public void RemoveLabelsForLink(long userId, long linkId)
{
if (!UserDao.Exists(userId))
{
throw new InstanceNotFoundException <UserProfileDetails>("userId", userId);
}
Link link;
try
{
link = LinkDao.Find(linkId);
}
catch (InstanceNotFoundException <Link> ex)
{
throw new InstanceNotFoundException <LinkDetails>(ex.Properties);
}
if (link.UserProfile.userId != userId)
{
throw new UserNotAuthorizedException <LinkDetails>(userId, linkId);
}
List <Label> removableLabels = new List <Label>();
foreach (Label label in link.Labels)
{
if (label.Links.Contains(link))
{
removableLabels.Add(label);
}
}
foreach (Label label in removableLabels)
{
label.Links.Remove(link);
link.Labels.Remove(label);
LinkDao.Update(link);
if (label.Links.Count > 0)
{
try
{
LabelDao.Update(label);
}
catch (InstanceNotFoundException <Label> ex)
{
throw new InternalErrorException(ex);
}
}
else
{
try
{
LabelDao.Remove(label.labelId);
}
catch (InstanceNotFoundException <Label> ex)
{
throw new InternalErrorException(ex);
}
}
}
}
public void SetLabelsForLink(long userId, long linkId, List <string> labelTexts)
{
if (!UserDao.Exists(userId))
{
throw new InstanceNotFoundException <UserProfileDetails>("userId", userId);
}
Link link;
try
{
link = LinkDao.Find(linkId);
}
catch (InstanceNotFoundException <Link> ex)
{
throw new InstanceNotFoundException <LinkDetails>(ex.Properties);
}
if (link.userId != userId)
{
throw new UserNotAuthorizedException <LinkDetails>(userId, "linkId", linkId);
}
List <Label> labelsToSet = new List <Label>();
foreach (string labelText in labelTexts.Distinct())
{
if (labelText != null)
{
string trimmedLabelText = labelText.Trim();
if (trimmedLabelText != "")
{
Label label;
try
{
label = LabelDao.FindByText(trimmedLabelText);
}
catch (InstanceNotFoundException <Label> )
{
label = Label.CreateLabel(-1, trimmedLabelText);
LabelDao.Create(label);
}
catch (DuplicateInstanceException <Label> ex)
{
throw new InternalErrorException(ex);
}
if (!labelsToSet.Contains(label))
{
labelsToSet.Add(label);
}
}
}
}
List <Label> labelsAlreadyForLink;
try
{
labelsAlreadyForLink = LabelDao.FindForLink(linkId);
}
catch (InstanceNotFoundException <Label> )
{
labelsAlreadyForLink = new List <Label>();
}
foreach (Label labelAlreadyForLink in labelsAlreadyForLink)
{
if (!labelsToSet.Contains(labelAlreadyForLink))
{
link.Labels.Remove(labelAlreadyForLink);
if (labelAlreadyForLink.Links.Count == 1)
{
labelAlreadyForLink.Links.Remove(link);
try
{
LabelDao.Update(labelAlreadyForLink);
}
catch (InstanceNotFoundException <Label> ex)
{
throw new InternalErrorException(ex);
}
}
else
{
try
{
LabelDao.Remove(labelAlreadyForLink.labelId);
}
catch (InstanceNotFoundException <Label> ex)
{
throw new InternalErrorException(ex);
}
}
}
else
{
labelsToSet.Remove(labelAlreadyForLink);
}
}
foreach (Label label in labelsToSet)
{
if (!link.Labels.Contains(label))
{
link.Labels.Add(label);
label.Links.Add(link);
try
{
LabelDao.Update(label);
}
catch (InstanceNotFoundException <Label> ex)
{
throw new InternalErrorException(ex);
}
}
}
try
{
LinkDao.Update(link);
}
catch (InstanceNotFoundException <Link> ex)
{
throw new InternalErrorException(ex);
}
}