#' @importFrom utils packageVersion download.file
#' @importFrom rJava .jpackage
.onLoad <- function(libname, pkgname) {
## path to the java folder
path <- paste0(system.file('', package = pkgname), 'java')
if (!file.exists(path)) {
dir.create(path)
}
## path to the JDBC driver
file <- sprintf('snowflake-jdbc-%s.jar', packageVersion(pkgname))
path <- file.path(path, file)
## check if the jar is available and install if needed (on first load)
if (!file.exists(path)) {
url <- file.path(
'https://repo1.maven.org/maven2/net/snowflake/snowflake-jdbc',
packageVersion(pkgname), file)
## download the jar file from Maven
try(download.file(url = url, destfile = path, mode = 'wb'),
silent = TRUE)
}
## add the RJDBC driver and the log4j properties file to classpath
rJava::.jpackage(pkgname, lib.loc = libname)
}
.onAttach <- function(libname, pkgname) {
## let the user know if the automatic JDBC driver installation failed
path <- system.file('java', package = pkgname)
if (length(list.files(path, '^snowflake-jdbc-[0-9.]*jar$')) == 0) {
packageStartupMessage(
'The automatic installation of the Snowflake JDBC driver seems to have failed.\n',
'Please check your Internet connection and if the current user can write to ', path, '\n',
'If still having issues, install the jar file manually as described at:\n',
'https://docs.snowflake.net/manuals/user-guide/jdbc-download.html\n')
}
}
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