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Java Source Code / Java Documentation » Database ORM » db ojb » org.apache.ojb.broker.accesslayer

Source Cross Reference Class Diagram Java Document (Java Doc)

org.apache.ojb.broker.accesslayer .OJBIterator

All known Subclasses:   org.apache.ojb.broker.accesslayer .PagingIterator,  org.apache.ojb.broker.accesslayer .RsIterator,  org.apache.ojb.broker.accesslayer .ChainingIterator,
OJBIterator
public interface OJBIterator extends Iterator(Code)
A Iterator extension internaly used by OJB to handle query results.
NOTE: OJB is very strict in handling OJBIterator instances. OJBIterator is bound very closely to the used org.apache.ojb.broker.PersistenceBroker instance. Thus if you do a
- org.apache.ojb.broker.PersistenceBroker.close
- org.apache.ojb.broker.PersistenceBroker.commitTransaction
- org.apache.ojb.broker.PersistenceBroker.abortTransaction
call, the current OJBIterator instance resources will be cleaned up automatic and invalidate current instance.

version:
   $Id: OJBIterator.java,v 1.9.2.2 2005/12/21 22:22:58 tomdz Exp $

Method Summary
boolean absolute(int row)
     Moves the cursor to the given row number in the iterator. If the row number is positive, the cursor moves to the given row number with respect to the beginning of the iterator.
public void disableLifeCycleEvents()
     Do not fire any PBLifeCycleEvent when reading next item.
int fullSize()

boolean relative(int row)
     Moves the cursor a relative number of rows, either positive or negative.
public void releaseDbResources()
     Release all internally used Database resources of the iterator. Clients must call this methods explicitely if the iterator is not exhausted by the client application.
int size()


Method Detail
absolute
boolean absolute(int row) throws PersistenceBrokerException(Code)
Moves the cursor to the given row number in the iterator. If the row number is positive, the cursor moves to the given row number with respect to the beginning of the iterator. The first row is row 1, the second is row 2, and so on.
Parameters:
  row - the row to move to in this iterator, by absolute number

disableLifeCycleEvents
public void disableLifeCycleEvents()(Code)
Do not fire any PBLifeCycleEvent when reading next item.

fullSize
int fullSize() throws PersistenceBrokerException(Code)
the unlimited size of the iterator,fullSize() may differ from size() for PagingIterator

relative
boolean relative(int row) throws PersistenceBrokerException(Code)
Moves the cursor a relative number of rows, either positive or negative. Attempting to move beyond the first/last row in the iterator positions the cursor before/after the the first/last row. Calling relative(0) is valid, but does not change the cursor position.
Parameters:
  row - the row to move to in this iterator, by relative number

releaseDbResources
public void releaseDbResources()(Code)
Release all internally used Database resources of the iterator. Clients must call this methods explicitely if the iterator is not exhausted by the client application. If the Iterator is exhauseted this method will be called implicitely.

size
int size() throws PersistenceBrokerException(Code)
the size of the iterator, aka the number of rows in this iterator.

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