FWItemRandomAccessor.h

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#ifndef Fireworks_Core_FWItemRandomAccessor_h
#define Fireworks_Core_FWItemRandomAccessor_h
// -*- C++ -*-
//
// Package:     Core
// Class  :     FWItemRandomAccessor
//
// Original Author:  Giulio Eulisse
//         Created:  Thu Feb 18 15:19:44 EDT 2008
//

// system include files
#include "FWCore/Utilities/interface/ObjectWithDict.h"

// user include files
#include "Fireworks/Core/interface/FWItemAccessorBase.h"
#include "Fireworks/Core/interface/FWItemAccessorRegistry.h"

// forward declarations

class FWItemRandomAccessorBase : public FWItemAccessorBase
{
public:
   ~FWItemRandomAccessorBase() override;

   const void*    data() const override;
   const TClass*  type() const override;
   const TClass*  modelType() const override;

   bool           isCollection() const override;

   void           setData(const edm::ObjectWithDict&) override;
   void   reset() override;

protected:
   void *getDataPtr() const;   
   FWItemRandomAccessorBase(const TClass *type, const std::type_info &modelTypeName);
   const TClass* m_type;
   const TClass* m_modelType;
   mutable void* m_data;

private:
   FWItemRandomAccessorBase(const FWItemRandomAccessorBase&) = delete; // stop default

   const FWItemRandomAccessorBase& operator=(const FWItemRandomAccessorBase&) = delete; // stop default
};

template <class C, class V = typename C::value_type>
class FWItemRandomAccessor : public FWItemRandomAccessorBase 
{
   typedef C container_type;
   typedef V container_value_type;
public:
   FWItemRandomAccessor(const TClass *iClass)
      : FWItemRandomAccessorBase(iClass, typeid(container_value_type))
      {}

   REGISTER_FWITEMACCESSOR_METHODS();

   // ---------- const member functions ---------------------
   const void*    modelData(int iIndex) const override
      {
         if (!getDataPtr())
            return nullptr;
         return &(reinterpret_cast<container_type *>(getDataPtr())->operator[](iIndex));
      }

   unsigned int   size() const override
      {
         if (!getDataPtr())
            return 0;
         return reinterpret_cast<const container_type*>(getDataPtr())->size();
      }
};

template <class C, class COLL = typename C::value_type, class V = typename COLL::value_type >
class FWItemDetSetAccessor : public FWItemRandomAccessorBase
{
public:
   typedef C      container_type;
   typedef COLL   collection_type;
   typedef V      collection_value_type;

   FWItemDetSetAccessor(const TClass *iClass)
      : FWItemRandomAccessorBase(iClass, typeid(collection_value_type))
      {}

   REGISTER_FWITEMACCESSOR_METHODS();

   const void*    modelData(int iIndex) const override
      {
         if (!getDataPtr())
            return nullptr;
         const container_type *c = reinterpret_cast<const container_type*>(getDataPtr());
         size_t collectionOffset = 0;
         for (typename container_type::const_iterator ci = c->begin(), ce = c->end(); ci != ce; ++ci)
         {
            size_t i = iIndex - collectionOffset;
            if (i < ci->size())
               return &(ci->operator[](i));
            collectionOffset += ci->size();
         }

         return nullptr;
      }

   unsigned int   size() const override
      {
         if (!getDataPtr())
            return 0;
         const container_type *c = reinterpret_cast<const container_type*>(getDataPtr());
         size_t finalSize = 0;

         for (typename container_type::const_iterator i = c->begin(), e = c->end(); i != e; ++i)
            finalSize += i->size();
         
         return finalSize;
      }
};

template <class C, class COLL = typename C::value_type, class V = typename COLL::value_type >
class FWItemNewDetSetAccessor : public FWItemRandomAccessorBase
{
public:
   typedef C      container_type;
   typedef COLL   collection_type;
   typedef V      collection_value_type;

   FWItemNewDetSetAccessor(const TClass *iClass)
      : FWItemRandomAccessorBase(iClass, typeid(collection_value_type))
      {}

   REGISTER_FWITEMACCESSOR_METHODS();

   const void*    modelData(int iIndex) const override
      {
         if (!getDataPtr())
            return nullptr;
         const container_type *c = reinterpret_cast<const container_type*>(getDataPtr());
         if (iIndex < 0)
            return nullptr;

         return &(c->data().operator[](iIndex));
      }

   unsigned int   size() const override
      {
         if (!getDataPtr())
            return 0;
         const container_type *c = reinterpret_cast<const container_type*>(getDataPtr());
         return c->dataSize();
      }
};

template <class C, class R = typename C::Range, class V = typename R::value_type>
class FWItemRangeAccessor : public FWItemRandomAccessorBase
{
public:
   typedef C            container_type;
   typedef R            range_type;
   typedef V            value_type;

   FWItemRangeAccessor(const TClass *iClass)
      : FWItemRandomAccessorBase(iClass, typeid(value_type))
      {}

  REGISTER_FWITEMACCESSOR_METHODS();

   const void*    modelData(int iIndex) const override
      {
         if (!getDataPtr())
            return nullptr;
         const container_type *c = reinterpret_cast<const container_type*>(getDataPtr());
         size_t collectionOffset = 0;
         for (typename container_type::const_iterator ci = c->begin(), ce = c->end(); ci != ce; ++ci)
         {
            size_t i = iIndex - collectionOffset;
            if (i < std::distance(ci->first, ci->second))
               return &(*(ci + i));
            collectionOffset += ci->size();
         }

         return nullptr;
      }

   unsigned int   size() const override
      {
         if (!getDataPtr())
            return 0;
         const container_type *c = reinterpret_cast<const container_type*>(getDataPtr());
         size_t finalSize = 0;

         for (typename range_type::const_iterator ci = c->begin(), ce = c->end(); ci != ce; ++ci)
            finalSize += std::distance(ci->first, ci->second);

         return finalSize;
      }
};

template <class C, class V>
class FWItemMuonDigiAccessor : public FWItemRandomAccessorBase
{
public:
   typedef C            container_type;
   typedef V            value_type;

   FWItemMuonDigiAccessor(const TClass *iClass)
      : FWItemRandomAccessorBase(iClass, typeid(value_type))
      {}

  REGISTER_FWITEMACCESSOR_METHODS();

   const void*    modelData(int iIndex) const override
      {
         if (!getDataPtr())
            return nullptr;
         const container_type *c = reinterpret_cast<const container_type*>(getDataPtr());
         size_t collectionOffset = 0;

         for (typename container_type::DigiRangeIterator ci = c->begin(), ce = c->end(); ci != ce; ++ci)
         {
            int i = iIndex - collectionOffset;

            typename container_type::DigiRangeIterator::value_type vt = *ci;


            if (i < std::distance(vt.second.first, vt.second.second))
               return &(*(vt.second.first + i));
            collectionOffset += std::distance(vt.second.first, vt.second.second);
         }

         return nullptr;
      }

   unsigned int   size() const override
      {
         if (!getDataPtr())
            return 0;
         const container_type *c = reinterpret_cast<const container_type*>(getDataPtr());
         size_t finalSize = 0;

         for (typename container_type::DigiRangeIterator ci = c->begin(), ce = c->end(); ci != ce; ++ci)
         {
           typename container_type::DigiRangeIterator::value_type vt = *ci;
           finalSize += std::distance(vt.second.first, vt.second.second);
         }
         
         return finalSize;
      }
};

#endif