I have an Apache Collections HashBag with a @OneToMany relation.
I created a class "PersistentHashBagType" which implements "UserCollectionType" to try using type HashBag directly without transforming it to type List, but I have an exception because Hibernate do not detect the HashBag like Collection for use @OneToMany @ManyToMany or @CollectionOfElements.
Is that ok? How can I use the HashBag with Hibernate?
I referer the class in the entity of my HashBag with the annotation:
{ { code:java}
@OneToMany(cascade = CascadeType.ALL, orphanRemoval = true)
@org.hibernate.annotations.CollectionType(type="com.serviceapi.model.tools.PersistentHashBagType")
public HashBag<Profesor> getHashBagProfesores() {
return hashBagProfesores;
}
{code } }
And this is the implementation of PersistentHashBagType:
{ { code:java}
package com.serviceapi.model.tools;
import java.util.Iterator;
import java.util.Map;
import org.apache.commons.collections4.bag.HashBag;
import org.hibernate.HibernateException;
import org.hibernate.collection.internal.PersistentBag;
import org.hibernate.collection.spi.PersistentCollection;
import org.hibernate.engine.spi.SharedSessionContractImplementor;
import org.hibernate.persister.collection.CollectionPersister;
import org.hibernate.usertype.UserCollectionType;
public class PersistentHashBagType implements UserCollectionType {
@Override
public PersistentCollection instantiate(SharedSessionContractImplementor session, CollectionPersister persister)
throws HibernateException {
return new PersistentBag(session);
}
@Override
public PersistentCollection wrap(SharedSessionContractImplementor session, Object collection) {
return new PersistentBag(session, (HashBag<?>)collection);
}
@Override
public Iterator<?> getElementsIterator(Object collection) {
return ((HashBag<?>) collection).iterator();
}
@Override
public boolean contains(Object collection, Object entity) {
return ((HashBag<?>) collection).contains(entity);
}
@Override
public Object indexOf(Object collection, Object entity) {
throw new UnsupportedOperationException();
}
@Override
public Object replaceElements(Object original, Object target, CollectionPersister persister, Object owner,
Map copyCache, SharedSessionContractImplementor session) throws HibernateException {
((HashBag<?>) target).clear();
((HashBag) target).addAll((HashBag) original);
return target;
}
@Override
public Object instantiate(int anticipatedSize) {
return new HashBag<>();
}
}
{code } } |
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