org.apache.ojb.broker.accesslayer
Class CollectionPrefetcher

java.lang.Object
  org.apache.ojb.broker.accesslayer.BasePrefetcher
      org.apache.ojb.broker.accesslayer.RelationshipPrefetcherImpl
          org.apache.ojb.broker.accesslayer.CollectionPrefetcher

All Implemented Interfaces:

RelationshipPrefetcher

Direct Known Subclasses:

MtoNCollectionPrefetcher

public class CollectionPrefetcher
extends RelationshipPrefetcherImpl

Relationship Prefetcher for Collections.

Version:

$Id: CollectionPrefetcher.java,v 1.1 2007-08-24 22:17:30 ewestfal Exp $

Author:

Jakob Braeuchi

Field Summary

Fields inherited from class org.apache.ojb.broker.accesslayer.BasePrefetcher

IN_LIMIT, itemClassDesc, pkLimit

Constructor Summary

CollectionPrefetcher(PersistenceBrokerImpl aBroker, ObjectReferenceDescriptor anOrd)
Constructor for CollectionPrefetcher.

Method Summary

protected void	associateBatched(Collection owners, Collection children) associate the batched Children with their owner object loop over children
protected Query[]	buildPrefetchQueries(Collection owners, Collection children) Build the multiple queries for one relationship because of limitation of IN(...)
protected Query	buildPrefetchQuery(Collection ids) Build the query to perform a batched read get orderBy settings from CollectionDescriptor
protected ManageableCollection	createCollection(CollectionDescriptor desc, Class collectionClass) Create a collection object of the given collection type.
protected CollectionDescriptor	getCollectionDescriptor()

Methods inherited from class org.apache.ojb.broker.accesslayer.RelationshipPrefetcherImpl

getObjectReferenceDescriptor, getOwnerClassDescriptor, isCascadeRetrieve, prepareRelationshipSettings, restoreRelationshipSettings, setCascadeRetrieve, setObjectReferenceDescriptor

Methods inherited from class org.apache.ojb.broker.accesslayer.BasePrefetcher

buildPrefetchCriteria, buildPrefetchQuery, buildPrefetchQuery, getBroker, getDescriptorRepository, getItemClassDescriptor, getLimit, getLogger, prefetchRelationship

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

CollectionPrefetcher

public CollectionPrefetcher(PersistenceBrokerImpl aBroker,
                            ObjectReferenceDescriptor anOrd)

Constructor for CollectionPrefetcher.

Parameters:

aBroker -

anOrd -

Method Detail

buildPrefetchQueries

protected Query[] buildPrefetchQueries(Collection owners,
                                       Collection children)

Build the multiple queries for one relationship because of limitation of IN(...)

Specified by:

buildPrefetchQueries in class BasePrefetcher

Parameters:

owners - Collection containing all objects of the ONE side

buildPrefetchQuery

protected Query buildPrefetchQuery(Collection ids)

Build the query to perform a batched read get orderBy settings from CollectionDescriptor

Parameters:

ids - Collection containing all identities of objects of the ONE side

associateBatched

protected void associateBatched(Collection owners,
                                Collection children)

associate the batched Children with their owner object loop over children

Specified by:

associateBatched in class BasePrefetcher

createCollection

protected ManageableCollection createCollection(CollectionDescriptor desc,
                                                Class collectionClass)

Create a collection object of the given collection type. If none has been given, OJB uses RemovalAwareList, RemovalAwareSet, or RemovalAwareCollection depending on the field type.

Parameters:

desc - The collection descriptor

collectionClass - The collection class specified in the collection-descriptor

Returns:

The collection object

getCollectionDescriptor

protected CollectionDescriptor getCollectionDescriptor()