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#' @name SDMXREST21RequestBuilder
#' @rdname SDMXREST21RequestBuilder
#' @aliases SDMXREST21RequestBuilder,SDMXREST21RequestBuilder-method
#'
#' @usage
#' SDMXREST21RequestBuilder(regUrl, repoUrl, accessKey, compliant, unsupportedResources,
#' skipProviderId, forceProviderId)
#'
#' @param regUrl an object of class "character" giving the base Url of the SDMX
#' service registry
#' @param repoUrl an object of class "character" giving the base Url of the SDMX
#' service repository
#' @param accessKey an object of class "character" indicating the name of request parameter for which
#' an authentication or subscription user key/token has to be provided to perform requests
#' @param compliant an object of class "logical" indicating if the web-service
#' is compliant with the SDMX REST web-service specifications
#' @param unsupportedResources an object of class "list" giving eventual unsupported
#' REST resources. Default is an empty list object
#' @param skipProviderId an object of class "logical" indicating that the provider
#' agencyIdshould be skipped. Used to control lack of strong SDMX REST compliance
#' from data providers. For now, it applies only for the "data" resource.
#' @param forceProviderId an object of class "logical" indicating if the provider
#' agencyId has to be added at the end of the request. Default value is
#' \code{FALSE}. For some providers, the \code{all} value for the provider
#' agency id is not allowed, in this case, the \code{agencyId} of the data
#' provider has to be forced in the web-request
#'
#' @examples
#' #how to create a SDMXREST21RequestBuilder
#' requestBuilder <- SDMXREST21RequestBuilder(
#' regUrl = "http://www.myorg/registry",
#' repoUrl = "http://www.myorg/repository",
#' compliant = TRUE)
#'
SDMXREST21RequestBuilder <- function(regUrl, repoUrl, accessKey = NULL, compliant,
unsupportedResources = list(),
skipProviderId = FALSE, forceProviderId = FALSE){
#params formatter
formatter = list(
#dataflow
dataflow = function(obj){return(obj)},
#datastructure
datastructure = function(obj){ return(obj)},
#data
data = function(obj){return(obj)}
)
#resource handler
handler <- list(
#'dataflow' resource (path="dataflow/{agencyID}/{resourceID}/{version}")
#-----------------------------------------------------------------------
dataflow = function(obj){
if(is.null(obj@agencyId)) obj@agencyId = "all"
if(is.null(obj@resourceId)) obj@resourceId = "all"
if(is.null(obj@version)) obj@version = "latest"
req <- sprintf("%s/dataflow/%s/%s/%s/",obj@regUrl, obj@agencyId, obj@resourceId, obj@version)
#require key
if(!is.null(accessKey)){
if(!is.null(obj@accessKey)){
if(length(grep("\\?",req))==0) req <- paste0(req, "?")
req <- paste(req, sprintf("%s=%s", accessKey, obj@accessKey), sep = "&")
}else{
stop("Requests to this service endpoint requires an API key")
}
}
return(req)
},
#'datastructure' resource (path="datastructure/{agencyID}/{resourceID}/{version})
#--------------------------------------------------------------------------------
datastructure = function(obj){
if(is.null(obj@agencyId)) obj@agencyId = "all"
if(is.null(obj@resourceId)) obj@resourceId = "all"
if(is.null(obj@version)) obj@version = "latest"
req <- sprintf("%s/datastructure/%s/%s/%s/",obj@regUrl, obj@agencyId, obj@resourceId, obj@version)
if(forceProviderId) req <- paste(req, obj@providerId, sep = "/")
req <- paste0(req, "?references=children") #TODO to see later to have arg for this
#require key
if(!is.null(accessKey)){
if(!is.null(obj@accessKey)){
if(length(grep("\\?",req))==0) req <- paste0(req, "?")
req <- paste(req, sprintf("%s=%s", accessKey, obj@accessKey), sep = "&")
}else{
stop("Requests to this service endpoint requires an API key")
}
}
return(req)
},
#'data' resource (path="data/{flowRef}/{key}/{providerRef})
#----------------------------------------------------------
data = function(obj){
if(is.null(obj@flowRef)) stop("Missing flowRef value")
if(is.null(obj@key)) obj@key = "all"
req <- sprintf("%s/data/%s/%s",obj@repoUrl, obj@flowRef, obj@key)
if(skipProviderId){
req <- paste0(req, "/")
}else{
req <- paste(req, ifelse(forceProviderId, obj@providerId, "all"), sep = "/")
req <- paste0(req, "/")
}
#DataQuery
#-> temporal extent (if any)
addParams = FALSE
if(!is.null(obj@start)){
req <- paste0(req, "?")
addParams = TRUE
req <- paste0(req, "startPeriod=", obj@start)
}
if(!is.null(obj@end)){
if(!addParams){
req <- paste0(req, "?")
}else{
req <- paste0(req, "&")
}
req <- paste0(req, "endPeriod=", obj@end)
}
#require key
if(!is.null(accessKey)){
if(!is.null(obj@accessKey)){
if(length(grep("\\?",req))==0) req <- paste0(req, "?")
req <- paste(req, sprintf("%s=%s", accessKey, obj@accessKey), sep = "&")
}else{
stop("Requests to this service endpoint requires an API key")
}
}
return(req)
}
)
new("SDMXREST21RequestBuilder",
regUrl = regUrl,
repoUrl = repoUrl,
accessKey = accessKey,
formatter = formatter,
handler = handler,
compliant = compliant,
unsupportedResources = unsupportedResources)
}
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