package simpledb;
import java.util.*;

/** IndexDBIterator is the interface that index access methods
    implement in SimpleDb.
*/
public interface IndexDbIterator extends DbIterator {
    /** Open the access method such that when getNext is called, it
	iterates through the tuples that satisfy ipred.
	@param ipred The predicate that is used to scan the index.
    */	
    public void open(IndexPredicate ipred)
	throws NoSuchElementException, DbException, TransactionAbortedException;

    /** Begin a new index scan with the specified predicate.
	@param ipred The predicate that is used to scan the index.
    */	
    public void rewind(IndexPredicate ipred)
	throws DbException, TransactionAbortedException;
}