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java.lang.Objectorg.axiondb.engine.rowiterators.BaseRowIterator
public abstract class BaseRowIterator
An abstract base implementation of RowIterator
.
Constructor Summary | |
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BaseRowIterator()
|
Method Summary | |
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void |
add(Row row)
Not supported in the base implementation. |
abstract Row |
current()
Returns the last Row returned by me (by RowIterator.next() ,RowIterator.previous() ,
RowIterator.first() ,RowIterator.last() , etc.). |
abstract int |
currentIndex()
Returns the index of the RowIterator.current() row, if any. |
Row |
first()
Returns the first Row in the list, positioning the cursor to just before
the first Row in the list. |
abstract boolean |
hasCurrent()
Returns true if I have a current Row . |
abstract boolean |
hasNext()
Returns true if I have more Row s when traversing the list
in the forward direction. |
abstract boolean |
hasPrevious()
Returns true if I have more Row s 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 Row in the list, positioning the cursor to just after the
last Row in the list. |
abstract Row |
next()
Returns the next Row in the list, or throws
NoSuchElementException if no next Row exists. |
abstract 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. |
abstract Row |
previous()
Returns the previous Row in the list, or throws
NoSuchElementException if no next Row exists. |
abstract 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. |
abstract void |
reset()
Re-initialize this RowIterator to its initial state (positioned just
before the first Row in the list). |
void |
set(Row row)
Not supported in the base implementation. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public BaseRowIterator()
Method Detail |
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public abstract Row current() throws NoSuchElementException
RowIterator
Row
returned by me (by RowIterator.next()
,RowIterator.previous()
,
RowIterator.first()
,RowIterator.last()
, etc.).
current
in interface RowIterator
NoSuchElementException
- when no Row
has yet been returnedpublic abstract int currentIndex() throws NoSuchElementException
RowIterator
RowIterator.current()
row, if any.
currentIndex
in interface RowIterator
NoSuchElementException
- when no Row
has yet been returnedpublic abstract boolean hasCurrent()
RowIterator
true
if I have a current Row
. (In other words,
returns true
iff RowIterator.current()
would return a Row
rather
than throwing an exception.)
hasCurrent
in interface RowIterator
public abstract boolean hasNext()
RowIterator
true
if I have more Row
s when traversing the list
in the forward direction. (In other words, returns true
iff
RowIterator.next()
would return a Row
rather than throwing an exception.)
hasNext
in interface RowIterator
public abstract boolean hasPrevious()
RowIterator
true
if I have more Row
s when traversing the list
in the reverse direction. (In other words, returns true
iff
RowIterator.previous()
would return a Row
rather than throwing an exception.)
hasPrevious
in interface RowIterator
public abstract Row next() throws NoSuchElementException, AxionException
RowIterator
Row
in the list, or throws
NoSuchElementException
if no next Row
exists.
next
in interface RowIterator
NoSuchElementException
- when there is no next Row
AxionException
- when a problem occurs accessing the Row
public abstract int nextIndex()
RowIterator
RowIterator.next()
row, if any, or the number of elements is
the iterator if we've reached the end.
nextIndex
in interface RowIterator
public abstract Row previous() throws NoSuchElementException, AxionException
RowIterator
Row
in the list, or throws
NoSuchElementException
if no next Row
exists.
previous
in interface RowIterator
NoSuchElementException
- when there is no next Row
AxionException
- when a problem occurs accessing the Row
public abstract int previousIndex()
RowIterator
RowIterator.previous()
row, if any, or -1 if we're add the
beginning of the list.
previousIndex
in interface RowIterator
public abstract void reset() throws AxionException
RowIterator
RowIterator
to its initial state (positioned just
before the first Row
in the list).
reset
in interface RowIterator
AxionException
public boolean isEmpty()
RowIterator
true
if there are no rows to report with this iterator.
isEmpty
in interface RowIterator
public void add(Row row) throws AxionException
add
in interface RowIterator
AxionException
public void set(Row row) throws AxionException
set
in interface RowIterator
AxionException
public void remove() throws AxionException
remove
in interface RowIterator
AxionException
public Row first() throws AxionException
RowIterator
Row
in the list, positioning the cursor to just before
the first Row
in 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 RowIterator
AxionException
- when a problem occurs accessing the Row
public Row last() throws AxionException
RowIterator
Row
in the list, positioning the cursor to just after the
last Row
in 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 RowIterator
AxionException
- when a problem occurs accessing the Row
public Row peekNext() throws AxionException
RowIterator
RowIterator.next()
, if any, but
don't update my position.
peekNext
in interface RowIterator
AxionException
- when a problem occurs accessing the Row
public Row peekPrevious() throws AxionException
RowIterator
RowIterator.previous()
, if any,
but don't update my position.
peekPrevious
in interface RowIterator
AxionException
- when a problem occurs accessing the Row
|
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