org.axiondb.engine.rowiterators

Class TransformingRowIterator

java.lang.Object

org.axiondb.engine.rowiterators.DelegatingRowIterator

org.axiondb.engine.rowiterators.TransformingRowIterator

All Implemented Interfaces:

RowIterator

public abstract class TransformingRowIterator
extends DelegatingRowIterator

A DelegatingRowIteratorthat transformseach returned Row.

Version:

$Revision: 1.6 $ $Date: 2005/04/22 02:28:53 $

Constructor Summary

Constructors

Constructor and Description
TransformingRowIterator(RowIterator iter)

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.).
Row	first() Returns the first Rowin the list, positioning the cursor to just before the first Rowin the list.
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.
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.
protected abstract Row	transform(Row row)

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

add, currentIndex, getDelegate, hasCurrent, hasNext, hasPrevious, isEmpty, next, nextIndex, previous, previousIndex, remove, reset, set, setDelegate, size

Methods inherited from class java.lang.Object

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

Constructor Detail

TransformingRowIterator

public TransformingRowIterator(RowIterator iter)

Method Detail

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

Overrides:

current in class DelegatingRowIterator

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 DelegatingRowIterator

Throws:

AxionException - when a problem occurs accessing the Row

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 DelegatingRowIterator

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

Overrides:

next in class DelegatingRowIterator

Throws:

AxionException - when a problem occurs accessing the Row

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 DelegatingRowIterator

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 DelegatingRowIterator

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

Overrides:

previous in class DelegatingRowIterator

Throws:

AxionException - when a problem occurs accessing the Row

transform

protected abstract Row transform(Row row)