/**
* Create a new {@link CompositeObject} instance using an example.
*
* @param type The interface the property type shall implement.
* @param types Additional interfaces the entity type shall implement.
* @param exampleEntity The example instance.
* @return The {@link CompositeObject} instance.
*/
private CompositeObject createByExample(
Class<?> type,
Class<?>[] types,
Map<PrimitivePropertyMethodMetadata<PropertyMetadata>, Object> exampleEntity) {
TypeMetadataSet<EntityTypeMetadata<EntityMetadata>> effectiveTypes =
getEffectiveTypes(type, types);
Set<EntityDiscriminator> entityDiscriminators =
sessionContext.getMetadataProvider().getEntityDiscriminators(effectiveTypes);
DatastoreSession<
EntityId,
Entity,
EntityMetadata,
EntityDiscriminator,
RelationId,
Relation,
RelationMetadata,
RelationDiscriminator,
PropertyMetadata>
datastoreSession = sessionContext.getDatastoreSession();
Entity entity =
datastoreSession
.getDatastoreEntityManager()
.createEntity(effectiveTypes, entityDiscriminators, exampleEntity);
AbstractInstanceManager<EntityId, Entity> entityInstanceManager =
sessionContext.getEntityInstanceManager();
CompositeObject instance = entityInstanceManager.createInstance(entity);
sessionContext.getInstanceListenerService().postCreate(instance);
return instance;
}
/**
* Find entities according to the given example entity.
*
* @param type The entity type.
* @param entity The example entity.
* @param <T> The entity type.
* @return A {@link com.buschmais.xo.api.ResultIterable}.
*/
private <T> ResultIterable<T> findByExample(
Class<?> type, Map<PrimitivePropertyMethodMetadata<PropertyMetadata>, Object> entity) {
EntityTypeMetadata<EntityMetadata> entityTypeMetadata =
sessionContext.getMetadataProvider().getEntityMetadata(type);
EntityDiscriminator entityDiscriminator =
entityTypeMetadata.getDatastoreMetadata().getDiscriminator();
if (entityDiscriminator == null) {
throw new XOException(
"Type "
+ type.getName()
+ " has no discriminator (i.e. cannot be identified in datastore).");
}
ResultIterator<Entity> iterator =
sessionContext
.getDatastoreSession()
.getDatastoreEntityManager()
.findEntity(entityTypeMetadata, entityDiscriminator, entity);
ResultIterator<T> resultIterator =
new ResultIterator<T>() {
@Override
public boolean hasNext() {
return iterator.hasNext();
}
@Override
public T next() {
Entity entity = iterator.next();
AbstractInstanceManager<EntityId, Entity> entityInstanceManager =
sessionContext.getEntityInstanceManager();
return entityInstanceManager.readInstance(entity);
}
@Override
public void remove() {
throw new UnsupportedOperationException("Cannot remove instance.");
}
@Override
public void close() {
iterator.close();
}
};
XOTransaction xoTransaction = sessionContext.getXOTransaction();
final ResultIterator<T> transactionalIterator =
xoTransaction != null
? new TransactionalResultIterator<>(resultIterator, xoTransaction)
: resultIterator;
return sessionContext
.getInterceptorFactory()
.addInterceptor(
new AbstractResultIterable<T>() {
@Override
public ResultIterator<T> iterator() {
return transactionalIterator;
}
},
ResultIterable.class);
}
private TypeMetadataSet<EntityTypeMetadata<EntityMetadata>> getEffectiveTypes(
Class<?> type, Class<?>... types) {
MetadataProvider<EntityMetadata, EntityDiscriminator, RelationMetadata, RelationDiscriminator>
metadataProvider = sessionContext.getMetadataProvider();
TypeMetadataSet<EntityTypeMetadata<EntityMetadata>> effectiveTypes = new TypeMetadataSet<>();
effectiveTypes.add(metadataProvider.getEntityMetadata(type));
for (Class<?> otherType : types) {
effectiveTypes.add(metadataProvider.getEntityMetadata(otherType));
}
return effectiveTypes;
}
@Override
public <T> ResultIterable<T> find(final Class<T> type, final Object value) {
EntityTypeMetadata<EntityMetadata> entityTypeMetadata =
sessionContext.getMetadataProvider().getEntityMetadata(type);
IndexedPropertyMethodMetadata indexedProperty = entityTypeMetadata.getIndexedProperty();
Map<PrimitivePropertyMethodMetadata<PropertyMetadata>, Object> exampleEntity = new HashMap<>(1);
if (indexedProperty != null) {
exampleEntity.put(indexedProperty.getPropertyMethodMetadata(), value);
} else {
exampleEntity.put(null, value);
}
return findByExample(type, exampleEntity);
}
@Override
public <T> T getRepository(Class<T> repositoryType) {
RepositoryTypeMetadata repositoryMetadata =
sessionContext.getMetadataProvider().getRepositoryMetadata(repositoryType);
RepositoryProxyMethodService<Entity, Relation> proxyMethodService =
new RepositoryProxyMethodService<>(sessionContext);
RepositoryInvocationHandler invocationHandler =
new RepositoryInvocationHandler(proxyMethodService, this);
T instance =
sessionContext
.getProxyFactory()
.createInstance(invocationHandler, new Class<?>[0], repositoryType);
return sessionContext.getInterceptorFactory().addInterceptor(instance, repositoryType);
}
private <S, R, T> R createByExample(
S from,
Class<R> relationType,
T to,
Map<PrimitivePropertyMethodMetadata<PropertyMetadata>, Object> example) {
MetadataProvider<EntityMetadata, EntityDiscriminator, RelationMetadata, RelationDiscriminator>
metadataProvider = sessionContext.getMetadataProvider();
AbstractRelationPropertyMethodMetadata<?> fromProperty =
metadataProvider.getPropertyMetadata(from.getClass(), relationType, FROM);
AbstractRelationPropertyMethodMetadata<?> toProperty =
metadataProvider.getPropertyMetadata(to.getClass(), relationType, TO);
Entity entity = sessionContext.getEntityInstanceManager().getDatastoreType(from);
R instance =
sessionContext
.getEntityPropertyManager()
.createRelationReference(entity, fromProperty, to, toProperty, example);
sessionContext.getInstanceListenerService().postCreate(instance);
return instance;
}
@Override
public <T, M> CompositeObject migrate(
T instance,
MigrationStrategy<T, M> migrationStrategy,
Class<M> targetType,
Class<?>... targetTypes) {
AbstractInstanceManager<EntityId, Entity> entityInstanceManager =
sessionContext.getEntityInstanceManager();
Entity entity = entityInstanceManager.getDatastoreType(instance);
DatastoreSession<
EntityId,
Entity,
EntityMetadata,
EntityDiscriminator,
RelationId,
Relation,
RelationMetadata,
RelationDiscriminator,
PropertyMetadata>
datastoreSession = sessionContext.getDatastoreSession();
Set<EntityDiscriminator> entityDiscriminators =
datastoreSession.getDatastoreEntityManager().getEntityDiscriminators(entity);
MetadataProvider<EntityMetadata, EntityDiscriminator, RelationMetadata, RelationDiscriminator>
metadataProvider = sessionContext.getMetadataProvider();
TypeMetadataSet<EntityTypeMetadata<EntityMetadata>> types =
metadataProvider.getTypes(entityDiscriminators);
TypeMetadataSet<EntityTypeMetadata<EntityMetadata>> effectiveTargetTypes =
getEffectiveTypes(targetType, targetTypes);
Set<EntityDiscriminator> targetEntityDiscriminators =
metadataProvider.getEntityDiscriminators(effectiveTargetTypes);
datastoreSession
.getDatastoreEntityManager()
.migrateEntity(
entity, types, entityDiscriminators, effectiveTargetTypes, targetEntityDiscriminators);
entityInstanceManager.removeInstance(instance);
CompositeObject migratedInstance = entityInstanceManager.updateInstance(entity);
if (migrationStrategy != null) {
migrationStrategy.migrate(instance, migratedInstance.as(targetType));
}
entityInstanceManager.closeInstance(instance);
return migratedInstance;
}