simpledb

Class TupleArrayIterator

java.lang.Object

simpledb.TupleArrayIterator

All Implemented Interfaces:

java.io.Serializable, DbIterator

class TupleArrayIterator
extends java.lang.Object
implements DbIterator

Field Summary

Fields

Modifier and Type	Field and Description
(package private) java.util.Iterator<Tuple>	it
private static long	serialVersionUID
(package private) java.util.ArrayList<Tuple>	tups

Constructor Summary

Constructors

Constructor and Description
TupleArrayIterator(java.util.ArrayList<Tuple> tups)

Method Summary

Modifier and Type	Method and Description
void	close() Closes the iterator.
TupleDesc	getTupleDesc() Returns the TupleDesc associated with this DbIterator.
boolean	hasNext() Returns true if the iterator has more tuples.
Tuple	next() Gets the next tuple from the operator (typically implementing by reading from a child operator or an access method).
void	open() Opens the iterator.
void	rewind() Resets the iterator to the start.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

serialVersionUID

private static final long serialVersionUID

See Also:

Constant Field Values

tups

java.util.ArrayList<Tuple> tups

it

java.util.Iterator<Tuple> it

Constructor Detail

TupleArrayIterator

public TupleArrayIterator(java.util.ArrayList<Tuple> tups)

Method Detail

open

public void open()
          throws DbException,
                 TransactionAbortedException

Description copied from interface: DbIterator

Opens the iterator. This must be called before any of the other methods.

Specified by:

open in interface DbIterator

Throws:

DbException - when there are problems opening/accessing the database.

TransactionAbortedException

hasNext

public boolean hasNext()
                throws DbException,
                       TransactionAbortedException

Description copied from interface: DbIterator

Returns true if the iterator has more tuples.

Specified by:

hasNext in interface DbIterator

Returns:

true if the iterator has more items.

Throws:

DbException

TransactionAbortedException

next

public Tuple next()
           throws DbException,
                  TransactionAbortedException,
                  java.util.NoSuchElementException

Gets the next tuple from the operator (typically implementing by reading from a child operator or an access method).

Specified by:

next in interface DbIterator

Returns:

The next tuple in the iterator, or null if there are no more tuples.

Throws:

java.util.NoSuchElementException - if there are no more tuples.

DbException

TransactionAbortedException

rewind

public void rewind()
            throws DbException,
                   TransactionAbortedException

Resets the iterator to the start.

Specified by:

rewind in interface DbIterator

Throws:

DbException - When rewind is unsupported.

TransactionAbortedException

getTupleDesc

public TupleDesc getTupleDesc()

Returns the TupleDesc associated with this DbIterator.

Specified by:

getTupleDesc in interface DbIterator

Returns:

the TupleDesc associated with this DbIterator.

close

public void close()

Closes the iterator.

Specified by:

close in interface DbIterator