Nothing
#' GMLMultiCurve
#'
#' @docType class
#' @importFrom R6 R6Class
#' @export
#' @keywords ISO GML MultiCurve
#' @return Object of \code{\link{R6Class}} for modelling an GML multicurve
#' @format \code{\link{R6Class}} object.
#'
#' @note Experimental
#'
#' @references
#' ISO 19136:2007 Geographic Information -- Geographic Markup Language.
#' http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=32554
#'
#' OGC Geography Markup Language. http://www.opengeospatial.org/standards/gml
#'
#' @author Emmanuel Blondel <emmanuel.blondel1@@gmail.com>
#'
GMLMultiCurve <- R6Class("GMLMultiCurve",
inherit = GMLAbstractGeometricAggregate,
private = list(
xmlElement = "MultiCurve",
xmlNamespacePrefix = "GML"
),
public = list(
#'@field attrs gml attributes
attrs = list("gml:id" = NA),
#'@field curveMember curve members
curveMember = list(),
#'@description Initializes object
#'@param xml object of class \link{XMLInternalNode-class}
#'@param sfg simple feature geometry resulting from \pkg{sf}
initialize = function(xml = NULL, sfg = NULL){
super$initialize(xml, element = private$xmlElement, wrap = TRUE)
if(is.null(xml)){
if(!is.null(sfg)){
if(!all(sapply(c("sfg","XY", "MULTILINESTRING"), function(x){is(sfg, x)}))) stop("Input 'sfg' object should be a 'multilinestring'")
coords.list <- sfg
class(coords.list) <- "list"
for(coords in coords.list){
linestring <- st_linestring(coords)
self$addCurveMember(GMLLineString$new(sfg=linestring))
}
}
}
},
#'@description Adds curve member
#'@param curve curve object of class inheriting \link{GMLAbstractCurve}
#'@return \code{TRUE} if added, \code{FALSE} otherwise
addCurveMember = function(curve){
if(!inherits(curve, "GMLAbstractCurve")){
stop("Input 'curve' should be an object that inherits 'GMLAbstractCurve'")
}
added = self$addListElement("curveMember", curve)
if(added){
self$attrs <- curve$attrs[names(curve$attrs)!="gml:id"]
}
return(added)
},
#'@description Deletes curve member
#'@param curve curve object of class inheriting \link{GMLAbstractCurve}
#'@return \code{TRUE} if deleted, \code{FALSE} otherwise
delCurveMember = function(curve){
if(!inherits(curve, "GMLAbstractCurve")){
stop("Input 'curve' should be an object that inherits 'GMLAbstractCurve'")
}
deleted = self$delListElement("curveMember", curve)
if(deleted){
if(length(self$curveMember)==0) self$attrs[["srsDimension"]] <- NULL
}
return(deleted)
}
)
)
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