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java.lang.Objectorg.axiondb.engine.rowiterators.BaseRowIterator
org.axiondb.engine.rowiterators.ChainedRowIterator
Chains together one or more RowIterator
s to make
them look like one (similiar to a SQL UNION).
Constructor Summary | |
ChainedRowIterator()
|
Method Summary | |
void |
addRowIterator(RowIterator iter)
|
Row |
current()
Returns the last Row returned by me (by next() ,previous() ,
BaseRowIterator.first() ,BaseRowIterator.last() , etc.). |
int |
currentIndex()
Returns the index of the current() row, if any. |
boolean |
hasCurrent()
Returns true if I have a current Row . |
boolean |
hasNext()
Returns true if I have more Row s when traversing the list
in the forward direction. |
boolean |
hasPrevious()
Returns true if I have more Row s when traversing the list
in the reverse direction. |
Row |
next()
Returns the next Row in the list, or throws
NoSuchElementException if 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 |
previous()
Returns the previous Row in the list, or throws
NoSuchElementException if 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 Row at 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 Row in the list). |
void |
set(Row row)
Set the Row at the current position in my underlying collection, or throw
UnsupportedOperationException . |
String |
toString()
|
Methods inherited from class org.axiondb.engine.rowiterators.BaseRowIterator |
add, first, isEmpty, last, peekNext, peekPrevious |
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, first, isEmpty, last, peekNext, peekPrevious |
Constructor Detail |
public ChainedRowIterator()
Method Detail |
public void addRowIterator(RowIterator iter)
public Row current()
RowIterator
Row
returned by me (by RowIterator.next()
,RowIterator.previous()
,
RowIterator.first()
,RowIterator.last()
, etc.).
current
in interface RowIterator
current
in class BaseRowIterator
public 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
hasCurrent
in class BaseRowIterator
public int currentIndex()
RowIterator
RowIterator.current()
row, if any.
currentIndex
in interface RowIterator
currentIndex
in class BaseRowIterator
public void reset() throws AxionException
RowIterator
RowIterator
to its initial state (positioned just
before the first Row
in the list).
reset
in interface RowIterator
reset
in class BaseRowIterator
AxionException
public Row next() throws AxionException
RowIterator
Row
in the list, or throws
NoSuchElementException
if no next Row
exists.
next
in interface RowIterator
next
in class BaseRowIterator
AxionException
public Row previous() throws AxionException
RowIterator
Row
in the list, or throws
NoSuchElementException
if no next Row
exists.
previous
in interface RowIterator
previous
in class BaseRowIterator
AxionException
public 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
hasNext
in class BaseRowIterator
public 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
hasPrevious
in class BaseRowIterator
public 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
nextIndex
in class BaseRowIterator
public int previousIndex()
RowIterator
RowIterator.previous()
row, if any, or -1 if we're add the
beginning of the list.
previousIndex
in interface RowIterator
previousIndex
in class BaseRowIterator
public void remove() throws AxionException
RowIterator
Row
at the current position in my underlying collection, or throw
UnsupportedOperationException
. (Optional operation.)
remove
in interface RowIterator
remove
in class BaseRowIterator
AxionException
public void set(Row row) throws AxionException
RowIterator
Row
at the current position in my underlying collection, or throw
UnsupportedOperationException
. (Optional operation.)
set
in interface RowIterator
set
in class BaseRowIterator
AxionException
public String toString()
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