structuralConstraintDAG_inl.h

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#pragma once

#include <agrum/BN/learning/constraints/structuralConstraintDAG.h>   // to ease IDE parser
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
#  include <agrum/agrum.h>
 
#  include <agrum/base/graphs/algorithms/generic/pathFinding.h>
 
namespace gum::learning {
 
  ALWAYS_INLINE void StructuralConstraintDAG::_lock_() const {
    while (_lock_flag_.test_and_set(std::memory_order_acquire)) {}
  }
 
  ALWAYS_INLINE void StructuralConstraintDAG::_unlock_() const {
    _lock_flag_.clear(std::memory_order_release);
  }


  INLINE void StructuralConstraintDAG::setGraphAlone(Size nb_nodes) {
    for (NodeId i = 0; i < nb_nodes; ++i) {
      _graph_.addNodeWithId(i);
    }
  }

  INLINE bool StructuralConstraintDAG::checkArcAdditionAlone(NodeId x, NodeId y) const {
    if (!_graph_.existsNode(x) || !_graph_.existsNode(y)) return false;
    _lock_();
    bool result = !_graph_.existsArc(x, y) && !graph::hasDirectedPath(_graph_, y, x);
    _unlock_();
    return result;
  }

  INLINE bool StructuralConstraintDAG::checkArcDeletionAlone(NodeId x, NodeId y) const {
    _lock_();
    bool result = _graph_.existsArc(x, y);
    _unlock_();
    return result;
  }

  INLINE bool StructuralConstraintDAG::checkArcReversalAlone(NodeId x, NodeId y) const {
    bool result = false;
    _lock_();
    if (_graph_.existsArc(x, y)) {
      _graph_.eraseArc(Arc(x, y));
      result = !graph::hasDirectedPath(_graph_, x, y);
      _graph_.addArc(x, y);
    }
    _unlock_();
    return result;
  }

  INLINE bool StructuralConstraintDAG::checkArcTriangleDeletion1Alone(NodeId node1,
                                                                      NodeId node2,
                                                                      NodeId node3) const {
    bool result = false;
    _lock_();
    if (_graph_.existsArc(node1, node2) && _graph_.existsArc(node1, node3)
        && _graph_.existsArc(node2, node3)) {
      _graph_.eraseArc(Arc(node1, node2));
      _graph_.eraseArc(Arc(node1, node3));
      _graph_.eraseArc(Arc(node2, node3));
      if (!graph::hasDirectedPath(_graph_, node1, node2)) {
        _graph_.addArc(node2, node1);
        result = !graph::hasDirectedPath(_graph_, node1, node3);
        _graph_.eraseArc(Arc(node2, node1));
      }
      _graph_.addArc(node1, node2);
      _graph_.addArc(node1, node3);
      _graph_.addArc(node2, node3);
    }
    _unlock_();
    return result;
  }

  INLINE bool StructuralConstraintDAG::checkArcTriangleDeletion2Alone(NodeId node1,
                                                                      NodeId node2,
                                                                      NodeId node3) const {
    bool result = false;
    _lock_();
    if (_graph_.existsArc(node1, node2) && _graph_.existsArc(node1, node3)
        && _graph_.existsArc(node2, node3)) {
      _graph_.eraseArc(Arc(node1, node3));
      _graph_.eraseArc(Arc(node2, node3));
      result = !graph::hasDirectedPath(_graph_, node2, node3);
      _graph_.addArc(node1, node3);
      _graph_.addArc(node2, node3);
    }
    _unlock_();
    return result;
  }

  INLINE bool StructuralConstraintDAG::checkModificationAlone(const ArcAddition& change) const {
    return checkArcAdditionAlone(change.node1(), change.node2());
  }

  INLINE bool StructuralConstraintDAG::checkModificationAlone(const ArcDeletion& change) const {
    return checkArcDeletionAlone(change.node1(), change.node2());
  }

  INLINE bool StructuralConstraintDAG::checkModificationAlone(const ArcReversal& change) const {
    return checkArcReversalAlone(change.node1(), change.node2());
  }

  INLINE bool
      StructuralConstraintDAG::checkModificationAlone(const ArcTriangleDeletion1& change) const {
    return checkArcTriangleDeletion1Alone(change.node1(), change.node2(), change.node3());
  }

  INLINE bool
      StructuralConstraintDAG::checkModificationAlone(const ArcTriangleDeletion2& change) const {
    return checkArcTriangleDeletion2Alone(change.node1(), change.node2(), change.node3());
  }


  INLINE void StructuralConstraintDAG::modifyGraphAlone(const ArcAddition& change) {
    _lock_();
    _graph_.addArc(change.node1(), change.node2());
    _unlock_();
  }

  INLINE void StructuralConstraintDAG::modifyGraphAlone(const ArcDeletion& change) {
    _lock_();
    _graph_.eraseArc(Arc(change.node1(), change.node2()));
    _unlock_();
  }

  INLINE void StructuralConstraintDAG::modifyGraphAlone(const ArcReversal& change) {
    _lock_();
    _graph_.eraseArc(Arc(change.node1(), change.node2()));
    _graph_.addArc(change.node2(), change.node1());
    _unlock_();
  }

  INLINE void StructuralConstraintDAG::modifyGraphAlone(const ArcTriangleDeletion1& change) {
    _lock_();
    _graph_.eraseArc(Arc(change.node1(), change.node2()));
    _graph_.eraseArc(Arc(change.node1(), change.node3()));
    _graph_.eraseArc(Arc(change.node2(), change.node3()));
    _graph_.addArc(change.node2(), change.node1());
    _graph_.addArc(change.node3(), change.node1());
    _unlock_();
  }

  INLINE void StructuralConstraintDAG::modifyGraphAlone(const ArcTriangleDeletion2& change) {
    _lock_();
    _graph_.eraseArc(Arc(change.node1(), change.node3()));
    _graph_.eraseArc(Arc(change.node2(), change.node3()));
    _graph_.addArc(change.node3(), change.node2());
    _unlock_();
  }


  INLINE bool StructuralConstraintDAG::isAlwaysInvalidAlone(const GraphChange&) const {
    return false;
  }

  INLINE void StructuralConstraintDAG::setGraph(const DAG& graph) { _graph_ = graph; }

  INLINE void StructuralConstraintDAG::setGraph(Size nb_nodes) { setGraphAlone(nb_nodes); }
 
// include all the methods applicable to the whole class hierarchy
#  define GUM_CONSTRAINT_CLASS_NAME StructuralConstraintDAG
#  include <agrum/BN/learning/constraints/structuralConstraintPatternRootInline.h>
#  undef GUM_CONSTRAINT_CLASS_NAME
 
}   // namespace gum::learning
 
 
#endif /* DOXYGEN_SHOULD_SKIP_THIS */