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#' Constraints class
#' @description R6 class with constraints.
#'
#' The constraints property on Table Schema Fields can be used by consumers to list constraints for
#' validating field values. For example, validating the data in a Tabular Data Resource against
#' its Table Schema; or as a means to validate data being collected or updated via a data entry interface.
#'
#' All constraints \code{MUST} be tested against the logical representation of data, and the physical
#' representation of constraint values \code{MAY} be primitive types as possible in JSON,
#' or represented as strings that are castable with the type and format rules of the field.
#'
#'
#' @docType class
#' @importFrom R6 R6Class
#' @export
#' @keywords data
#' @return Object of \code{\link{R6Class}} .
#' @format \code{\link{R6Class}} object.
#'
#' @field constraints see Section See Also
#'
#' @include constraints.checkEnum.R
#' @include constraints.checkMaximum.R
#' @include constraints.checkMaxLength.R
#' @include constraints.checkMinimum.R
#' @include constraints.checkMinLength.R
#' @include constraints.checkPattern.R
#' @include constraints.checkRequired.R
#' @include constraints.checkUnique.R
#'
#' @seealso \href{https://specs.frictionlessdata.io//table-schema/#constraints}{Constraints specifications},
#' \code{\link{constraints.checkEnum}},
#' \code{\link{constraints.checkMaximum}},
#' \code{\link{constraints.checkMaxLength}},
#' \code{\link{constraints.checkMinimum}},
#' \code{\link{constraints.checkMinLength}},
#' \code{\link{constraints.checkPattern}},
#' \code{\link{constraints.checkRequired}},
#' \code{\link{constraints.checkUnique}}
Constraints <- R6Class("Constraints", public = list(constraints = list(
checkEnum = constraints.checkEnum,
checkMaximum = constraints.checkMaximum,
checkMaxLength = constraints.checkMaxLength,
checkMinimum = constraints.checkMinimum,
checkMinLength = constraints.checkMinLength,
checkPattern = constraints.checkPattern,
checkRequired = constraints.checkRequired,
checkUnique = constraints.checkUnique
)))
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