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#' @name SDMXDataStructure
#' @rdname SDMXDataStructure
#' @aliases SDMXDataStructure,SDMXDataStructure-method
#'
#' @usage
#' SDMXDataStructure(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 "SDMXDataStructure"
#'
#' @seealso \link{readSDMX}
#' @export
#'
SDMXDataStructure <- function(xmlObj, namespaces){
sdmxVersion <- version.SDMXSchema(xmlDoc(xmlObj), namespaces)
VERSION.21 <- sdmxVersion == "2.1"
messageNs <- findNamespace(namespaces, "message")
strNs <- findNamespace(namespaces, "structure")
#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)
dsNamesXML <- NULL
if(VERSION.21){
comNs <- findNamespace(namespaces, "common")
dsNamesXML <- getNodeSet(xmlDoc(xmlObj),
"//str:DataStructure/com:Name",
namespaces = c(str = as.character(strNs),
com = as.character(comNs)))
}else{
dsNamesXML <- getNodeSet(xmlDoc(xmlObj),
"//str:KeyFamily/str:Name",
namespaces = c(str = as.character(strNs)))
}
dsNames <- list()
if(length(dsNamesXML) > 0){
dsNames <- new.env()
sapply(dsNamesXML,
function(x){
lang <- xmlGetAttr(x,"xml:lang")
if(is.null(lang)) lang <- xmlGetAttr(x,"lang")
if(is.null(lang)) lang <- "default"
dsNames[[lang]] <- xmlValue(x)
})
dsNames <- as.list(dsNames)
}
#description (multi-languages)
dsDesXML <- NULL
if(VERSION.21){
comNs <- findNamespace(namespaces, "common")
dsDesXML <- getNodeSet(xmlDoc(xmlObj),
"//str:DataStructure/com:Description",
namespaces = c(str = as.character(strNs),
com = as.character(comNs)))
}else{
dsDesXML <- getNodeSet(xmlDoc(xmlObj),
"//str:KeyFamily/str:Description",
namespaces = c(str = as.character(strNs)))
}
dsDescriptions <- list()
if(length(dsDesXML) > 0){
dsDescriptions <- new.env()
sapply(dsDesXML,
function(x){
lang <- xmlGetAttr(x,"xml:lang")
if(is.null(lang)) lang <- xmlGetAttr(x,"lang")
if(is.null(lang)) lang <- "default"
dsDescriptions[[lang]] <- xmlValue(x)
})
dsDescriptions <- as.list(dsDescriptions)
}
#Components
compXML <- NULL
if(VERSION.21){
compXML <- getNodeSet(xmlDoc(xmlObj),
"//str:DataStructureComponents",
namespaces = c(str = as.character(strNs)))
}else{
compXML <- getNodeSet(xmlDoc(xmlObj),
"//str:Components",
namespaces = c(str = as.character(strNs)))
}
components <- NULL
if(length(compXML) > 0) components <- SDMXComponents(xmlObj, namespaces)
#instantiate the object
obj<- new("SDMXDataStructure",
#attributes
id = id,
agencyID = agencyId,
version = version,
uri = uri,
urn = urn,
isExternalReference = isExternalReference,
isFinal = isFinal,
validFrom = validFrom,
validTo = validTo,
#elements,
Name = dsNames,
Description = dsDescriptions,
Components = components
)
}
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