Class BoxChildHelper

src/main/java/fieldbox/boxes/BoxChildHelper.java:20–316

Class to provide more useful access to children and parent lists inside Field

/**
 * Class to provide more useful access to children and parent lists inside Field
 */
@SafeToToString
public class BoxChildHelper implements fieldlinker.AsMap, Collection<Box>, ObjectToHTML.MasqueradesAs, HandlesCompletion {

	private final ArrayList<Box> c;
	LinkedHashMap<String, Box> t = new LinkedHashMap<>();
	LinkedHashMap<String, List<Box>> tl = new LinkedHashMap<>();

	public BoxChildHelper(Collection<Box> c) {
		this.c = new ArrayList<>(c);
		c.stream().forEach(x -> t.put(x.properties.get(Box.name), x));
		c.stream().forEach(x -> tl.computeIfAbsent(x.properties.get(Box.name), (k) -> new ArrayList<>()).add(x));
	}

	@Override
	public boolean asMap_isProperty(String p) {
		return t.containsKey(p) || p.equals("all") || p.equals("first") || c.stream().map(x -> x.asMap_get(p)).filter(x -> x != null).findAny().isPresent();
	}

	@Override
	public Object asMap_call(Object a, Object b) {
		return null;
	}

	@Override
	public Object asMap_get(String p) {
		if (p.equals("all")) {
			return new All();
		}

		if (p.equals("first")) {
			if (c.size() == 0) return null;
			return c.get(0);
		}

		if (t.containsKey(p)) return t.get(p);


		Stream<Object> o = c.stream().map(x -> x.asMap_get(p)).filter(x -> x != null);
		Optional val = null;

		Dict.Prop c = new Dict.Prop(p).findCanon();
		if (c != null) {
			BinaryOperator sr = c.getAttributes().get(Dict.streamReducer);
			if (sr != null)
				val = o.reduce(sr);
			else {
				Function<Collection, Optional<Object>> cr = c.getAttributes().get(Dict.collectionReducer);
				if (cr != null) {
					List<Object> q = o.collect(Collectors.toList());
					if (q.size() > 0)
						val = cr.apply(q);
				}
			}
		}

		if (val != null && val.isPresent())
			return val.get();