/// <summary>
/// Implements <see cref="ISurveyNodeReferenceDeletion.PreserveSurveyNodeReference"/>.
/// By default, references to elements are preserved if the element is not deleted.
/// </summary>
protected bool PreserveSurveyNodeReference(ISurveyNodeReference reference)
{
return(!this.IsDeleted);
}
bool ISurveyNodeReferenceDeletion.PreserveSurveyNodeReference(ISurveyNodeReference reference)
{
return(PreserveSurveyNodeReference(reference));
}
/// <summary>
/// Private constructor
/// </summary>
private SampleDataElementNode(SurveyTree <SurveyContextType> surveyTree, object contextElement, object element, int nodeData, string displayText, object customSortData, bool verifyReferences)
{
if (element == null)
{
throw new ArgumentNullException("element");
}
myElement = element;
myNodeData = nodeData;
ISurveyNodeReference reference = element as ISurveyNodeReference;
object referencedElement = (reference == null) ? null : reference.ReferencedElement;
if (verifyReferences && referencedElement != null)
{
surveyTree.VerifyReferenceTarget(referencedElement);
}
if (displayText == null)
{
object textElement = element;
ISurveyNode node = textElement as ISurveyNode;
object resolvedReferencedElement = referencedElement;
if (node == null ||
null == (displayText = node.SurveyName))
{
do
{
if (null == resolvedReferencedElement ||
null == (node = (textElement = resolvedReferencedElement) as ISurveyNode) ||
null == (displayText = node.SurveyName))
{
ISurveyNodeReference nextReference;
if (null != (resolvedReferencedElement = (null != (nextReference = resolvedReferencedElement as ISurveyNodeReference)) ? nextReference.ReferencedElement : null))
{
continue;
}
displayText = textElement.ToString();
break;
}
} while (displayText == null && resolvedReferencedElement != null);
}
}
myDisplayText = displayText;
myCustomSortData = customSortData;
if (null == customSortData)
{
ICustomComparableSurveyNode customCompare = element as ICustomComparableSurveyNode;
if (null != customCompare)
{
customCompare.ResetCustomSortData(contextElement, ref myCustomSortData);
}
}
if (verifyReferences && referencedElement != null)
{
// Add a link relating the target element to this node. Note that we're fully constructed at this point
Dictionary <object, LinkedNode <SurveyNodeReference> > links = surveyTree.myReferenceDictionary;
SurveyNodeReference newReference = new SurveyNodeReference(this, contextElement);
LinkedNode <SurveyNodeReference> firstLink = null;
if (links.TryGetValue(referencedElement, out firstLink))
{
LinkedNode <SurveyNodeReference> existingLink = firstLink;
while (existingLink != null)
{
SurveyNodeReference testRef = existingLink.Value;
if ((contextElement == null ? testRef.ContextElement == null : contextElement.Equals(testRef.ContextElement)) &&
element.Equals(testRef.Node.Element))
{
existingLink.Value = newReference;
return;
}
existingLink = existingLink.Next;
}
}
LinkedNode <SurveyNodeReference> newLink = new LinkedNode <SurveyNodeReference>(newReference);
newLink = new LinkedNode <SurveyNodeReference>(newReference);
if (firstLink != null)
{
newLink.SetNext(firstLink, ref firstLink);
}
links[referencedElement] = newLink;
}
}
