org.axiondb.engine.rowiterators.BaseRowIterator
org.axiondb.engine.rowiterators.CollatingRowIterator
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java.lang.Object
public class CollatingRowIterator
Collates the results of two or more sorted RowIterators according to the given
RowComparator. It is assumed that each iterator is already ordered (ascending)
according to the given RowComparator.
| Constructor Summary | |
|---|---|
CollatingRowIterator(RowComparator comparator)
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| Method Summary | |
|---|---|
void |
addRowIterator(RowIterator iter)
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Row |
current()
Returns the last Rowreturned 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 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. |
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 RowIterator.next()row, if any, or the number of elements is
the iterator if we've reached the end. |
Row |
previous()
Returns the previous Rowin the list, or throws
NoSuchElementExceptionif no next Row exists. |
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 Rowin 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()
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| Methods inherited from class org.axiondb.engine.rowiterators.BaseRowIterator |
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add, first, isEmpty, next, peekNext, peekPrevious, previous |
| Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
| Constructor Detail |
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public CollatingRowIterator(RowComparator comparator)
| Method Detail |
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public void addRowIterator(RowIterator iter)
throws java.lang.IllegalStateException
java.lang.IllegalStateExceptionpublic Row current()
RowIteratorRowreturned by me (by RowIterator.next(),RowIterator.previous(),
RowIterator.first(),RowIterator.last(), etc.).
current in interface RowIteratorcurrent in class BaseRowIteratorpublic int currentIndex()
RowIteratorRowIterator.current()row, if any.
currentIndex in interface RowIteratorcurrentIndex in class BaseRowIteratorpublic 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 RowIteratorhasCurrent in class BaseRowIteratorpublic 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 RowIteratorhasNext in class BaseRowIteratorpublic 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 RowIteratorhasPrevious in class BaseRowIterator
public Row last()
throws AxionException
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 RowIteratorlast in class BaseRowIteratorAxionException - when a problem occurs accessing the Row
public Row next()
throws AxionException
RowIteratorRowin the list, or throws
NoSuchElementExceptionif no next Row exists.
next in interface RowIteratornext in class BaseRowIteratorAxionException - when a problem occurs accessing the Rowpublic int nextIndex()
RowIteratorRowIterator.next()row, if any, or the number of elements is
the iterator if we've reached the end.
nextIndex in interface RowIteratornextIndex in class BaseRowIterator
public Row previous()
throws AxionException
RowIteratorRowin the list, or throws
NoSuchElementExceptionif no next Row exists.
previous in interface RowIteratorprevious in class BaseRowIteratorAxionException - when a problem occurs accessing the Rowpublic int previousIndex()
RowIteratorRowIterator.previous()row, if any, or -1 if we're add the
beginning of the list.
previousIndex in interface RowIteratorpreviousIndex in class BaseRowIterator
public void remove()
throws AxionException
BaseRowIterator
remove in interface RowIteratorremove in class BaseRowIteratorAxionException
public void reset()
throws AxionException
RowIteratorRowIterator to its initial state (positioned just
before the first Rowin the list).
reset in interface RowIteratorreset in class BaseRowIteratorAxionException
public void set(Row row)
throws AxionException
BaseRowIterator
set in interface RowIteratorset in class BaseRowIteratorAxionExceptionpublic java.lang.String toString()
toString in class java.lang.Object
public int size()
throws AxionException
RowIterator
size in interface RowIteratorsize in class BaseRowIteratorAxionException
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