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 1.22 2004/01/15 20:58:46 brj Exp $

Author:

Jakob Braeuchi

Field Summary

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

IN_LIMIT, itemClassDesc, pkLimit

Constructor Summary

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

Method Summary

protected void	associateBatched(java.util.Collection owners, java.util.Collection children) associate the batched Children with their owner object loop over children
protected Query[]	buildPrefetchQueries(java.util.Collection owners, java.util.Collection children) Build the multiple queries for one relationship because of limitation of IN(...)
protected Query	buildPrefetchQuery(java.util.Collection ids) Build the query to perform a batched read get orderBy settings from CollectionDescriptor
protected ManageableCollection	createCollection(java.lang.Class collectionClass) Create a Collection of class collectionClass if collectionClass is null return a RemovalAwareCollection
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(PersistenceBroker aBroker,
                            ObjectReferenceDescriptor anOrd)

Constructor for CollectionPrefetcher.

Parameters:

aBroker -

anOrd -

Method Detail

buildPrefetchQueries

protected Query[] buildPrefetchQueries(java.util.Collection owners,
                                       java.util.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(java.util.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(java.util.Collection owners,
                                java.util.Collection children)

associate the batched Children with their owner object loop over children

Specified by:

associateBatched in class BasePrefetcher

createCollection

protected ManageableCollection createCollection(java.lang.Class collectionClass)

Create a Collection of class collectionClass if collectionClass is null return a RemovalAwareCollection

Parameters:

collectionClass -

Returns:

getCollectionDescriptor

protected CollectionDescriptor getCollectionDescriptor()