protected IHierarchicalData Build(List <Artifact> artifacts)
{
var data = BuildHierarchy(artifacts);
try
{
data.RemoveLeafNodesWithoutArea(); // throws if nothing is left
data.SumAreaMetrics();
data.NormalizeWeightMetrics();
}
catch (Exception)
{
return(HierarchicalData.NoData());
}
return(data.Shrink());
}