/// <summary>
/// Updates the links to the referenced objects
/// </summary>
/// <param name="sourceObject">The object to apply the link rule to</param>
/// <returns>A list of objects that were modified</returns>
private IList <MAObjectHologram> UpdateLinks(MAObjectHologram sourceObject)
{
List <MAObjectHologram> updatedObjects = new List <MAObjectHologram>();
List <MAObjectHologram> targetsToReference = new List <MAObjectHologram>();
List <MAObjectHologram> targetsToDereference = new List <MAObjectHologram>();
IEnumerable <MAObjectHologram> targetsProposed = sourceObject.GetReferencedObjects(this.ForwardLinkAttribute, System.Data.DataRowVersion.Proposed);
IEnumerable <MAObjectHologram> targetsCurrent = sourceObject.GetReferencedObjects(this.ForwardLinkAttribute, System.Data.DataRowVersion.Current);
targetsToReference.AddRange(targetsProposed.Except(targetsCurrent));
targetsToDereference.AddRange(targetsCurrent.Except(targetsProposed));
foreach (MAObjectHologram target in targetsToDereference)
{
Logger.WriteLine("Unlinking object {0} from {1} on object {2} referenced by {3}", LogLevel.Debug, sourceObject.DisplayText, this.BackLinkAttribute.Name, target.DisplayText, this.ForwardLinkAttribute.Name);
target.SetObjectModificationType(ObjectModificationType.Update, false);
this.RemoveReference(sourceObject, target);
updatedObjects.Add(target);
}
foreach (MAObjectHologram target in targetsToReference)
{
Logger.WriteLine("Linking object {0} to {1} on object {2} referenced by {3}", LogLevel.Debug, sourceObject.DisplayText, this.BackLinkAttribute.Name, target.DisplayText, this.ForwardLinkAttribute.Name);
target.SetObjectModificationType(ObjectModificationType.Update, false);
this.AddReference(sourceObject, target);
updatedObjects.Add(target);
}
return(updatedObjects);
}
/// <summary>
/// Gets the object containing the attribute value to use
/// </summary>
/// <param name="sourceObject">The object that is under construction</param>
/// <returns>If the declaration contains a reference to another object, then that object is returned, otherwise the original object is returned</returns>
private IEnumerable <MAObjectHologram> GetSourceObjects(MAObjectHologram sourceObject)
{
if (this.IsReferenced)
{
if (this.ReferencedObjectAttribute == null)
{
throw new InvalidOperationException("The value comparison rule does not have a reference attribute specified");
}
IEnumerable <MAObjectHologram> sources = new List <MAObjectHologram>();
try
{
sources = sourceObject.GetReferencedObjects(this.ReferencedObjectAttribute);
if (!sources.Any())
{
this.RaiseRuleFailure(string.Format("The reference attribute {0} was null", this.ReferencedObjectAttribute.Name));
}
}
catch (ReferencedObjectNotPresentException)
{
this.RaiseRuleFailure(string.Format("The reference attribute {0} referred to an object which did not exist in the database", this.ReferencedObjectAttribute.Name));
}
return(sources);
}
else
{
return(new List <MAObjectHologram>()
{
sourceObject
});
}
}
