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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.internal.AbstractPersistentCollection;
import org.hibernate.collection.spi.PersistentCollection;
import org.hibernate.engine.spi.CollectionEntry;
import org.hibernate.engine.spi.SharedSessionContractImplementor;
import org.hibernate.persister.collection.CollectionPersister;

/**
 * If a collection is extra lazy and has queued ops, we still need to
 * process them.  Ex: OneToManyPersister needs to insert indexes for List
 * collections.  See HHH-8083.
 * 
 * @author Brett Meyer
 */
public final class QueuedOperationCollectionAction extends CollectionAction {
	
	/**
	 * Constructs a CollectionUpdateAction
	 *
	 * @param collection The collection to update
	 * @param persister The collection persister
	 * @param id The collection key
	 * @param session The session
	 */
	public QueuedOperationCollectionAction(
			final PersistentCollection collection,
			final CollectionPersister persister,
			final Serializable id,
			final SharedSessionContractImplementor session) {
		super( persister, collection, id, session );
	}

	@Override
	public void execute() throws HibernateException {
		// this QueuedOperationCollectionAction has to be executed before any other
		// CollectionAction involving the same collection.

		getPersister().processQueuedOps( getCollection(), getKey(), getSession() );

		// TODO: It would be nice if this could be done safely by CollectionPersister#processQueuedOps;
		//       Can't change the SPI to do this though.
		((AbstractPersistentCollection) getCollection() ).clearOperationQueue();

		// The other CollectionAction types call CollectionEntry#afterAction, which
		// clears the dirty flag. We don't want to call CollectionEntry#afterAction unless
		// there is no other CollectionAction that will be executed on the same collection.
		final CollectionEntry ce = getSession().getPersistenceContext().getCollectionEntry( getCollection() );
		if ( !ce.isDoremove() && !ce.isDoupdate() && !ce.isDorecreate() ) {
			ce.afterAction( getCollection() );
		}
	}
}