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### =========================================================================
### CRUDProtocol objects
### -------------------------------------------------------------------------
### Implements a specific REST protocol (like HTTP).
.CRUDProtocol <- setRefClass("CRUDProtocol")
.CRUDProtocol$methods(create = function(x, ..., value) {
unimplemented("create")
})
unimplemented <- function(x) {
stop("This protocol does not implement the '", x, "' operation")
}
### - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
### Constructor
###
### FIXME: may be incomplete
availableCRUDProtocols <- function() {
names(getClass("CRUDProtocol")@subclasses)
}
CRUDProtocol <- function(uri, ...) {
if (!isSingleString(uri)) {
stop("'uri' must be a single, non-NA string")
}
protocol <- toupper(parseURI(uri)$scheme)
if (!protocol %in% availableCRUDProtocols()) {
stop("Unsupported CRUD protocol: ", protocol)
}
match.fun(protocol)(...)
}
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