org.axiondb.engine.rowiterators.EmptyRowIterator
|
|||||||||||
| PREV CLASS NEXT CLASS | FRAMES NO FRAMES | ||||||||||
| SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD | ||||||||||
java.lang.Object
A RowIterator that contains no Rows.
| Field Summary | |
static RowIterator |
INSTANCE
|
| Constructor Summary | |
EmptyRowIterator()
|
|
| Method Summary | |
void |
add(Row row)
Add a Rowat the current position in my underlying collection, or throw
UnsupportedOperationException. |
Row |
current()
Returns the last Rowreturned by me (by next(),previous(),
first(),last(), etc.). |
int |
currentIndex()
Returns the index of the 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 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 next(), if any, but
don't update my position. |
Row |
peekPrevious()
Return the value that would be returned by a call to 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 previous()row, if any, or -1 if we're add the
beginning of the list. |
void |
remove()
Set the Rowat the current position in my underlying collection, or throw
UnsupportedOperationException. |
void |
reset()
Re-initialize this RowIterator to its initial state (positioned just
before the first Rowin the list). |
void |
set(Row row)
Set the Rowat the current position in my underlying collection, or throw
UnsupportedOperationException. |
| Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Field Detail |
public static RowIterator INSTANCE
| Constructor Detail |
public EmptyRowIterator()
| Method Detail |
public Row current()
RowIteratorRowreturned by me (by RowIterator.next(),RowIterator.previous(),
RowIterator.first(),RowIterator.last(), etc.).
current in interface RowIteratorpublic boolean hasCurrent()
RowIteratortrue if I have a current Row. (In other words,
returns true iff RowIterator.current()would return a Rowrather
than throwing an exception.)
hasCurrent in interface RowIteratorpublic Row first()
RowIteratorRowin 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.)
first in interface RowIteratorpublic Row last()
RowIteratorRowin 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.)
last in interface RowIteratorpublic Row next()
RowIteratorRowin the list, or throws
NoSuchElementExceptionif no next Row exists.
next in interface RowIteratorpublic Row previous()
RowIteratorRowin the list, or throws
NoSuchElementExceptionif no next Row exists.
previous in interface RowIteratorpublic boolean hasNext()
RowIteratortrue 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.)
hasNext in interface RowIteratorpublic boolean hasPrevious()
RowIteratortrue 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.)
hasPrevious in interface RowIteratorpublic boolean isEmpty()
RowIteratortrue if there are no rows to report with this iterator.
isEmpty in interface RowIteratorpublic void add(Row row)
RowIteratorRowat the current position in my underlying collection, or throw
UnsupportedOperationException. (Optional operation.)
add in interface RowIteratorpublic int nextIndex()
RowIteratorRowIterator.next()row, if any, or the number of elements is
the iterator if we've reached the end.
nextIndex in interface RowIteratorpublic int previousIndex()
RowIteratorRowIterator.previous()row, if any, or -1 if we're add the
beginning of the list.
previousIndex in interface RowIteratorpublic int currentIndex()
RowIteratorRowIterator.current()row, if any.
currentIndex in interface RowIteratorpublic void remove()
RowIteratorRowat the current position in my underlying collection, or throw
UnsupportedOperationException. (Optional operation.)
remove in interface RowIteratorpublic void set(Row row)
RowIteratorRowat the current position in my underlying collection, or throw
UnsupportedOperationException. (Optional operation.)
set in interface RowIteratorpublic Row peekNext()
RowIteratorRowIterator.next(), if any, but
don't update my position.
peekNext in interface RowIteratorpublic Row peekPrevious()
RowIteratorRowIterator.previous(), if any,
but don't update my position.
peekPrevious in interface RowIteratorpublic void reset()
RowIteratorRowIterator to its initial state (positioned just
before the first Rowin the list).
reset in interface RowIterator
|
|||||||||||
| PREV CLASS NEXT CLASS | FRAMES NO FRAMES | ||||||||||
| SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD | ||||||||||