ca.uqac.dim.turtledb

Class NAryRelation.NAryRelationStreamIterator

java.lang.Object

ca.uqac.dim.turtledb.RelationStreamIterator

ca.uqac.dim.turtledb.NAryRelation.NAryRelationStreamIterator

All Implemented Interfaces:

RelationIterator, java.util.Iterator<Tuple>

Direct Known Subclasses:

Intersection.IntersectionIterator, Product.ProductStreamIterator, Union.UnionStreamIterator

Enclosing class:

NAryRelation

protected abstract class NAryRelation.NAryRelationStreamIterator
extends RelationStreamIterator

Field Summary

Fields

Modifier and Type	Field and Description
protected boolean	m_first Determines if the tuple to output is the first one in the iteration
protected java.util.Vector<RelationIterator>	m_iterators Iterators on each relation
protected java.util.Vector<Tuple>	m_lastTuple Vector containing the last tuple taken from each table

Fields inherited from class ca.uqac.dim.turtledb.RelationStreamIterator

m_internalNextCalled, m_nextTuple, m_outputTuples

Constructor Summary

Constructors

Constructor and Description
NAryRelationStreamIterator()

Method Summary

Modifier and Type	Method and Description
protected Tuple	incrementSmallestTuple() Returns the smallest tuple in the vector of tuples, and increments the relation that produced it
protected void	initializeIteration()
void	reset() Resets the enumeration of tuples, i.e.

Methods inherited from class ca.uqac.dim.turtledb.RelationStreamIterator

hasNext, internalNext, next, remove

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Iterator

forEachRemaining

Field Detail

m_first

protected boolean m_first

Determines if the tuple to output is the first one in the iteration

m_lastTuple

protected java.util.Vector<Tuple> m_lastTuple

Vector containing the last tuple taken from each table

m_iterators

protected java.util.Vector<RelationIterator> m_iterators

Iterators on each relation

Constructor Detail

NAryRelationStreamIterator

public NAryRelationStreamIterator()

Method Detail

initializeIteration

protected void initializeIteration()

incrementSmallestTuple

protected Tuple incrementSmallestTuple()

Returns the smallest tuple in the vector of tuples, and increments the relation that produced it

Returns:

The smallest tuple

reset

public void reset()

Description copied from class: RelationStreamIterator

Resets the enumeration of tuples, i.e. starts back at the first tuple of the relation.

Specified by:

reset in interface RelationIterator

Overrides:

reset in class RelationStreamIterator