org.axiondb.engine.rowiterators
Class NestedLoopJoinedRowIterator

java.lang.Object
  org.axiondb.engine.rowiterators.BaseRowIterator
      org.axiondb.engine.rowiterators.BaseJoinedRowIterator
          org.axiondb.engine.rowiterators.NestedLoopJoinedRowIterator

All Implemented Interfaces:

JoinedRowIterator, RowIterator

public class NestedLoopJoinedRowIterator

extends BaseJoinedRowIterator

A RowIteratorthat iterates over zero or more RowIterators, returning Rows that are the cross product of the Row s returned by the contained iterators. This class implements the nested loop join algorithm and can produce inner join, left outer join, and right outer join of the contained iterators.

Version:

$Revision: 1.3 $ $Date: 2004/08/21 10:30:43 $

Field Summary

protected boolean

_acceptableStatus

Constructor Summary

NestedLoopJoinedRowIterator()

NestedLoopJoinedRowIterator(int joinType)

NestedLoopJoinedRowIterator(int joinType, int rightColumnCount)

Method Summary

void	addRowIterator(RowIterator iterator)
int	getInnerTableColumnCount()
protected String	getShortName()
void	reset() Re-initialize this RowIterator to its initial state (positioned just before the first Rowin the list).
void	set(int rowIndex, Row row)
void	setInnerTableColumnCount(int innerTableColumnCount) Sets the _innerTableColumnCount.
protected boolean	setNextRow()
protected boolean	setPreviousRow()

Methods inherited from class org.axiondb.engine.rowiterators.BaseJoinedRowIterator

acceptable, addIterator, allIteratorsAreEmpty, anyIteratorIsEmpty, clearNextRow, clearPreviousRow, current, currentIndex, first, getIterator, getIteratorCount, hasCurrent, hasNext, hasPrevious, isLeftJoin, isNextRowSet, isPreviousRowSet, isRightJoin, last, next, nextIndex, previous, previousIndex, set, setJoinCondition, setJoinType, setNextRow, setPreviousRow, toString

Methods inherited from class org.axiondb.engine.rowiterators.BaseRowIterator

add, isEmpty, peekNext, peekPrevious, remove

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.axiondb.RowIterator

add, isEmpty, peekNext, peekPrevious, remove

Field Detail

_acceptableStatus

protected boolean _acceptableStatus

Constructor Detail

NestedLoopJoinedRowIterator

public NestedLoopJoinedRowIterator()

NestedLoopJoinedRowIterator

public NestedLoopJoinedRowIterator(int joinType)

NestedLoopJoinedRowIterator

public NestedLoopJoinedRowIterator(int joinType,
                                   int rightColumnCount)

Method Detail

addRowIterator

public void addRowIterator(RowIterator iterator)
                    throws AxionException

Throws:

AxionException

setNextRow

protected boolean setNextRow()
                      throws AxionException

Specified by:

setNextRow in class BaseJoinedRowIterator

Throws:

AxionException

setPreviousRow

protected boolean setPreviousRow()
                          throws AxionException

Specified by:

setPreviousRow in class BaseJoinedRowIterator

Throws:

AxionException

getShortName

protected String getShortName()

Specified by:

getShortName in class BaseJoinedRowIterator

reset

public void reset()
           throws AxionException

Description copied from interface: RowIterator

Re-initialize this RowIterator to its initial state (positioned just before the first Rowin the list).

Specified by:

reset in interface RowIterator

Overrides:

reset in class BaseJoinedRowIterator

Throws:

AxionException

set

public void set(int rowIndex,
                Row row)
         throws AxionException

Specified by:

set in class BaseJoinedRowIterator

Throws:

AxionException

getInnerTableColumnCount

public int getInnerTableColumnCount()

setInnerTableColumnCount

public void setInnerTableColumnCount(int innerTableColumnCount)

Sets the _innerTableColumnCount.