private static Set<String> resolve(Segment segment) { assert segment != null; assert segment.isTraverse() == false; List<Set<String>> candidates = new ArrayList<>(); for (PatternElement element : segment.getElements()) { switch (element.getKind()) { case TOKEN: candidates.add(Collections.singleton(element.getToken())); break; case WILDCARD: candidates.add(Collections.singleton("*")); //$NON-NLS-1$ break; case SELECTION: candidates.add(new TreeSet<>(((Selection) element).getContents())); break; default: throw new AssertionError(); } } List<String> results = stringCrossJoin(candidates); return new TreeSet<>(results); }
break; case SELECTION: buf.append(((Selection) element).getContents().get(0)); break; default: