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/*
 * Copyright 2008-2012 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.springframework.data.jpa.domain.support;

import javax.persistence.PrePersist;
import javax.persistence.PreUpdate;

import org.springframework.beans.factory.ObjectFactory;
import org.springframework.beans.factory.annotation.Configurable;
import org.springframework.data.auditing.AuditingHandler;
import org.springframework.data.domain.Auditable;
import org.springframework.util.Assert;

/**
 * JPA entity listener to capture auditing information on persiting and updating entities. To get this one flying be
 * sure you configure it as entity listener in your {@code orm.xml} as follows:
 * 
 *  * <persistence-unit-metadata>
 *     <persistence-unit-defaults>
 *         <entity-listeners>
 *             <entity-listener class="org.springframework.data.jpa.domain.auditing.support.AuditingEntityListener" />
 *         </entity-listeners>
 *     </persistence-unit-defaults>
 * </persistence-unit-metadata>
 * 
 * 
 * After that it's just a matter of activating auditing in your Spring config:
 * 
 *  * @Configuration
 * @EnableJpaAuditing
 * class ApplicationConfig {
 * 
 * }
 * 
 * 
 *  * <jpa:auditing auditor-aware-ref="yourAuditorAwarebean" />
 * 
 * 
 * @author Oliver Gierke
 * @author Thomas Darimont
 */
@Configurable
public class AuditingEntityListener {

	private ObjectFactory handler;

	/**
	 * Configures the {@link AuditingHandler} to be used to set the current auditor on the domain types touched.
	 * 
	 * @param auditingHandler must not be {@literal null}.
	 */
	public void setAuditingHandler(ObjectFactory auditingHandler) {

		Assert.notNull(auditingHandler, "AuditingHandler must not be null!");
		this.handler = auditingHandler;
	}

	/**
	 * Sets modification and creation date and auditor on the target object in case it implements {@link Auditable} on
	 * persist events.
	 * 
	 * @param target
	 */
	@PrePersist
	public void touchForCreate(Object target) {
		if (handler != null) {
			handler.getObject().markCreated(target);
		}
	}

	/**
	 * Sets modification and creation date and auditor on the target object in case it implements {@link Auditable} on
	 * update events.
	 * 
	 * @param target
	 */
	@PreUpdate
	public void touchForUpdate(Object target) {
		if (handler != null) {
			handler.getObject().markModified(target);
		}
	}
}