Store.h

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#ifndef DDI_Store_h
#define DDI_Store_h

#include <map>
#include "DetectorDescription/Base/interface/rep_type.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"

//;
//FIXME: Store : implement readOnly-behaviour ..
namespace DDI {
   
   template <class N, class I, class K=I>
   class Store 
   {
   public:
      typedef N name_type;
      typedef I  pimpl_type;
      //typedef I* pimpl_type;
      typedef K key_type;
      typedef rep_type<name_type, pimpl_type> Rep_type;  
      // direct way - no comfortable dereferencing of a pointer to rep_type
      //typedef typename std::pair<name_type,pimpl_type> rep_type;
      /*
       struct rep_type {
       rep_type(const name_type & n, pimpl_type p) : first(n), second(p) { }
       key_type first;
       pimpl_type second;
       };
       */ 
      //typedef typename Rep_type<N,I> rep_type;
      
      typedef Rep_type* prep_type;
      
      typedef std::map<name_type,prep_type> registry_type;
      typedef typename registry_type::iterator iterator;
      typedef typename registry_type::const_iterator const_iterator;
      typedef typename registry_type::size_type size_type;
      
      iterator begin() { return reg_.begin(); }
      const_iterator begin() const { return reg_.begin(); }
      iterator end() { return reg_.end(); }
      const_iterator end() const { return reg_.end(); }
      size_type size() const { return reg_.size(); } 
      
      // empty shell or fetch from registry
      prep_type create(const name_type &);
      
      // full new object or replace existing with new one
      prep_type create(const name_type &, pimpl_type);
      
      // anonymous object, not stored
      /*    prep_type create(pimpl_type); */
      
      // clear all objects
      void clear();
      
      // swap moves the registry from this guy to another of the same type
      void swap ( Store& );
      
      bool isDefined(const name_type & n ) const;
      void setReadOnly(bool b) { readOnly_ = b; }
      bool readOnly() const { return readOnly_; }
      
      Store() : readOnly_(false) { }
      ~Store();
      
   protected:
      registry_type reg_;
      Store(const Store &);
      Store & operator=(const Store &);
      bool readOnly_;
   };
   
   
   //   rep_type as nested type inside Store, currently gives
   //   internal compiler error on gcc-2.95.2, but works on SUNWspro62Apr02Sun
   //    
   // template<class N, class I, class K>
   // Store<N,I,K>::rep_type::rep_type(const name_type & n, pimpl_type p)
   //  : std::pair(n,p)
   // { }
   
   /* template<class N, class I, class K> */
   /* void */
   /* Store<N,I,K>::clear() */
   /* { */
   /*   typename registry_type::iterator it = reg_.begin(); */
   /*   for (; it != reg_.end(); ++it) { */
   /*     delete it->second->second; */
   /*     delete it->second; */
   /*   }   */
   /*   reg_.clear(); */
   /* } */
   
   template<class N, class I, class K>
   typename Store<N,I,K>::prep_type 
   Store<N,I,K>::create(const name_type & n)
   {
      prep_type tmp = 0;
      std::pair<typename registry_type::iterator,bool> result 
      = reg_.insert(std::make_pair(n,tmp));
      if (result.second) {
         if (readOnly_) throw cms::Exception("DetectorDescriptionStore")<<" Store has been locked.  Illegal attempt to add " << n << " to a global store."; 
         // ELSE     
         result.first->second = new Rep_type(n,(I)0);
      }
      return result.first->second;    
   }
   
   
   template<class N, class I, class K>
   typename Store<N,I,K>::prep_type 
   Store<N,I,K>::create(const name_type & n, 
                        pimpl_type p)
   {            
      if (readOnly_) throw cms::Exception("DetectorDescriptionStore")<<" Store has been locked.  Illegal attempt to add " << n << " to a global store."; 
      // ELSE     
      prep_type tmp = 0;
      std::pair<typename registry_type::iterator,bool> result 
      = reg_.insert(std::make_pair(n,tmp));
      if (!result.second) {
         delete result.first->second->second;
         result.first->second->second = p;
         //delete result.first->second->swap(p);
      }
      else {
         result.first->second = new Rep_type(n,p);
      }
      return result.first->second;
   }
   
   template<class N, class I, class K>
   Store<N,I,K>::~Store()
   {
      typename registry_type::iterator it = reg_.begin();
      for(; it != reg_.end(); ++it) {
         //     std::cout << "deleting " << it->first << std::endl;
         delete it->second->second; it->second->second = 0;
         delete it->second; it->second = 0;
      }
   } 
   
   /*  template<class N, class I, class K> */
   /*  typename Store<N,I,K>::prep_type  */
   /*  Store<N,I,K>::create(typename Store<N,I,K>::pimpl_type p) */
   /*  {                       */
   /*    if (readOnly_) throw cms::Exception("DetectorDescriptionStore")<<" Store has been locked.  Illegal attempt to add " << name_type() << " to a global store.";  */
   /*     return new Rep_type(name_type(),p); */
   /*  } */
   
   template<class N, class I, class K>
   bool Store<N,I,K>::isDefined(const name_type & n ) const
   {
      if (readOnly_) edm::LogWarning("DetectorDescriptionStore") << " Store is locked and most likely empty.  isDefined will be false.";
      typename registry_type::const_iterator it = reg_.find(n);
      bool result(false);
      if (it != reg_.end()) {
         if (it->second->second) {
            result=true;
         }  
      }
      return result;
   }
   
   template<class N, class I, class K>
   void Store<N, I, K>::swap ( Store<N, I, K>& storeToSwap ) {
      reg_.swap(storeToSwap.reg_);
      storeToSwap.readOnly_ = readOnly_;
   }
   
} // namespace DDI

#endif