private SaveModel BuildSaveModel(SaveWorkState saveWorkState)
{
SaveModel saveModel = new SaveModel(this.context);
foreach (var kvp in saveWorkState.SaveMap)
{
Type entityType = kvp.Key;
List <EntityInfo> entityInfos = kvp.Value;
saveModel.AddRange(entityType, entityInfos);
}
return(saveModel);
}
private void ExecuteSaveHandlers(SaveModel saveModel)
{
List <ISaveHandler> saveHandlers = CreateSaveHandlers();
foreach (ISaveHandler saveHandler in saveHandlers)
{
SaveEntitySet saveEntitySet = saveModel.GetEntitySet(saveHandler.EntityType);
if (saveEntitySet != null)
{
foreach (SaveEntity saveEntity in saveEntitySet)
{
saveHandler.Save(saveEntity);
}
}
}
}
protected virtual void ValidateSaveState(SaveModel saveModel)
{
foreach (SaveEntitySet saveEntitySet in saveModel.GetEntitySets())
{
foreach (SaveEntity saveEntity in saveEntitySet)
{
// Check that all added/deleted entities have been processed
// TODO: Have they?
// Check that all property values have been processed
foreach (SaveProperty saveProperty in saveEntity.Properties)
{
if (saveProperty.State == SavePropertyState.Pending &&
!saveProperty.IsNewValueEqual(saveEntity.Entity))
{
throw new Exception("Property value was not saved by a SaveHandler.");
}
}
}
}
}
protected override void SaveChangesCore(SaveWorkState saveWorkState)
{
SaveModel saveModel = BuildSaveModel(saveWorkState);
LoadEntities(saveModel);
ExecuteSaveHandlers(saveModel);
ValidateSaveState(saveModel);
try
{
this.Context.SaveChanges();
}
catch (DbEntityValidationException e)
{
// TODO: Set saveWorkState.EntityErrors
throw new NotImplementedException();
}
// TODO: Set saveWorkState.KeyMappings
// TODO: Update saveWorkState entities from the ones in this.Context
}
protected virtual void LoadEntities(SaveModel saveModel)
{
foreach (SaveEntitySet saveEntitySet in saveModel.GetEntitySets())
{
Type entityType = saveEntitySet.EntityType;
ApiEntityTypeConfiguration entityTypeConfig;
if (!this.Model.TryGetEntityTypeConfig(entityType, out entityTypeConfig))
{
throw new Exception("Entity type not supported.");
}
object resource = this.resources[entityTypeConfig.ResourceType];
IQueryable queryable = (IQueryable)entityTypeConfig.ResourceAccessor.DynamicInvoke(resource);
// TODO: It's not always int IDs
PropertyInfo idPropertyInfo = entityType.GetProperty("Id");
List <int> ids = saveEntitySet.Where(m => !m.IsAdded).Select(
m => (int)idPropertyInfo.GetValue(m.EntityInfo.Entity)).ToList();
var arg = Expression.Parameter(entityType, "p");
var body = Expression.Call(Expression.Constant(ids), "Contains", null,
Expression.Property(arg, "Id"));
var predicate = Expression.Lambda(body, arg);
var where = Expression.Call(typeof(Queryable), "Where",
new Type[] { queryable.ElementType },
queryable.Expression, Expression.Quote(predicate));
foreach (object entity in queryable.Provider.CreateQuery(where))
{
int id = (int)idPropertyInfo.GetValue(entity);
SaveEntity saveEntity = saveEntitySet.First(m => (int)idPropertyInfo.GetValue(m.EntityInfo.Entity) == id);
saveEntity.Entity = entity;
}
}
}
