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# October 26, 2018
#' Class \code{CVInfo}
#'
#' Class \code{CVInfo} holds cross-validation procedure results
#'
#' @name CVInfo-class
#'
#' @slot value Values obtained for each parameter combination
#' @slot params list of parameter values considered
#' @slot optimal list of optimal parameter values
#'
#' @keywords internal
#'
#' @include N_CVBasic.R
setClass(Class = "CVInfo",
slots = c(value = "ANY",
params = "list",
optimal = "list"))
#' Create a CVInfo Object
#'
#' Dispatch appropriate cross-validation procedure.
#'
#' @rdname newCVInfo
#'
#' @param lambdas tuning parameters
#' @param kernel kernel object
#'
#' @keywords internal
setGeneric(name = ".newCVInfo",
def = function(lambdas, kernel, ...) {
standardGeneric(f = ".newCVInfo")
})
#' @rdname DynTxRegime-internal-api
setGeneric(name = ".getValue",
def = function(object) { standardGeneric(f = ".getValue") })
#' @rdname DynTxRegime-internal-api
setGeneric(name = ".getOptimal",
def = function(object) { standardGeneric(f = ".getOptimal") })
#' Extract Cross-Validation Results
#'
#' Extract cross-validation results from the value object returned by a
#' weighted learning statistical method of DynTxRegime.
#'
#' Methods are developed for all weighted learning methods implemented in
#' DynTxRegime. Specifically, OWL, RWL, BOWL, and EARL.
#'
#' @param object A value object returned by a weighted learning statistical
#' method of DynTxRegime
#' @param ... Ignored.
#'
#' @usage
#'
#' cvInfo(object, ...)
#'
#' @name cvInfo
#'
#' @exportMethod cvInfo
setGeneric(name = "cvInfo",
def = function(object, ...) { standardGeneric(f = "cvInfo") })
##########
## METHODS
##########
#' Methods Available for Objects of Class \code{CVInfo}
#'
#' @name CVInfo-methods
#'
#' @keywords internal
NULL
#' @rdname newCVInfo
setMethod(f = ".newCVInfo",
signature = c(lambdas = "ANY",
kernel = "ANY"),
definition = function(lambdas, kernel, ...) { stop("not allowed") })
#' \code{.getPars}
#' retrieves parameters considered in cross-validation.
#'
#' @rdname CVInfo-methods
setMethod(f = ".getPars",
signature = c(object = "CVInfo"),
definition = function(object) { return(object@params) })
#' \code{.getOptimal}
#' retrieves optimal parameters identified in cross-validation.
#'
#' @rdname CVInfo-methods
setMethod(f = ".getOptimal",
signature = c(object = "CVInfo"),
definition = function(object) { return(object@optimal) })
#' \code{.getValue}
#' retrieves values obtained in cross-validation.
#'
#' @rdname CVInfo-methods
setMethod(f = ".getValue",
signature = c(object = "CVInfo"),
definition = function(object) { return( object@value ) })
#' \code{cvInfo}
#' retrieves cross-validation information.
#'
#' @rdname CVInfo-methods
setMethod(f = "cvInfo",
signature = c(object = "CVInfo"),
definition = function(object) { return( object@value ) })
#' \code{print}
#' print cross-validation results.
#'
#' @rdname CVInfo-methods
setMethod(f = "print",
signature = c(x = "CVInfo"),
definition = function(x, ...) { print(x = x@value, ...) })
#' \code{show}
#' display cross-validation results.
#'
#' @rdname CVInfo-methods
setMethod(f = "show",
signature = c(object = "CVInfo"),
definition = function(object) { show(object@value) })
#' \code{summary}
#' summarize cross-validation results.
#'
#' @rdname CVInfo-methods
setMethod(f = "summary",
signature = c(object = "CVInfo"),
definition = function(object, ...) { return( object@value ) })
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