R/onLoad.R

In miraisolutions/xlconnectjars: JAR Dependencies for the XLConnect Package

#############################################################################
#
# XLConnectJars
# Copyright (C) 2010-2018 Mirai Solutions GmbH
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
#############################################################################

#############################################################################
#
# XLConnectJars Package Initialization
# 
# Author: Martin Studer, Mirai Solutions GmbH
#
#############################################################################

.onLoad <- function(libname, pkgname) {
	# Load Java dependencies (all jars inside the java subfolder)
	.jpackage(name = pkgname, jars = "*")
  
  # Java version check
  jv <- .jcall("java/lang/System", "S", "getProperty", "java.runtime.version")
  if(substr(jv, 1L, 2L) == "1.") {
    jvn <- as.numeric(paste0(strsplit(jv, "[.]")[[1L]][1:2], collapse = "."))
    if(jvn < 1.6) stop("Java 6 or higher is needed for this package")
  }
}