public NestedChoiceSet<ModeNests> build() {
return new NestedChoiceSet<>(
carNestBuilder.build(),
ptNestBuilder.build(),
bikeNestBuilder.build(),
walkNestBuilder.build());
}
private void add(Alternative<ModeNests> alternative, Nest.Builder<ModeNests>... sets) {
for (Nest.Builder<ModeNests> set : sets) {
if (set == null) continue;
set.addAlternative(alternative);
}
}