private PersistenceManager getManager() {
if (usesXml) {
if (!xml.exists() || !xml.isFile()) {
if (pmf != null) {
pmf.close();
pmf = null;
}
return null;
}
}
if (pmf == null) {
pmf = JDOHelper.getPersistenceManagerFactory(properties);
}
return pmf.getPersistenceManager();
}
