How to use

hasSubclasses

method

in

javax.jdo.Extent

@SuppressWarnings("rawtypes")
public QueryImpl(PersistenceManagerImpl pm, Extent ext, String filter) {
  this(pm);
  this.ext = ext;
  setClass( this.ext.getCandidateClass() );
  this.filter = filter;
  this.subClasses = ext.hasSubclasses();
}

/**
 * Set the candidate Extent to query.
 *
 * @param pcs the Candidate Extent.
 * @see javax.jdo.Query#setCandidates(javax.jdo.Extent)
 */
public void setCandidates(Extent pcs)
{
  discardCompiled();
  assertIsModifiable();
  if (pcs == null)
  {
    JPOXLogger.JDO_QUERY.warn(LOCALISER.msg("Candidates.ExtentCantBeNull"));
    return;
  }
  if (!(pcs instanceof Queryable))
  {
    throw new JDOUnsupportedOptionException(LOCALISER.msg("JDOQL.ExtentNotQueryableError",pcs.getClass().getName()));
  }
  setSubclasses(pcs.hasSubclasses());
  setClass(pcs.getCandidateClass());
  candidateExtent = pcs;
  candidateCollection = null; // We have an Extent, so remove any collection
}

assertEquals(pm, ext.getPersistenceManager());
assertEquals(TestClass.class, ext.getCandidateClass());
assertTrue(ext.hasSubclasses());
assertFalse(ext.hasSubclasses());
ext = pm.getExtent(TestClass.class);
assertFalse( ext.iterator().hasNext() );
assertTrue(ext.hasSubclasses());