Internal utilities for item/concept objects — prepare

Several internal utilities for modifying, querying ans subsetting item and concept objects, including getters and setters for itm variables, callback functions, cncpt target classes, as well as utilities for data loading such as prepare_query() which creates a row-subsetting expression, do_callback(), which applies a callback function to data or do_itm_load(), which performs data loading corresponding to an itm

prepare_query(x)

try_add_vars(x, ..., var_lst = NULL, type = c("data_vars", "meta_vars"))

get_itm_var(x, var = NULL, type = c("data_vars", "meta_vars"))

set_callback(x, fun)

do_callback(x, ...)

do_itm_load(x, id_type = "icustay", interval = hours(1L))

n_tick(x)

set_target(x, target)

get_target(x)

subset_src(x, src)

# S3 method for item
subset_src(x, src)

# S3 method for cncpt
subset_src(x, src)

# S3 method for concept
subset_src(x, src)

Arguments

x: Object defining the row-subsetting
...: Variable specification
var_lst: List-based variable specification
type: Variable type (either data or meta)
var: Variable name (NULL) returns all available
fun: Callback function (passed as string)
id_type: String specifying the patient id type to return
interval: The time interval used to discretize time stamps with, specified as base::difftime() object
src: Character vector of data source name(s)

Value

prepare_query(): an unevaluated expression used for row-subsetting
try_add_vars(): a (potentially) modified item object with added variables
get_itm_var(): character vector of itm variables
set_callback(): a modified object with added callback function
do_callback(): result of the callback function applied to data, most likely (id_tbl/ts_tbl)
do_itm_load(): result of item loading (id_tbl/ts_tbl)
n_tick(): Integer valued number of progress bar ticks
set_target(): a modified object with newly set target class
get_target(): string valued target class of an object
subset_src(): an object of the same type as the object passed as x