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utilities.R
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utilities.R
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# .guess_cell_type
# .onLoad
# .Rcolor2XLcolor
# .splitBlocks
# .hssfcolor
# .xssfcolor
###################################################################
# given a vector of cells, return the "appropriate" R type
# you cannot decide if it's a Date or a POSIXct
#
# only returns "numeric", "character", "POSIXct"
#
.guess_cell_type <- function(cells)
{
cellType <- sapply(cells, function(x){x$getCellType()}) + 1
dateUtil <- .jnew("org/apache/poi/ss/usermodel/DateUtil")
isDateTime <- mapply(function(x,y) {
if (y != 1) { # if it's not numeric, forget about it
FALSE
} else {
dateUtil$isCellDateFormatted(x)
}
}, cells, cellType)
guessedColClasses <- ifelse(cellType==1,"numeric", "character")
guessedColClasses[isDateTime] <- "POSIXct"
guessedColClasses
}
####################################################################
#
.onLoad <- function(libname, pkgname)
{
rJava::.jpackage("xlsxjars")
rJava::.jpackage(pkgname, lib.loc = libname) # needed to load RInterface.java
set_java_tmp_dir(getOption("xlsx.tempdir", tempdir()))
wb <- createWorkbook() # load/initialize jars here as it takes
rm(wb) # a few seconds ...
options(xlsx.date.format = "m/d/yyyy") # e.g. 3/18/2013
options(xlsx.datetime.format = "m/d/yyyy h:mm:ss") # e.g. 3/18/2013 05:25:51
}
####################################################################
# Converts R color into Excel compatible color
# rcolor <- c("red", "blue")
#
.Rcolor2XLcolor <- function( rcolor, isXSSF=TRUE )
{
if ( isXSSF ) {
sapply( rcolor, .xssfcolor )
} else {
sapply( rcolor, .hssfcolor )
}
}
###################################################################
# Split a vector into contiguous chunks c(1,2,3, 6,7, 9,10,11)
# @param x an integer vector
# @return a list of integer vectors, each vector being a group.
#
.splitBlocks <- function(x)
{
blocks <- list(x[1])
if (length(x)==1)
return(blocks)
k <- 1
for (i in 2:length(x)) {
if (x[i]==(x[i-1]+1)) {
blocks[[k]] <- c(blocks[[k]], x[i])
} else {
k <- k+1
blocks[[k]] <- x[i]
}
}
blocks
}
########################################################################
# Take an R color and return an HSSFColor object
# @param Rcolor is a string
# NOTE: Only a limited set of colors are supported. See the java API.
#
.hssfcolor <- function(Rcolor)
{
.jshort(INDEXED_COLORS_[toupper( Rcolor )])
}
########################################################################
# Take an R color and return an XSSFColor object
# @param Rcolor is a string returned from "colors()" or a hex string
# starting with #, e.g. "#FF0000" is red.
#
#' @importFrom grDevices col2rgb
.xssfcolor <- function(Rcolor)
{
if (grepl("^#", Rcolor)) {
rgb <- c(strtoi(substring(Rcolor, 2, 3), base=16L),
strtoi(substring(Rcolor, 4, 5), base=16L),
strtoi(substring(Rcolor, 6, 7), base=16L))
} else {
rgb <- as.integer(col2rgb(Rcolor))
}
jcol <- .jnew("java.awt.Color", rgb[1], rgb[2], rgb[3])
.jnew("org.apache.poi.xssf.usermodel.XSSFColor", jcol)
}
#' Set Java Temp Directory
#'
#' Java sets the java temp directory to `/tmp` by default. However, this is
#' usually not desirable in R. As a result, this function allows changing that
#' behavior. Further, this function is fired on package load to ensure all
#' temp files are written to the R temp directory.
#'
#' On package load, we use `getOption("xlsx.tempdir", tempdir())` for the
#' default value, in case you want to have this value set by an option.
#'
#' @param tmp_dir optional. The new temp directory. Defaults to the R temp
#' directory
#'
#' @return The previous java temp directory (prior to any changes).
#'
#' @export
set_java_tmp_dir <- function(tmp_dir = tempdir()) {
rJava::.jcall(
"java/lang/System",
"Ljava/lang/String;",
"setProperty",
"java.io.tmpdir", tmp_dir
)
}
#' @rdname set_java_tmp_dir
#' @export
get_java_tmp_dir <- function() {
rJava::.jcall(
"java/lang/System",
"Ljava/lang/String;",
"getProperty",
"java.io.tmpdir"
)
}
#' @title Constants used in the project.
#'
#' @description Document some Apache POI constants used in the project.
#'
#' @return A named vector.
#' @author Adrian Dragulescu
#' @seealso \code{\link{CellStyle}} for using the \code{POI_constants}.
#' @name POI_constants
NULL
#' @rdname POI_constants
#' @export
HALIGN_STYLES_ <- c(2,6,4,0,5,1,3)
names(HALIGN_STYLES_) <- c('ALIGN_CENTER' ,'ALIGN_CENTER_SELECTION'
,'ALIGN_FILL' ,'ALIGN_GENERAL' ,'ALIGN_JUSTIFY' ,'ALIGN_LEFT'
,'ALIGN_RIGHT')
#' @rdname POI_constants
#' @export
VALIGN_STYLES_<- c(2,1,3,0)
names(VALIGN_STYLES_) <- c('VERTICAL_BOTTOM' ,'VERTICAL_CENTER',
'VERTICAL_JUSTIFY' ,'VERTICAL_TOP')
#' @rdname POI_constants
#' @export
BORDER_STYLES_ <- c(9,11,3,7,6,4,2,10,12,8,0,13,5,1)
names(BORDER_STYLES_) <- c("BORDER_DASH_DOT", "BORDER_DASH_DOT_DOT",
"BORDER_DASHED", "BORDER_DOTTED", "BORDER_DOUBLE", "BORDER_HAIR",
"BORDER_MEDIUM", "BORDER_MEDIUM_DASH_DOT",
"BORDER_MEDIUM_DASH_DOT_DOT", "BORDER_MEDIUM_DASHED",
"BORDER_NONE", "BORDER_SLANTED_DASH_DOT", "BORDER_THICK",
"BORDER_THIN")
#' @rdname POI_constants
#' @export
FILL_STYLES_<- c(3,9,10,16,2,18,17,0,1,4,15,7,8,5,6,13,14,11,12)
names(FILL_STYLES_) <- c('ALT_BARS', 'BIG_SPOTS','BRICKS' ,'DIAMONDS'
,'FINE_DOTS' ,'LEAST_DOTS' ,'LESS_DOTS' ,'NO_FILL'
,'SOLID_FOREGROUND' ,'SPARSE_DOTS' ,'SQUARES'
,'THICK_BACKWARD_DIAG' ,'THICK_FORWARD_DIAG' ,'THICK_HORZ_BANDS'
,'THICK_VERT_BANDS' ,'THIN_BACKWARD_DIAG' ,'THIN_FORWARD_DIAG'
,'THIN_HORZ_BANDS' ,'THIN_VERT_BANDS')
# from org.apache.poi.ss.usermodel.CellStyle
#' @rdname POI_constants
#' @export
CELL_STYLES_ <- c(HALIGN_STYLES_, VALIGN_STYLES_,
BORDER_STYLES_, FILL_STYLES_)
#' @rdname POI_constants
#' @export
INDEXED_COLORS_ <- c(8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,
25,26,28,29,30,31,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,
56,57,58,59,60,61,62,63,64)
names(INDEXED_COLORS_) <- c('BLACK' ,'WHITE' ,'RED' ,'BRIGHT_GREEN'
,'BLUE' ,'YELLOW' ,'PINK' ,'TURQUOISE' ,'DARK_RED' ,'GREEN'
,'DARK_BLUE' ,'DARK_YELLOW' ,'VIOLET' ,'TEAL' ,'GREY_25_PERCENT'
,'GREY_50_PERCENT' ,'CORNFLOWER_BLUE' ,'MAROON' ,'LEMON_CHIFFON'
,'ORCHID' ,'CORAL' ,'ROYAL_BLUE' ,'LIGHT_CORNFLOWER_BLUE'
,'SKY_BLUE' ,'LIGHT_TURQUOISE' ,'LIGHT_GREEN' ,'LIGHT_YELLOW'
,'PALE_BLUE' ,'ROSE' ,'LAVENDER' ,'TAN' ,'LIGHT_BLUE' ,'AQUA'
,'LIME' ,'GOLD' ,'LIGHT_ORANGE' ,'ORANGE' ,'BLUE_GREY'
,'GREY_40_PERCENT' ,'DARK_TEAL' ,'SEA_GREEN' ,'DARK_GREEN'
,'OLIVE_GREEN' ,'BROWN' ,'PLUM' ,'INDIGO' ,'GREY_80_PERCENT'
,'AUTOMATIC')