nodeGraphPart.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/base/graphs/parts/nodeGraphPart.h>
 
#ifdef GUM_NO_INLINE
#  include <agrum/base/graphs/parts/nodeGraphPart_inl.h>
#endif   // GU%_NO_INLINE
 
namespace gum {

  NodeGraphPart::NodeGraphPart(Size holes_size, bool holes_resize_policy) :
      _holes_size_(holes_size), _holes_resize_policy_(holes_resize_policy),
      _endIteratorSafe_(*this), _boundVal_(0) {
    _holes_ = nullptr;
    GUM_CONSTRUCTOR(NodeGraphPart);
    _updateEndIteratorSafe_();
  }
 
  NodeGraphPart::NodeGraphPart(const NodeGraphPart& s) :
      _holes_size_(s._holes_size_), _holes_resize_policy_(s._holes_resize_policy_),
      _endIteratorSafe_(*this), _boundVal_(s._boundVal_) {
    _holes_ = nullptr;
 
    if (s._holes_) _holes_ = new NodeSet(*s._holes_);
 
    _updateEndIteratorSafe_();
 
    GUM_CONS_CPY(NodeGraphPart);
  }
 
  NodeGraphPart::~NodeGraphPart() {
    if (_holes_) delete _holes_;
 
    GUM_DESTRUCTOR(NodeGraphPart);
  }
 
  void NodeGraphPart::populateNodes(const NodeGraphPart& s) {
    clear();   // "virtual" flush of the nodes set
    _holes_size_          = s._holes_size_;
    _holes_resize_policy_ = s._holes_resize_policy_;
 
    if (s._holes_) _holes_ = new NodeSet(*s._holes_);
 
    _boundVal_ = s._boundVal_;
 
    _updateEndIteratorSafe_();
  }
 
  // id is assumed to belong to NodeGraphPart
  void NodeGraphPart::_addHole_(NodeId node) {
    // we assume that the node exists
    if (node + 1 == _boundVal_) {
      // we remove the max : no new hole and maybe a bunch of holes to remove
      --_boundVal_;
 
      if (_holes_) {
        while (_holes_->contains(_boundVal_ - 1)) {
          // a bunch of holes to remove. We do not use inHoles for optimisation
          // :
          // not to repeat the test if ( _holes_) each time
          _holes_->erase(--_boundVal_);
        }
 
        if (_holes_->empty()) {
          delete _holes_;
          _holes_ = nullptr;
        }
      }
 
      _updateEndIteratorSafe_();
    } else {
      if (!_holes_) _holes_ = new NodeSet(_holes_size_, _holes_resize_policy_);
 
      _holes_->insert(node);
    }
  }
 
  std::string NodeGraphPart::toString() const {
    std::stringstream s;
    bool              first = true;
    s << "{";
 
    for (NodeId id = 0; id < _boundVal_; ++id) {
      if (_inHoles_(id)) continue;
 
      if (first) {
        first = false;
      } else {
        s << ",";
      }
 
      s << id;
    }
 
    s << "}";
 
    return s.str();
  }
 
  std::ostream& operator<<(std::ostream& stream, const NodeGraphPart& set) {
    stream << set.toString();
    return stream;
  }
 
  void NodeGraphPart::addNodeWithId(const NodeId id) {
    if (id >= _boundVal_) {
      if (id > _boundVal_) {   // we have to add holes
        if (!_holes_) _holes_ = new NodeSet(_holes_size_, _holes_resize_policy_);
 
        for (NodeId i = _boundVal_; i < id; ++i)
          _holes_->insert(i);
      }
 
      _boundVal_ = id + 1;
 
      _updateEndIteratorSafe_();
    } else {
      if (_inHoles_(id)) {   // we fill a hole
        _eraseHole_(id);
      } else {
        GUM_ERROR(DuplicateElement, "Id " << id << " is already used")
      }
    }
 
    GUM_EMIT1(onNodeAdded, id);
  }
 
  void NodeGraphPart::_clearNodes_() {
    NodeId bound = _boundVal_;
    _boundVal_   = 0;
 
    if (onNodeDeleted.hasListener()) {
      for (NodeId n = 0; n < bound; ++n) {
        if (!_inHoles_(n)) GUM_EMIT1(onNodeDeleted, n);
      }
    }
 
    _updateEndIteratorSafe_();
 
    delete (_holes_);
    _holes_ = nullptr;
  }
 
  void NodeGraphPartIteratorSafe::whenNodeDeleted(const void* src, NodeId id) {
    if (id == pos_) {   // we just deleted the pos_ in NodeGraphPart
      valid_ = false;
    }
 
    if (pos_ >= nodes_->bound()) {   // moreover, it was the last position
      pos_   = nodes_->bound();
      valid_ = false;
    }
  }
 
} /* namespace gum */