[R] How is a file descriptor stored ?

[mohan.radhakrishnan at polarisft.com]

Hi,
        I thought that 'R' like java will allow me to store file names
(keys) and file descriptors(values) in a hashmap.


filelist.array <- function(n){
  sink("nmon.log")
  cpufile <- new.env(hash=T, parent=emptyenv())
  for (i in 1:n) {
    key <- paste("output", i, ".txt", sep = "")
    assign(key, file( key, "w" ), cpufile)
  }
    sink()
   return (cpufile)
}

But when I try to test it like this there is an exception

[1] "Exception is  Error in UseMethod(\"close\"): no applicable method for
'close' applied to an object of class \"c('integer', 'numeric')\"\n"

test.simple.filelist.array <- function() {

    execution <- tryCatch({
		sink("nmon.log")
		listoffiles <- filelist.array(3)
		for (v in ls(listoffiles)) {
			print(paste("Map value is [", listoffiles[[v]], "]"))
			fd <- listoffiles[[v]]
			close(fd)
		}
        sink()
	}, error = function(err){
		print(paste("Exception is ",err))
	})
}

I think I am missing some fundamentals.

Thanks,
Mohan






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