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#ifndef DataFormats_Common_Association_h
#define DataFormats_Common_Association_h
/* \class Association<RefProd>
*
* \author Luca Lista, INFN
*
*
*/
#include "DataFormats/Common/interface/CMS_CLASS_VERSION.h"
#include "DataFormats/Common/interface/Ref.h"
#include "DataFormats/Common/interface/RefProd.h"
#include "DataFormats/Common/interface/ValueMap.h"
namespace edm {
template <typename C>
class Association : private ValueMap<int> {
public:
typedef int index; // negative index == null reference
typedef ValueMap<index> base;
typedef typename base::offset offset;
typedef edm::RefProd<C> refprod_type; // could be specialized for View
typedef Ref<typename refprod_type::product_type> reference_type;
Association() : base() {}
template <typename H>
explicit Association(const H& h) : base(), ref_(h) {}
// import this function from ValueMap<int>
using base::rawIndexOf;
template <typename RefKey>
reference_type operator[](const RefKey& r) const {
return get(r.id(), r.key());
}
/// meant to be used internally or in AssociativeIterator, not by the ordinary user
reference_type get(size_t rawIdx) const {
index i = values_[rawIdx];
if (i < 0)
return reference_type();
size_t k = i;
if (k >= ref_->size())
throwIndexMapBound();
return reference_type(ref_, k);
}
reference_type get(ProductID id, size_t idx) const { return get(rawIndexOf(id, idx)); }
Association<C>& operator+=(const Association<C>& o) {
add(o);
return *this;
}
void setRef(const refprod_type& ref) {
if (ref_.isNull()) {
ref_ = ref;
} else {
if (ref_.id() != ref.id())
throwRefSet();
}
}
bool contains(ProductID id) const { return base::contains(id); }
size_t size() const { return base::size(); }
bool empty() const { return base::empty(); }
void clear() { base::clear(); }
refprod_type ref() const { return ref_; }
void swap(Association& other) {
this->ValueMap<int>::swap(other);
ref_.swap(other.ref_);
}
class Filler : public helper::Filler<Association<C> > {
typedef helper::Filler<Association<C> > base;
public:
explicit Filler(Association<C>& association) : base(association) {}
void add(const Association<C>& association) {
base::map_.setRef(association.ref());
base::add(association);
}
};
/// meant to be used in AssociativeIterator, not by the ordinary user
const id_offset_vector& ids() const { return ids_; }
/// meant to be used in AssociativeIterator, not by the ordinary user
using base::id_offset_vector;
//Used by ROOT storage
CMS_CLASS_VERSION(10)
private:
refprod_type ref_;
void throwIndexMapBound() const {
Exception::throwThis(errors::InvalidReference, "Association: index in the map out of upper boundary\n");
}
void throwRefSet() const {
Exception::throwThis(errors::InvalidReference, "Association: reference to product already set\n");
}
void add(const Association<C>& o) {
Filler filler(*this);
filler.add(o);
filler.fill();
}
friend class helper::Filler<Association<C> >;
};
// Free swap function
template <typename C>
inline void swap(Association<C>& lhs, Association<C>& rhs) {
lhs.swap(rhs);
}
template <typename C>
inline Association<C> operator+(const Association<C>& a1, const Association<C>& a2) {
Association<C> a = a1;
a += a2;
return a;
}
} // namespace edm
#endif
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