OneToMany.h

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#ifndef DataFormats_Common_OneToMany_h
#define DataFormats_Common_OneToMany_h
#include "DataFormats/Common/interface/AssociationMapHelpers.h"
#include "DataFormats/Common/interface/Ref.h"
#include "DataFormats/Common/interface/RefVector.h"
#include "DataFormats/Common/interface/RefProd.h"
#include <map>
#include <vector>

namespace edm {
  template <typename CKey, typename CVal, typename index = unsigned int>
  class OneToMany {
    typedef edm::RefProd<CKey> KeyRefProd;
    typedef edm::RefProd<CVal> ValRefProd;
    typedef std::vector<index> map_assoc;

  public:
    typedef edm::RefVector<CVal> val_type;
    typedef edm::Ref<CKey> key_type;
    typedef edm::Ref<CVal> data_type;
    typedef index index_type;
    typedef std::map<index_type, map_assoc> map_type;
    typedef helpers::KeyVal<KeyRefProd, ValRefProd> ref_type;
    typedef std::map<const typename CKey::value_type *, std::vector<const typename CVal::value_type *> >
        transient_map_type;
    typedef std::vector<const typename CKey::value_type *> transient_key_vector;
    typedef std::vector<std::vector<const typename CVal::value_type *> > transient_val_vector;
    static void insert(ref_type &ref, map_type &m, const key_type &k, const data_type &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 cause productGetter() to change values
        EDProductGetter const *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].push_back(iv);
    }
    static void insert(ref_type &ref, map_type &m, const key_type &k, const val_type &v) {
      for (typename val_type::const_iterator i = v.begin(), iEnd = v.end(); i != iEnd; ++i)
        insert(ref, m, k, *i);
    }
    static val_type val(const ref_type &ref, const map_assoc &iv) {
      val_type v;
      for (typename map_assoc::const_iterator idx = iv.begin(), idxEnd = iv.end(); idx != idxEnd; ++idx)
        v.push_back(edm::Ref<CVal>(ref.val, *idx));
      return v;
    }
    static typename map_type::size_type size(const map_assoc &v) { return v.size(); }
    static void sort(map_type &) {}
    static transient_map_type transientMap(const ref_type &ref, const map_type &map) {
      transient_map_type m;
      if (!map.empty()) {
        const CKey &ckey = *ref.key;
        const CVal &cval = *ref.val;
        for (typename map_type::const_iterator i = map.begin(); i != map.end(); ++i) {
          const map_assoc &a = i->second;
          const typename CKey::value_type *k = &ckey[i->first];
          std::vector<const typename CVal::value_type *> v;
          for (typename map_assoc::const_iterator j = a.begin(); j != a.end(); ++j) {
            const typename CVal::value_type *val = &cval[*j];
            v.push_back(val);
          }
          m.insert(std::make_pair(k, v));
        }
      }
      return m;
    }
    static transient_key_vector transientKeyVector(const ref_type &ref, const map_type &map) {
      transient_key_vector m;
      if (!map.empty()) {
        const CKey &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(const ref_type &ref, const map_type &map) {
      transient_val_vector m;
      if (!map.empty()) {
        const CVal &cval = *ref.val;
        for (typename map_type::const_iterator i = map.begin(); i != map.end(); ++i) {
          const map_assoc &a = i->second;
          std::vector<const typename CVal::value_type *> v;
          m.push_back(v);
          for (typename map_assoc::const_iterator j = a.begin(); j != a.end(); ++j)
            m.back().push_back(&cval[*j]);
        }
      }
      return m;
    }
  };
}  // namespace edm

#endif