statesChecker.cpp

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/****************************************************************************
 *   This file is part of the aGrUM/pyAgrum library.                        *
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 *   Copyright (c) 2005-2025 by                                             *
 *       - Pierre-Henri WUILLEMIN(_at_LIP6)                                 *
 *       - Christophe GONZALES(_at_AMU)                                     *
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 *       - Pierre-Henri WUILLEMIN(_at_LIP6)                                 *
 *       - Christophe GONZALES(_at_AMU)                                     *
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#include <agrum/FMDP/simulation/statesChecker.h>
 
namespace gum {
 
  StatesChecker::StatesChecker() :
      _nbVisitedStates_(0), _checker_(MultiDimFunctionGraph< bool >::getTreeInstance()),
      _checkerTrueId_(0), _checkerFalseId_(0) {
    GUM_CONSTRUCTOR(StatesChecker);
  }
 
  StatesChecker::~StatesChecker() {
    delete _checker_;
    GUM_DESTRUCTOR(StatesChecker);
  }
 
  void StatesChecker::reset(const Instantiation& initialState) {
    _checker_->clear();
    for (SequenceIteratorSafe< const DiscreteVariable* > varIter
         = initialState.variablesSequence().beginSafe();
         varIter != initialState.variablesSequence().endSafe();
         ++varIter)
      _checker_->add(**varIter);
 
    _nbVisitedStates_ = 1;
    _checkerFalseId_  = _checker_->manager()->addTerminalNode(false);
    _checkerTrueId_   = _checker_->manager()->addTerminalNode(true);
 
    _insertState_(initialState, 0, 0);
  }
 
  void StatesChecker::addState(const Instantiation& state) {
    _nbVisitedStates_++;
 
    NodeId parId   = _checker_->root();
    Idx    parModa = state.valFromPtr(_checker_->node(parId)->nodeVar());
    while (_checker_->node(parId)->son(parModa) != _checkerFalseId_) {
      parId   = _checker_->node(parId)->son(parModa);
      parModa = state.valFromPtr(_checker_->node(parId)->nodeVar());
    }
    _insertState_(state, parId, parModa);
  }
 
  void StatesChecker::_insertState_(const Instantiation& state, NodeId parentId, Idx parentModa) {
    Idx varIter = 0;
    if (parentId) varIter = state.variablesSequence().pos(_checker_->node(parentId)->nodeVar()) + 1;
 
 
    for (; varIter < state.variablesSequence().size(); ++varIter) {
      const DiscreteVariable* curVar = state.variablesSequence().atPos(varIter);
      NodeId                  varId  = _checker_->manager()->addInternalNode(curVar);
      if (parentId) _checker_->manager()->setSon(parentId, parentModa, varId);
      else _checker_->manager()->setRootNode(varId);
      for (Idx moda = 0; moda < curVar->domainSize(); ++moda) {
        if (moda == state.valFromPtr(curVar)) parentModa = moda;
        else _checker_->manager()->setSon(varId, moda, _checkerFalseId_);
      }
      parentId = varId;
    }
    _checker_->manager()->setSon(parentId, parentModa, _checkerTrueId_);
  }
}   // End of namespace gum