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#' @title Retrieve All Available Attributes for a Specific Dataset
#' @description This function queries the BioMart Interface and returns a table
#' storing all available attributes for a specific dataset.
#'
#' @param mart a character string specifying the database (mart)
#' for which datasets shall be listed.
#' @param dataset a character string specifying the dataset for which
#' attributes shall be listed.
#' @param mute_citation logical value indicating whether citation message should be muted.
#' @author Hajk-Georg Drost
#' @examples
#' \dontrun{
#' # search for available datasets
#' getMarts()
#'
#' # choose database (mart): ENSEMBL_MART_ENSEMBL
#' # and get a table of all available datasets from this BioMart database
#' head(getDatasets(mart = "ENSEMBL_MART_ENSEMBL"), 10)
#'
#' # choose dataset: "hsapiens_gene_ensembl"
#' head(getAttributes(mart = "ENSEMBL_MART_ENSEMBL",
#' dataset = "hsapiens_gene_ensembl") , 5)
#' }
#' @family biomaRt
#' @export
getAttributes <- function(mart, dataset, mute_citation = FALSE){
if ((!is.character(mart)) || (!is.character(dataset)))
stop("Please use a character string as mart or dataset.",
call. = FALSE)
type <- "attributes"
message("Starting retrieval of ", type, " information from mart ", mart, " and dataset ", dataset, " ...")
url <- biomart_full_url(mart, dataset, type)
testContent <-
httr::content(httr::GET(url), as = "text", encoding = "UTF-8")
if (testContent == "Attribute 'mains' does not exist\n") {
warning("No attributes were available for mart = ",
mart,
" and dataset = ",
dataset,
".",
call. = FALSE)
attrBioMart <- data.frame(name = "NA", description = "NA")
return(attrBioMart)
}
attributesPage <- httr::handle(url)
xmlContentAttributes <- httr::GET(handle = attributesPage)
httr::stop_for_status(xmlContentAttributes)
# extract attribute name and attribute description
suppressWarnings(rawDF <-
do.call("rbind", apply(as.data.frame(strsplit(
httr::content(xmlContentAttributes, as = "text",
encoding = "UTF-8"),
"\n"
)), 1, function(x)
unlist(strsplit(x, "\t")))))
colnames(rawDF) <- paste0("V", seq_len(ncol(rawDF)))
attrBioMart <-
as.data.frame(rawDF[, c("V1", "V2")],
stringsAsFactors = FALSE,
colClasses = rep("character", 2))
colnames(attrBioMart) <- c("name", "description")
please_cite_biomartr(mute_citation = mute_citation)
return(attrBioMart)
}
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