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#' JAR Files for Support Scala Versions
#'
#' This function returns a named list whose elements give the file system paths of the JAR files for the supported major versions of Scala.
#'
#' @return A list whose names correspond to Scala major versions and whose elements are file system paths.
#' @export
#'
#' @examples
#' scalaVersionJARs()
#'
scalaVersionJARs <- function() {
pkgHome <- if ( identical(Sys.getenv("R_INSTALL_PKG"),"rscala") ) file.path(Sys.getenv("R_PACKAGE_DIR"),"inst") else find.package("rscala")
majorVersions <- gsub("^scala-(.*)","\\1",list.dirs(file.path(pkgHome,"java"),full.names=FALSE,recursive=FALSE))
if ( length(majorVersions) == 0 ) return(character(0))
result <- sapply(majorVersions, function(v) list.files(file.path(pkgHome,"java",paste0("scala-",v)),full.names=TRUE))
as.list(result[sapply(result, function(x) !is.null(x) && length(x) > 0)])
}
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