private static List<String> cat(
List<? extends ChangeTable<?>> cts, final String r, final boolean forceCat) {
final List<String> res = new ArrayList<String>();
for (final ConcatStep step : ConcatStep.values()) {
for (final ChangeTable<?> ct : cts) {
final String asString = ct.asString(r, step);
if (asString != null && asString.length() > 0) {
res.add(asString);
}
}
}
// don't return [""] because the caller might test the size of the result and assume that
// the DB was changed
// MySQL needs to have its "alter table add/drop fk" in separate execute()
// (multiple add would work in 5.0)
if (!forceCat && (cts.size() == 0 || cts.get(0).getSyntax().getSystem() == SQLSystem.MYSQL))
return res;
else return Collections.singletonList(CollectionUtils.join(res, "\n"));
}
