view nearestaccumulator.h @ 584:e3790284fd4a

Merged through librdf storage hooks and apache2 module.

Squashed commit of the following:

commit a6cfca8f04036e12e7d7fcd55c47224e802582f0
Author: Michael Jewell <mjewell@harrison.(none)>
Date:   Fri Jul 31 15:23:32 2009 +0100

    Removed leftover bits and bobs.

commit f1f0dd074d0767de3e24ba636779fd8701d73d9e
Author: Michael Jewell <mjewell@harrison.(none)>
Date:   Fri Jul 31 15:07:20 2009 +0100

    Simple test of database creation via librdf.

commit 90e6350538e004d8785137e5ff2ac878c22a5d42
Author: Michael Jewell <mjewell@harrison.(none)>
Date:   Fri Jul 31 15:05:10 2009 +0100

    Added the apache2 module which will hook into the librdf storage module

commit c75bf53763b7078c83ae97fcf247da2576baa79a
Author: Michael Jewell <mjewell@harrison.(none)>
Date:   Fri Jul 31 15:04:53 2009 +0100

    Added sparql librdf source - requires the librdf sources to compile.

commit 0646f0190112a73ddb2533537e2cc9832c066b52
Author: Michael Jewell <mjewell@harrison.(none)>
Date:   Mon Jul 27 12:12:26 2009 +0100

    Adding execution to mod_audiodb

commit 8f83f27ba4d917278bca0c7cb665d930e28c86df
Author: Michael Jewell <mjewell@harrison.(none)>
Date:   Wed Jul 22 12:15:57 2009 +0100

    Some initial returns for the sparql handler.

commit dc639aed11943a5b0c379eb47cf293f76908b1b7
Author: Michael Jewell <mjewell@harrison.(none)>
Date:   Wed Jul 22 12:06:20 2009 +0100

    Added a little setup.sh script to do libtoolize/autoconf etc.

commit 3a679da499db647fc82cf2797daeb5cc44ed7655
Author: Michael Jewell <mjewell@harrison.(none)>
Date:   Wed Jul 22 12:03:42 2009 +0100

    Adding initial bits for apache mod

template <class T> class NearestAccumulator : public Accumulator {
public:
  NearestAccumulator();
  ~NearestAccumulator();
  void add_point(adb_result_t *r);
  adb_query_results_t *get_points();
private:
  std::set< adb_result_t, adb_result_triple_lt > *set;
  std::set< adb_result_t, adb_result_qpos_lt > *points;
};

template <class T> NearestAccumulator<T>::NearestAccumulator()
  : set(0), points(0) {
  set = new std::set< adb_result_t, adb_result_triple_lt >;
  points = new std::set< adb_result_t, adb_result_qpos_lt >;
}

template <class T> NearestAccumulator<T>::~NearestAccumulator() {
  if(set) {
    delete set;
  }
  if(points) {
    delete points;
  }
}

template <class T> void NearestAccumulator<T>::add_point(adb_result_t *r) {
  if(!isnan(r->dist)) {
    if(set->find(*r) == set->end()) {
      set->insert(*r);

      std::set< adb_result_t, adb_result_qpos_lt >::iterator it;
      it = points->find(*r);
      if(it == points->end()) {
        points->insert(*r);
      } else if(T()(*(const adb_result_t *)r,(*it))) {
        points->erase(it);
        points->insert(*r);
      }
    }
  }
}

template <class T> adb_query_results_t *NearestAccumulator<T>::get_points() {
  unsigned int nresults = points->size();
  adb_query_results_t *r = (adb_query_results_t *) malloc(sizeof(adb_query_results_t));
  adb_result_t *rs = (adb_result_t *) calloc(nresults, sizeof(adb_result_t));
  r->nresults = nresults;
  r->results = rs;
  std::set< adb_result_t, adb_result_qpos_lt >::iterator it;
  unsigned int k = 0;
  for(it = points->begin(); it != points->end(); it++) {
    rs[k++] = *it;
  }
  return r;
}