coerceListToS4: Simple utility function to convert an list to an S4 object

In sckott/XMLSchema: R facilities to read XML schema

Description

This is a utility function that allows us to convert a named collection of values in the form of a list (or vector) to an S4 object. This is used to simplify calls to SOAP methods that expect a structured object of an S4 class by allowing us to group the slots in a list.

Usage

coerceListToS4(.x = list(...), .obj, ..., .partialMatch = TRUE, .coerce = TRUE)

Arguments

.x	the R list containing the named elements that map to the slots in the S4 object
.obj	an instance of the S4 object or the name of an S4 class.
...	named elements which act as slots. This allows the caller to avoid collecting these elements into a list.
.partialMatch	a logical value that controls whether we match the names of the elements in the list to slot names in the class using partial matching or exact matching.
.coerce	a logical value that controls whether we coerce each slot to its defined type.

Value

The obj object with any slots filled in from the the list x.

Author(s)

Duncan Temple Lang

Examples

   setClass("Bar", representation(x = "logical", y = "data.frame"))
   setClass("Foo", representation(a = "numeric", b = "integer", c = "character",
                                   d = "Bar"))

   coerceListToS4(list(a = 1, b = 4:9), new("Foo"))
   coerceListToS4(list(a = 1, b = 4:9, d = coerceListToS4(list(y = mtcars), new("Bar"))),  new("Foo"))

     # here we drop the new() and the list() but note that we have to
     # indicate that the class name should match the second parameter
     # with an extra ,
   coerceListToS4(a = 1, b = 4:9, d = coerceListToS4(y = mtcars, , "Bar"), , "Foo")

sckott/XMLSchema documentation built on May 29, 2019, 3:46 p.m.