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Hibernate's core ORM functionality
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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
 * See the lgpl.txt file in the root directory or .
 */
package org.hibernate.action.internal;

import java.io.Serializable;

import org.hibernate.HibernateException;
import org.hibernate.collection.spi.PersistentCollection;
import org.hibernate.engine.spi.SharedSessionContractImplementor;
import org.hibernate.event.service.spi.EventListenerGroup;
import org.hibernate.event.spi.EventType;
import org.hibernate.event.spi.PostCollectionRecreateEvent;
import org.hibernate.event.spi.PostCollectionRecreateEventListener;
import org.hibernate.event.spi.PreCollectionRecreateEvent;
import org.hibernate.event.spi.PreCollectionRecreateEventListener;
import org.hibernate.persister.collection.CollectionPersister;

/**
 * The action for recreating a collection
 */
public final class CollectionRecreateAction extends CollectionAction {

	/**
	 * Constructs a CollectionRecreateAction
	 *
	 * @param collection The collection being recreated
	 * @param persister The collection persister
	 * @param id The collection key
	 * @param session The session
	 */
	public CollectionRecreateAction(
			final PersistentCollection collection,
			final CollectionPersister persister,
			final Serializable id,
			final SharedSessionContractImplementor session) {
		super( persister, collection, id, session );
	}

	@Override
	public void execute() throws HibernateException {
		// this method is called when a new non-null collection is persisted
		// or when an existing (non-null) collection is moved to a new owner
		final PersistentCollection collection = getCollection();
		
		preRecreate();
		getPersister().recreate( collection, getKey(), getSession() );
		getSession().getPersistenceContext().getCollectionEntry( collection ).afterAction( collection );
		evict();
		postRecreate();

		if ( getSession().getFactory().getStatistics().isStatisticsEnabled() ) {
			getSession().getFactory().getStatistics().recreateCollection( getPersister().getRole() );
		}
	}

	private void preRecreate() {
		final EventListenerGroup listenerGroup = listenerGroup( EventType.PRE_COLLECTION_RECREATE );
		if ( listenerGroup.isEmpty() ) {
			return;
		}
		final PreCollectionRecreateEvent event = new PreCollectionRecreateEvent( getPersister(), getCollection(), eventSource() );
		for ( PreCollectionRecreateEventListener listener : listenerGroup.listeners() ) {
			listener.onPreRecreateCollection( event );
		}
	}

	private void postRecreate() {
		final EventListenerGroup listenerGroup = listenerGroup( EventType.POST_COLLECTION_RECREATE );
		if ( listenerGroup.isEmpty() ) {
			return;
		}
		final PostCollectionRecreateEvent event = new PostCollectionRecreateEvent( getPersister(), getCollection(), eventSource() );
		for ( PostCollectionRecreateEventListener listener : listenerGroup.listeners() ) {
			listener.onPostRecreateCollection( event );
		}
	}
}