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## This file is part of the rJava package - low-level R/Java interface
## (C)2006 Simon Urbanek <simon.urbanek@r-project.org>
## For license terms see DESCRIPTION and/or LICENSE
##
## $Id: jinit.R 570 2011-07-11 15:28:40Z urbanek $
.check.JVM <- function()
.Call(RJava_checkJVM)
.need.init <- function()
.Call(RJava_needs_init)
## initialization
.jinit <- function(classpath=NULL, parameters=getOption("java.parameters"), ..., silent=FALSE, force.init=FALSE) {
running.classpath <- character()
if (!.need.init()) {
running.classpath <- .jclassPath()
if (!force.init) {
if (length(classpath)) {
cpc <- unique(unlist(strsplit(classpath, .Platform$path.sep)))
if (length(cpc)) .jaddClassPath(cpc)
}
return(0)
}
}
## determine path separator
path.sep <- .Platform$path.sep
if (!is.null(classpath)) {
classpath <- as.character(classpath)
if (length(classpath))
classpath <- paste(classpath,collapse=path.sep)
}
# merge CLASSPATH environment variable if present
cp<-Sys.getenv("CLASSPATH")
if (!is.null(cp)) {
if (is.null(classpath))
classpath<-cp
else
classpath<-paste(classpath,cp,sep=path.sep)
}
# set rJava/java/boot for boostrap (so we can get RJavaClassLoader)
boot.classpath <- file.path(.rJava.base.path,"java","boot")
# if running in a sub-arch, append -Dr.arch in case someone gets the idea to start JRI
if (is.character(.Platform$r_arch) && nzchar(.Platform$r_arch) && length(grep("-Dr.arch", parameters, fixed=TRUE)) == 0L)
parameters <- c(paste("-Dr.arch=/", .Platform$r_arch, sep=''), as.character(parameters))
#cat(">> init CLASSPATH =",classpath,"\n")
#cat(">> boot class path: ", boot.classpath,"\n")
# call the corresponding C routine to initialize JVM
xr<-.External(RinitJVM, boot.classpath, parameters)
if (xr==-1) stop("Unable to initialize JVM.")
if (xr==-2) stop("Another VM is already running and rJava was unable to attach to that VM.")
# we'll handle xr==1 later because we need fully initialized rJava for that
# this should remove any lingering .jclass objects from the global env
# left there by previous versions of rJava
pj <- grep("^\\.jclass",ls(1,all.names=TRUE),value=TRUE)
if (length(pj)>0) {
rm(list=pj,pos=1)
if (exists(".jniInitialized",1)) rm(list=".jniInitialized",pos=1)
if (!silent) warning("rJava found hidden Java objects in your workspace. Internal objects from previous versions of rJava were deleted. Please note that Java objects cannot be saved in the workspace.")
}
##--- HACK-WARNING: we're operating directly on the namespace environment
## this could be dangerous.
for (x in .delayed.variables) unlockBinding(x, .env)
assign(".jniInitialized", TRUE, .env)
# get cached class objects for reflection
assign(".jclassObject", .jcall("java/lang/Class","Ljava/lang/Class;","forName","java.lang.Object"), .env)
assign(".jclassClass", .jcall("java/lang/Class","Ljava/lang/Class;","forName","java.lang.Class"), .env)
assign(".jclassString", .jcall("java/lang/Class","Ljava/lang/Class;","forName","java.lang.String"), .env)
ic <- .jcall("java/lang/Class","Ljava/lang/Class;","forName","java.lang.Integer")
f<-.jcall(ic,"Ljava/lang/reflect/Field;","getField", "TYPE")
assign(".jclass.int", .jcast(.jcall(f,"Ljava/lang/Object;","get",.jcast(ic,"java/lang/Object")),"java/lang/Class"), .env)
ic <- .jcall("java/lang/Class","Ljava/lang/Class;","forName","java.lang.Double")
f<-.jcall(ic,"Ljava/lang/reflect/Field;","getField", "TYPE")
assign(".jclass.double", .jcast(.jcall(f,"Ljava/lang/Object;","get",.jcast(ic,"java/lang/Object")),"java/lang/Class"), .env)
ic <- .jcall("java/lang/Class","Ljava/lang/Class;","forName","java.lang.Float")
f<-.jcall(ic,"Ljava/lang/reflect/Field;","getField", "TYPE")
assign(".jclass.float", .jcast(.jcall(f,"Ljava/lang/Object;","get",.jcast(ic,"java/lang/Object")),"java/lang/Class"), .env)
ic <- .jcall("java/lang/Class","Ljava/lang/Class;","forName","java.lang.Boolean")
f<-.jcall(ic,"Ljava/lang/reflect/Field;","getField", "TYPE")
assign(".jclass.boolean", .jcast(.jcall(f,"Ljava/lang/Object;","get",.jcast(ic,"java/lang/Object")),"java/lang/Class"), .env)
ic <- .jcall("java/lang/Class","Ljava/lang/Class;","forName","java.lang.Void")
f<-.jcall(ic,"Ljava/lang/reflect/Field;","getField", "TYPE")
assign(".jclass.void", .jcast(.jcall(f,"Ljava/lang/Object;","get",.jcast(ic,"java/lang/Object")),"java/lang/Class"), .env)
## if NOAWT is set, set AWT to headless
if (nzchar(Sys.getenv("NOAWT"))) .jcall("java/lang/System","S","setProperty","java.awt.headless","true")
lib <- "libs"
if (nchar(.Platform$r_arch)) lib <- file.path("libs", .Platform$r_arch)
rjcl <- NULL
if (xr==1) { # && nchar(classpath)>0) {
# ok, so we're attached to some other JVM - now we need to make sure that
# we can load our class loader. If we can't then we have to use our bad hack
# to be able to squeeze our loader in
# first, see if this is actually JRIBootstrap so we have a loader already
rjcl <- .Call(RJava_primary_class_loader)
if (is.null(rjcl) || .jidenticalRef(rjcl,.jzeroRef)) rjcl <- NULL
else rjcl <- new("jobjRef", jobj=rjcl, jclass="RJavaClassLoader")
if (is.jnull(rjcl))
rjcl <- .jnew("RJavaClassLoader", .rJava.base.path,
file.path(.rJava.base.path, lib), check=FALSE)
.jcheck(silent=TRUE)
if (is.jnull(rjcl)) {
## it's a hack, so we run it in try(..) in case BadThings(TM) happen ...
cpr <- try(.jmergeClassPath(boot.classpath), silent=TRUE)
if (inherits(cpr, "try-error")) {
.jcheck(silent=TRUE)
if (!silent) warning("Another VM is running already and the VM did not allow me to append paths to the class path.")
assign(".jinit.merge.error", cpr, .env)
}
if (length(parameters)>0 && any(parameters!=getOption("java.parameters")) && !silent)
warning("Cannot set VM parameters, because VM is running already.")
}
}
if (is.jnull(rjcl))
rjcl <- .jnew("RJavaClassLoader", .rJava.base.path,
file.path(.rJava.base.path, lib), check=FALSE )
if (!is.jnull(rjcl)) {
## init class loader
assign(".rJava.class.loader", rjcl, .env)
##-- set the class for native code
.Call(RJava_set_class_loader, .env$.rJava.class.loader@jobj)
## now it's time to add any additional class paths
cpc <- unique(strsplit(classpath, .Platform$path.sep)[[1]])
if (length(cpc)) .jaddClassPath(cpc)
} else stop("Unable to create a Java class loader.")
##.Call(RJava_new_class_loader, .rJava.base.path, file.path(.rJava.base.path, lib))
## lock namespace bindings
for (x in .delayed.variables) lockBinding(x, .env)
## now we need to update the attached namespace (package env) as well
m <- match(paste("package", getNamespaceName(.env), sep = ":"), search())[1]
if (!is.na(m)) { ## only is it is attached
pe <- as.environment(m)
for (x in .delayed.export.variables) {
unlockBinding(x, pe)
pe[[x]] <- .env[[x]]
lockBinding(x, pe)
}
}
# FIXME: is this the best place or should this be done
# internally right after the RJavaClassLoader is instanciated
# init the cached RJavaTools class in the jni side
.Call( "initRJavaTools", PACKAGE = "rJava" )
# not yet
# import( c( "java.lang", "java.util") )
invisible(xr)
}
# FIXME: this is not always true: osgi, eclipse etc use a different
# class loader strategy, we should add some sort of hook to let people
# define how they want this to be done
.jmergeClassPath <- function(cp) {
ccp <- .jcall("java/lang/System","S","getProperty","java.class.path")
ccpc <- strsplit(ccp, .Platform$path.sep)[[1]]
cpc <- strsplit(cp, .Platform$path.sep)[[1]]
rcp <- unique(cpc[!(cpc %in% ccpc)])
if (length(rcp) > 0) {
# the loader requires directories to include trailing slash
# Windows: need / or \ ? (untested)
dirs <- which(file.info(rcp)$isdir)
for (i in dirs)
if (substr(rcp[i],nchar(rcp[i]),nchar(rcp[i]))!=.Platform$file.sep)
rcp[i]<-paste(rcp[i], .Platform$file.sep, sep='')
## this is a hack, really, that exploits the fact that the system class loader
## is in fact a subclass of URLClassLoader and it also subverts protection
## of the addURL class using reflection - yes, bad hack, but we use it
## only if the boot class path doesn't contain our own class loader so
## we cannot replace the system loader with our own (this will happen when we
## need to attach to an existing VM)
## The original discussion and code for this hack was at:
## http://forum.java.sun.com/thread.jspa?threadID=300557&start=15&tstart=0
## it should probably be run in try(..) because chances are that it will
## break if Sun changes something...
cl <- .jcall("java/lang/ClassLoader", "Ljava/lang/ClassLoader;", "getSystemClassLoader")
urlc <- .jcall("java/lang/Class", "Ljava/lang/Class;", "forName", "java.net.URL")
clc <- .jcall("java/lang/Class", "Ljava/lang/Class;", "forName", "java.net.URLClassLoader")
ar <- .jcall("java/lang/reflect/Array", "Ljava/lang/Object;",
"newInstance", .jclassClass, 1:1)
.jcall("java/lang/reflect/Array", "V", "set",
.jcast(ar, "java/lang/Object"), 0:0,
.jcast(urlc, "java/lang/Object"))
m<-.jcall(clc, "Ljava/lang/reflect/Method;", "getDeclaredMethod", "addURL", .jcast(ar,"[Ljava/lang/Class;"))
.jcall(m, "V", "setAccessible", TRUE)
ar <- .jcall("java/lang/reflect/Array", "Ljava/lang/Object;",
"newInstance", .jclassObject, 1:1)
for (fn in rcp) {
f <- .jnew("java/io/File", fn)
url <- .jcall(f, "Ljava/net/URL;", "toURL")
.jcall("java/lang/reflect/Array", "V", "set",
.jcast(ar, "java/lang/Object"), 0:0,
.jcast(url, "java/lang/Object"))
.jcall(m, "Ljava/lang/Object;", "invoke",
.jcast(cl, "java/lang/Object"), .jcast(ar, "[Ljava/lang/Object;"))
}
# also adjust the java.class.path property to not confuse others
if (length(ccp)>1 || (length(ccp)==1 && nchar(ccp[1])>0))
rcp <- c(ccp, rcp)
acp <- paste(rcp, collapse=.Platform$path.sep)
.jcall("java/lang/System","S","setProperty","java.class.path",as.character(acp))
} # if #rcp>0
invisible(.jcall("java/lang/System","S","getProperty","java.class.path"))
}
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