question: return a singleton instance of this class concode_field_sep AtmosAPIFacade instance concode_elem_sep Logger LOG concode_elem_sep AtmosApi client concode_field_sep AtmosResult move concode_elem_sep void downloadFilesInFolder concode_elem_sep ObjectId putSingleFile concode_elem_sep AtmosResult get concode_elem_sep AtmosResult del concode_elem_sep void downloadSingleFile concode_elem_sep AtmosResult put
target: AtmosAPIFacade function ( AtmosApi arg0 ) { if ( instance == null ) { instance = new AtmosAPIFacade ( ) ; AtmosAPIFacade . arg0 = arg0 ; } return instance ; }