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#' Set or Query Data and Parameters
#'
#' This function is used to set or query parameters and their attributes.
#'
#' @param option character.
#' Parameter name, see \sQuote{Parameters} section.
#' @param value
#' Parameter value specified for \code{option} (optional)
#' @param which.attr character.
#' A non-empty character string specifying which attribute is to be accessed.
#' @param clear.proj logical.
#' If true, basic graphical user interface (\acronym{GUI}) preferences will be saved and all other data removed.
#' @param clear.data logical.
#' If true, only datasets will be removed.
#' @param replace.all list.
#' A replacement list of parameter values.
#'
#' @section Data:
#' Imported unprocessed data is saved to the data frame \code{data.raw}, see \code{\link{ImportText}}.
#' Processed point data is saved to the data frame \code{data.pts},
#' and interpolated surface data is saved to the list \code{data.grd}.
#'
#' @section Parameters:
#' Parameters undefined elsewhere in the help documentation include:
#' \describe{
#' \item{\code{ver}}{package version number}
#' \item{\code{win.loc}}{default horizontal and vertical location for \acronym{GUI} placement in pixels.}
#' }
#'
#' @return If \code{value} is given, the object specified by \code{option} is returned.
#' A \code{NULL} value is returned for objects not yet assigned a value and where no default value is available.
#' Default values are specified internally within this function.
#'
#' @author J.C. Fisher, U.S. Geological Survey, Idaho Water Science Center
#'
#' @keywords sysdata
#'
#' @export
#'
#' @examples
#' # set a parameter
#' Data("test1", 3.14159265)
#' Data("test2", list(id = "PI", val = 3.14159265))
#'
#' # retrieve a parameter value
#' Data("test1")
#' Data("test2")
#' Data(c("test2", "id"))
#' Data(c("test2", "val"))
#'
#' # get all parameter values
#' d <- Data()
#'
#' # remove all saved parameter values
#' Data(replace.all = list())
#'
#' # recover saved parameter values
#' Data(replace.all = d)
#'
Data <- local({
# store data locally
dat <- list()
# set default values
default <- list("win.loc" = NULL,
"default.dir" = getwd(),
"palette.pts" = function(n, c=80, l=60, start=0, end=300) {
colorspace::rainbow_hcl(n, c, l, start, end)
},
"palette.grd" = function(n, h=c(300, 75), c.=c(35, 95), l=c(15, 90),
power=c(0.8, 1.2)) {
colorspace::heat_hcl(n, h, c., l, power)
},
"crs" = sp::CRS(as.character(NA)),
"sep" = "\t",
"cex.pts" = 1,
"nlevels" = NULL,
"asp.yx" = NULL,
"asp.zx" = NULL,
"legend.loc" = NULL,
"scale.loc" = NULL,
"arrow.loc" = NULL,
"scale.loc" = NULL,
"bg.lines" = 0,
"useRaster" = 1,
"contour.lines" = 0,
"dms.tick" = 0,
"make.intervals" = 0,
"proportional" = 0,
"quantile.breaks" = 0,
"draw.key" = 0,
"max.dev.dim" = c(43L, 56L))
function(option, value, which.attr=NULL, clear.proj=FALSE, clear.data=FALSE, replace.all=NULL) {
# replace all values
if (is.list(replace.all)) {
dat <<- replace.all
return(invisible())
}
# save parameters
if (clear.proj || clear.data) {
save.params <- if (clear.data) names(default) else c("win.loc", "default.dir")
save.params <- save.params[save.params %in% names(dat)]
dat <<- sapply(save.params, function(i) list(dat[[i]]))
return(invisible())
}
# return all data
if (missing(option)) return(dat)
# check indices for numeric option elements
if (is.numeric(option)) {
option <- sapply(option, as.integer)
option.new <- option[1L]
if (option.new > length(dat)) option.new <- NULL
if (!is.null(option.new) && length(option) > 1) {
for (i in 2:length(option)) {
if (option[i] > length(dat[[option.new[-i]]]))
break
else
option.new <- c(option.new, option[i])
}
}
# determine numeric indices from character option element
} else {
idx <- match(option[1], names(dat))
option.new <- idx
if (is.na(option.new)) option.new <- NULL
if (!is.null(option.new) && length(option) > 1) {
for (i in 2:length(option)) {
idx <- match(option[i], names(dat[[option.new[-i]]]))
if (is.na(idx)) break
option.new <- c(option.new, idx)
}
}
}
# determine number of options
noption <- length(option)
noption.new <- length(option.new)
# return value
if (missing(value)) {
if (noption.new < noption) {
if (noption == 1 && option %in% names(default))
return(default[[option]])
else
return(NULL)
}
if (is.null(which.attr))
return(dat[[option.new]])
else
return(attr(dat[[option.new]], which.attr, exact=TRUE))
# set value
} else {
if (noption.new == noption || (noption.new == (noption - 1)
&& is.list(if (is.null(option.new)) dat else dat[[option.new]]))) {
if (is.null(which.attr))
dat[[option]] <<- value
else
attr(dat[[option]], which.attr) <<- value
}
}
}
})
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