org.apache.ojb.broker.accesslayer
Class BasePrefetcher

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

All Implemented Interfaces:

RelationshipPrefetcher

Direct Known Subclasses:

PlainPrefetcher, RelationshipPrefetcherImpl

public abstract class BasePrefetcher

extends java.lang.Object

implements RelationshipPrefetcher

Abstract Prefetcher.

Version:

$Id: BasePrefetcher.java,v 1.5 2004/01/15 20:58:46 brj Exp $

Author:

Oleg Nitz

Field Summary

protected static int	IN_LIMIT
protected ClassDescriptor	itemClassDesc
protected int	pkLimit

Constructor Summary

BasePrefetcher(PersistenceBroker aBroker, java.lang.Class anItemClass)
Constructor for BasePrefetcher.

Method Summary

protected abstract void	associateBatched(java.util.Collection owners, java.util.Collection children) associate the batched Children with their owner object
protected Criteria	buildPrefetchCriteria(java.util.Collection ids, FieldDescriptor[] fields)
protected abstract Query[]	buildPrefetchQueries(java.util.Collection owners, java.util.Collection children)
protected QueryByCriteria	buildPrefetchQuery(java.lang.Class clazz, java.util.Collection ids, FieldDescriptor[] fields)
protected QueryByCriteria	buildPrefetchQuery(java.util.Collection ids, FieldDescriptor[] fields)
protected PersistenceBroker	getBroker() Returns the broker.
protected DescriptorRepository	getDescriptorRepository() Return the DescriptorRepository
ClassDescriptor	getItemClassDescriptor() Returns the ClassDescriptor of the item Class
int	getLimit() The limit of objects loaded by one SQL query
protected Logger	getLogger() Returns the logger.
void	prefetchRelationship(java.util.Collection owners) Prefetch the Relationship for the owners (the 1 side of a 1:n)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.ojb.broker.accesslayer.RelationshipPrefetcher

prepareRelationshipSettings, restoreRelationshipSettings

Field Detail

itemClassDesc

protected ClassDescriptor itemClassDesc

pkLimit

protected final int pkLimit

IN_LIMIT

protected static final int IN_LIMIT

Constructor Detail

BasePrefetcher

public BasePrefetcher(PersistenceBroker aBroker,
                      java.lang.Class anItemClass)

Constructor for BasePrefetcher.

Method Detail

getLimit

public int getLimit()

The limit of objects loaded by one SQL query

Specified by:

getLimit in interface RelationshipPrefetcher

associateBatched

protected abstract void associateBatched(java.util.Collection owners,
                                         java.util.Collection children)

associate the batched Children with their owner object

prefetchRelationship

public void prefetchRelationship(java.util.Collection owners)

Description copied from interface: RelationshipPrefetcher

Prefetch the Relationship for the owners (the 1 side of a 1:n)

Specified by:

prefetchRelationship in interface RelationshipPrefetcher

See Also:

RelationshipPrefetcher.prefetchRelationship(Collection)

buildPrefetchQuery

protected QueryByCriteria buildPrefetchQuery(java.util.Collection ids,
                                             FieldDescriptor[] fields)

buildPrefetchCriteria

protected Criteria buildPrefetchCriteria(java.util.Collection ids,
                                         FieldDescriptor[] fields)

Parameters:

ids - collection of identities

fields -

Returns:

buildPrefetchQuery

protected QueryByCriteria buildPrefetchQuery(java.lang.Class clazz,
                                             java.util.Collection ids,
                                             FieldDescriptor[] fields)

Parameters:

clazz -

ids - collection of identities

fields -

Returns:

getDescriptorRepository

protected DescriptorRepository getDescriptorRepository()

Return the DescriptorRepository

getItemClassDescriptor

public ClassDescriptor getItemClassDescriptor()

Returns the ClassDescriptor of the item Class

Specified by:

getItemClassDescriptor in interface RelationshipPrefetcher

Returns:

ClassDescriptor

buildPrefetchQueries

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

getBroker

protected PersistenceBroker getBroker()

Returns the broker.

Returns:

PersistenceBroker

getLogger

protected Logger getLogger()

Returns the logger.

Returns:

Logger