EmptyRowIterator (AxionDB 1.0-M3-dev API)

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org.axiondb.engine.rowiterators
Class EmptyRowIterator

java.lang.Object
  org.axiondb.engine.rowiterators.EmptyRowIterator

All Implemented Interfaces:: RowIterator

public final class EmptyRowIterator
extends java.lang.Object
implements RowIterator
extends java.lang.Object
implements RowIterator

A RowIteratorthat contains no Rows.

Version:: $Revision: 1.11 $ $Date: 2005/04/22 02:28:53 $

Field Summary
`static RowIterator`	`INSTANCE`

Constructor Summary
`EmptyRowIterator()`

Method Summary
`void`	`add(Row row)` Add a `Row`at the current position in my underlying collection, or throw `UnsupportedOperationException`.
`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.
`Row`	`first()` Returns the first `Row`in the list, positioning the cursor to just before the first `Row`in the list.
`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.
`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.
`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`	`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.
`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()` 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`.
`int`	`size()` Retunrs the current size of the underlaying row collection
`java.lang.String`	`toString()`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Field Detail

INSTANCE

public static RowIterator INSTANCE

Constructor Detail

EmptyRowIterator

public EmptyRowIterator()

Method Detail