请各位牛人给我说说下面这种写法是啥模式啊？搞不懂

Question

public interface TransactionFactory {

/**
 * Callback mechanism; a context is always a {@link org.hibernate.Session}
 * in the Hibernate usage.
 */
public static interface Context {
    public SessionFactoryImplementor getFactory();
    public boolean isClosed();

    public boolean isFlushModeNever();
    public boolean isFlushBeforeCompletionEnabled();
    public void managedFlush();

    public boolean shouldAutoClose();
    public void managedClose();
}

/**
 * Begin a transaction and return the associated <tt>Transaction</tt> instance.
 *
 * @param jdbcContext  The jdbc context to which the transaction belongs
 * @param context The contract regarding the context in which this transaction will operate.
 * @return Transaction
 * @throws HibernateException Indicates a problem generating a transaction instance
 */
public Transaction createTransaction(JDBCContext jdbcContext, Context context) throws HibernateException;

..........
接口里弄个接口，这样做是啥目的呢？？外国人写代码就不一样

Answer 1

这样的做法是很明确的，当你想表示这里的Context是用在TransactionFactory的，一般的写法是怎样呢？可能去到把Context放在某个package下。而这里的写法，任谁都看得出，就是TransactionFactory的Context，外部想用，也就是TransactionFactory.Context就可以了