openjpa-persistence-jdbc/src/test/java/org/apache/openjpa/persistence/relations/TestJoinedInheritanceHierarchy.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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
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 * KIND, either express or implied.  See the License for the
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package org.apache.openjpa.persistence.relations;

import java.util.HashSet;
import java.util.Set;

import org.apache.openjpa.persistence.OpenJPAEntityManager;
import org.apache.openjpa.persistence.test.SingleEMFTestCase;

public class TestJoinedInheritanceHierarchy
    extends SingleEMFTestCase {

    @Override
    public void setUp() {
    	super.setUp(CLEAR_TABLES, InheritanceHierarchyConcrete.class,
    			InheritanceHierarchyAbstract.class);
    }

    public void testInverseRelationNotNull() {

    	InheritanceHierarchyConcrete parent = new InheritanceHierarchyConcrete();
    	InheritanceHierarchyConcrete child = new InheritanceHierarchyConcrete();

    	parent.setValue(42);
    	child.setValue(21);

    	Set<InheritanceHierarchyAbstract> children = new HashSet<>();
    	children.add(child);
    	parent.setChildren(children);
    	child.setParent(parent);

    	OpenJPAEntityManager em = emf.createEntityManager();
    	em.getTransaction().begin();
    	em.persist(parent);
    	em.getTransaction().commit();
    	em.close();

    	em = emf.createEntityManager();
    	parent = (InheritanceHierarchyConcrete)em.createQuery(
    			"SELECT p FROM InheritanceHierarchyConcrete p WHERE p.id=" + parent.getId()
    			).getResultList().get(0);
    	em.close();

    	for(InheritanceHierarchyAbstract childNode : parent.getChildren()) {
    		assertNotNull("Parent should not be null", childNode.getParent());
    	}
    }
}