ca.uqac.dim.turtledb

Class VariableTable.VariableTableStreamIterator

java.lang.Object

ca.uqac.dim.turtledb.RelationStreamIterator

ca.uqac.dim.turtledb.UnaryRelation.UnaryRelationStreamIterator

ca.uqac.dim.turtledb.VariableTable.VariableTableStreamIterator

All Implemented Interfaces:

RelationIterator, java.util.Iterator<Tuple>

Enclosing class:

VariableTable

protected class VariableTable.VariableTableStreamIterator
extends UnaryRelation.UnaryRelationStreamIterator

Field Summary

Fields

Modifier and Type	Field and Description
protected RelationIterator	m_iterator
protected Tuple	m_nextTuple

Fields inherited from class ca.uqac.dim.turtledb.UnaryRelation.UnaryRelationStreamIterator

m_childIterator

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

m_internalNextCalled, m_outputTuples

Constructor Summary

Constructors

Constructor and Description
VariableTableStreamIterator()

Method Summary

Modifier and Type	Method and Description
protected Tuple	internalNext() Method that must be implemented by every non-abstract relation; it returns the next tuple of the enumeration, if any.
void	reset() Resets the enumeration of tuples, i.e.

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

Field Detail

m_iterator

protected RelationIterator m_iterator

m_nextTuple

protected Tuple m_nextTuple

Constructor Detail

VariableTableStreamIterator

public VariableTableStreamIterator()

Method Detail

internalNext

protected Tuple internalNext()

Description copied from class: RelationStreamIterator

Method that must be implemented by every non-abstract relation; it returns the next tuple of the enumeration, if any. Methods next and hasNext use the return value of internalNext and additionally remove any duplicate tuples from the output enumeration. Hence a call to next may result in multiple calls to the relation's internalNext, if the tuples returned are already part of the result (this is especially true of Projections.

Specified by:

internalNext in class RelationStreamIterator

Returns:

The next tuple, null if no such tuple exists

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 UnaryRelation.UnaryRelationStreamIterator