@Override
public void saveStakeholder(
String name, String type, String email, String website, List<Conference> conferences) {
if (conferences == null) conferences = new ArrayList<>();
Stakeholder s = new Stakeholder();
List<Key> keys = new ArrayList<>();
try {
for (Conference c : conferences) {
keys.add(c.getId());
}
s = new Stakeholder(name, type, email, website, keys);
em.persist(s);
} finally {
em.close();
}
try {
em = EMF.get().createEntityManager();
for (Key k : keys) {
Conference c = em.find(Conference.class, k);
c.addStakeholder(s.getId());
}
} finally {
em.close();
}
}
@Override
public void saveConference(
String title,
Date start,
Date end,
String room,
String website,
List<Stakeholder> stakeholders) {
if (stakeholders == null) stakeholders = new ArrayList<>();
Conference c = new Conference();
List<Key> keys = new ArrayList<>();
try {
for (Stakeholder s : stakeholders) {
keys.add(s.getId());
}
c = new Conference(title, start, end, room, website, keys);
em.persist(c);
} finally {
em.close();
}
try {
em = EMF.get().createEntityManager();
for (Key k : keys) {
Stakeholder s = em.find(Stakeholder.class, k);
s.addConference(c.getId());
}
} finally {
em.close();
}
}
@Override
public void deleteConference(long conferenceId) {
try {
Conference c = em.find(Conference.class, conferenceId);
em.getTransaction().begin();
// first remove related relation ...
for (Key Skey : c.getStakeholders()) {
Stakeholder s = em.find(Stakeholder.class, Skey.getId());
s.getConferences().remove(c.getId());
em.persist(s);
}
// then remove the entity
em.remove(c);
em.getTransaction().commit();
} catch (Exception e) {
e.printStackTrace();
} finally {
em.close();
}
}