public List<AbstractNode> layerAll(int... opcodes) {
List<AbstractNode> children = findChildren(opcodes[0]);
if (children == null) return null;
if (opcodes.length == 1) return children;
for (int i = 1; i < opcodes.length; i++) {
List<AbstractNode> next = new ArrayList<>();
for (AbstractNode n : children) {
List<AbstractNode> match = n.findChildren(opcodes[i]);
if (match == null) continue;
next.addAll(match);
}
if (next.isEmpty()) {
return null;
} else {
children.clear();
children.addAll(next);
}
}
return children;
}
