trie/trie_manipulators/sequence/CandidateGeneratorNoprune.hpp

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#ifndef CandidateGeneratorNoprune_HPP
#define CandidateGeneratorNoprune_HPP

#include "common.hpp"
#include "common/Edge.hpp"
#include "common/log.h"
#include "apriori/bodon/trie/trie_manipulators/ManipulatorBase.hpp"
#include <vector>
//#include <cstdio>
//#include <iterator>   //for test




namespace Bodon
{
namespace sequence
{
   template <class DF_D, class TRIE>
   class CandidateGeneratorNoprune : public ManipulatorBase<DF_D, TRIE>
   {
      protected:
         std::vector<Edge> extenders;
         unsigned int nr_of_new_candidates;
         unsigned int nr_of_all_candidates;

      public:
         CandidateGeneratorNoprune( TRIE& main_trie, DF_D& df_decoder ) : 
            ManipulatorBase<DF_D, TRIE>(main_trie, df_decoder),
            nr_of_all_candidates(0){}


         void generateCandidate(unsigned int candidate_size);
         
         void afterWorkCandGen();
      protected:

         void generateCandidateAtParent( TRIE* trie );
         void generateCandidateFindParent( 
            TRIE* trie, unsigned int step_to_freq_par);

      public:
         // No public members
   };


   template <class DF_D, class TRIE> 
   void CandidateGeneratorNoprune<DF_D, TRIE>::
   generateCandidate(unsigned int candidate_size)
   {
      assert(candidate_size > 1);
      nr_of_new_candidates = 0;
      generateCandidateFindParent( &main_trie,
                                   candidate_size -2 );
      log_debug(0, "Number of newly generated candidates: %d", nr_of_new_candidates);
#if DEBUG_LEVEL >= LEVEL_DBG
      nr_of_all_candidates += nr_of_new_candidates;
#endif
   }
   template <class DF_D, class TRIE> 
   void CandidateGeneratorNoprune<DF_D, TRIE>::
   afterWorkCandGen()
   {
      log_dbg(0, "The total number of generated candidates: %d", nr_of_all_candidates);
   }


   template <class DF_D, class TRIE> inline void 
   CandidateGeneratorNoprune<DF_D, TRIE>::
   generateCandidateAtParent(TRIE* trie)
   {
      typename TRIE::iterator itEdge( trie->edgelist.begin() ), itEdge2;
      TRIE* toExtend;
      while( itEdge != trie->edgelist.end() )
      {
         toExtend = static_cast<TRIE*>((*itEdge).second);
         df_decoder.pushItemWithWrite( (*itEdge).first, 
                                       toExtend->getCounter() );
         df_decoder.popItem();
         extenders.clear();
         for( itEdge2 = trie->edgelist.begin(); 
              itEdge2 != trie->edgelist.end(); ++itEdge2 )
            extenders.push_back(Edge((*itEdge2).first, new TRIE(0)));
         if(extenders.empty())
         {
            delete toExtend;
            itEdge = trie->edgelist.erase(itEdge);
         }
         else 
         {
            toExtend->edgelist.insert(extenders);
            ++itEdge;
         }
      }
   }


   template <class DF_D, class TRIE> void
   CandidateGeneratorNoprune<DF_D, TRIE>::
   generateCandidateFindParent( TRIE* trie, 
                                unsigned int step_to_freq_par)
   {
      typename TRIE::iterator itEdge( trie->edgelist.begin() );
      if(step_to_freq_par)
      {
         --step_to_freq_par;
         while( itEdge != trie->edgelist.end() )
         {
            df_decoder.pushItem( (*itEdge).first );
            generateCandidateFindParent( 
               static_cast<TRIE*>((*itEdge).second), step_to_freq_par);
            if(static_cast<TRIE*>((*itEdge).second)->edgelist.empty())
            {
               delete static_cast<TRIE*>((*itEdge).second);
               itEdge = trie->edgelist.erase(itEdge);
            }
            else ++itEdge;
            df_decoder.popItem();
         }
      }
      else
      {
         generateCandidateAtParent(trie);
#if DEBUG_LEVEL >= LEVEL_DBG
         for( typename TRIE::iterator it( trie->edgelist.begin() );
              it != trie->edgelist.end(); ++it)
            nr_of_new_candidates += 
               static_cast<TRIE*>((*it).second)->edgelist.size();
#endif
      }
   }
}
}
#endif

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