private void ApplyChanges(CloudLibraryContext workingContext, IList<ChangeSet> changes)
{
foreach (var changeSet in changes.OrderBy(c => c.ChangedObject.ObjectType).ToList())
{
switch (changeSet.ChangedObject.ObjectType)
{
case ObjectType.Library:
var sourceLibrary = (ServiceConnector.Models.Rest.Wallbin.Entities.Library)changeSet.ChangedObject;
workingContext.Library.ImportCloudData(sourceLibrary);
break;
case ObjectType.Page:
var sourceLibraryPage = (ServiceConnector.Models.Rest.Wallbin.Entities.LibraryPage)changeSet.ChangedObject;
var localLibraryPage = workingContext.Library.Pages.FirstOrDefault(page => page.ExtId == sourceLibraryPage.Id);
if (localLibraryPage == null)
{
localLibraryPage = WallbinEntity.CreateEntity<LibraryPage>();
localLibraryPage.Library = workingContext.Library;
workingContext.Library.Pages.Add(localLibraryPage);
}
localLibraryPage.ImportCloudData(sourceLibraryPage);
break;
}
}
workingContext.Library.SyncDate = DateTime.Now;
workingContext.SaveChanges();
}
private void GetPendingChanges(CloudLibraryContext workingContext)
{
var chandedEntries = workingContext.ChangeTracker.Entries()
.Where(entry => entry.State == EntityState.Modified ||
entry.State == EntityState.Added ||
entry.State == EntityState.Deleted)
.ToList();
foreach (var entry in chandedEntries)
{
var wallbinEntity = entry.Entity as WallbinEntity;
if (wallbinEntity == null)
throw new CloudLibraryException("Undefined entity type");
var changeSet = PendingChanges
.FirstOrDefault(existedChangeSet => existedChangeSet.ChangedObject.Id == wallbinEntity.ExtId);
if (changeSet == null)
{
changeSet = new ChangeSet();
switch (entry.State)
{
case EntityState.Added:
changeSet.ChangeType = ChangeType.Add;
break;
case EntityState.Modified:
changeSet.ChangeType = ChangeType.Update;
break;
case EntityState.Deleted:
changeSet.ChangeType = ChangeType.Delete;
break;
default:
throw new CloudLibraryException("Undefined entity change state");
}
PendingChanges.Add(changeSet);
}
else
{
if (entry.State == EntityState.Deleted)
{
if (changeSet.ChangeType == ChangeType.Add)
PendingChanges.Remove(changeSet);
else
changeSet.ChangeType = ChangeType.Delete;
}
}
changeSet.ChangedObject = wallbinEntity.ExportCloudData();
}
}