import org.projectfloodlight.openflow.protocol.action.OFActionEnqueue; //导入依赖的package包/类
private List<OFAction> buildActions() {
    List<OFAction> acts = new LinkedList<>();
    OFAction act;
    if (treatment == null) {
        return acts;
    }
    for (Instruction i : treatment.immediate()) {
        switch (i.type()) {
        case NOACTION:
            return Collections.emptyList();
        case L2MODIFICATION:
            act = buildL2Modification(i);
            if (act != null) {
                acts.add(buildL2Modification(i));
            }
            break;
        case L3MODIFICATION:
            act = buildL3Modification(i);
            if (act != null) {
                acts.add(buildL3Modification(i));
            }
            break;
        case OUTPUT:
            OutputInstruction out = (OutputInstruction) i;
            OFActionOutput.Builder action = factory().actions().buildOutput()
                    .setPort(OFPort.of((int) out.port().toLong()));
            if (out.port().equals(PortNumber.CONTROLLER)) {
                action.setMaxLen(OFPCML_NO_BUFFER);
            }
            acts.add(action.build());
            break;
        case QUEUE:
            SetQueueInstruction queue = (SetQueueInstruction) i;
            if (queue.port() == null) {
                log.warn("Required argument 'port' undefined for OFActionEnqueue");
            }
            OFActionEnqueue.Builder queueBuilder = factory().actions().buildEnqueue()
                    .setQueueId(queue.queueId())
                    .setPort(OFPort.ofInt((int) queue.port().toLong()));
            acts.add(queueBuilder.build());
            break;
        case L0MODIFICATION:
        case L1MODIFICATION:
        case GROUP:
        case TABLE:
        case METADATA:
            log.warn("Instruction type {} not supported with protocol version {}",
                    i.type(), factory().getVersion());
            break;
        default:
            log.warn("Instruction type {} not yet implemented.", i.type());
        }
    }

    return acts;
}