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#' GMLMultiSurface
#'
#' @docType class
#' @importFrom R6 R6Class
#' @export
#' @keywords ISO GML MultiSurface
#' @return Object of \code{\link{R6Class}} for modelling an GML multisurface
#' @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>
#'
GMLMultiSurface <- R6Class("GMLMultiSurface",
inherit = GMLAbstractGeometricAggregate,
private = list(
xmlElement = "MultiSurface",
xmlNamespacePrefix = "GML"
),
public = list(
#'@field attrs gml attributes
attrs = list("gml:id" = NA),
#'@field surfaceMember surface members
surfaceMember = 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", "MULTIPOLYGON"), function(x){is(sfg, x)}))) stop("Input 'sfg' object should be a 'multipolygon'")
coords.list <- sfg
class(coords.list) <- "list"
for(coords in coords.list){
polygon <- st_polygon(coords)
self$addSurfaceMember(GMLPolygon$new(sfg=polygon))
}
}
}
},
#'@description Adds surface member
#'@param surface surface object of class inheriting \link{GMLAbstractSurface}
#'@return \code{TRUE} if added, \code{FALSE} otherwise
addSurfaceMember = function(surface){
if(!inherits(surface, "GMLAbstractSurface")){
stop("Input 'polygon' should be an object that inherits 'GMLAbstractSurface'")
}
added = self$addListElement("surfaceMember", surface)
if(added){
self$attrs <- surface$attrs[names(surface$attrs)!="gml:id"]
}
return(added)
},
#'@description Deletes surface member
#'@param surface surface object of class inheriting \link{GMLAbstractSurface}
#'@return \code{TRUE} if deleted, \code{FALSE} otherwise
delSurfaceMember = function(surface){
if(!inherits(surface, "GMLAbstractSurface")){
stop("Input 'polygon' should be an object that inherits 'GMLAbstractSurface'")
}
deleted = self$delListElement("surfaceMember", surface)
if(deleted){
if(length(self$surfaceMember)==0) self$attrs[["srsDimension"]] <- NULL
}
return(deleted)
}
)
)
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