class Downloader implements Runnable {
    volatile Status status;
    public void run() {
       // ...
       while (status.isInProgress()) { ... }
    }
}

public enum Status {
    PAUSED {
        public int someData() { return 0; }
    },
    INPROGRESS {
        public int someData() { return 1; }
    }

    public abstract int someData();

    private String msg;
    public String getSomeMsg() {
        return msg;
    }
    public void setSomeMsg(String s) {
        msg=s;
    }

    public boolean isInProgress() {
        return this == INPROGRESS;
    }
}