Add SiStrip ApproximateClusterCollection as a simple format for RAW

DataFormats/SiStripCluster/interface/SiStripApproximateClusterCollection.h

@@ -0,0 +1,107 @@
+#ifndef DataFormats_SiStripCluster_SiStripApproximateClusterCollection_h
+#define DataFormats_SiStripCluster_SiStripApproximateClusterCollection_h
+
+#include <vector>
+
+#include "DataFormats/SiStripCluster/interface/SiStripApproximateCluster.h"
+
+/**
+ * This class provides a minimal interface that resembles
+ * edmNew::DetSetVector, but is crafted such that we are comfortable
+ * to provide an infinite backwards compatibility guarantee for it
+ * (like all RAW data). Any modifications need to be made with care.
+ * Please consult core software group if in doubt.
+**/
+class SiStripApproximateClusterCollection {
+public:
+  // Helper classes to make creation and iteration easier
+  class Filler {
+  public:
+    void push_back(SiStripApproximateCluster const& cluster) { clusters_.push_back(cluster); }
+
+  private:
+    friend SiStripApproximateClusterCollection;
+    Filler(std::vector<SiStripApproximateCluster>& clusters) : clusters_(clusters) {}
+
+    std::vector<SiStripApproximateCluster>& clusters_;
+  };
+
+  class const_iterator;
+  class DetSet {
+  public:
+    using const_iterator = std::vector<SiStripApproximateCluster>::const_iterator;
+
+    unsigned int id() const { return coll_->detIds_[detIndex_]; }
+
+    const_iterator begin() const { return coll_->clusters_.begin() + clusBegin_; }
+    const_iterator cbegin() const { return begin(); }
+    const_iterator end() const { return coll_->clusters_.begin() + clusEnd_; }
+    const_iterator cend() const { return end(); }
+
+  private:
+    friend SiStripApproximateClusterCollection::const_iterator;
+    DetSet(SiStripApproximateClusterCollection const* coll, unsigned int detIndex)
+        : coll_(coll),
+          detIndex_(detIndex),
+          clusBegin_(coll_->beginIndices_[detIndex]),
+          clusEnd_(detIndex == coll_->beginIndices_.size() - 1 ? coll_->beginIndices_.size()
+                                                               : coll_->beginIndices_[detIndex + 1]) {}
+
+    SiStripApproximateClusterCollection const* const coll_;
+    unsigned int const detIndex_;
+    unsigned int const clusBegin_;
+    unsigned int const clusEnd_;
+  };
+
+  class const_iterator {
+  public:
+    DetSet operator*() const { return DetSet(coll_, index_); }
+
+    const_iterator& operator++() {
+      ++index_;
+      if (index_ == coll_->detIds_.size()) {
+        *this = const_iterator();
+      }
+      return *this;
+    }
+
+    const_iterator operator++(int) {
+      const_iterator clone = *this;
+      ++(*this);
+      return clone;
+    }
+
+    bool operator==(const_iterator const& other) const { return coll_ == other.coll_ and index_ == other.index_; }
+    bool operator!=(const_iterator const& other) const { return not operator==(other); }
+
+  private:
+    friend SiStripApproximateClusterCollection;
+    // default-constructed object acts as the sentinel
+    const_iterator() = default;
+    const_iterator(SiStripApproximateClusterCollection const* coll) : coll_(coll) {}
+
+    SiStripApproximateClusterCollection const* coll_ = nullptr;
+    unsigned int index_ = 0;
+  };
+
+  // Actual public interface
+  SiStripApproximateClusterCollection() = default;
+
+  void reserve(std::size_t dets, std::size_t clusters);
+  Filler beginDet(unsigned int detId);
+
+  const_iterator begin() const { return const_iterator(this); }
+  const_iterator cbegin() const { return begin(); }
+  const_iterator end() const { return const_iterator(); }
+  const_iterator cend() const { return end(); }
+
+private:
+  // The detIds_ and beginIndices_ have one element for each Det. An
+  // element of beginIndices_ points to the first cluster of the Det
+  // in clusters_.
+  std::vector<unsigned int> detIds_;  // DetId for the Det
+  std::vector<unsigned int> beginIndices_;
+  std::vector<SiStripApproximateCluster> clusters_;
+};
+
+#endif

DataFormats/SiStripCluster/src/SiStripApproximateClusterCollection.cc

@@ -0,0 +1,13 @@
+#include "DataFormats/SiStripCluster/interface/SiStripApproximateClusterCollection.h"
+
+void SiStripApproximateClusterCollection::reserve(std::size_t dets, std::size_t clusters) {
+  detIds_.reserve(dets);
+  beginIndices_.reserve(dets);
+  clusters_.reserve(clusters);
+}
+
+SiStripApproximateClusterCollection::Filler SiStripApproximateClusterCollection::beginDet(unsigned int detId) {
+  detIds_.push_back(detId);
+  beginIndices_.push_back(clusters_.size());
+  return Filler(clusters_);
+}

DataFormats/SiStripCluster/src/classes.h

@@ -7,6 +7,7 @@
 #include "DataFormats/SiStripCluster/interface/SiStripCluster.h"
 #include "DataFormats/SiStripCluster/interface/SiStripClustersSOA.h"
 #include "DataFormats/SiStripCluster/interface/SiStripApproximateCluster.h"
+#include "DataFormats/SiStripCluster/interface/SiStripApproximateClusterCollection.h"
 #include "DataFormats/Common/interface/ContainerMask.h"
 
 #endif  // SISTRIPCLUSTER_CLASSES_H

DataFormats/SiStripCluster/src/classes_def.xml

@@ -31,6 +31,10 @@
   <version ClassVersion="4" checksum="2854791577"/>
   <version ClassVersion="3" checksum="2041370183"/>
  </class>
+ <class name="SiStripApproximateClusterCollection" ClassVersion="3">
+  <version ClassVersion="3" checksum="3101417750"/>
+ </class>
+ <class name="edm::Wrapper<SiStripApproximateClusterCollection>"/>
 
  <class name="edmNew::DetSetVector<SiStripApproximateCluster>"/>
  <class name="edm::Wrapper<edmNew::DetSetVector<SiStripApproximateCluster>>"/>

RecoLocalTracker/SiStripClusterizer/plugins/SiStripApprox2Clusters.cc

@@ -1,6 +1,6 @@
-#include "DataFormats/Common/interface/DetSetVector.h"
 #include "DataFormats/Common/interface/DetSetVectorNew.h"
 #include "DataFormats/SiStripCluster/interface/SiStripApproximateCluster.h"
+#include "DataFormats/SiStripCluster/interface/SiStripApproximateClusterCollection.h"
 #include "DataFormats/SiStripCluster/interface/SiStripCluster.h"
 #include "FWCore/Framework/interface/Event.h"
 #include "FWCore/Framework/interface/Frameworkfwd.h"
@@ -25,13 +25,12 @@ class SiStripApprox2Clusters : public edm::global::EDProducer<> {
   static void fillDescriptions(edm::ConfigurationDescriptions& descriptions);
 
 private:
-  edm::EDGetTokenT<edmNew::DetSetVector<SiStripApproximateCluster>> clusterToken_;
+  edm::EDGetTokenT<SiStripApproximateClusterCollection> clusterToken_;
   edm::ESGetToken<TrackerGeometry, TrackerDigiGeometryRecord> tkGeomToken_;
 };
 
 SiStripApprox2Clusters::SiStripApprox2Clusters(const edm::ParameterSet& conf) {
-  clusterToken_ = consumes<edmNew::DetSetVector<SiStripApproximateCluster>>(
-      conf.getParameter<edm::InputTag>("inputApproxClusters"));
+  clusterToken_ = consumes(conf.getParameter<edm::InputTag>("inputApproxClusters"));
   tkGeomToken_ = esConsumes();
   produces<edmNew::DetSetVector<SiStripCluster>>();
 }

RecoLocalTracker/SiStripClusterizer/plugins/SiStripClusters2ApproxClusters.cc

@@ -20,6 +20,10 @@
 #include "FWCore/ParameterSet/interface/FileInPath.h"
 #include "FWCore/ParameterSet/interface/ParameterSet.h"
 #include "FWCore/ParameterSet/interface/ParameterSetDescription.h"
+#include "DataFormats/SiStripCluster/interface/SiStripApproximateCluster.h"
+#include "DataFormats/SiStripCluster/interface/SiStripApproximateClusterCollection.h"
+#include "DataFormats/SiStripCluster/interface/SiStripCluster.h"
+#include "DataFormats/Common/interface/DetSetVectorNew.h"
 #include "FWCore/Utilities/interface/ESInputTag.h"
 #include "FWCore/Utilities/interface/InputTag.h"
 #include "Geometry/Records/interface/TrackerDigiGeometryRecord.h"
@@ -84,12 +88,13 @@ SiStripClusters2ApproxClusters::SiStripClusters2ApproxClusters(const edm::Parame
 
   stripNoiseToken_ = esConsumes();
 
-  produces<edmNew::DetSetVector<SiStripApproximateCluster> >();
+  produces<SiStripApproximateClusterCollection>();
 }
 
 void SiStripClusters2ApproxClusters::produce(edm::Event& event, edm::EventSetup const& iSetup) {
-  auto result = std::make_unique<edmNew::DetSetVector<SiStripApproximateCluster> >();
   const auto& clusterCollection = event.get(clusterToken);
+  auto result = std::make_unique<SiStripApproximateClusterCollection>();
+  result->reserve(clusterCollection.size(), clusterCollection.dataSize());
 
   auto const beamSpotHandle = event.getHandle(beamSpotToken_);
   auto const& bs = beamSpotHandle.isValid() ? *beamSpotHandle : reco::BeamSpot();
@@ -103,7 +108,7 @@ void SiStripClusters2ApproxClusters::produce(edm::Event& event, edm::EventSetup
   const auto& theNoise_ = &iSetup.getData(stripNoiseToken_);
 
   for (const auto& detClusters : clusterCollection) {
-    edmNew::DetSetVector<SiStripApproximateCluster>::FastFiller ff{*result, detClusters.id()};
+    auto ff = result->beginDet(detClusters.id());
 
     unsigned int detId = detClusters.id();
     const GeomDet* det = tkGeom->idToDet(detId);