#' @include DataBackend.R
DataBackendRename = R6Class("DataBackendRename", inherit = DataBackend, cloneable = FALSE,
public = list(
old = NULL,
new = NULL,
initialize = function(b, old, new) {
super$initialize(data = b, b$primary_key, "data.table")
assert_character(old, any.missing = FALSE, unique = TRUE)
assert_subset(old, b$colnames)
assert_character(new, any.missing = FALSE, len = length(old))
assert_names(new, "strict")
ii = old != new
self$old = old[ii]
self$new = new[ii]
},
data = function(rows, cols, data_format = self$data_formats[1L]) {
assert_atomic_vector(rows)
assert_names(cols, type = "unique")
b = private$.data
cols = map_values(intersect(cols, self$colnames), self$new, self$old)
data = b$data(rows, cols, data_format)
set_col_names(data, map_values(names(data), self$old, self$new))
},
head = function(n = 6L) {
data = private$.data$head(n)
set_col_names(data, map_values(names(data), self$old, self$new))
},
distinct = function(rows, cols, na_rm = TRUE) {
cols = map_values(intersect(cols, self$colnames), self$new, self$old)
x = private$.data$distinct(rows, cols, na_rm = na_rm)
set_names(x, map_values(names(x), self$old, self$new))
},
missings = function(rows, cols) {
cols = map_values(intersect(cols, self$colnames), self$new, self$old)
x = private$.data$missings(rows, cols)
set_names(x, map_values(names(x), self$old, self$new))
}
),
active = list(
rownames = function() {
private$.data$rownames
},
colnames = function() {
x = private$.data$colnames
map_values(x, self$old, self$new)
},
nrow = function() {
private$.data$nrow
},
ncol = function() {
private$.data$ncol
}
),
private = list(
.calculate_hash = function() {
hash(self$old, self$new, private$.data$hash)
}
)
)
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