ca.uqac.dim.turtledb

Class Intersection.IntersectionIterator

java.lang.Object

ca.uqac.dim.turtledb.RelationStreamIterator

ca.uqac.dim.turtledb.NAryRelation.NAryRelationStreamIterator

ca.uqac.dim.turtledb.Intersection.IntersectionIterator

All Implemented Interfaces:

RelationIterator, java.util.Iterator<Tuple>

Enclosing class:

Intersection

protected class Intersection.IntersectionIterator
extends NAryRelation.NAryRelationStreamIterator

Field Summary

Fields inherited from class ca.uqac.dim.turtledb.NAryRelation.NAryRelationStreamIterator

m_first, m_iterators, m_lastTuple

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

m_internalNextCalled, m_nextTuple, m_outputTuples

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	IntersectionIterator()

Method Summary

Modifier and Type	Method and Description
protected boolean	allEqual() Determines if the tuples currently held in the tuple vector are all equal
protected Tuple	internalNext() Implementation of internalNext.

Methods inherited from class ca.uqac.dim.turtledb.NAryRelation.NAryRelationStreamIterator

incrementSmallestTuple, initializeIteration, reset

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

hasNext, 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

Constructor Detail

IntersectionIterator

protected IntersectionIterator()

Method Detail

internalNext

protected Tuple internalNext()

Implementation of internalNext. This implementation assumes that the relations it draws its tuples from are sorted.

Specified by:

internalNext in class RelationStreamIterator

Returns:

The next tuple, null if no such tuple exists

allEqual

protected boolean allEqual()

Determines if the tuples currently held in the tuple vector are all equal

Returns:

True if the tuples are all equal and not null, false otherwise