The R Project SVN R

options(error = recover)

## simple call, only field names

fg <- setRefClass("foo", c("bar", "flag"))

f1<- new("foo")

f1$bar

f1 <- fg$new(flag = "testing")

f1$bar <- 1

stopifnot(identical(f1$bar, 1))

fg$methods(showAll = function() c(bar, flag))

stopifnot(all.equal(f1$showAll(), c(1, "testing")))

fg <- setRefClass("foo", list(bar = "numeric", flag = "character"),

            methods = list(

            addToBar = function(incr) {

                b = bar + incr

                bar <<- b

                b

            }

            ))

ff = new("foo", bar = 1.5)

stopifnot(identical(ff$bar, 1.5))

ff$bar <- pi

stopifnot(identical(ff$bar, pi))

## test against generator

f2 <- fg$new(bar = pi)

## identical does not return TRUE if *contents* of env are identical

stopifnot(identical(ff$bar, f2$bar), identical(ff$flag, f2$flag))

f2$flag <- "standard flag"

stopifnot(identical(f2$flag, "standard flag"))

## fg$lock("flag")

## tryCatch(f2$flag <- "other", error = function(e)e)

## add some accessor methods

fg$accessors("bar")

ff$setBar(1:3)

stopifnot(identical(ff$getBar(), 1:3))

ff$getBar()

stopifnot(all.equal(ff$addToBar(1), 2:4))

## Add a method

fg$methods(barTimes = function(x) {

    "This method multiples field bar by argument x

and this string is self-documentation"

    setBar(getBar() * x)})

ffbar <- ff$getBar()

ff$barTimes(10)

stopifnot(all.equal(ffbar * 10, ff$getBar()))

ff$barTimes(.1)

## inheritance.  redefines flag so should fail:

stopifnot(is(tryCatch(setRefClass("foo2", list(b2 = "numeric", flag = "complex"),

            contains = "foo",

            refMethods = list(addBoth = function(incr) {

                addToBar(incr) #uses inherited class method

                setB2(getB2() + incr)

                })),

          error = function(e)e), "error"))

## but with flag as a subclass of "character", should work

setClass("ratedChar", contains = "character", representation(score = "numeric"))

foo2 <- setRefClass("foo2", list(b2 = "numeric", flag = "ratedChar"),

            contains = "foo",

            methods = list(addBoth = function(incr) {

                addToBar(incr) #uses inherited class method

                b2<<- b2 + incr

                }))

## now lock the flag field; should still allow one write

foo2$lock("flag")

f2 <- foo2$new(bar = -3, flag = as("ANY", "ratedChar"), b2 = ff$bar)

## but not a second one

stopifnot(is(tryCatch(f2$flag <- "Try again",

         error = function(e)e), "error"))

f22 <- foo2$new(bar = f2$bar)

## same story if assignment follows the initialization

f22$flag <- f2$flag

stopifnot(is(tryCatch(f22$flag <- "Try again",

         error = function(e)e), "error"))

## Exporting superclass object

f22 <- fg$new(bar = f2$bar, flag = f2$flag)

f2e <- f2$export("foo")

stopifnot(identical(f2e$bar, f22$bar), identical(f2e$flag, f22$flag),

          identical(class(f2e), class(f22)))

stopifnot(identical(f2$flag,  as("ANY", "ratedChar")), identical(f2$bar, -3),

          all.equal(f2$b2, 2:4+0))

f2$addBoth(-1)

stopifnot(all.equal(f2$bar, -4), all.equal(f2$b2, 1:3+0))

## test callSuper()

setRefClass("foo3", fields = list(flag2 = "ratedChar"),

            contains = "foo2",

            methods = list(addBoth = function(incr) {

                callSuper(incr)

                flag2 <<- as(paste(flag, paste(incr, collapse = ", "), sep = "; "), "ratedChar")

                incr

            }))

f2 <- foo2$new(bar = -3, flag = as("ANY", "ratedChar"), b2 =  1:3)

f3 <- new("foo3")

f3$import(f2)

stopifnot(all.equal(f3$b2, f2$b2), all.equal(f3$bar, f2$bar), all.equal(f3$flag, f2$flag))

f3$addBoth(1)

stopifnot(all.equal(f3$bar, -2), all.equal(f3$b2, 2:4+0),

          all.equal(f3$flag2, as("ANY; 1", "ratedChar")))

## but the import should have used up the one write for $flag

stopifnot(is(tryCatch(f3$flag <- "Try again",

         error = function(e)e), "error"))

## a class with an initialize method, and an extra slot

setOldClass(c("simple.list", "list"))

fg4 <- setRefClass("foo4",

            contains = "foo2",

            methods = list(

              initialize = function(...) {

                  .self <- initFields(...)

                  .self@made = R.version

                  .self

              }),

            representation = list(made = "simple.list")

            )

f4 <- new("foo4", flag = "another test", bar = 1:3)

stopifnot(identical(f4@made, R.version))

## simple active binding test

abGen <- setRefClass("ab",

                  fields = list(a = "ANY",

                  b = function(x) if(missing(x)) a else {a <<- x; x}))

ab1 <- abGen$new(a = 1)

stopifnot(identical(ab1$a, 1), identical(ab1$b, 1))

ab1$b <- 2

stopifnot(identical(ab1$a, 2), identical(ab1$b, 2))

## a simple editor for matrix objects.  Method  $edit() changes some

## range of values; method $undo() undoes the last edit.

mEditor <- setRefClass("matrixEditor",

      fields = list( data = "matrix",

        edits = "list"),

      methods = list(

     edit = function(i, j, value) {

       ## the following string documents the edit method

       'Replaces the range [i, j] of the

        object by value.

        '

         backup <-

             list(i, j, data[i,j])

         data[i,j] <<- value

         edits <<- c(list(backup),

                     edits)

         invisible(value)

     },

     undo = function() {

       'Undoes the last edit() operation

        and update the edits field accordingly.

        '

         prev <- edits

         if(length(prev)) prev <- prev[[1]]

         else stop("No more edits to undo")

         edit(prev[[1]], prev[[2]], prev[[3]])

         ## trim the edits list

         length(edits) <<- length(edits) - 2

         invisible(prev)

     }

     ))

xMat <- matrix(1:12,4,3)

xx <- mEditor$new(data = xMat)

xx$edit(2, 2, 0)

xx$data

xx$undo()

mEditor$help("undo")

stopifnot(all.equal(xx$data, xMat))

## add a method to save the object

mEditor$methods(

     save = function(file) {

       'Save the current object on the file

        in R external object format.

       '

         base::save(.self, file = file)

     }

)

tf <- tempfile()

xx$save(tf) #$

load(tf)

unlink(tf)

stopifnot(identical(xx$data, .self$data))

markViewer <- ""

setMarkViewer <- function(what)

    markViewer <<- what

## Inheriting a reference class:  a matrix viewer

mv <- setRefClass("matrixViewer",

    fields = c("viewerDevice", "viewerFile"),

    contains = "matrixEditor",

    methods = list( view = function() {

        dd <- dev.cur(); dev.set(viewerDevice)

        devAskNewPage(FALSE)

        matplot(data, main = paste("After",length(edits),"edits"))

        dev.set(dd)},

        edit = # invoke previous method, then replot

          function(i, j, value) {

            callSuper(i, j, value)

            view()

          }))

## initialize and finalize methods

mv$methods( initialize = function(...) {

    viewerFile <<- tempfile("matrixView")

    pdf(viewerFile)

    viewerDevice <<- dev.cur()

    message("Plotting to ", viewerFile)

    dev.set(dev.prev())

    setMarkViewer("ON")

    initFields(...)

  },

  finalize = function() {

    dev.off(viewerDevice)

    setMarkViewer("OFF")

  })

ff = new("matrixViewer", data = xMat)

stopifnot(identical(markViewer, "ON")) # check initialize

ff$edit(2,2,0)

ff$data

ff$undo()

stopifnot(all.equal(ff$data, xMat))

rm(ff)

gc()

stopifnot(identical(markViewer, "OFF")) #check finalize

## deal correctly with inherited methods and overriding existing

## methods from $methods(...)

refClassA <- setRefClass("refClassA", methods=list(foo=function() "A"))

refClassB <- setRefClass("refClassB", contains="refClassA")

mnames <- objects(getClass("refClassB")@refMethods)

refClassB$methods(foo=function() callSuper())

stopifnot(identical(refClassB$new()$foo(), "A"))

mnames2 <- objects(getClass("refClassB")@refMethods)

stopifnot(identical(mnames2[is.na(match(mnames2,mnames))], "foo#refClassA"))

refClassB$methods(foo=function() paste(callSuper(), "Version 2"))

stopifnot(identical(refClassB$new()$foo(), "A Version 2"))

stopifnot(identical(mnames2, objects(getClass("refClassB")@refMethods)))

if(methods:::.hasCodeTools()) {

    ## code warnings assigning locally to, or hiding, field names

    stopifnot(is(tryCatch(mv$methods(test = function(x) {data <- x[!is.na(x)]; mean(data)}), warning = function(e)e), "warning"))

    stopifnot(is(tryCatch(mv$methods(test2 = function(data) {data[!is.na(x)]}), warning = function(e)e), "warning"))

} else

    warning("Can't run some tests:  recommended package codetools is not available")

## tests (fragmentary by necessity) of promptClass for reference class

suppressMessages(promptClass("refClassB", filename = textConnection("ctxt", "w")))

## look for a method, inheritance, inherited method

stopifnot(length(c(grep("foo.*refClassA", ctxt),

                   grep("code{foo()}", ctxt, fixed = TRUE),

                   grep("linkS4class{refClassA", ctxt, fixed = TRUE))) >= 3)

rm(ctxt)