@Override
protected Object retrieveEntity(PersistentEntity pe, Serializable key) {
List<Criterion> criteria = new ArrayList<Criterion>(1);
criteria.add(new IdEquals(key));
return IteratorUtil.singleOrNull(
new Neo4jQuery(session, pe, this).executeQuery(pe, new Conjunction(criteria)).iterator());
}
@Override
protected List<Object> retrieveAllEntities(PersistentEntity pe, Iterable<Serializable> keys) {
List<Criterion> criterions = new ArrayList<Criterion>(1);
criterions.add(new In("id", IteratorUtil.asCollection(keys)));
Junction junction = new Conjunction(criterions);
return new Neo4jQuery(session, pe, this).executeQuery(pe, junction);
}
@Override
protected List<Serializable> persistEntities(
PersistentEntity pe, @SuppressWarnings("rawtypes") Iterable objs) {
List<Serializable> result = new ArrayList<Serializable>();
for (Object obj : objs) {
result.add(persistEntity(pe, obj));
}
return result;
}
@Override
protected void deleteEntities(
PersistentEntity pe, @SuppressWarnings("rawtypes") Iterable objects) {
List<EntityAccess> entityAccesses = new ArrayList<EntityAccess>();
List<Object> ids = new ArrayList<Object>();
Map<PersistentEntity, Collection<Object>> cascades =
new HashMap<PersistentEntity, Collection<Object>>();
for (Object obj : objects) {
EntityAccess entityAccess = createEntityAccess(pe, obj);
if (cancelDelete(pe, entityAccess)) {
return;
}
entityAccesses.add(entityAccess);
ids.add(entityAccess.getIdentifier());
// populate cascades
for (Association association : pe.getAssociations()) {
Object property = entityAccess.getProperty(association.getName());
if (association.isOwningSide()
&& association.doesCascade(CascadeType.REMOVE)
&& (property != null)) {
PersistentEntity associatedEntity = association.getAssociatedEntity();
Collection<Object> cascadesForPersistentEntity = cascades.get(associatedEntity);
if (cascadesForPersistentEntity == null) {
cascadesForPersistentEntity = new ArrayList<Object>();
cascades.put(associatedEntity, cascadesForPersistentEntity);
}
if (association instanceof ToOne) {
cascadesForPersistentEntity.add(property);
} else {
cascadesForPersistentEntity.addAll((Collection<?>) property);
}
}
}
}
for (Map.Entry<PersistentEntity, Collection<Object>> entry : cascades.entrySet()) {
deleteEntities(entry.getKey(), entry.getValue());
}
getCypherEngine()
.execute(
String.format(
"MATCH (n:%s) WHERE n.__id__ in {ids} OPTIONAL MATCH (n)-[r]-() DELETE r,n",
((GraphPersistentEntity) pe).getLabel()),
Collections.singletonMap("ids", ids));
for (EntityAccess entityAccess : entityAccesses) {
firePostDeleteEvent(pe, entityAccess);
}
}
