source: lemon-0.x/src/hugo/vector_map.h @ 822:88226d9fe821

// -*- c++ -*-
#ifndef VECTOR_MAP_H
#define VECTOR_MAP_H

#include <vector>

#include <hugo/map_iterator.h>

///\ingroup graphmaps
///\file
///\brief Vector based graph maps.

namespace hugo {
  
  /// \addtogroup graphmaps
  /// @{
  
  /** The ArrayMap template class is graph map structure what
   *  automatically updates the map when a key is added to or erased from
   *  the map. This map factory uses the allocators to implement 
   *  the container functionality. This map factory
   *  uses the std::vector to implement the container function.
   *
   *  The template parameter is the MapRegistry that the maps
   *  will belong to and the ValueType.
   * 
   * \todo It should use a faster initialization using the maxNodeId() or
   * maxEdgeId() function of the graph instead of iterating through each
   * edge/node.
   */
        
  template <typename MapRegistry, typename Value>
  class VectorMap : public MapRegistry::MapBase {
  public:
                
    /// The graph type of the maps. 
    typedef typename MapRegistry::Graph Graph;
    /// The key type of the maps.
    typedef typename MapRegistry::KeyType KeyType;
    /// The iterator to iterate on the keys.
    typedef typename MapRegistry::KeyIt KeyIt;

    /// The map type.
    typedef VectorMap Map;
    /// The MapBase of the Map which implements the core regisitry function.
    typedef typename MapRegistry::MapBase MapBase;

  private:
                
    /// The container type of the map.
    typedef std::vector<Value> Container;       

  public:


    /// The value type of the map.
    typedef Value ValueType;
    /// The reference type of the map;
    typedef typename Container::reference ReferenceType;
    /// The pointer type of the map;
    typedef typename Container::pointer PointerType;

    /// The const value type of the map.
    typedef const Value ConstValueType;
    /// The const reference type of the map;
    typedef typename Container::const_reference ConstReferenceType;
    /// The pointer type of the map;
    typedef typename Container::const_pointer ConstPointerType;

    /** Default constructor for the map.
     */
    VectorMap() {}
                
    /** Graph and Registry initialized map constructor.
     */
    VectorMap(const Graph& g, MapRegistry& r) : MapBase(g, r) {
      init();
    }

    /** Constructor to use default value to initialize the map. 
     */
    VectorMap(const Graph& g, MapRegistry& r, const Value& v) 
      : MapBase(g, r) {
      for (KeyIt it(*getGraph()); it != INVALID; ++it) {
        int id = getGraph()->id(it);
        if (id >= (int)container.size()) {
          container.resize(id + 1);
        }
        set(it, v);
      }
    }

    /** Constructor to copy a map of an other map type.
     */
    template <typename CMap> VectorMap(const CMap& copy) : MapBase(copy) {
      if (getGraph()) {
        for (KeyIt it(*getGraph()); it != INVALID; ++it) {
          int id = getGraph()->id(it);
          if (id >= (int)container.size()) {
            container.resize(id + 1);
          }
          set(it, copy[it]);
        }
      }
    }

    /** Assign operator to copy a map an other map type.
     */
    template <typename CMap> VectorMap& operator=(const CMap& copy) {
      if (getGraph()) {
        destroy();
      } 
      this->MapBase::operator=(copy);
      if (getGraph()) {
        for (KeyIt it(*getGraph()); it != INVALID; ++it) {
          int id = getGraph()->id(it);
          if (id >= (int)container.size()) {
            container.resize(id + 1);
          }
          set(it, copy[it]);
        }
      }
      return *this;
    }

    /** The destructor of the map.
     */
    virtual ~VectorMap() {
    }
                
    /**
     * The subscript operator. The map can be subscripted by the
     * actual keys of the graph. 
     */
    ReferenceType operator[](const KeyType& key) {
      int id = getGraph()->id(key);
      return container[id];
    } 
                
    /**
     * The const subscript operator. The map can be subscripted by the
     * actual keys of the graph. 
     */
    ConstReferenceType operator[](const KeyType& key) const {
      int id = getGraph()->id(key);
      return container[id];
    }

    /** Setter function of the map. Equivalent with map[key] = val.
     *  This is a compatibility feature with the not dereferable maps.
     */
    void set(const KeyType& key, const ValueType& val) {
      int id = getGraph()->id(key);
      container[id] = val;
    }
                
    /** Add a new key to the map. It called by the map registry.
     */
    void add(const KeyType& key) {
      int id = getGraph()->id(key);
      if (id >= (int)container.size()) {
        container.resize(id + 1);
      }
    }
                
    /** Erase a key from the map. It called by the map registry.
     */
    void erase(const KeyType& key) {}

    /** Clear the data structure.
     */
    void clear() { 
      container.clear();
    }

    /// The stl compatible pair iterator of the map.
    typedef MapIterator<VectorMap> Iterator;
    /// The stl compatible const pair iterator of the map.
    typedef MapConstIterator<VectorMap> ConstIterator;

    /** Returns the begin iterator of the map.
     */
    Iterator begin() {
      return Iterator(*this, KeyIt(*MapBase::getGraph()));
    }

    /** Returns the end iterator of the map.
     */
    Iterator end() {
      return Iterator(*this, INVALID);
    }

    /** Returns the begin ConstIterator of the map.
     */
    ConstIterator begin() const {
      return ConstIterator(*this, KeyIt(*MapBase::getGraph()));
    }

    /** Returns the end const_iterator of the map.
     */
    ConstIterator end() const {
      return ConstIterator(*this, INVALID);
    }

  private:
                
    Container container;

                
  };
  
  /// @}
  
}

#endif