R/gtoxLoadClib.R

In GladiaTOX: R Package for Processing High Content Screening data

#####################################################################
## This program is distributed in the hope that it will be useful, ##
## but WITHOUT ANY WARRANTY; without even the implied warranty of  ##
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the    ##
## GNU General Public License for more details.                    ##
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#-------------------------------------------------------------------------------
# gtoxLoadClib: Load chemical library information
#-------------------------------------------------------------------------------

#' @title Load chemical library information
#'
#' @description
#' \code{gtoxLoadClib} queries the gtox databases and returns information
#' about the chemial library.
#'
#' @param field Character of length 1, \code{'chid'} or \code{'clib'}, whether
#' to search by chemical id (chid), or chemical library (clib)
#' @param val The values to query on
#'
#' @details
#' Chemicals are stored in different libraries by chemcial ID. Therefore, it
#' is not possible to delineate samples with the same chemical ID into two
#' distinct chemical libraries. However, it is possible for a chemcial ID to
#' belong to more than one (or no) chemical libraries.
#'
#' When chemicals belong to more than one library, the chemical is listed
#' multiple times (one for each distinct library).
#'
#' @examples
#' ## Store the current config settings, so they can be reloaded at the end
#' ## of the examples
#' conf_store <- gtoxConfList()
#' gtoxConfDefault()
#'
#' ## Passing no parameters gives all of the chemical ISs that have a chemical
#' ## library registered
#' clib <- gtoxLoadClib()
#'
#' ## Reset configuration
#' options(conf_store)
#'
#' @return A data.table with the chemical library information for the given
#' parameters.
#'
#' @import data.table
#' @export

gtoxLoadClib <- function(field=NULL, val=NULL) {

    if (!is.null(field)) {
        vfield <- c("chid", "clib")
        if (!field %in% vfield) stop("Invalid 'field' value.")
    }

    qstring <- .ClibQ(field=field, val=val)

    dat <- gtoxQuery(query=qstring, db=getOption("TCPL_DB"))


    if (!is.null(field)) {

        if (nrow(dat) == 0) {
            warning("The given ",
                    field,"(s) do not have chemical library assigned.")
            return(dat[])
        }

    }

    dat[]

}

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