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package cn.keayuan.util.flow;

class Node implements INode, Runnable {
    private final String tag;
    private final IProcess process;
    private final boolean isMain;
    Node next;
    private Object params;
    private final FlowProcess flowProcess;
    private volatile boolean isCallNext;

    Node(Object arg, FlowProcess fp) {
        this.tag = null;
        process = null;
        isMain = true;
        params = arg;
        flowProcess = fp;
    }

    Node(String tag, IProcess p, boolean main, FlowProcess fp) {
        this.tag = tag;
        process = p;
        isMain = main;
        this.flowProcess = fp;
    }

    @Override
    public void run() {
        if (flowProcess.isClose) return;

        if (process != null) {
            process.process(this);
        }
    }

    @SuppressWarnings("unchecked")
    @Override
    public P getParams() {
        return (P) params;
    }

    void setParams(P p) {
        params = p;
    }

    @Override
    public String getTag() {
        return tag;
    }

    @Override
    public boolean isMain() {
        return isMain;
    }

    @Override
    public void next(String tag, Object t) {
        if (isCallNext) {
            throw new IllegalStateException("already call next()");
        }
        isCallNext = true;
        flowProcess.next(tag, t);
    }

    @Override
    public void next(T t) {
        next(null, t);
    }

    @Override
    public void next() {
        next(null);
    }

    @Override
    public void close() {
        flowProcess.close();
    }

    @Override
    public void remove(String tag) {
        flowProcess.remove(tag);
    }
}