org.axiondb.engine.rowiterators
Class ChangingIndexedRowIterator

java.lang.Object
  org.axiondb.engine.rowiterators.DelegatingRowIterator
      org.axiondb.engine.rowiterators.ChangingIndexedRowIterator

All Implemented Interfaces:

MutableIndexedRowIterator, RowIterator

public class ChangingIndexedRowIterator

extends DelegatingRowIterator

implements MutableIndexedRowIterator

A DelegatingRowIterator that is wraps a RowIterator from some Index, and that can be reset to recreate the iterator for a new bound value.

Version:

$Revision: 1.10 $ $Date: 2004/09/09 23:47:43 $

See Also:

BaseTable.getIndexedRows(org.axiondb.Selectable, boolean), Index, BindVariable

Constructor Summary

ChangingIndexedRowIterator(Index index, Table table, Function fn)

Method Summary

String	getShortName()
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	indexSet()
boolean	isEmpty() Returns true if there are no rows to report with this iterator.
void	removeIndexKey()
void	reset() Re-initialize this RowIterator to its initial state (positioned just before the first Rowin the list).
void	setIndexKey(Object value)
String	toString()

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

add, current, currentIndex, first, getDelegate, hasCurrent, last, next, nextIndex, peekNext, peekPrevious, previous, previousIndex, remove, set, setDelegate

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, current, currentIndex, first, hasCurrent, last, next, nextIndex, peekNext, peekPrevious, previous, previousIndex, remove, set

Constructor Detail

ChangingIndexedRowIterator

public ChangingIndexedRowIterator(Index index,
                                  Table table,
                                  Function fn)
                           throws AxionException

Method Detail

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 DelegatingRowIterator

Throws:

AxionException

removeIndexKey

public void removeIndexKey()
                    throws AxionException

Specified by:

removeIndexKey in interface MutableIndexedRowIterator

Throws:

AxionException

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 DelegatingRowIterator

setIndexKey

public void setIndexKey(Object value)
                 throws AxionException

Specified by:

setIndexKey in interface MutableIndexedRowIterator

Throws:

AxionException

indexSet

public boolean indexSet()

Specified by:

indexSet in interface MutableIndexedRowIterator

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

Overrides:

hasNext in class DelegatingRowIterator

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

Overrides:

hasPrevious in class DelegatingRowIterator

toString

public String toString()

getShortName

public String getShortName()