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#' @name SDMXCrossSectionalData
#' @rdname SDMXCrossSectionalData
#' @aliases SDMXCrossSectionalData,SDMXCrossSectionalData-method
#'
#' @usage
#' SDMXCrossSectionalData(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 "SDMXCrossSectionalData"
#'
#' @seealso \link{readSDMX}
#' @export
#'
SDMXCrossSectionalData <- function(xmlObj, namespaces){
new("SDMXCrossSectionalData",
SDMXData(xmlObj, namespaces)
)
}
#methods
#=======
#'@export
as.data.frame.SDMXCrossSectionalData <- function(x, row.names=NULL, optional=FALSE,
labels = FALSE, ...){
xmlObj <- x@xmlObj;
dataset <- NULL
schema <- slot(x,"schema")
sdmxVersion <- slot(schema,"version")
#namespace
hasAuthorityNS <- FALSE
nsDefs.df <- getNamespaces(x)
ns <- findNamespace(nsDefs.df, "crosssection")
authorityNs <- nsDefs.df[
attr(regexpr("http://www.sdmx.org", nsDefs.df$uri, ignore.case = TRUE),"match.length") == -1,]
authorityNs <- as.data.frame(authorityNs, stringsAsFactors = FALSE)
colnames(authorityNs) <- "uri"
if(nrow(authorityNs) > 0){
hasAuthorityNS <- TRUE
if(nrow(authorityNs) > 1){
warning("More than one target dataset namespace found!")
authorityNs <- authorityNs[1L,]
authorityNs <- as.data.frame(authorityNs, stringsAsFactors = FALSE)
colnames(authorityNs) <- "uri"
}
}
#parse Groups
if(hasAuthorityNS){
groupsXML <- getNodeSet(xmlObj, "//ns:Group", namespaces = c(ns = authorityNs$uri))
if(length(groupsXML) == 0){
groupsXML <- getNodeSet(xmlObj, "//ns:Group", namespaces = ns)
}
}else{
if(length(ns) > 0){
groupsXML <- getNodeSet(xmlObj, "//ns:Group", namespaces = ns)
}else{
if(nrow(nsDefs.df) > 0){
groupNs <- nsDefs.df[1,]
groupsXML <- getNodeSet(xmlObj, "//nt:Group", c(nt = groupNs$uri))
}else{
stop("Unsupported CrossSectionalData parser for empty target XML namespace")
}
}
}
if(length(groupsXML) == 0){
groupsXML <- getNodeSet(xmlObj, "//Group")
}
groupsNb <- length(groupsXML)
if(groupsNb == 0) return(NULL);
#function to parse a Section
parseSection <- function(x){
sectionAttrs <- xmlAttrs(x)
sectionAttrs <- as.data.frame(t(sectionAttrs), stringsAsFactors = FALSE)
sectionChildren <- xmlChildren(x)
secObs <- names(sectionChildren)
secValues <- do.call("rbind.fill", lapply(sectionChildren, function(x) {
attrs <- xmlAttrs(x)
return(as.data.frame(t(attrs), stringsAsFactors = FALSE))
}))
secContent <- data.frame(sectionAttrs,
obs = secObs,
secValues,
stringsAsFactors = FALSE)
return(secContent)
}
#function to parse a Group
parseGroup <- function(x){
groupAttrs <- xmlAttrs(x)
groupAttrs <- as.data.frame(t(groupAttrs), stringsAsFactors = FALSE)
x <- xmlDoc(x)
if(hasAuthorityNS){
secXML <- getNodeSet(x, "//ns:Section", namespaces = c(ns = authorityNs$uri))
if(length(secXML) == 0){
secXML <- getNodeSet(x, "//ns:Section", namespaces = ns)
}
}else{
if(length(ns) > 0){
secXML <- getNodeSet(x, "//ns:Section", namespaces = ns)
}else{
if(nrow(nsDefs.df) > 0){
secNs <- nsDefs.df[1,]
secXML <- getNodeSet(x, "//nt:Section", c(nt = secNs$uri))
}else{
stop("Unsupported CrossSectionalData parser for empty target XML namespace")
}
}
}
if(length(secXML) == 0){
secXML <- getNodeSet(xmlObj, "//Section")
}
secNb <- length(secXML)
if(secNb == 0) return(NULL);
#converting SDMX section to a DataFrame R object
sections <- do.call("rbind.fill", lapply(secXML, parseSection))
group <- data.frame(groupAttrs, sections)
return(group)
}
#converting SDMX groups to a DataFrame R object
dataset <- do.call("rbind.fill", lapply(groupsXML, parseGroup))
if(any(as.character(dataset$obsValue) == "NaN", na.rm = TRUE)){
dataset[as.character(dataset$obsValue) == "NaN",]$obsValue <- NA
}
if(!is.null(dataset)) base::row.names(dataset) <- 1:nrow(dataset)
#enrich with labels
if(labels){
dsd <- slot(x, "dsd")
if(!is.null(dsd)) dataset <- addLabels.SDMXData(dataset, dsd)
}
# output
return(encodeSDMXOutput(dataset))
}
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