observation.h

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/**
 *
 *   Copyright (c) 2005-2021 by Pierre-Henri WUILLEMIN(@LIP6) & Christophe GONZALES(@AMU)
 *   info_at_agrum_dot_org
 *
 *  This library is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with this library.  If not, see <http://www.gnu.org/licenses/>.
 *
 */


/**
 * @file
 * @brief Headers of the Observation class.
 *
 * @author Pierre-Henri WUILLEMIN(@LIP6) and Jean-Christophe MAGNAN and Christophe
 * GONZALES(@AMU)
 */

// #define  TRACE_ALGO
// =========================================================================
#ifndef GUM_OBSERVATION_H
#define GUM_OBSERVATION_H
// =========================================================================
#include <agrum/tools/core/hashTable.h>
#include <agrum/tools/core/smallobjectallocator/smallObjectAllocator.h>
// =========================================================================
#include <agrum/tools/variables/discreteVariable.h>
// =========================================================================

namespace gum {

  /**
   * @class Observation
   * @headerfile observation.h <agrum/FMDP/learning/observation.h>
   * @brief
   * @ingroup fmdp_group
   *
   *
   *
   */

  class Observation {
    public:
    // ==========================================================================
    /// @name Constructor & destructor.
    // ==========================================================================
    /// @{

    // ###################################################################
    /// Default constructor
    // ###################################################################
    Observation() {
      GUM_CONSTRUCTOR(Observation);
      ;
    }

    // ###################################################################
    /// Default destructor
    // ###################################################################
    ~Observation() {
      GUM_DESTRUCTOR(Observation);
      ;
    }

    // ============================================================================
    /// Allocators and Deallocators redefinition
    // ============================================================================
    void* operator new(size_t s) { return SmallObjectAllocator::instance().allocate(s); }
    void  operator delete(void* p) {
      SmallObjectAllocator::instance().deallocate(p, sizeof(Observation));
    }

    /// @}

    // ==========================================================================
    /// @name Observation Handlers
    // ==========================================================================
    /// @{

    // ###################################################################
    /**
     * Returns the modality assumed by the given variable in this observation
     *
     * @throws NotFound if variable is not in this observation
     */
    // ###################################################################
    INLINE Idx modality(const DiscreteVariable* var) const { return _varInst_[var]; }
    INLINE Idx rModality(const DiscreteVariable* var) const { return _rInst_[var]; }

    // ###################################################################
    /**
     * Sets the modality assumed by the given variable in this observation
     *
     * @throws DuplicateElement if a value has already be assigned to
     * this variable
     */
    // ###################################################################
    INLINE void setModality(const DiscreteVariable* var, Idx modality) {
      _varInst_.insert(var, modality);
    }
    INLINE void setRModality(const DiscreteVariable* var, Idx modality) {
      _rInst_.insert(var, modality);
    }

    // ###################################################################
    // Returns the reward obtained during this observation
    // ###################################################################
    double reward() const { return _reward_; }

    // ###################################################################
    // Sets the reward obtained during this observation
    // ###################################################################
    void setReward(double reward) { _reward_ = reward; }

    /// @}
    ///
    std::string toString() const;

    // ==========================================================================
    /// @name Iterators on Variables
    // ==========================================================================
    /// @{

    // ###################################################################
    /// Returns an const safe iterator on the beginning of the list of
    /// variables in this observation
    // ###################################################################
    HashTableConstIteratorSafe< const DiscreteVariable*, Idx > cbeginVariablesSafe() const {
      return _varInst_.cbeginSafe();
    }

    // ###################################################################
    /// Returns an const safe iterator on the end of the list of
    /// variables in this observation
    // ###################################################################
    HashTableConstIteratorSafe< const DiscreteVariable*, Idx > cendVariablesSafe() const {
      return _varInst_.cendSafe();
    }

    /// @}

    private:
    /// Table giving for every variables its instantiation
    HashTable< const DiscreteVariable*, Idx > _varInst_;
    HashTable< const DiscreteVariable*, Idx > _rInst_;

    /// The reward associated to this transition
    double _reward_;
  };

} /* namespace gum */


#endif   // GUM_OBSERVATION_H