@Override public int size(Query<T, C> t) { if (t instanceof HierarchicalQuery<?, ?>) { return dataProvider.size(new HierarchicalQuery<>( t.getOffset(), t.getLimit(), t.getSortOrders(), t.getInMemorySorting(), getFilter(t), ((HierarchicalQuery<T, C>) t).getParent())); } throw new IllegalArgumentException( "Hierarchical data provider doesn't support non-hierarchical queries"); }
@Override public Stream<T> fetch(Query<T, C> t) { if (t instanceof HierarchicalQuery<?, ?>) { return dataProvider.fetch(new HierarchicalQuery<>( t.getOffset(), t.getLimit(), t.getSortOrders(), t.getInMemorySorting(), getFilter(t), ((HierarchicalQuery<T, C>) t).getParent())); } throw new IllegalArgumentException( "Hierarchical data provider doesn't support non-hierarchical queries"); } };