private static object DeepClone(this ISessionImplementor session, object entity, DeepCloneOptions opts, System.Type entityType,
IDictionary <object, object> resolvedEntities, DeepCloneParentEntity parentEntity = null)
{
opts = opts ?? new DeepCloneOptions();
if (entity == null || !NHibernateUtil.IsInitialized(entity))
{
return(entityType.GetDefaultValue());
}
entityType = entityType ?? entity.GetUnproxiedType(true);
if (entityType.IsSimpleType())
{
return(entity);
}
AbstractEntityPersister entityMetadata;
try
{
entityMetadata = (AbstractEntityPersister)session.Factory.GetClassMetadata(entityType);
}
catch (Exception)
{
return(entityType.GetDefaultValue());
}
if (resolvedEntities.ContainsKey(entity) && parentEntity != null)
{
return(CopyOnlyForeignKeyProperties(resolvedEntities[entity], entityType, entityMetadata, opts, parentEntity));
}
if (resolvedEntities.ContainsKey(entity))
{
return(resolvedEntities[entity]);
}
if (opts.CanCloneAsReferenceFunc != null && opts.CanCloneAsReferenceFunc(entityType))
{
return(entity);
}
var propertyInfos = entityType.GetProperties();
var copiedEntity = ReflectHelper.GetDefaultConstructor(entityType).Invoke(new object[0]);
resolvedEntities.Add(entity, copiedEntity);
foreach (var propertyInfo in propertyInfos
.Where(p => opts.CanCloneIdentifier(entityType) || entityMetadata.IdentifierPropertyName != p.Name)
.Where(p => !opts.GetIgnoreMembers(entityType).Contains(p.Name))
.Where(p => p.GetSetMethod(true) != null))
{
IType propertyType;
try
{
propertyType = entityMetadata.GetPropertyType(propertyInfo.Name);
}
catch (Exception)
{
continue;
}
var resolveFn = opts.GetResolveFunction(entityType, propertyInfo.Name);
if (resolveFn != null)
{
propertyInfo.SetValue(copiedEntity, resolveFn(entity), null);
continue;
}
if (propertyType.IsEntityType && opts.SkipEntityTypesValue.HasValue && opts.SkipEntityTypesValue.Value)
{
continue;
}
//TODO: verify: false only when entity is a proxy or lazy field/property that is not yet initialized
if (!NHibernateUtil.IsPropertyInitialized(entity, propertyInfo.Name))
{
continue;
}
var propertyValue = propertyInfo.GetValue(entity, null);
if (!NHibernateUtil.IsInitialized(propertyValue))
{
//Use session load for proxy, works only for references (collections are not supported)
if (
propertyValue != null &&
propertyValue.IsProxy() &&
!(propertyValue is IPersistentCollection) &&
opts.UseSessionLoadFunction
)
{
var lazyInit = ((INHibernateProxy)propertyValue).HibernateLazyInitializer;
propertyInfo.SetValue(copiedEntity, LoadEntity(session, lazyInit.PersistentClass, lazyInit.Identifier), null);
}
continue;
}
var filterFn = opts.GetFilterFunction(entityType, propertyInfo.Name);
if (filterFn != null)
{
propertyValue = filterFn(propertyValue);
}
var colNames = entityMetadata.GetPropertyColumnNames(propertyInfo.Name);
var propType = propertyInfo.PropertyType;
var copyAsReference = opts.CanCloneAsReference(entityType, propertyInfo.Name);
if (propertyType.IsCollectionType)
{
var propertyList = CreateNewCollection(propertyType);
propertyInfo.SetValue(copiedEntity, propertyList, null);
AddItemToCollection(propertyList, propertyValue, o => copyAsReference
? o
: session.DeepClone(o, opts, null, resolvedEntities,
new DeepCloneParentEntity
{
Entity = copiedEntity,
EntityPersister = entityMetadata,
ChildType = propertyType,
ReferencedColumns = ((CollectionType)propertyType)
.GetReferencedColumns(session.Factory)
}));
}
else if (propertyType.IsEntityType)
{
if (copyAsReference)
{
propertyInfo.SetValue(copiedEntity, propertyValue, null);
}
//Check if we have a parent entity and that is bidirectional related to the current property (one-to-many)
else if (parentEntity != null && parentEntity.ReferencedColumns.SequenceEqual(colNames))
{
propertyInfo.SetValue(copiedEntity, parentEntity.Entity, null);
}
else
{
propertyInfo.SetValue(copiedEntity, session.DeepClone(propertyValue, opts, propType, resolvedEntities), null);
}
}
else if (propType.IsSimpleType())
{
//Check if we have a parent entity and that is bidirectional related to the current property (one-to-many)
//we dont want to set FKs to the parent entity as the parent is cloned
if (parentEntity != null && parentEntity.ReferencedColumns.Contains(colNames.First()))
{
continue;
}
propertyInfo.SetValue(copiedEntity, propertyValue, null);
}
}
return(copiedEntity);
}
