+ /**
+ * Utility class for implementing DataNodeContainer-type statements.
+ */
+ public abstract static class DefaultDataNodeContainer<A, D extends DeclaredStatement<A>> extends Default<A, D>
+ implements DataNodeContainerMixin<A, D> {
+ private final @NonNull ImmutableMap<QName, DataSchemaNode> dataChildren;
+ private final @NonNull Object substatements;
+
+ protected DefaultDataNodeContainer(final D declared, final StatementSourceReference ref,
+ final ImmutableList<? extends EffectiveStatement<?, ?>> substatements) {
+ super(declared);
+ this.substatements = maskList(substatements);
+
+ // Note: we do not leak this map, so iteration order does not matter
+ final Map<QName, DataSchemaNode> tmp = new HashMap<>();
+
+ for (EffectiveStatement<?, ?> stmt : effectiveSubstatements()) {
+ if (stmt instanceof DataSchemaNode) {
+ final DataSchemaNode node = (DataSchemaNode) stmt;
+ final QName id = node.getQName();
+ final DataSchemaNode prev = tmp.put(id, node);
+ SourceException.throwIf(prev != null, ref,
+ "Cannot add child with name %s, a conflicting child already exists", id);
+ }
+ }
+
+ dataChildren = ImmutableMap.copyOf(tmp);
+ }
+
+ @Override
+ public final ImmutableList<? extends EffectiveStatement<?, ?>> effectiveSubstatements() {
+ return unmaskList(substatements);
+ }
+
+ @Override
+ public final Optional<DataSchemaNode> findDataChildByName(final QName name) {
+ return Optional.ofNullable(dataChildren.get(requireNonNull(name)));
+ }
+ }
+