R/check-conform.R

In behavr: Canonical Data Structure for Behavioural Data

#' A helper function that ensures data and metadata are compatible (same key)
#' @noRd
check_conform <- function(x, metadata = NULL){

  if(!data.table::is.data.table(x))
    stop("x is not a data.table!")

  if(is.null(metadata)){
    if(!is.behavr(x))
      stop("x is not a behavr object.
           When metadata is not provided, x should be a behavr!")
    metadata <- meta(x)
  }
  if(is.null(metadata))
    stop("no metadata!")


  if(!data.table::is.data.table(metadata))
    stop("metadata is not a data.table!")

  k_x <- data.table::key(x)
  k_m <- data.table::key(metadata)

  if(is.null(k_x))
    stop("x has no key")
  if(is.null(k_m))
    stop("metadata has no key")

  if(!identical(k_x, k_m))
    stop("x and metadata have different keys. The keys mus be columns with the same name!")
}