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package simpledb;

import java.util.*;

/**

* DbFileIterator is the iterator interface that all SimpleDB Dbfile should

* implement.

*/

public interface DbFileIterator{

/**

* Opens the iterator

* @throws DbException when there are problems opening/accessing the database.

*/

public void open()

throws DbException, TransactionAbortedException;

/** @return true if there are more tuples available, false if no more tuples or iterator isn't open. */

public boolean hasNext()

throws DbException, TransactionAbortedException;

/**

* Gets the next tuple from the operator (typically implementing by reading

* from a child operator or an access method).

*

* @return The next tuple in the iterator.

* @throws NoSuchElementException if there are no more tuples

*/

public Tuple next()

throws DbException, TransactionAbortedException, NoSuchElementException;

/**

* Resets the iterator to the start.

* @throws DbException When rewind is unsupported.

*/

public void rewind() throws DbException, TransactionAbortedException;

/**

* Closes the iterator.

*/

public void close();

}