org.axiondb.engine.rowiterators

Class AbstractJoinedRowIterator

java.lang.Object

org.axiondb.engine.rowiterators.BaseRowIterator

org.axiondb.engine.rowiterators.AbstractJoinedRowIterator

All Implemented Interfaces:

RowIterator

Direct Known Subclasses:

IndexNestedLoopJoinedRowIterator, NestedLoopJoinedRowIterator

public abstract class AbstractJoinedRowIterator
extends BaseRowIterator

Version:

$Revision: 1.7 $ $Date: 2005/03/31 00:07:07 $

Constructor Summary

Constructors

Constructor and Description
AbstractJoinedRowIterator()

Method Summary

Modifier and Type	Method and Description
Row	current() Returns the last Rowreturned by me (by RowIterator.next(),RowIterator.previous(), RowIterator.first(),RowIterator.last(), etc.).
int	currentIndex() Returns the index of the RowIterator.current()row, if any.
protected abstract RowIterator	generateRightRowIterator()
protected Selectable	getJoinCondition()
protected RowIterator	getLeftRowIterator()
protected int	getRightSideColumnCount()
protected RowDecorator	getRowDecorator()
boolean	hasCurrent() Returns true if I have a current Row.
boolean	hasNext() Returns true if I have more Rows when traversing the list in the forward direction.
boolean	hasPrevious() Returns true if I have more Rows when traversing the list in the reverse direction.
protected boolean	isRightOuter()
protected boolean	isSwapLeftAndRight()
Row	next() Returns the next Rowin the list, or throws NoSuchElementExceptionif no next Row exists.
int	nextIndex() Returns the index of the RowIterator.next()row, if any, or the number of elements is the iterator if we've reached the end.
Row	previous() Returns the previous Rowin the list, or throws NoSuchElementExceptionif no next Row exists.
int	previousIndex() Returns the index of the RowIterator.previous()row, if any, or -1 if we're add the beginning of the list.
void	reset() Re-initialize this RowIterator to its initial state (positioned just before the first Rowin the list).
void	setJoinCondition(Selectable joinCondition, RowDecorator decorator)
protected void	setLeftRowIterator(RowIterator left)
protected void	setRightOuter(boolean b)
protected void	setRightSideColumnCount(int rightColumnCount)
protected void	setSwapLeftAndRight(boolean b)
java.lang.String	toString()

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

add, first, isEmpty, last, next, peekNext, peekPrevious, previous, remove, set, size

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractJoinedRowIterator

public AbstractJoinedRowIterator()

Method Detail

current

public Row current()
            throws java.util.NoSuchElementException

Description copied from interface: RowIterator

Returns the last Rowreturned by me (by RowIterator.next(),RowIterator.previous(), RowIterator.first(),RowIterator.last(), etc.).

Specified by:

current in interface RowIterator

Specified by:

current in class BaseRowIterator

Throws:

java.util.NoSuchElementException - when no Rowhas yet been returned

currentIndex

public int currentIndex()
                 throws java.util.NoSuchElementException

Description copied from interface: RowIterator

Returns the index of the RowIterator.current()row, if any.

Specified by:

currentIndex in interface RowIterator

Specified by:

currentIndex in class BaseRowIterator

Throws:

java.util.NoSuchElementException - when no Rowhas yet been returned

hasCurrent

public boolean hasCurrent()

Description copied from interface: RowIterator

Returns true if I have a current Row. (In other words, returns true iff RowIterator.current()would return a Rowrather than throwing an exception.)

Specified by:

hasCurrent in interface RowIterator

Specified by:

hasCurrent in class BaseRowIterator

hasNext

public boolean hasNext()

Description copied from interface: RowIterator

Returns true if I have more Rows when traversing the list in the forward direction. (In other words, returns true iff RowIterator.next()would return a Rowrather than throwing an exception.)

Specified by:

hasNext in interface RowIterator

Specified by:

hasNext in class BaseRowIterator

hasPrevious

public boolean hasPrevious()

Description copied from interface: RowIterator

Returns true if I have more Rows when traversing the list in the reverse direction. (In other words, returns true iff RowIterator.previous()would return a Rowrather than throwing an exception.)

Specified by:

hasPrevious in interface RowIterator

Specified by:

hasPrevious in class BaseRowIterator

next

public Row next()
         throws java.util.NoSuchElementException,
                AxionException

Description copied from interface: RowIterator

Returns the next Rowin the list, or throws NoSuchElementExceptionif no next Row exists.

Specified by:

next in interface RowIterator

Specified by:

next in class BaseRowIterator

Throws:

java.util.NoSuchElementException - when there is no next Row

AxionException - when a problem occurs accessing the Row

nextIndex

public int nextIndex()

Description copied from interface: RowIterator

Returns the index of the RowIterator.next()row, if any, or the number of elements is the iterator if we've reached the end.

Specified by:

nextIndex in interface RowIterator

Specified by:

nextIndex in class BaseRowIterator

previous

public Row previous()
             throws java.util.NoSuchElementException,
                    AxionException

Description copied from interface: RowIterator

Returns the previous Rowin the list, or throws NoSuchElementExceptionif no next Row exists.

Specified by:

previous in interface RowIterator

Specified by:

previous in class BaseRowIterator

Throws:

java.util.NoSuchElementException - when there is no next Row

AxionException - when a problem occurs accessing the Row

previousIndex

public int previousIndex()

Description copied from interface: RowIterator

Returns the index of the RowIterator.previous()row, if any, or -1 if we're add the beginning of the list.

Specified by:

previousIndex in interface RowIterator

Specified by:

previousIndex in class BaseRowIterator

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

Specified by:

reset in class BaseRowIterator

Throws:

AxionException

setJoinCondition

public void setJoinCondition(Selectable joinCondition,
                             RowDecorator decorator)

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

generateRightRowIterator

protected abstract RowIterator generateRightRowIterator()
                                                 throws AxionException

Throws:

AxionException

getJoinCondition

protected Selectable getJoinCondition()

getLeftRowIterator

protected RowIterator getLeftRowIterator()

getRightSideColumnCount

protected int getRightSideColumnCount()

getRowDecorator

protected RowDecorator getRowDecorator()

isRightOuter

protected boolean isRightOuter()

isSwapLeftAndRight

protected boolean isSwapLeftAndRight()

setLeftRowIterator

protected void setLeftRowIterator(RowIterator left)

setRightOuter

protected void setRightOuter(boolean b)

setRightSideColumnCount

protected void setRightSideColumnCount(int rightColumnCount)

setSwapLeftAndRight

protected void setSwapLeftAndRight(boolean b)