/// <summary>
/// Gets the starting point.
/// </summary>
/// <param name="source">The node for which a value is requested.</param>
public virtual ISource GetStart(TSource source)
{
INodeWithResult Result = null;
if (source.EmbeddingFeature is IPropertyFeature AsPropertyFeature)
{
Result = AsPropertyFeature;
}
else if (source.EmbeddingFeature is IIndexerFeature AsIndexerFeature)
{
Result = AsIndexerFeature;
}
else if (source.EmbeddingOverload is IQueryOverload AsQueryOverload)
{
Result = AsQueryOverload;
}
return(Result);
}
/// <summary>
/// Checks if a node source is ready.
/// </summary>
/// <param name="node">The node for which the value is checked.</param>
/// <param name="data">Optional data returned to the caller.</param>
public override bool IsReady(TSource node, out object data)
{
data = null;
bool Result = false;
INodeWithResult EmbeddingNode = StartingPoint.GetStart(node) as INodeWithResult;
if (EmbeddingNode != null)
{
OnceReference <TRef> Value = TemplateHelper.GetPropertyPathValue <INodeWithResult, OnceReference <TRef> >(EmbeddingNode, TemplateNodeStart <INodeWithResult> .Default, PropertyPath, out bool IsInterrupted);
if (!IsInterrupted && Value.IsAssigned)
{
data = Value.Item;
Result = true;
}
}
else
{
Result = true;
}
return(Result);
}
