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#' @title XOR
#'
#' @description Check for exclusiveness of two activities.
#'
#' If `activity_a` exists, `activity_b` should not exist, and vice versa.
#'
#' @inherit and params
#'
#' @family Exclusiveness rules
#'
#' @examples
#' library(bupaR)
#' library(eventdataR)
#'
#' # A patient should not receive both an X-Ray and MRI Scan.
#' patients %>%
#' check_rule(xor("X-Ray","MRI SCAN"))
#'
#' @export
xor <- function(activity_a, activity_b) {
rule <- list()
rule$activity_a <- activity_a
rule$activity_b <- activity_b
class(rule) <- c("conformance_rule", "list")
attr(rule, "type") <- "xor"
attr(rule, "checker") <- xor_checker
attr(rule, "label") <- paste0("xor_",
str_replace(activity_a, "-| ", "_"),
"_",
str_replace(activity_b, "-| ", "_"))
return(rule)
}
xor_checker <- function(log, rule) {
UseMethod("xor_checker")
}
xor_checker.log <- function(log, rule) {
check_activity_in_log(rule$activity_a, log)
check_activity_in_log(rule$activity_b, log)
log %>%
group_by_case() %>%
mutate(rule_holds = !(any(.data[[activity_id(log)]] == rule$activity_a) &
any(.data[[activity_id(log)]] == rule$activity_b))) %>%
ungroup_eventlog()
}
xor_checker.grouped_log <- function(log, rule) {
bupaR:::apply_grouped_fun(log, xor_checker.log, rule, .ignore_groups = TRUE, .keep_groups = TRUE, .returns_log = TRUE)
}
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