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java.lang.Objectorg.axiondb.engine.rowiterators.BaseRowIterator
org.axiondb.engine.rowiterators.ChainedRowIterator
public class 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 |
add(Row row)
Not supported in the base implementation. |
void |
addRowIterator(RowIterator iter)
|
Row |
current()
Returns the last Row returned by me (by RowIterator.next() ,RowIterator.previous() ,
RowIterator.first() ,RowIterator.last() , etc.). |
int |
currentIndex()
Returns the index of the RowIterator.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 |
last()
Returns the last Row in the list, positioning the cursor to just after the
last Row in the list. |
Row |
next()
Returns the next Row in the list, or throws
NoSuchElementException if no next Row exists. |
int |
next(int count)
Sets the current iterator position to currentIndex() + count; this will not set the current row, peekPrevious() may be used to return the current row. |
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 |
previous()
Returns the previous Row in the list, or throws
NoSuchElementException if no next Row exists. |
int |
previous(int count)
Sets the current iterator position to currentIndex() - count; this will not set the current row, peekNext() may be used to return the current row. |
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. |
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. |
int |
size()
Retunrs the current size of the underlaying row collection |
java.lang.String |
toString()
|
Methods inherited from class org.axiondb.engine.rowiterators.BaseRowIterator |
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first, isEmpty, peekNext, peekPrevious |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Methods inherited from interface org.axiondb.RowIterator |
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first, isEmpty, peekNext, peekPrevious |
Constructor Detail |
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public ChainedRowIterator()
Method Detail |
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public void add(Row row) throws AxionException
BaseRowIterator
add
in interface RowIterator
add
in class BaseRowIterator
AxionException
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 int currentIndex()
RowIterator
RowIterator.current()
row, if any.
currentIndex
in interface RowIterator
currentIndex
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 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 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
last
in class BaseRowIterator
AxionException
- when a problem occurs accessing the Row
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
- when a problem occurs accessing the Row
public int next(int count) throws AxionException
RowIterator
next
in interface RowIterator
next
in class BaseRowIterator
AxionException
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 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
- when a problem occurs accessing the Row
public int previous(int count) throws AxionException
RowIterator
previous
in interface RowIterator
previous
in class BaseRowIterator
AxionException
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
BaseRowIterator
remove
in interface RowIterator
remove
in class BaseRowIterator
AxionException
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 void set(Row row) throws AxionException
BaseRowIterator
set
in interface RowIterator
set
in class BaseRowIterator
AxionException
public int size() throws AxionException
RowIterator
size
in interface RowIterator
size
in class BaseRowIterator
AxionException
public java.lang.String toString()
toString
in class java.lang.Object
|
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