Examples with ParentChildLink org.jpox.samples.linkedlist.ParentChildLink used on opensource projects

Example 1 with ParentChildLink

use of org.jpox.samples.linkedlist.ParentChildLink in project tests by datanucleus.

the class RelationshipTest method testParentChildLinkRelation.

/**
 * Test case for 1-N inverse unidirectional to itself.
 */
public void testParentChildLinkRelation() throws Exception {
    try {
        PersistenceManager pm = pmf.getPersistenceManager();
        Transaction tx = pm.currentTransaction();
        Object primaryObjId = null;
        // Check the persistence of owner and elements
        try {
            tx.begin();
            ParentChildLink secondaryObj = new ParentChildLink("secondaryObj", null);
            ParentChildLink primaryObj = new ParentChildLink("primaryObj", secondaryObj);
            ParentChildLink childA = new ParentChildLink("childA", null);
            ParentChildLink childB = new ParentChildLink("childB", null);
            pm.makePersistent(primaryObj);
            pm.makePersistent(secondaryObj);
            pm.makePersistent(childA);
            pm.makePersistent(childB);
            primaryObj.addChild(childA);
            primaryObj.addChild(childB);
            tx.commit();
            primaryObjId = pm.getObjectId(primaryObj);
        } catch (Exception e) {
            LOG.error(e);
            fail("Exception thrown while creating 1-N unidirectional relationships : " + e.getMessage());
        } finally {
            if (tx.isActive()) {
                tx.rollback();
            }
            pm.close();
        }
        // Check the retrieval of the owner and elements
        pm = pmf.getPersistenceManager();
        tx = pm.currentTransaction();
        tx = pm.currentTransaction();
        try {
            tx.begin();
            ParentChildLink toSelf = (ParentChildLink) pm.getObjectById(primaryObjId, true);
            assertNotNull("Unable to retrieve container object for unidirectional 1-N FK relationship", toSelf);
            assertEquals("Number of elements in unidirectional 1-N FK relationship is wrong : was " + toSelf.getChildren().size() + " but should have been 2", toSelf.getChildren().size(), 2);
            tx.commit();
        } catch (Exception e) {
            LOG.error(e);
            fail("Exception thrown while querying 1-N unidirectional relationships : " + e.getMessage());
        } finally {
            if (tx.isActive()) {
                tx.rollback();
            }
            pm.close();
        }
    } finally {
        PersistenceManager pm = pmf.getPersistenceManager();
        Transaction tx = pm.currentTransaction();
        try {
            tx.begin();
            Extent ex = pm.getExtent(ParentChildLink.class);
            Iterator iter = ex.iterator();
            while (iter.hasNext()) {
                ParentChildLink link = (ParentChildLink) iter.next();
                link.getChildren().clear();
                link.clearNextObject();
            }
            tx.commit();
        } finally {
            if (tx.isActive()) {
                tx.rollback();
            }
            pm.close();
        }
        clean(ParentChildLink.class);
    }
}