/// <summary>
/// Tracks the AddRelatedObject method.
/// </summary>
/// <param name="data">The data service context data on which to apply state transition.</param>
/// <param name="source">The source.</param>
/// <param name="sourcePropertyName">Name of the source property.</param>
/// <param name="target">The target.</param>
public static void TrackAddRelatedObject(this DataServiceContextData data, object source, string sourcePropertyName, object target)
{
CheckEntityIsNotTracked(data, target);
EntityDescriptorData sourceDescriptorData = GetTrackedEntityDescriptorData(data, source, "Cannot add link:", "source");
CheckStateIsNot(EntityStates.Deleted, sourceDescriptorData, "Cannot add related object:", "source");
EntityDescriptorData targetDescriptorData = data.CreateEntityDescriptorData(EntityStates.Added, data.GetNextChangeOrder(), target);
data.CreateLinkDescriptorData(EntityStates.Added, uint.MaxValue, sourceDescriptorData, sourcePropertyName, targetDescriptorData);
targetDescriptorData
.SetParentForInsert(source)
.SetParentPropertyForInsert(sourcePropertyName);
}
/// <summary>
/// Tracks the AttachLink method.
/// </summary>
/// <param name="data">The data service context data on which to apply state transition.</param>
/// <param name="source">The source.</param>
/// <param name="sourcePropertyName">Name of the source property.</param>
/// <param name="target">The target.</param>
public static void TrackAttachLink(this DataServiceContextData data, object source, string sourcePropertyName, object target)
{
ExceptionUtilities.CheckArgumentNotNull(data, "data");
LinkDescriptorData linkDescriptorData;
if (data.TryGetLinkDescriptorData(source, sourcePropertyName, target, out linkDescriptorData))
{
throw new TaupoInvalidOperationException(
string.Format(CultureInfo.InvariantCulture, "The link already exists: {0}.", linkDescriptorData.ToString()));
}
EntityDescriptorData sourceDescriptorData = GetTrackedEntityDescriptorData(data, source, "Cannot attach link:", "source");
CheckStateIsNot(EntityStates.Deleted, sourceDescriptorData, "Cannot attach link:", "source");
CheckStateIsNot(EntityStates.Added, sourceDescriptorData, "Cannot attach link:", "source");
EntityDescriptorData targetDescriptorData = null;
if (target != null)
{
targetDescriptorData = GetTrackedEntityDescriptorData(data, target, "Cannot attach link:", "target");
CheckStateIsNot(EntityStates.Deleted, targetDescriptorData, "Cannot attach link:", "target");
CheckStateIsNot(EntityStates.Added, targetDescriptorData, "Cannot attach link:", "target");
}
data.CreateLinkDescriptorData(EntityStates.Unchanged, data.GetNextChangeOrder(), sourceDescriptorData, sourcePropertyName, targetDescriptorData);
}
/// <summary>
/// Tracks the SetLink method.
/// </summary>
/// <param name="data">The data service context data on which to apply state transition.</param>
/// <param name="source">The source.</param>
/// <param name="sourcePropertyName">Name of the source property.</param>
/// <param name="target">The target.</param>
public static void TrackSetLink(this DataServiceContextData data, object source, string sourcePropertyName, object target)
{
ExceptionUtilities.CheckStringArgumentIsNotNullOrEmpty(sourcePropertyName, "sourcePropertyName");
EntityDescriptorData sourceDescriptorData = GetTrackedEntityDescriptorData(data, source, "Cannot set link:", "source");
CheckStateIsNot(EntityStates.Deleted, sourceDescriptorData, "Cannot set link:", "source");
EntityDescriptorData targetDescriptorData = null;
if (target != null)
{
targetDescriptorData = GetTrackedEntityDescriptorData(data, target, "Cannot set link:", "target");
CheckStateIsNot(EntityStates.Deleted, sourceDescriptorData, "Cannot set link:", "target");
}
var relatedToSource = data.LinkDescriptorsData.Where(e => e.SourceDescriptor.Entity == source && e.SourcePropertyName == sourcePropertyName).ToList();
if (relatedToSource.Count > 1)
{
throw new TaupoInvalidOperationException("Cannot set link: source contains multiple links for the property: " + sourcePropertyName);
}
LinkDescriptorData existingLinkDescriptorData = relatedToSource.FirstOrDefault();
if (existingLinkDescriptorData == null)
{
data.CreateLinkDescriptorData(EntityStates.Modified, data.GetNextChangeOrder(), sourceDescriptorData, sourcePropertyName, targetDescriptorData);
}
else
{
if (existingLinkDescriptorData.State != EntityStates.Modified || existingLinkDescriptorData.TargetDescriptor != targetDescriptorData)
{
data.ChangeStateAndChangeOrder(existingLinkDescriptorData, EntityStates.Modified, data.GetNextChangeOrder());
}
existingLinkDescriptorData.TargetDescriptor = targetDescriptorData;
}
}
/// <summary>
/// Tracks the DeleteLink method.
/// </summary>
/// <param name="data">The data service context data on which to apply state transition.</param>
/// <param name="source">The source.</param>
/// <param name="sourcePropertyName">Name of the source property.</param>
/// <param name="target">The target.</param>
public static void TrackDeleteLink(this DataServiceContextData data, object source, string sourcePropertyName, object target)
{
EntityDescriptorData sourceDescriptorData = GetTrackedEntityDescriptorData(data, source, "Cannot delete link:", "source");
EntityDescriptorData targetDescriptorData = GetTrackedEntityDescriptorData(data, target, "Cannot delete link:", "target");
LinkDescriptorData descriptorData;
if (data.TryGetLinkDescriptorData(sourceDescriptorData, sourcePropertyName, targetDescriptorData, out descriptorData)
&& descriptorData.State == EntityStates.Added)
{
data.RemoveDescriptorData(descriptorData);
}
else
{
CheckStateIsNot(EntityStates.Added, sourceDescriptorData, "Cannot delete link:", "source");
CheckStateIsNot(EntityStates.Added, targetDescriptorData, "Cannot delete link:", "target");
if (descriptorData == null)
{
data.CreateLinkDescriptorData(EntityStates.Deleted, data.GetNextChangeOrder(), sourceDescriptorData, sourcePropertyName, targetDescriptorData);
}
else if (descriptorData.State != EntityStates.Deleted)
{
data.ChangeStateAndChangeOrder(descriptorData, EntityStates.Deleted, data.GetNextChangeOrder());
}
}
}
/// <summary>
/// Extension method to either find or create a link descriptor with the given values
/// </summary>
/// <param name="contextData">The context data</param>
/// <param name="sourceDescriptor">The source descriptor</param>
/// <param name="propertyName">The property name</param>
/// <param name="targetDescriptor">The target descriptor</param>
/// <returns>A link descriptor with the given values</returns>
public static LinkDescriptorData MaterializeLinkDescriptor(this DataServiceContextData contextData, EntityDescriptorData sourceDescriptor, string propertyName, EntityDescriptorData targetDescriptor)
{
var existingLink = contextData.LinkDescriptorsData.SingleOrDefault(l => l.SourceDescriptor == sourceDescriptor && l.SourcePropertyName == propertyName && l.TargetDescriptor == targetDescriptor);
if (existingLink == null)
{
existingLink = contextData.CreateLinkDescriptorData(EntityStates.Unchanged, 0, sourceDescriptor, propertyName, targetDescriptor);
}
return existingLink;
}
