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#' @name SDMXConceptScheme
#' @rdname SDMXConceptScheme
#' @aliases SDMXConceptScheme,SDMXConceptScheme-method
#'
#' @usage
#' SDMXConceptScheme(xmlObj, namespaces)
#'
#' @param xmlObj object of class "XMLInternalDocument derived from XML package
#' @param namespaces object of class "data.frame" given the list of namespace URIs
#' @return an object of class "SDMXConceptScheme"
#'
#' @seealso \link{readSDMX}
#' @export
#'
SDMXConceptScheme <- function(xmlObj, namespaces){
messageNs <- findNamespace(namespaces, "message")
strNs <- findNamespace(namespaces, "structure")
sdmxVersion <- version.SDMXSchema(xmlDoc(xmlObj), namespaces)
VERSION.21 <- sdmxVersion == "2.1"
#attributes
#=========
id = xmlGetAttr(xmlObj, "id")
if(is.null(id)) id <- as.character(NA)
agencyId = xmlGetAttr(xmlObj, "agencyID")
if(is.null(agencyId)) agencyId <- as.character(NA)
version = xmlGetAttr(xmlObj, "version")
if(is.null(version)) version <- as.character(NA)
uri = xmlGetAttr(xmlObj, "uri")
if(is.null(uri)) uri <- as.character(NA)
urn = xmlGetAttr(xmlObj, "urn")
if(is.null(urn)) urn <- as.character(NA)
isExternalReference = xmlGetAttr(xmlObj, "isExternalReference")
if(is.null(isExternalReference)){
isExternalReference <- NA
}else{
isExternalReference <- as.logical(isExternalReference)
}
isFinal = xmlGetAttr(xmlObj, "isFinal")
if(is.null(isFinal)){
isFinal <- NA
}else{
isFinal <- as.logical(isFinal)
}
validFrom = xmlGetAttr(xmlObj,"validFrom")
if(is.null(validFrom)) validFrom <- as.character(NA)
validTo = xmlGetAttr(xmlObj, "validTo")
if(is.null(validTo)) validTo <- as.character(NA)
#elements
#========
#name (multi-languages)
conceptNamesXML <- NULL
if(VERSION.21){
comNs <- findNamespace(namespaces, "common")
conceptNamesXML <- getNodeSet(xmlDoc(xmlObj),
"//str:ConceptScheme/com:Name",
namespaces = c(str = as.character(strNs),
com = as.character(comNs)))
}else{
conceptNamesXML <- getNodeSet(xmlDoc(xmlObj),
"//str:ConceptScheme/str:Name",
namespaces = c(str = as.character(strNs)))
}
conceptNames <- list()
if(length(conceptNamesXML) > 0){
conceptNames <- new.env()
sapply(conceptNamesXML,
function(x){
lang <- xmlGetAttr(x,"xml:lang")
if(is.null(lang)) lang <- xmlGetAttr(x,"lang")
if(is.null(lang)) lang <- "default"
conceptNames[[lang]] <- xmlValue(x)
})
conceptNames <- as.list(conceptNames)
}
#description (multi-languages)
conceptDesXML <- getNodeSet(xmlDoc(xmlObj),
"//ns:ConceptScheme/ns:Description",
namespaces = strNs)
conceptDescriptions <- list()
if(length(conceptDesXML) > 0){
conceptDescriptions <- new.env()
sapply(conceptDesXML,
function(x){
lang <- xmlGetAttr(x,"xml:lang")
if(is.null(lang)) lang <- xmlGetAttr(x,"lang")
if(is.null(lang)) lang <- "default"
conceptDescriptions[[lang]] <- xmlValue(x)
})
conceptDescriptions <- as.list(conceptDescriptions)
}
#concepts
conceptsXML <- getNodeSet(xmlDoc(xmlObj),
"//ns:Concept",
namespaces = strNs)
concepts <- list()
if(length(conceptsXML) > 0){
concepts <- lapply(conceptsXML, SDMXConcept, namespaces)
}
#instantiate the object
obj<- new("SDMXConceptScheme",
#attributes
id = id,
agencyID = agencyId,
version = version,
uri = uri,
urn = urn,
isExternalReference = isExternalReference,
isFinal = isFinal,
validFrom = validFrom,
validTo = validTo,
#elements,
Name = conceptNames,
Description = conceptDescriptions,
Concept = concepts
)
}
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