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#' start a geo-web processing request
#'
#' start is a method for submitting a geo-web processing request.
#'
#' @param .Object a \linkS4class{geojob} object
#' @return A \linkS4class{geojob} object with an active GDP process request.
#'
#' @docType methods
#' @description Start process for \code{\link{geojob}}
#' @title Submit a GDP web processing request
#' @seealso \code{\link{check}}
#' @aliases start
#' @docType methods
#' @export
#' @rdname start-methods
#' @examples
#' wd <- webdata('prism')
#' wg <- webgeom('state::New Hampshire')
#' wp <- webprocess()
#' gj <- geojob()
#' \dontrun{
#' xml(gj) <- XML(wg, wd, wp)
#' url(gj) <- url(wp)
#' gj <- start(gj)
#' }
setGeneric(name="start",def=function(.Object){standardGeneric("start")})
#'@rdname start-methods
#'@export
setMethod(f = "start",signature(.Object = "geojob"),definition = function(.Object){
if (!canStart()){
stop('Cannot start a new geojob until a previous one is completed or is error. ',
'See "check(geojob)"', call.=FALSE)
}
requestXML <- xml(.Object)
data <- genericExecute(url = url(.Object), requestXML)
xmltext <- gcontent(data)
response <- xml2::xml_root(xmltext)
if(xml2::xml_name(response) == "ExceptionReport") {
cancel(.Object)
stop(cat(xml2::xml_text(response)))
} else {
processID <- xml2::xml_attr(response,"statusLocation")
}
id(.Object) <- processID
setJobState("ProcessStarted")
return(.Object)
})
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