OneToOneGeneric.h

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#ifndef DataFormats_Common_OneToOneGeneric_h
#define DataFormats_Common_OneToOneGeneric_h

#include "DataFormats/Common/interface/AssociationMapHelpers.h"
#include "DataFormats/Common/interface/MapRefViewTrait.h"

#include <map>

namespace edm {
  template <typename CKey,
            typename CVal,
            typename index = unsigned int,
            typename KeyRefProd = typename helper::MapRefViewTrait<CKey>::refprod_type,
            typename ValRefProd = typename helper::MapRefViewTrait<CVal>::refprod_type,
            typename KeyRef = typename helper::MapRefViewTrait<CKey>::ref_type,
            typename ValRef = typename helper::MapRefViewTrait<CVal>::ref_type>
  class OneToOneGeneric {
    typedef KeyRefProd keyrefprod_type;
    typedef ValRefProd valrefprod_type;
    typedef index map_assoc;

  public:
    typedef ValRef val_type;
    typedef KeyRef key_type;
    typedef ValRef data_type;
    typedef index index_type;
    typedef std::map<index_type, map_assoc> map_type;
    typedef helpers::KeyVal<keyrefprod_type, valrefprod_type> ref_type;
    typedef std::map<typename CKey::value_type const*, typename CVal::value_type const*> transient_map_type;
    typedef std::vector<typename CKey::value_type const*> transient_key_vector;
    typedef std::vector<typename CVal::value_type const*> transient_val_vector;
    static void insert(ref_type& ref, map_type& m, key_type const& k, data_type const& v) {
      if (k.isNull() || v.isNull()) {
        Exception::throwThis(errors::InvalidReference, "can't insert null references in AssociationMap");
      }
      if (ref.key.isNull()) {
        if (k.isTransient() || v.isTransient()) {
          Exception::throwThis(errors::InvalidReference,
                               "can't insert transient references in uninitialized AssociationMap");
        }
        //another thread might change the value of productGetter()
        auto getter = ref.key.productGetter();
        if (getter == nullptr) {
          Exception::throwThis(errors::LogicError,
                               "Can't insert into AssociationMap unless it was properly initialized.\n"
                               "The most common fix for this is to add arguments to the call to the\n"
                               "AssociationMap constructor that are valid Handle's to the containers.\n"
                               "If you don't have valid handles or either template parameter to the\n"
                               "AssociationMap is a View, then see the comments in AssociationMap.h.\n"
                               "(note this was a new requirement added in the 7_5_X release series)\n");
        }
        ref.key = KeyRefProd(k.id(), getter);
        ref.val = ValRefProd(v.id(), ref.val.productGetter());
      }
      helpers::checkRef(ref.key, k);
      helpers::checkRef(ref.val, v);
      index_type ik = index_type(k.key()), iv = index_type(v.key());
      m[ik] = iv;
    }
    static val_type val(ref_type const& ref, map_assoc iv) { return val_type(ref.val, iv); }
    static typename map_type::size_type size(map_assoc const&) { return 1; }
    static void sort(map_type&) {}
    static transient_map_type transientMap(ref_type const& ref, map_type const& map) {
      transient_map_type m;
      if (!map.empty()) {
        CKey const& ckey = *ref.key;
        CVal const& cval = *ref.val;
        for (typename map_type::const_iterator i = map.begin(); i != map.end(); ++i) {
          typename CKey::value_type const* k = &ckey[i->first];
          typename CVal::value_type const* v = &cval[i->second];
          m.insert(std::make_pair(k, v));
        }
      }
      return m;
    }
    static transient_key_vector transientKeyVector(ref_type const& ref, map_type const& map) {
      transient_key_vector m;
      if (!map.empty()) {
        CKey const& ckey = *ref.key;
        for (typename map_type::const_iterator i = map.begin(); i != map.end(); ++i)
          m.push_back(&ckey[i->first]);
      }
      return m;
    }
    static transient_val_vector transientValVector(ref_type const& ref, map_type const& map) {
      transient_val_vector m;
      if (!map.empty()) {
        CVal const& cval = *ref.val;
        for (typename map_type::const_iterator i = map.begin(); i != map.end(); ++i) {
          m.push_back(&cval[i->second]);
        }
      }
      return m;
    }
  };
}  // namespace edm

#endif