Hibernate example source code file (TernaryTest.java)

This example Hibernate source code file (TernaryTest.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Hibernate tags/keywords

bob, employee, employee, iterator, melbourne, override, session, site, site, string, string, test, test, tom, util

The Hibernate TernaryTest.java source code

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2011, Red Hat Inc. or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
 * distributed under license by Red Hat Inc.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * 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 Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 */
package org.hibernate.test.ternary;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.hibernate.Hibernate;
import org.hibernate.Session;
import org.hibernate.Transaction;

import org.junit.Test;

import org.hibernate.testing.junit4.BaseCoreFunctionalTestCase;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertSame;
import static org.junit.Assert.assertTrue;

/**
 * @author Gavin King
 */
public class TernaryTest extends BaseCoreFunctionalTestCase {
	@Override
	public String[] getMappings() {
		return new String[] { "ternary/Ternary.hbm.xml" };
	}

	@Override
	public String getCacheConcurrencyStrategy() {
		return null;
	}

	@Test
	public void testTernary() {
		Session s = openSession();
		Transaction t = s.beginTransaction();
		Employee bob = new Employee("Bob");
		Employee tom = new Employee("Tom");
		Employee jim = new Employee("Jim");
		Employee tim = new Employee("Tim");
		Site melb = new Site("Melbourne");
		Site geel = new Site("Geelong");
		s.persist(bob);
		s.persist(tom);
		s.persist(jim);
		s.persist(tim);
		s.persist(melb);
		s.persist(geel);
		bob.getManagerBySite().put(melb, tom);
		bob.getManagerBySite().put(geel, jim);
		tim.getManagerBySite().put(melb, tom);
		t.commit();
		s.close();
		
		s = openSession();
		t = s.beginTransaction();
		tom = (Employee) s.get(Employee.class, "Tom");
		assertFalse( Hibernate.isInitialized(tom.getUnderlings()) );
		assertEquals( tom.getUnderlings().size(), 2 );
		bob = (Employee) s.get(Employee.class, "Bob");
		assertFalse( Hibernate.isInitialized(bob.getManagerBySite()) );
		assertTrue( tom.getUnderlings().contains(bob) );
		melb = (Site) s.get(Site.class, "Melbourne");
		assertSame( bob.getManagerBySite().get(melb), tom );
		assertTrue( melb.getEmployees().contains(bob) );
		assertTrue( melb.getManagers().contains(tom) );
		t.commit();
		s.close();		

		s = openSession();
		t = s.beginTransaction();
		List l = s.createQuery("from Employee e join e.managerBySite m where m.name='Bob'").list();
		assertEquals( l.size(), 0 );
		l = s.createQuery("from Employee e join e.managerBySite m where m.name='Tom'").list();
		assertEquals( l.size(), 2 );
		t.commit();
		s.close();

		s = openSession();
		t = s.beginTransaction();
		l = s.createQuery("from Employee e left join fetch e.managerBySite").list();
		assertEquals( l.size(), 5 );
		Set set = new HashSet(l);
		assertEquals( set.size(), 4 );
		Iterator iter = set.iterator();
		int total=0;
		while ( iter.hasNext() ) {
			Map map = ( (Employee) iter.next() ).getManagerBySite();
			assertTrue( Hibernate.isInitialized(map) );
			total += map.size();
		}
		assertTrue(total==3);

		l = s.createQuery("from Employee e left join e.managerBySite m left join m.managerBySite m2").list();

		// clean up...
		l = s.createQuery("from Employee e left join fetch e.managerBySite").list();
		Iterator itr = l.iterator();
		while ( itr.hasNext() ) {
			Employee emp = ( Employee ) itr.next();
			emp.setManagerBySite( new HashMap() );
			s.delete( emp );
		}
		for ( Object entity : s.createQuery( "from Site" ).list() ) {
			s.delete( entity );
		}
		t.commit();
		s.close();
	}

	@Test
	public void testIndexRelatedFunctions() {
		Session session = openSession();
		session.beginTransaction();
		session.createQuery( "from Employee e join e.managerBySite as m where index(m) is not null" )
				.list();
		session.createQuery( "from Employee e join e.managerBySite as m where minIndex(m) is not null" )
				.list();
		session.createQuery( "from Employee e join e.managerBySite as m where maxIndex(m) is not null" )
				.list();
		session.getTransaction().commit();
		session.close();
	}
}