com.javaetmoi.core.persistence.hibernate

Class LazyLoadingUtil

java.lang.Object

com.javaetmoi.core.persistence.hibernate.LazyLoadingUtil

public class LazyLoadingUtil
extends Object

Set of helper methods that fetch a complete entity graph.

Provides a lazy way to resolve all Hibernate proxies.

Author:

Antoine Rey

Method Summary

Modifier and Type	Method and Description
protected static Object	callCollectionGetter(Object entity, String propertyName) Calls the getter of a collection property in order to resolve the javassist lazy proxy object.
static <E> Collection<E>	deepHydrate(org.hibernate.Session currentSession, Collection<E> entities) Populate a lazy-initialized object graph by recursivity.
static <E> E	deepHydrate(org.hibernate.Session currentSession, E entity) Populate a lazy-initialized object graph by recursivity.
protected static String	getterFromCollection(String propertyName) Generate the getter name of a collection property.

Methods inherited from class java.lang.Object

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

Method Detail

deepHydrate

public static <E> Collection<E> deepHydrate(org.hibernate.Session currentSession,
                                            Collection<E> entities)

Populate a lazy-initialized object graph by recursivity.

This method deeply navigates into a graph of entities in order to resolve uninitialized Hibernate proxies.
The goal is to avoid any LazyInitializationException once entities are detached from the Hibernate session.
May attention: this method has to be called from an open persistent context / Hibernate session.

Parameters:

currentSession - Hibernate session still open

entities - a Collection of Hibernate entities to load

Returns:

the Collection of Hibernate entities fully loaded. Similar to the entities input parameter. Useful when calling this method in a return statement.

deepHydrate

public static <E> E deepHydrate(org.hibernate.Session currentSession,
                                E entity)

Populate a lazy-initialized object graph by recursivity.

This method deeply navigates into a graph of entities in order to resolve uninitialized Hibernate proxies.
The goal is to avoid any LazyInitializationException once entities are detached from the Hibernate session.
May attention: this method has to be called from an open persistent context / Hibernate session.

Parameters:

currentSession - Hibernate session still open

entity - a single Hibernate entity or a simple java class referencing entities

Returns:

the Hibernate entity fully loaded. Similar to the entity input parameter. Usefull when calling this method in a return statement.

callCollectionGetter

protected static Object callCollectionGetter(Object entity,
                                             String propertyName)

Calls the getter of a collection property in order to resolve the javassist lazy proxy object.

Parameters:

entity - target object

propertyName - name of the collection property (ie. clients)

Returns:

the collection

getterFromCollection

protected static String getterFromCollection(String propertyName)

Generate the getter name of a collection property.

Parameters:

propertyName - name of the collection property (ie. clients)

Returns:

name of the corresponding getter (ie. getClients)