private <S extends Object> S read(
final MongoPersistentEntity<S> entity, final DBObject dbo, final ObjectPath path) {
final DefaultSpELExpressionEvaluator evaluator =
new DefaultSpELExpressionEvaluator(dbo, spELContext);
ParameterValueProvider<MongoPersistentProperty> provider =
getParameterProvider(entity, dbo, evaluator, path);
EntityInstantiator instantiator = instantiators.getInstantiatorFor(entity);
S instance = instantiator.createInstance(entity, provider);
final PersistentPropertyAccessor accessor =
new ConvertingPropertyAccessor(entity.getPropertyAccessor(instance), conversionService);
final MongoPersistentProperty idProperty = entity.getIdProperty();
final S result = instance;
// make sure id property is set before all other properties
Object idValue = null;
if (idProperty != null) {
idValue = getValueInternal(idProperty, dbo, evaluator, path);
accessor.setProperty(idProperty, idValue);
}
final ObjectPath currentPath =
path.push(result, entity, idValue != null ? dbo.get(idProperty.getFieldName()) : null);
// Set properties not already set in the constructor
entity.doWithProperties(
new PropertyHandler<MongoPersistentProperty>() {
public void doWithPersistentProperty(MongoPersistentProperty prop) {
// we skip the id property since it was already set
if (idProperty != null && idProperty.equals(prop)) {
return;
}
if (!dbo.containsField(prop.getFieldName()) || entity.isConstructorArgument(prop)) {
return;
}
accessor.setProperty(prop, getValueInternal(prop, dbo, evaluator, currentPath));
}
});
// Handle associations
entity.doWithAssociations(
new AssociationHandler<MongoPersistentProperty>() {
public void doWithAssociation(Association<MongoPersistentProperty> association) {
final MongoPersistentProperty property = association.getInverse();
Object value = dbo.get(property.getFieldName());
if (value == null || entity.isConstructorArgument(property)) {
return;
}
DBRef dbref = value instanceof DBRef ? (DBRef) value : null;
DbRefProxyHandler handler =
new DefaultDbRefProxyHandler(
spELContext, mappingContext, MappingMongoConverter.this);
DbRefResolverCallback callback =
new DefaultDbRefResolverCallback(
dbo, currentPath, evaluator, MappingMongoConverter.this);
accessor.setProperty(
property, dbRefResolver.resolveDbRef(property, dbref, callback, handler));
}
});
return result;
}
