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library(ncdf4)
library(abind)
source('~/easyNCDF/R/Utils.R')
NcOpen <- function(file_path) {
result <- NULL
try({
result <- nc_open(file_path)
}, silent = TRUE)
result
}
NcClose <- function(file_object) {
result <- NULL
try({
result <- nc_close(file_object)
})
invisible(result)
}
NetCDFReadDims <- function(file_to_read, var_names = NULL) {
file_opener <- nc_open
file_closer <- nc_close
close <- FALSE
if (is.character(file_to_read)) {
file_object <- file_opener(file_to_read)
file_path <- file_to_read
close <- TRUE
} else if (grepl('^ncdf', class(file_to_read))) {
file_object <- file_to_read
file_path <- file_object$filename
} else {
stop("Either the path to a NetCDF file or a ncdf object must be provided as 'file_to_read'.")
}
# Check var_names
if (!is.null(var_names)) {
if (!is.character(var_names)) {
stop("Parameter 'var_names' must be a vector of character strings or NULL.")
}
}
dims <- NULL
if (!is.null(file_object)) {
extra_dimvars <- NULL
# Create all variables that are 'dimvars'
for (dim_name in names(file_object$dim)) {
if (file_object$dim[[dim_name]]$create_dimvar) {
new_var <- list(name = dim_name, ndims = 1,
size = file_object$dim[[dim_name]]$len,
units = file_object$dim[[dim_name]]$units,
dim = list(file_object$dim[[dim_name]]))
file_object$var[[dim_name]] <- new_var
file_object$nvars <- file_object$ncars + 1
extra_dimvars <- c(extra_dimvars, dim_name)
}
}
if (is.null(var_names)) {
var_names <- names(file_object$var)
}
for (var_name in var_names) {
if (!(var_name %in% names(file_object$var))) {
stop("Could not find the variable '", var_name, "' in the file.")
}
found_dims <- file_object$var[[var_name]]$size
names(found_dims) <- sapply(file_object$var[[var_name]]$dim, '[[', 'name')
new_dim <- c(var = 1)
found_dims <- c(new_dim, found_dims)
if (!is.null(dims)) {
dims <- .MergeArrayDims(dims, found_dims)
dims <- pmax(dims[[1]], dims[[2]])
} else {
dims <- found_dims
}
}
}
if (close) {
file_closer(file_object)
}
dims
}
NetCDFToArray <- function(file_to_read, var_names, drop_var_dim = FALSE) {
# unlist = TRUE) {
file_opener <- NcOpen
file_closer <- NcClose
file_dim_reader <- NetCDFReadDims
close <- FALSE
if (is.character(file_to_read)) {
file_object <- file_opener(file_to_read)
file_path <- file_to_read
close <- TRUE
} else if (grepl('^ncdf', class(file_to_read))) {
file_object <- file_to_read
file_path <- file_object$filename
} else {
stop("Either the path to a NetCDF file or a ncdf object must be provided as 'file_to_read'.")
}
# Check var_names
# if (is.character(var_names)) {
# var_names <- list(var_names)
# }
# print_error <- FALSE
# if (is.list(var_names)) {
# if (!all(sapply(var_names, is.character))) {
# print_error <- TRUE
# }
# } else {
# print_error <- TRUE
# }
# if (print_error) {
# stop("Parameter 'var_names' must be one or a list of vectors of character strings or NULL.")
# }
if (!is.character(var_names)) {
stop("Parameter 'var_names' must be a vector of character strings.")
}
# result_list <- NULL
# for (var_names_vector in var_names) {
result <- NULL
if (!is.null(file_object)) {
# Create all variables that are 'dimvars'
extra_dimvars <- NULL
extra_dimvars_list <- NULL
for (dim_name in names(file_object$dim)) {
if (file_object$dim[[dim_name]]$create_dimvar) {
new_var <- list(name = dim_name, ndims = 1,
size = file_object$dim[[dim_name]]$len,
units = file_object$dim[[dim_name]]$units,
dim = list(file_object$dim[[dim_name]]))
new_var_extra_atts <- ncatt_get(file_object, dim_name)
new_var[names(new_var_extra_atts)] <- new_var_extra_atts
extra_dimvars_list <- c(extra_dimvars_list, setNames(list(new_var), dim_name))
extra_dimvars <- c(extra_dimvars, dim_name)
}
}
#file_object$var[extra_dimvars] <- extra_dimvars_list
#file_object$nvars <- file_object$nvars + length(extra_dimvars)
# for (var_name in var_names_vector) {
for (var_name in var_names) {
if (var_name %in% extra_dimvars) {
var_result <- file_object$dim[[var_name]]$vals
#atts <- file_object$dim[[var_name]]
atts <- extra_dimvars_list[[var_name]]
atts_to_remove <- c('vals', 'name', 'len', 'group_index',
'group_id', 'id', 'dimvarid', 'create_dimvar')
if (any(names(atts) %in% atts_to_remove)) {
atts <- atts[-which(names(atts) %in% atts_to_remove)]
}
units <- file_object$dim[[var_name]]$units
names(dim(var_result)) <- sapply(extra_dimvars_list[[var_name]]$dim, '[[', 'name')
} else {
if (!(var_name %in% names(file_object$var))) {
stop("Could not find the variable '", var_name, "' in the file.")
}
try({
var_result <- ncvar_get(file_object, var_name)
}, silent = TRUE)
atts <- file_object$var[[var_name]]
atts_to_remove <- c('id', 'name', 'ndims', 'natts', 'size',
'dimids', 'group_index', 'chunksizes',
'storage', 'shuffle', 'compression', 'dims',
'varsize', 'longname')
if (any(names(atts) %in% atts_to_remove)) {
atts <- atts[-which(names(atts) %in% atts_to_remove)]
}
extra_atts <- ncatt_get(file_object, var_name)
atts[names(extra_atts)] <- extra_atts
units <- file_object$var[[var_name]]$units
names(dim(var_result)) <- sapply(file_object$var[[var_name]]$dim, '[[', 'name')
}
if (units %in% c('seconds', 'minutes', 'hours', 'days', 'weeks', 'months', 'years')) {
if (units == 'seconds') {
units <- 'secs'
} else if (units == 'minutes') {
units <- 'mins'
}
var_result[] <- paste(var_result, units)
} else if (grepl(' since ', units)) {
parts <- strsplit(units, ' since ')[[1]]
units <- parts[1]
if (units == 'seconds') {
units <- 'secs'
} else if (units == 'minutes') {
units <- 'mins'
}
var_result <- seq(as.POSIXct(parts[2]), length = max(var_result, na.rm = TRUE) + 1, by = units)[var_result + 1]
}
# if (!drop_var_dim && (length(var_names_vector) == 1)) {
if (!drop_var_dim && (length(var_names) == 1)) {
dim(var_result) <- c(c(var = 1), dim(var_result))
}
attr(var_result, 'variables') <- structure(list(atts), .Names = var_name)
## TODO: Take the general attributes out of atts and put them as
## global attributes.
if (is.null(result)) {
result <- var_result
} else {
new_attrs <- c(attr(result, 'variables'),
attr(var_result, 'variables'))
result <- .MergeArrays(result, var_result, 'var')
attr(result, 'variables') <- new_attrs
}
}
}
# if (is.null(result_list)) {
# if (length(var_names) == 1 && simplify) {
# result_list <- result
# } else {
# if (length(var_names_vector) == 1) {
# result_list <- structure(list(result), .Names = var_names_vector)
# } else {
# result_list <- list(result)
# }
# }
# } else {
# if (length(var_names_vector) == 1) {
# result_list <- do.call('[[<-', list(x = result_list,
# i = var_names_vector,
# value = result))
# } else {
# result_list <- do.call('[[<-', list(x = result_list,
# i = length(result_list) + 1,
# value = result))
# }
# }
# }
if (close) {
file_closer(file_object)
}
# result_list
result
}
# Parameter 'file_selectos' expects a named character vector of single
# file dimension selectors.
# Parameter 'inner_selectors' expects a named list of numeric vectors.
.NcDataReader <- function(file_path = NULL, file_object = NULL,
file_selectors = NULL, inner_indices,
file_opener = NULL, file_closer = NULL) {
file_dim_reader <- .NcDimReader
#print("aa")
close <- FALSE
if (is.null(file_object)) {
if (is.null(file_path)) {
stop("Either 'file_path' or 'file_object' must be provided.")
}
if (is.null(file_opener) || is.null(file_closer)) {
stop("Both 'file_opener' and 'file_closer' must be provided if ",
"no 'file_object' is directly provided.")
} else if (!is.function(file_opener) || !is.function(file_closer)) {
stop("Parameters 'file_opener' and 'file_closer' must be functions.")
}
file_object <- file_opener(file_path)
close <- !is.null(file_object)
} else {
file_path <- file_object$filename
}
result <- NULL
if (!is.null(file_object)) {
var_names <- NULL
var_dim_name <- NULL
if (any(c('var', 'variable') %in% c(names(file_selectors), names(inner_indices)))) {
var_dim_name <- c('var', 'variable')[which(c('var', 'variable') %in% c(names(file_selectors), names(inner_indices)))]
if (var_dim_name %in% names(file_selectors)) {
if (is.character(file_selectors[[var_dim_name]])) {
var_names <- file_selectors[[var_dim_name]]
}
} else if (var_dim_name %in% names(inner_indices)) {
var_names <- names(file_object$var)
if (is.character(inner_indices[[var_dim_name]])) {
var_names <- inner_indices[[var_dim_name]][which(inner_indices[[var_dim_name]] %in% var_names)]
} else if (is.numeric(inner_indices[[var_dim_name]])) {
if (any(inner_indices[[var_dim_name]] > length(var_names)) ||
any(inner_indices[[var_dim_name]] < 0)) {
stop("Selectors out of range for '", var_dim_name, "'.")
}
var_names <- var_names[inner_indices[[var_dim_name]]]
} else {
stop("Selectors for '", var_dim_name, "' must be numeric or ",
"character strings.")
}
}
}
if (is.null(var_names)) {
if (length(file_object$var) == 1) {
var_names <- names(file_object$var)[1]
} else {
stop(paste0("Could not disambiguate which variable in the file ",
"is being requested. Either provide the parameter ",
"'var'/'variable' or force the file to contain only ",
"one variable.\n", file_path))
}
}
result <- try({
res <- NULL
metadata <- NULL
dims <- file_dim_reader(file_path, file_object, file_selectors,
inner_indices)
#print("bb")
if (!all(names(inner_indices) %in% names(dims))) {
stop("Missing dimensions in the file.\nExpected: ",
paste(names(inner_indices), collapse = ', '), "\n",
"Found: ", paste(names(dims), collapse = ', '), "\n",
file_path)
}
extra_dims <- NULL
if (length(dims) > length(inner_indices)) {
common_dims <- which(names(dims) %in% names(inner_indices))
if (length(common_dims) > 0) {
extra_dims <- dims[-common_dims]
} else {
extra_dims <- dims
}
if (any(extra_dims != 1)) {
stop("Unexpected extra dimensions (of length > 1) in the file.\nExpected: ",
paste(names(inner_indices), collapse = ', '), "\n",
"Found: ", paste(names(dims), collapse = ', '), "\n",
file_path)
} else {
inner_indices[names(extra_dims)] <- rep(1, length(extra_dims))
}
extra_dims <- names(extra_dims)
}
any_empty_selectors <- FALSE
# Here we are allowing for indices out of range (simply discarding them).
for (inner_dim in names(inner_indices)) {
inds_out_of_range <- which(inner_indices[[inner_dim]] > dims[inner_dim])
if (length(inds_out_of_range) > 0) {
inner_indices[[inner_dim]] <- inner_indices[[inner_dim]][-which(inner_indices[[inner_dim]] > dims[inner_dim])]
}
if (length(inner_indices[[inner_dim]]) == 0) {
any_empty_selectors <- TRUE
}
if (any(inner_indices[[inner_dim]] < 0)) {
stop("Invalid indices provided for '", inner_dim, "'.")
}
}
if (!any_empty_selectors) {
missing_dims <- NULL
if (length(dims) < length(inner_indices)) {
missing_dim_names <- names(inner_indices)[-which(names(inner_indices) %in% names(dims))]
missing_dim_indices <- lapply(missing_dim_names, function(x) inner_indices[[x]])
if (any(!sapply(missing_dim_indices, identical, 1))) {
stop("Could not find all expected dimensions in the file.\nExpected: ",
paste(names(inner_indices), collapse = ', '), "\n",
"Found: ", paste(names(dims), collapse = ', '), "\n",
file_path)
} else {
original_dims <- sapply(inner_indices, length)
names(original_dims) <- names(inner_indices)
inner_indices <- inner_indices[-which(names(inner_indices) %in% missing_dim_names)]
}
missing_dims <- missing_dim_names
}
#print("cc")
inner_dims <- names(inner_indices)
reorder <- NULL
if (any(names(dims) != inner_dims)) {
reorder <- sapply(names(dims), function(x) which(inner_dims == x))
reorder_back <- sapply(inner_dims, function(x) which(names(dims) == x))
inner_indices <- inner_indices[reorder]
}
if (!is.null(var_dim_name) && (var_dim_name %in% names(inner_indices))) {
inner_indices <- inner_indices[-which(names(inner_indices) == var_dim_name)]
}
for (var_name in var_names) {
tmp <- do.call('[', c(list(ncvar_get(file_object, var_name, sapply(inner_indices, min),
sapply(inner_indices, max) - sapply(inner_indices, min) + 1,
collapse_degen = FALSE)),
lapply(inner_indices, function(x) x - min(x) + 1), list(drop = FALSE)))
if (!is.null(var_dim_name) && (var_dim_name %in% inner_dims)) {
dim(tmp) <- c(dim(tmp)[which(1:length(dim(tmp)) < which(inner_dims == var_dim_name))], 1,
dim(tmp)[which(1:length(dim(tmp)) >= which(inner_dims == var_dim_name))])
if (is.null(res)) {
res <- tmp
} else {
res <- abind(res, tmp, along = which(inner_dims == var_dim_name))
}
} else {
res <- tmp
}
metadata <- c(metadata, structure(list(file_object$var[[var_name]]), .Names = var_name))
}
if (!is.null(reorder)) {
res <- aperm(res, reorder_back)
}
if (!is.null(missing_dims)) {
dim(res) <- original_dims
}
if (!is.null(extra_dims)) {
dim(res) <- dim(res)[-which(inner_dims %in% extra_dims)]
}
attr(res, 'variables') <- metadata
names(dim(res)) <- inner_dims
## TODO: Take the common parts in metadata and put them as
## global attributes.
}
#print("dd")
res
})
if ('try-error' %in% class(result)) {
result <- NULL
}
}
if (close) {
file_closer(file_object)
}
result
}
nc2a <- NetCDFToArray