@Override
protected void deleteEntity(PersistentEntity pe, Object obj) {
EntityAccess entityAccess = createEntityAccess(pe, obj);
if (cancelDelete(pe, entityAccess)) {
return;
}
for (Association association : pe.getAssociations()) {
if (association.isOwningSide() && association.doesCascade(CascadeType.REMOVE)) {
log.debug("cascading delete for property " + association.getName());
GraphPersistentEntity otherPersistentEntity =
(GraphPersistentEntity) association.getAssociatedEntity();
Object otherSideValue = entityAccess.getProperty(association.getName());
if (association instanceof ToOne) {
deleteEntity(otherPersistentEntity, otherSideValue);
} else {
deleteEntities(otherPersistentEntity, (Iterable) otherSideValue);
}
}
}
getCypherEngine()
.execute(
String.format(
"MATCH (n:%s) WHERE n.__id__={id} OPTIONAL MATCH (n)-[r]-() DELETE r,n",
((GraphPersistentEntity) pe).getLabel()),
Collections.singletonMap("id", entityAccess.getIdentifier()));
firePostDeleteEvent(pe, entityAccess);
}
private Object unmarshall(PersistentEntity persistentEntity, Long id, Map<String, Object> data) {
log.debug("unmarshalling entity {}, props {}, {}", id, data);
EntityAccess entityAccess = new EntityAccess(persistentEntity, persistentEntity.newInstance());
entityAccess.setConversionService(persistentEntity.getMappingContext().getConversionService());
entityAccess.setIdentifier(id);
data.remove("__id__");
for (PersistentProperty property :
entityAccess.getPersistentEntity().getPersistentProperties()) {
String propertyName = property.getName();
if (property instanceof Simple) { // implicitly sets version property as well
entityAccess.setProperty(propertyName, data.remove(propertyName));
// } else if (property instanceof OneToOne) {
// log.error("property " + property.getName() + " is of type " +
// property.getClass().getSuperclass());
} else if (property instanceof ToOne) {
ToOne to = (ToOne) property;
CypherResult cypherResult =
getSession()
.getNativeInterface()
.execute(
CypherBuilder.findRelationshipEndpointIdsFor(to),
Collections.singletonMap("id", id));
Map<String, Object> row = IteratorUtil.singleOrNull(cypherResult);
if (row != null) {
Long endpointId = (Long) row.get("id");
entityAccess.setProperty(
propertyName,
getMappingContext()
.getProxyFactory()
.createProxy(session, to.getAssociatedEntity().getJavaClass(), endpointId));
}
} else if ((property instanceof OneToMany) || (property instanceof ManyToMany)) {
LazyEnititySet lazyEnititySet =
new LazyEnititySet(
entityAccess,
(Association) property,
getMappingContext().getProxyFactory(),
getSession());
entityAccess.setProperty(propertyName, lazyEnititySet);
} else {
throw new IllegalArgumentException(
"property $property.name is of type ${property.class.superclass}");
}
}
if (!data.isEmpty()) {
GroovyObject go = (GroovyObject) (entityAccess.getEntity());
go.setProperty(Neo4jGormEnhancer.UNDECLARED_PROPERTIES, data);
}
firePostLoadEvent(entityAccess.getPersistentEntity(), entityAccess);
return entityAccess.getEntity();
}
@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);
}
}
