public DocumentNodeCounts(SrmDocument doc)
{
IsPeptideOnly = doc.DocumentType == SrmDocument.DOCUMENT_TYPE.proteomic;
MoleculeGroupCount = doc.GetCount((int)SrmDocument.Level.MoleculeGroups);
MoleculeCount = doc.GetCount((int)SrmDocument.Level.Molecules);
PrecursorCount = doc.GetCount((int)SrmDocument.Level.TransitionGroups);
TransitionCount = doc.GetCount((int)SrmDocument.Level.Transitions);
}