CaloVtxReco Refactor for new algorithms

offline/packages/calovtxreco/CaloVtxAlgo.h

@@ -0,0 +1,34 @@
+#ifndef CALOVTXALGO_H
+#define CALOVTXALGO_H
+
+#include <string>
+#include <globalvertex/VertexDefs.h>
+
+class PHCompositeNode;
+
+class CaloVtxAlgo
+{
+ public:
+  virtual ~CaloVtxAlgo() = default;
+
+  // Where set-up occurs:
+  //    Calibrations/ML weights etc
+  //    Basic information from geometry
+
+  virtual int Init(PHCompositeNode * /*topNode*/) { return 0; }
+
+  // Called once per event. Read whatever input this algorithm needs from
+  // topNode and fill vtxz [cm]. Return nonzero (e.g.
+  // Fun4AllReturnCodes::ABORTEVENT) if no vertex could be found.
+
+  virtual int CalculateVertex(PHCompositeNode *topNode, float &zvtx) = 0;
+
+  // Short identifier used to name this algorithm's output node
+  // (e.g. "CALOVTXOUT_MLP") and in log/eval output so results from
+  // different algorithms don't collide and can be compared directly.
+  virtual std::string Name() const = 0;
+
+  virtual VertexDefs::CALOALGO Algo() const = 0;
+};
+
+#endif