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## ----------------------------------------------------------------------
##
## IGraph R package
## Copyright (C) 2014 Gabor Csardi <csardi.gabor@gmail.com>
## 334 Harvard street, Cambridge, MA 02139 USA
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; if not, write to the Free Software
## Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
## 02110-1301 USA
##
## ----------------------------------------------------------------------
#' Igraph data structure versions
#'
#' Igraph's internal data representation changes sometimes between
#' versions. This means that it is not possible to use igraph objects
#' that were created (and possibly saved to a file) with an older
#' igraph version.
#'
#' \code{graph_version} queries the current data format,
#' or the data format of a possibly older igraph graph.
#'
#' \code{\link{upgrade_graph}} can convert an older data format
#' to the current one.
#'
#' @param graph The input graph. If it is missing, then
#' the version number of the current data format is returned.
#' @return A character scalar.
#'
#' @seealso upgrade_graph to convert the data format of a graph.
#' @export
graph_version <- function(graph) {
if (missing(graph)) {
"0.8.0"
} else {
stopifnot(is_igraph(graph))
.Call("R_igraph_graph_version", graph, PACKAGE = "igraph")
}
}
#' Igraph data structure versions
#'
#' Igraph's internal data representation changes sometimes between
#' versions. This means that it is not possible to use igraph objects
#' that were created (and possibly saved to a file) with an older
#' igraph version.
#'
#' \code{\link{graph_version}} queries the current data format,
#' or the data format of a possibly older igraph graph.
#'
#' \code{upgrade_graph} can convert an older data format
#' to the current one.
#'
#' @param graph The input graph.
#' @return The graph in the current format.
#'
#' @seealso graph_version to check the current data format version
#' or the version of a graph.
#' @export
upgrade_graph <- function(graph) {
stopifnot(is_igraph(graph))
g_ver <- graph_version(graph)
p_ver <- graph_version()
if (g_ver < p_ver) {
if ((g_ver == "0.4.0" && p_ver == "0.8.0")) {
.Call("R_igraph_add_env", graph, PACKAGE = "igraph")
} else if (g_ver == "0.7.999" && p_ver == "0.8.0") {
.Call("R_igraph_add_version_to_env", graph, PACKAGE = "igraph")
} else {
stop("Don't know how to upgrade graph from ", g_ver, " to ", p_ver)
}
} else if (g_ver > p_ver) {
stop("Don't know how to downgrade graph from ", g_ver, " to ", p_ver)
} else {
graph
}
}
## Check that the version is the latest
check_version <- function(graph) {
if (graph_version() != graph_version(graph)) {
stop("This graph was created by an old(er) igraph version.\n",
" Call upgrade_graph() on it to use with the current igraph version")
}
}
warn_version <- function(graph) {
if (graph_version() != graph_version(graph)) {
message("This graph was created by an old(er) igraph version.\n",
" Call upgrade_graph() on it to use with the current igraph version\n",
" For now we convert it on the fly...")
TRUE
} else {
FALSE
}
}
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