/**
* Writes the given {@link Map} using the given {@link MongoPersistentProperty} information.
*
* @param map must not {@literal null}.
* @param property must not be {@literal null}.
* @return
*/
protected DBObject createMap(Map<Object, Object> map, MongoPersistentProperty property) {
Assert.notNull(map, "Given map must not be null!");
Assert.notNull(property, "PersistentProperty must not be null!");
if (!property.isDbReference()) {
return writeMapInternal(map, new BasicDBObject(), property.getTypeInformation());
}
BasicDBObject dbObject = new BasicDBObject();
for (Map.Entry<Object, Object> entry : map.entrySet()) {
Object key = entry.getKey();
Object value = entry.getValue();
if (conversions.isSimpleType(key.getClass())) {
String simpleKey = prepareMapKey(key.toString());
dbObject.put(simpleKey, value != null ? createDBRef(value, property) : null);
} else {
throw new MappingException("Cannot use a complex object as a key value.");
}
}
return dbObject;
}
/*
* (non-Javadoc)
* @see org.springframework.data.convert.PropertyValueProvider#getPropertyValue(org.springframework.data.mapping.PersistentProperty)
*/
public <T> T getPropertyValue(MongoPersistentProperty property) {
String expression = property.getSpelExpression();
Object value = expression != null ? evaluator.evaluate(expression) : source.get(property);
if (value == null) {
return null;
}
return readValue(value, property.getTypeInformation(), path);
}
/**
* Writes the given {@link Collection} using the given {@link MongoPersistentProperty}
* information.
*
* @param collection must not be {@literal null}.
* @param property must not be {@literal null}.
* @return
*/
protected DBObject createCollection(Collection<?> collection, MongoPersistentProperty property) {
if (!property.isDbReference()) {
return writeCollectionInternal(collection, property.getTypeInformation(), new BasicDBList());
}
BasicDBList dbList = new BasicDBList();
for (Object element : collection) {
if (element == null) {
continue;
}
DBRef dbRef = createDBRef(element, property);
dbList.add(dbRef);
}
return dbList;
}
protected DBRef createDBRef(Object target, MongoPersistentProperty property) {
Assert.notNull(target);
if (target instanceof DBRef) {
return (DBRef) target;
}
MongoPersistentEntity<?> targetEntity = mappingContext.getPersistentEntity(target.getClass());
targetEntity =
targetEntity == null
? targetEntity = mappingContext.getPersistentEntity(property)
: targetEntity;
if (null == targetEntity) {
throw new MappingException("No mapping metadata found for " + target.getClass());
}
MongoPersistentProperty idProperty = targetEntity.getIdProperty();
if (idProperty == null) {
throw new MappingException("No id property found on class " + targetEntity.getType());
}
Object id = null;
if (target.getClass().equals(idProperty.getType())) {
id = target;
} else {
PersistentPropertyAccessor accessor = targetEntity.getPropertyAccessor(target);
id = accessor.getProperty(idProperty);
}
if (null == id) {
throw new MappingException("Cannot create a reference to an object with a NULL id.");
}
return dbRefResolver.createDbRef(
property == null ? null : property.getDBRef(), targetEntity, idMapper.convertId(id));
}
/*
* (non-Javadoc)
* @see org.springframework.data.mongodb.core.convert.MongoWriter#toDBRef(java.lang.Object, org.springframework.data.mongodb.core.mapping.MongoPersistentProperty)
*/
public DBRef toDBRef(Object object, MongoPersistentProperty referingProperty) {
org.springframework.data.mongodb.core.mapping.DBRef annotation = null;
if (referingProperty != null) {
annotation = referingProperty.getDBRef();
Assert.isTrue(annotation != null, "The referenced property has to be mapped with @DBRef!");
}
// @see DATAMONGO-913
if (object instanceof LazyLoadingProxy) {
return ((LazyLoadingProxy) object).toDBRef();
}
return createDBRef(object, referingProperty);
}
@SuppressWarnings({"unchecked"})
protected void writePropertyInternal(Object obj, DBObject dbo, MongoPersistentProperty prop) {
if (obj == null) {
return;
}
DBObjectAccessor accessor = new DBObjectAccessor(dbo);
TypeInformation<?> valueType = ClassTypeInformation.from(obj.getClass());
TypeInformation<?> type = prop.getTypeInformation();
if (valueType.isCollectionLike()) {
DBObject collectionInternal = createCollection(asCollection(obj), prop);
accessor.put(prop, collectionInternal);
return;
}
if (valueType.isMap()) {
DBObject mapDbObj = createMap((Map<Object, Object>) obj, prop);
accessor.put(prop, mapDbObj);
return;
}
if (prop.isDbReference()) {
DBRef dbRefObj = null;
/*
* If we already have a LazyLoadingProxy, we use it's cached DBRef value instead of
* unnecessarily initializing it only to convert it to a DBRef a few instructions later.
*/
if (obj instanceof LazyLoadingProxy) {
dbRefObj = ((LazyLoadingProxy) obj).toDBRef();
}
dbRefObj = dbRefObj != null ? dbRefObj : createDBRef(obj, prop);
if (null != dbRefObj) {
accessor.put(prop, dbRefObj);
return;
}
}
/*
* If we have a LazyLoadingProxy we make sure it is initialized first.
*/
if (obj instanceof LazyLoadingProxy) {
obj = ((LazyLoadingProxy) obj).getTarget();
}
// Lookup potential custom target type
Class<?> basicTargetType = conversions.getCustomWriteTarget(obj.getClass(), null);
if (basicTargetType != null) {
accessor.put(prop, conversionService.convert(obj, basicTargetType));
return;
}
Object existingValue = accessor.get(prop);
BasicDBObject propDbObj =
existingValue instanceof BasicDBObject
? (BasicDBObject) existingValue
: new BasicDBObject();
addCustomTypeKeyIfNecessary(ClassTypeInformation.from(prop.getRawType()), obj, propDbObj);
MongoPersistentEntity<?> entity =
isSubtype(prop.getType(), obj.getClass())
? mappingContext.getPersistentEntity(obj.getClass())
: mappingContext.getPersistentEntity(type);
writeInternal(obj, propDbObj, entity);
accessor.put(prop, propDbObj);
}
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;
}
