simpleMolecularGraph.h

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// -*- Mode: C++; tab-width: 2; -*-
// vi: set ts=2:
//

#ifndef BALL_STRUCTURE_SIMPLEMOLECULARGRAPH_H
#define BALL_STRUCTURE_SIMPLEMOLECULARGRAPH_H

#ifndef BALL_KERNEL_ATOM_H
# include <BALL/KERNEL/atom.h>
#endif

#ifndef BALL_KERNEL_BOND_H
# include <BALL/KERNEL/bond.h>
#endif

#ifndef BALL_STRUCTURE_MOLECULE_H
# include <BALL/KERNEL/molecule.h>
#endif

#ifndef BALL_STRUCTURE_FRAGMENT_H
# include <BALL/KERNEL/fragment.h>
#endif

#include <list>
#include <iostream>
#include <algorithm>

namespace BALL
{
  // forward declarations to resolve nasty dependencies
  template <typename Node, typename Edge> 
  class EdgeItem;

  template <typename Node, typename Edge> 
  class TSimpleMolecularGraph;

  template <typename Node, typename Edge>
  class NodeItem
  {
    public:
    typedef NodeItem<Node, Edge> NodeItemType;

    typedef EdgeItem<Node, Edge> EdgeItemType;

    typedef typename std::list<EdgeItem<Node, Edge>*>::iterator Iterator;
    typedef typename std::list<EdgeItem<Node, Edge>*>::const_iterator ConstIterator;

    friend class TSimpleMolecularGraph<Node, Edge>;

    NodeItem() ;
    NodeItem(const Atom& atom) ;

    Node& getData() ;
    const Node& getData() const ;
    void setData(const Node& data) ;

    const Atom* getAtom() const ;
    Atom* getAtom() ;

    Iterator begin() ;
    ConstIterator begin() const ;
    Iterator end() ;
    ConstIterator end() const ;

    Size getDegree() const ;

    bool operator == (const NodeItem& item) const ;
    bool operator != (const NodeItem& item) const ;

    protected:

    void deleteEdge_(EdgeItemType* item)
      ;

    Node  data_;
    Atom* atom_;
    std::list<EdgeItemType*> adjacent_edges_;
  };


  template <typename Node, typename Edge>
  class EdgeItem
  {
    public:
    typedef NodeItem<Node, Edge> NodeItemType;
    typedef EdgeItem<Node, Edge> EdgeItemType;
    typedef typename std::list<NodeItem<Node, Edge>*>::iterator Iterator;
    typedef typename std::list<NodeItem<Node, Edge>*>::const_iterator ConstIterator;

    EdgeItem() 
      : bond_(0), source_(0), target_(0)
    {}

    EdgeItem(const Bond& bond);
    EdgeItem(const Bond& bond, NodeItemType* source, NodeItemType* target);

    NodeItemType& getSource() {return *source_;}
    NodeItemType& getTarget() {return *target_;}
    const NodeItemType& getSource() const {return *source_;}
    const NodeItemType& getTarget() const {return *target_;}
    
    Node& getData() {return data_;}
    const Node& getData() const {return data_;}
    void setData(const Edge& data) { data_ = data; };

    Bond* getBond() { return bond_; }
    const Bond* getBond() const { return bond_; }

    bool operator == (const EdgeItem& item) const { return (bond_ == item.bond_); }
    bool operator != (const EdgeItem& item) const { return (bond_ != item.bond_); }

    protected:
    Edge  data_;
    Bond* bond_;
    NodeItemType* source_;
    NodeItemType* target_;
  };

  template <typename Node, typename Edge>
  EdgeItem<Node, Edge>::EdgeItem(const Bond& bond)
    : bond_(const_cast<Bond*>(&bond))
  {
  }

  template <typename Node, typename Edge>
  EdgeItem<Node, Edge>::EdgeItem(const Bond& bond, NodeItem<Node, Edge>* first, NodeItem<Node, Edge>* second)
    : bond_(const_cast<Bond*>(&bond)),
      source_(first),
      target_(second)
  {
  }

  template <typename Node, typename Edge>
  class TSimpleMolecularGraph
  {
    public:
    typedef NodeItem<Node, Edge> NodeItemType;
    typedef EdgeItem<Node, Edge> EdgeItemType;
    typedef typename std::list<NodeItemType>::iterator NodeIterator;
    typedef typename std::list<NodeItemType>::const_iterator NodeConstIterator;
    typedef typename std::list<EdgeItemType>::iterator EdgeIterator;
    typedef typename std::list<EdgeItemType>::const_iterator EdgeConstIterator;

    TSimpleMolecularGraph() ;
    TSimpleMolecularGraph(const Molecule& molecule) ;

    bool newNode(const Atom& atom) ;
    bool newEdge(const Bond& bond) ;

    bool deleteNode(NodeItemType& node);
    bool deleteEdge(EdgeItemType& edge);
        
    bool deleteNode(const Atom& atom);
    bool deleteEdge(const Bond& bond);
        
    NodeIterator beginNode() { return nodes_.begin(); }
    NodeConstIterator beginNode() const { return nodes_.begin(); }
    EdgeIterator beginEdge() { return edges_.begin(); }
    EdgeConstIterator beginEdge() const { return edges_.begin(); }
    NodeIterator endNode() { return nodes_.end(); }
    NodeConstIterator endNode() const { return nodes_.end(); }
    EdgeIterator endEdge() { return edges_.end(); }
    EdgeConstIterator endEdge() const { return edges_.end(); }
    
    bool has(const Atom& atom) const { return atom_to_node_.has(const_cast<Atom*>(&atom)); }
    bool has(const Bond& bond) const { return bond_to_edge_.has(const_cast<Bond*>(&bond)); }

    NodeItemType& getNode(Position index) { return nodes_[index]; };
    const NodeItemType& getNode(Position index) const { return nodes_[index]; };
    EdgeItemType& getEdge(Position index) { return edges_[index]; };
    const EdgeItemType& getEdge(Position index) const { return edges_[index]; };

    Size getNumberOfNodes() const ;

    Size getNumberOfEdges() const ;

    protected:
    std::list<NodeItemType> nodes_;
    std::list<EdgeItemType> edges_;
    HashMap<Atom*, NodeItemType*> atom_to_node_;
    HashMap<Bond*, EdgeItemType*> bond_to_edge_;
  };

  typedef TSimpleMolecularGraph<Index, Index> SimpleMolecularGraph;

  template <typename Node, typename Edge>
  TSimpleMolecularGraph<Node, Edge>::TSimpleMolecularGraph()
      
    : nodes_(),
      edges_(),
      atom_to_node_(),
      bond_to_edge_()
  {
  }

  template <typename Node, typename Edge>
  TSimpleMolecularGraph<Node, Edge>::TSimpleMolecularGraph(const Molecule& molecule)
      
    : nodes_(),
      edges_(),
      atom_to_node_(),
      bond_to_edge_()
  {
    AtomConstIterator ai = molecule.beginAtom();
    Atom::BondConstIterator bi;
    for (; +ai; ++ai)
    {
      newNode(*ai);
    }
    for (ai = molecule.beginAtom(); +ai; ++ai)
    {
      for (bi = ai->beginBond(); +bi; ++bi)
      {
        if (bi->getFirstAtom() == &*ai)
        {
          newEdge(*bi);
        }
      }
    }
  }

  template <typename Node, typename Edge>
  bool TSimpleMolecularGraph<Node, Edge>::newNode(const Atom& atom)
    
  {
    Atom* atom_ptr = const_cast<Atom*>(&atom);

    if (atom_to_node_.has(atom_ptr))
    {
      return false;
    }

    nodes_.push_back(NodeItemType(atom));
    atom_to_node_.insert(std::pair<Atom*, NodeItemType*>(atom_ptr, &(nodes_.back())));

    return true;
  }

  template <typename Node, typename Edge>
  bool TSimpleMolecularGraph<Node, Edge>::newEdge(const Bond& bond)
    
  {
    // Create convenience aliases for atoms.
    Atom* first = const_cast<Atom*>(bond.getFirstAtom());
    Atom* second = const_cast<Atom*>(bond.getSecondAtom()); 

    // Make sure we have atoms/nodes for this bond/edge.
    if (!atom_to_node_.has(first) || !atom_to_node_.has(second))
    {
      return false;
    }

    // Make sure not to create the same edge twice.
    if (bond_to_edge_.has(const_cast<Bond*>(&bond)))
    {
      return true;
    }
    
    // Create the new edge und add it to the hash map relating
    // the bond to the edge.
    NodeItemType* first_item = atom_to_node_[first];
    NodeItemType* second_item = atom_to_node_[second];
    edges_.push_back(EdgeItemType(bond, first_item, second_item));
    bond_to_edge_.insert(std::pair<Bond*, EdgeItemType*>(const_cast<Bond*>(&bond), &edges_.back()));
    first_item->adjacent_edges_.push_back(&edges_.back());
    second_item->adjacent_edges_.push_back(&edges_.back());

    return true;
  }

  template <typename Node, typename Edge>
  std::ostream& operator << (std::ostream& os, const TSimpleMolecularGraph<Node, Edge>& G)
  {   
    os << "Nodes:" << std::endl;

    typename TSimpleMolecularGraph<Node, Edge>::NodeConstIterator node = G.beginNode();
    Size count = 0;
    for (; node != G.endNode(); ++node)
    {
      os << count++ << ": " << node->getAtom()->getFullName() << " [" << node->getDegree() << "] '" << node->getAtom() << "'" << std::endl;     
    }

    os << "Edges:" << std::endl;  

    typename TSimpleMolecularGraph<Node, Edge>::EdgeConstIterator edge = G.beginEdge();
    count = 0;
    for (; edge != G.endEdge(); ++edge)
    {
      os << count++ << ": " << edge->getSource().getAtom() << "-" << edge->getTarget().getAtom() << " '" << edge->getBond() << "'" << std::endl;
    }

    return os;
  }

  template <typename Node, typename Edge>
  bool TSimpleMolecularGraph<Node, Edge>::deleteNode(const Atom& atom)
  {
    if (!atom_to_node_.has(const_cast<Atom*>(&atom)))
    {
      return false;
    }
    
    return deleteNode(*atom_to_node_[const_cast<Atom*>(&atom)]);
  }

  template <typename Node, typename Edge>
  bool TSimpleMolecularGraph<Node, Edge>::deleteEdge(const Bond& bond)
  {
    if (!bond_to_edge_.has(const_cast<Bond*>(&bond)))
    {
      return false;
    }
    
    return deleteEdge(*bond_to_edge_[const_cast<Bond*>(&bond)]);
  }

  template <typename Node, typename Edge>
  bool TSimpleMolecularGraph<Node, Edge>::deleteNode(typename TSimpleMolecularGraph<Node, Edge>::NodeItemType& node)
  {
    NodeIterator node_it = std::find(nodes_.begin(), nodes_.end(), node);
    if (node_it == nodes_.end())
    {
      return false;
    }

    bool remove = true;
    while (remove)
    {
      remove = false;
      typename NodeItemType::Iterator edge(node.begin());
      for (; edge != node.end(); ++edge)
      {
        deleteEdge(**edge);
        break;
      }
    }

    atom_to_node_.erase(node_it->getAtom());
    nodes_.erase(node_it);
  
    return true;
  }

  template <typename Node, typename Edge>
  bool TSimpleMolecularGraph<Node, Edge>::deleteEdge(typename TSimpleMolecularGraph<Node, Edge>::EdgeItemType& edge)
  {
    typename std::list<EdgeItemType>::iterator edge_it = std::find(edges_.begin(), edges_.end(), edge);
    if (edge_it == edges_.end())
    {
      return false;
    }
    edge.getSource().deleteEdge_(&edge);
    edge.getTarget().deleteEdge_(&edge);
    bond_to_edge_.erase(edge_it->getBond());
    edges_.erase(edge_it);
    
    return true;
  }


  template <typename Node, typename Edge>
  NodeItem<Node, Edge>::NodeItem()
    
    : atom_(0)
  {
  }

  template <typename Node, typename Edge>
  NodeItem<Node, Edge>::NodeItem(const Atom& atom)
    
    : atom_(const_cast<Atom*>(&atom))
  {
  }

  template <typename Node, typename Edge>
  Node& NodeItem<Node, Edge>::getData()
    
  {
    return data_;
  }

  template <typename Node, typename Edge>
  const Node& NodeItem<Node, Edge>::getData() const 
    
  { 
    return data_;
  }


  template <typename Node, typename Edge>
  void NodeItem<Node, Edge>::setData(const Node& data) 
    
  { 
    data_ = data; 
  }

  
  template <typename Node, typename Edge>
  const Atom* NodeItem<Node, Edge>::getAtom() const 
    
  { 
    return atom_;
  }

  template <typename Node, typename Edge>
  Atom* NodeItem<Node, Edge>::getAtom() 
    
  { 
    return atom_;
  }

  template <typename Node, typename Edge>
  typename NodeItem<Node, Edge>::Iterator NodeItem<Node, Edge>::begin() 
    
  { 
    return adjacent_edges_.begin(); 
  }
  
  template <typename Node, typename Edge>
  typename NodeItem<Node, Edge>::ConstIterator NodeItem<Node, Edge>::begin() const 
    
  { 
    return adjacent_edges_.begin(); 
  }

  template <typename Node, typename Edge>
  typename NodeItem<Node, Edge>::Iterator NodeItem<Node, Edge>::end() 
    
  { 
    return adjacent_edges_.end(); 
  }

  template <typename Node, typename Edge>
  typename NodeItem<Node, Edge>::ConstIterator NodeItem<Node, Edge>::end() const    
    
  { 
    return adjacent_edges_.end(); 
  }

  template <typename Node, typename Edge>
  Size NodeItem<Node, Edge>::getDegree() const 
    
  { 
    return (Size)adjacent_edges_.size(); 
  }

  template <typename Node, typename Edge>
  bool NodeItem<Node, Edge>::operator == (const NodeItem& item) const 
    
  { 
    return (atom_ == item.atom_); 
  }

  template <typename Node, typename Edge>
  bool NodeItem<Node, Edge>::operator != (const NodeItem& item) const 
    
  { 
    return (atom_ != item.atom_); 
  }

  template <typename Node, typename Edge>
  void NodeItem<Node, Edge>::deleteEdge_(EdgeItemType* item)
    
  {
    Iterator it(std::find(adjacent_edges_.begin(), adjacent_edges_.end(), item));
    if (it != adjacent_edges_.end())
    {
      adjacent_edges_.erase(it);
    }
  }

  template <typename Node, typename Edge>
  BALL_INLINE
  Size TSimpleMolecularGraph<Node, Edge>::getNumberOfNodes() const
    
  {
    return nodes_.size();
  }

  template <typename Node, typename Edge>
  BALL_INLINE
  Size TSimpleMolecularGraph<Node, Edge>::getNumberOfEdges() const
    
  {
    return edges_.size();
  }

  
} // namespace BALL

#endif // BALL_STRUCTURE_MOLECULARGRAPH_H