteId'];
     }
     if (!array_key_exists('sortField', $data)) {
         throw new Exceptions\Parser("Missing 'sortField' element for LocationCreate.");
     }
     $locationCreateStruct->sortField = $this->parserTools->parseDefaultSortField($data['sortField']);
     if (!array_key_exists('sortOrder', $data)) {
         throw new Exceptions\Parser("Missing 'sortOrder' element for LocationCreate.");
     }
     $locationCreateStruct->sortOrder = $this->parserTools->parseDefaultSortOrder($data['sortOrder']);
     return $locationCreateStruct;
 }