saffron.rel.plan
Class NestedLoopJoinPlan.NestedLoopJoinIterator

java.lang.Object
  |
  +--saffron.rel.plan.NestedLoopJoinPlan.NestedLoopJoinIterator

All Implemented Interfaces:

Iterator

Enclosing class:

NestedLoopJoinPlan

private class NestedLoopJoinPlan.NestedLoopJoinIterator

extends Object

implements Iterator

Field Summary

(package private) boolean	done
(package private) boolean	haveMovedToNext
(package private) Field[]	leftFields If the left input is a synthetic class, then leftFields are the n fields within the row to put leftSourceFields, the n fields of the row from the left input.
(package private) Field[]	leftSourceFields If the left input is a synthetic class, then leftFields are the n fields within the row to put leftSourceFields, the n fields of the row from the left input.
(package private) Field[]	rightFields If the left input is a synthetic class, then leftFields are the n fields within the row to put leftSourceFields, the n fields of the row from the left input.
(package private) Field[]	rightSourceFields If the left input is a synthetic class, then leftFields are the n fields within the row to put leftSourceFields, the n fields of the row from the left input.
(package private) Object	row

Constructor Summary

(package private)

NestedLoopJoinPlan.NestedLoopJoinIterator()

Method Summary

private Object	createRow()
boolean	hasNext() We cannot call moveToNext() from next(), because it calls next() on the underlying iterators, and might therefore invalidate the objects it is about to return.
private void	moveToNext()
private void	moveToNextIfNecessary()
Object	next() This method does not call moveToNext(), as would be typical.
void	remove()

Methods inherited from class java.lang.Object

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

Field Detail

haveMovedToNext

boolean haveMovedToNext

done

boolean done

leftFields

Field[] leftFields

If the left input is a synthetic class, then leftFields are the n fields within the row to put leftSourceFields, the n fields of the row from the left input. If the left input is a real class, then leftFields has only one member, and leftSourceFields is null.

rightFields

Field[] rightFields

If the left input is a synthetic class, then leftFields are the n fields within the row to put leftSourceFields, the n fields of the row from the left input. If the left input is a real class, then leftFields has only one member, and leftSourceFields is null.

leftSourceFields

Field[] leftSourceFields

If the left input is a synthetic class, then leftFields are the n fields within the row to put leftSourceFields, the n fields of the row from the left input. If the left input is a real class, then leftFields has only one member, and leftSourceFields is null.

rightSourceFields

Field[] rightSourceFields

If the left input is a synthetic class, then leftFields are the n fields within the row to put leftSourceFields, the n fields of the row from the left input. If the left input is a real class, then leftFields has only one member, and leftSourceFields is null.

row

Object row

Constructor Detail

NestedLoopJoinPlan.NestedLoopJoinIterator

NestedLoopJoinPlan.NestedLoopJoinIterator()

Method Detail

createRow

private Object createRow()

moveToNext

private void moveToNext()

moveToNextIfNecessary

private void moveToNextIfNecessary()

hasNext

public boolean hasNext()

We cannot call moveToNext() from next(), because it calls next() on the underlying iterators, and might therefore invalidate the objects it is about to return. We therefore call moveToNext() the first time that they call hasNext(). After they have called hasNext(), the row just returned may be invalid.

Specified by:

hasNext in interface Iterator

next

public Object next()

This method does not call moveToNext(), as would be typical. See hasNext() for more details.

Specified by:

next in interface Iterator

remove

public void remove()

Specified by:

remove in interface Iterator