new_adapters: Create a new 'adapters' class object
In a-maldet/readall: Read FWF, DSV, EXCEL And SAS Files

Description Usage Arguments Value adapters See Also

This class holds a list of adapter functions and their function description and is usually stored inside of a file_definition or a file_structure class object.

1	new_adapters(..., description = NULL)

`...`	Either single list argument is passed to `new_adapters()` (e.g. `new_adapters(list(fun1, fun2, ...))`), where each list argument is an adapter function, or multiple functions are directly passed to `new_adapters()` (e.g. `new_adapters(fun1, fun2, ...)`).
`description`	An optional character vector that must have the same length as the number of passed in adapter functions. If omitted then non-standard-evaluation will be used in order to capture the function name if possible. If a passed in function is not stored with a function name, then `NA_character_` will be used instead.

An adapters class object, holding a list of adapter functions and their descriptions.

An adapter function is a function that takes a data.frame as input argument and returns a modified version of this data.frame. The adapter functions are stored in an adapters class object, which is a special list that contains all adapter functions and a description text of each function. This class objects can be created by using the function new_adapters(). The adapters class objects can be added to a file_structure or a file_definition or a file_collection class object. After reading a data file (by calling read_data(file_definition)) all adapter functions listed in the adapters argument of the file_definition]new_file_definition() class object will be applied consecutively to the loaded data set. Adapter functions can be added to an existing file_structure or a file_definition or a file_collection class object by using the function add_adapters(). Adapter functions can be used for several tasks:

adapt the data sets in such a way that they can be concatenated for mutliple years
compute new variables from existing variables
fix errors in variables
transform the values of a variable of an older data set, such that it complies with a newer variable definition

add_adapters(), apply_adapters()

a-maldet/readall documentation built on Dec. 18, 2021, 9:23 p.m.