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/*
 * JPAContainer
 * Copyright (C) 2010 Oy IT Mill Ltd
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see .
 */
package com.vaadin.addon.jpacontainer.provider;

import com.vaadin.addon.jpacontainer.BatchableEntityProvider;
import com.vaadin.addon.jpacontainer.BatchableEntityProvider.BatchUpdateCallback;
import javax.persistence.EntityManager;

/**
 * A very simple implementation of {@link BatchableEntityProvider} with
 * caching support that simply
 * passes itself to the {@link BatchUpdateCallback}. No data consistency checks
 * are performed.
 *
 * @see CachingMutableLocalEntityProvider
 * @see BatchableLocalEntityProvider
 * 
 * @author Petter Holmström (IT Mill)
 * @since 1.0
 */
public class CachingBatchableLocalEntityProvider extends
		CachingMutableLocalEntityProvider implements BatchableEntityProvider {

	private static final long serialVersionUID = 9174163487778140520L;

	/**
	 * Creates a new CachingBatchableLocalEntityProvider. The entity
	 * manager must be set using
	 * {@link #setEntityManager(javax.persistence.EntityManager) }.
	 * 
	 * @param entityClass
	 *            the entity class (must not be null).
	 */
	public CachingBatchableLocalEntityProvider(Class entityClass) {
		super(entityClass);
	}

	/**
	 * Creates a new CachingBatchableLocalEntityProvider.
	 * 
	 * @param entityClass
	 *            the entity class (must not be null).
	 * @param entityManager
	 *            the entity manager to use (must not be null).
	 */
	public CachingBatchableLocalEntityProvider(Class entityClass,
			EntityManager entityManager) {
		super(entityClass, entityManager);
	}

	public void batchUpdate(final BatchUpdateCallback callback)
			throws UnsupportedOperationException {
		assert callback != null : "callback must not be null";
		setFireEntityProviderChangeEvents(false);
		try {
			runInTransaction(new Runnable() {

				public void run() {
					callback.batchUpdate(CachingBatchableLocalEntityProvider.this);
				}
			});
		} finally {
			setFireEntityProviderChangeEvents(true);
		}
		fireEntityProviderChangeEvent(new BatchUpdatePerformedEvent(this));
	}
}