/*
 * 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 <http://www.gnu.org/licenses/lgpl-2.1.html>.
 */
package org.hibernate.userguide.fetching;

import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.Id;
import javax.persistence.ManyToOne;

import org.hibernate.annotations.NaturalId;
import org.hibernate.dialect.H2Dialect;
import org.hibernate.jpa.test.BaseEntityManagerFunctionalTestCase;

import org.hibernate.testing.RequiresDialect;
import org.junit.Test;

import org.jboss.logging.Logger;

import static org.hibernate.testing.transaction.TransactionUtil.doInJPA;

/**
 * @author Vlad Mihalcea
 */
@RequiresDialect(H2Dialect.class)
public class DirectVsQueryFetchingTest extends BaseEntityManagerFunctionalTestCase {

	private static final Logger log = Logger.getLogger( DirectVsQueryFetchingTest.class );

	@Override
	protected Class<?>[] getAnnotatedClasses() {
		return new Class<?>[] {
			Department.class,
			Employee.class,
		};
	}

	@Test
	public void test() {
		doInJPA( this::entityManagerFactory, entityManager -> {
			Department department = new Department();
			department.id = 1L;
			entityManager.persist( department );

			Employee employee1 = new Employee();
			employee1.id = 1L;
			employee1.username = "user1";
			employee1.department = department;
			entityManager.persist( employee1 );

		} );

		doInJPA( this::entityManagerFactory, entityManager -> {
			//tag::fetching-direct-vs-query-direct-fetching-example[]
			Employee employee = entityManager.find( Employee.class, 1L );
			//end::fetching-direct-vs-query-direct-fetching-example[]
		} );

		doInJPA( this::entityManagerFactory, entityManager -> {
			//tag::fetching-direct-vs-query-entity-query-example[]
			Employee employee = entityManager.createQuery(
					"select e " +
					"from Employee e " +
					"where e.id = :id", Employee.class)
			.setParameter( "id", 1L )
			.getSingleResult();
			//end::fetching-direct-vs-query-entity-query-example[]
		} );
	}

	//tag::fetching-direct-vs-query-domain-model-example[]
	@Entity(name = "Department")
	public static class Department {

		@Id
		private Long id;

		//Getters and setters omitted for brevity
	}

	//tag::fetching-direct-vs-query-domain-model-example[]
	@Entity(name = "Employee")
	public static class Employee {

		@Id
		private Long id;

		@NaturalId
		private String username;

		@ManyToOne(fetch = FetchType.EAGER)
		private Department department;

		//Getters and setters omitted for brevity
	}
	//end::fetching-direct-vs-query-domain-model-example[]
}