#' @title Return variable names from the input schema.
#'
#' @description \code{getVariables} extracts the slot \code{df} of the input object and returns its
#' column \code{variable} as a vector.
#'
#' @param object Object of class \linkS4class{StfwfSchema}.
#'
#' @return A character vector.
#'
#' @examples
#' # A trivial example:
#' df <- data.frame(variable = c('Turnover', 'Employees'),
#' width = c(9L, 3L),
#' initialPos = c(1, 10),
#' finalPos = c(9, 12),
#' type = rep('num', 2),
#' valueRegEx = c('[0-9]{0,9}', '[0-9]{0,3}'),
#' description = c('Turnover of the business unit',
#' 'Number of employees of the business unit'),
#' stringsAsFactors = FALSE)
#' Schema <- new(Class = 'StfwfSchema', df = df)
#' getVariables(Schema)
#'
#'
#' @include getdf.R
#'
#' @export
setGeneric("getVariables", function(object){standardGeneric("getVariables")})
#' @rdname getVariables
#'
#' @export
setMethod(
f = "getVariables",
signature = c("StfwfSchema"),
function(object){getdf(object)[['variable']]}
)
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