org.axiondb.engine.rowiterators

Class DistinctRowIterator

java.lang.Object

org.axiondb.engine.rowiterators.BaseRowIterator

org.axiondb.engine.rowiterators.AbstractFilteringRowIterator

org.axiondb.engine.rowiterators.AbstractAcceptingRowIterator

org.axiondb.engine.rowiterators.DistinctRowIterator

All Implemented Interfaces:

RowIterator

public class DistinctRowIterator
extends AbstractAcceptingRowIterator

A DelegatingRowIteratorimplementing DISTINCT.

Version:

$Revision: 1.13 $ $Date: 2005/12/20 18:32:41 $

Constructor Summary

Constructors

Constructor and Description
DistinctRowIterator(RowIterator iter, java.util.Map selectableMap, Selectable[] selectables)

Method Summary

Modifier and Type	Method and Description
protected boolean	acceptable(int rowindex, Row row) My filtering method.
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.AbstractAcceptingRowIterator

determineNextRow, determinePreviousRow

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

clearNextRow, clearPreviousRow, current, currentIndex, getDelegate, hasCurrent, hasNext, hasPrevious, isNextAvailable, isPreviousAvailable, next, nextIndex, previous, previousIndex, setNext, setPrevious

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

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

Methods inherited from class java.lang.Object

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

Constructor Detail

DistinctRowIterator

public DistinctRowIterator(RowIterator iter,
                           java.util.Map selectableMap,
                           Selectable[] selectables)

Method Detail

set

public void set(Row row)
         throws AxionException

Not supported in the base implementation.

Specified by:

set in interface RowIterator

Overrides:

set in class AbstractAcceptingRowIterator

Throws:

AxionException

remove

public void remove()
            throws AxionException

Not supported in the base implementation.

Specified by:

remove in interface RowIterator

Overrides:

remove in class AbstractFilteringRowIterator

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

Overrides:

reset in class AbstractFilteringRowIterator

Throws:

AxionException

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

acceptable

protected boolean acceptable(int rowindex,
                             Row row)
                      throws AxionException

Description copied from class: AbstractAcceptingRowIterator

My filtering method. Return true if the given Rowshould be included in the iteration, false otherwise.

Specified by:

acceptable in class AbstractAcceptingRowIterator

Throws:

AxionException