protected VectorAccessLimits intersection(VectorAccessLimits a, VectorAccessLimits b) { if (a == null) return b; if (b == null) return a; CatalogMode mode = intersection(a.getMode(), b.getMode()); List<PropertyName> readAttributes = intersection(a.getReadAttributes(), b.getReadAttributes()); Filter readFilter = intersection(a.getReadFilter(), b.getReadFilter()); List<PropertyName> writeAttributes = intersection(a.getReadAttributes(), b.getReadAttributes()); Filter writeFilter = intersection(a.getWriteFilter(), b.getWriteFilter()); return new VectorAccessLimits( mode, readAttributes, readFilter, writeAttributes, writeFilter); }