org.axiondb.engine.rowiterators

Class ReverseSortedRowIterator

java.lang.Object

org.axiondb.engine.rowiterators.BaseRowIterator

org.axiondb.engine.rowiterators.ReverseSortedRowIterator

All Implemented Interfaces:

RowIterator

public class ReverseSortedRowIterator
extends BaseRowIterator

Reverse a SortedRowIterator.

Version:

$Revision: 1.1 $ $Date: 2005/03/31 00:07:06 $

Constructor Summary

Constructors

Constructor and Description
ReverseSortedRowIterator(RowIterator sortedIterator)

Method Summary

Modifier and Type	Method and Description
void	add(Row row) Not supported in the base implementation.
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.
Row	first() Returns the first Rowin the list, positioning the cursor to just before the first Rowin the list.
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.
boolean	isEmpty() Returns true if there are no rows to report with this iterator.
Row	last() Returns the last Rowin the list, positioning the cursor to just after the last Rowin the list.
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	peekNext() Return the value that would be returned by a call to RowIterator.next(), if any, but don't update my position.
Row	peekPrevious() Return the value that would be returned by a call to RowIterator.previous(), if any, but don't update my position.
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	remove() Not supported in the base implementation.
void	reset() Re-initialize this RowIterator to its initial state (positioned just before the first Rowin the list).
void	set(Row row) Not supported in the base implementation.
java.lang.String	toString()

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

next, previous, size

Methods inherited from class java.lang.Object

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

Constructor Detail

ReverseSortedRowIterator

public ReverseSortedRowIterator(RowIterator sortedIterator)
                         throws AxionException

Throws:

AxionException

Method Detail

add

public void add(Row row)
         throws AxionException

Not supported in the base implementation.

Specified by:

add in interface RowIterator

Overrides:

add in class BaseRowIterator

Throws:

AxionException

current

public Row current()

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

currentIndex

public int currentIndex()

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

first

public Row first()
          throws AxionException

Description copied from interface: RowIterator

Returns the first Rowin the list, positioning the cursor to just before the first Rowin the list. (In other words, after first is called both RowIterator.next()and RowIterator.current()will return the first row in the list.)

Specified by:

first in interface RowIterator

Overrides:

first in class BaseRowIterator

Throws:

AxionException - when a problem occurs accessing the Row

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

isEmpty

public boolean isEmpty()

Description copied from interface: RowIterator

Returns true if there are no rows to report with this iterator.

Specified by:

isEmpty in interface RowIterator

Overrides:

isEmpty in class BaseRowIterator

last

public Row last()
         throws AxionException

Description copied from interface: RowIterator

Returns the last Rowin the list, positioning the cursor to just after the last Rowin the list. (In other words, after last is called both RowIterator.previous()and RowIterator.current()will return the last row in the list.)

Specified by:

last in interface RowIterator

Overrides:

last in class BaseRowIterator

Throws:

AxionException - when a problem occurs accessing the Row

next

public Row next()
         throws 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:

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

peekNext

public Row peekNext()
             throws AxionException

Description copied from interface: RowIterator

Return the value that would be returned by a call to RowIterator.next(), if any, but don't update my position.

Specified by:

peekNext in interface RowIterator

Overrides:

peekNext in class BaseRowIterator

Throws:

AxionException - when a problem occurs accessing the Row

peekPrevious

public Row peekPrevious()
                 throws AxionException

Description copied from interface: RowIterator

Return the value that would be returned by a call to RowIterator.previous(), if any, but don't update my position.

Specified by:

peekPrevious in interface RowIterator

Overrides:

peekPrevious in class BaseRowIterator

Throws:

AxionException - when a problem occurs accessing the Row

previous

public Row previous()
             throws 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:

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

remove

public void remove()
            throws AxionException

Description copied from class: BaseRowIterator

Not supported in the base implementation.

Specified by:

remove in interface RowIterator

Overrides:

remove in class BaseRowIterator

Throws:

AxionException

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

set

public void set(Row row)
         throws AxionException

Description copied from class: BaseRowIterator

Not supported in the base implementation.

Specified by:

set in interface RowIterator

Overrides:

set in class BaseRowIterator

Throws:

AxionException

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object