private void handleExternals(SVNWCAccess wcAccess, File root, Map oldExternals, Map newExternals, Map depths, SVNURL fromURL, SVNURL rootURL,
SVNDepth requestedDepth, boolean isExport, boolean updateUnchanged) throws SVNException {
Set diff = new SVNHashSet();
if (oldExternals != null) {
diff.addAll(oldExternals.keySet());
}
if (newExternals != null) {
diff.addAll(newExternals.keySet());
}
// now we have diff.