source: lemon-0.x/lemon/bits/static_map.h @ 1990:15fb7a4ea6be

/* -*- C++ -*-
 *
 * This file is a part of LEMON, a generic C++ optimization library
 *
 * Copyright (C) 2003-2006
 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
 * (Egervary Research Group on Combinatorial Optimization, EGRES).
 *
 * Permission to use, modify and distribute this software is granted
 * provided that this copyright notice appears in all copies. For
 * precise terms see the accompanying LICENSE file.
 *
 * This software is provided "AS IS" with no warranty of any kind,
 * express or implied, and with no claim as to its suitability for any
 * purpose.
 *
 */

#ifndef LEMON_STATIC_MAP_H
#define LEMON_STATIC_MAP_H

#include <algorithm>
#include <iostream>

#include <lemon/utility.h>
#include <lemon/bits/map_extender.h>
#include <lemon/bits/alteration_notifier.h>
#include <lemon/error.h>
#include <lemon/concept_check.h>
#include <lemon/concept/maps.h>

/// \ingroup graphmaps
///
///\file
///\brief Static sized graph maps.

namespace lemon {

  /// \ingroup graphmaps
  ///
  /// \brief Graph map with static sized storage.
  ///
  /// The StaticMap template class is graph map structure what
  /// does not indate automatically the map when a key is added to or 
  /// erased from the map rather it throws an exception. This map factory 
  /// uses the allocators to implement the container functionality.
  ///
  /// \param Registry The AlterationNotifier that will notify this map.
  /// \param Item The item type of the graph items.
  /// \param Value The value type of the map.
  /// 
  /// \author Balazs Dezso
        

  template <typename _Graph, typename _Item, typename _Value>
  class StaticMap : public AlterationNotifier<_Item>::ObserverBase {
  public:

    /// \brief Exception class for unsupported exceptions.
    class UnsupportedOperation : public lemon::LogicError {
    public:
      virtual const char* exceptionName() const {
        return "lemon::StaticMap::UnsupportedOperation";
      }
    };

  private:
                
    typedef std::vector<_Value> Container;      

  public:

    /// The graph type of the map. 
    typedef _Graph Graph;
    /// The reference map tag.
    typedef True ReferenceMapTag;

    /// The key type of the map.
    typedef _Item Key;
    /// The value type of the map.
    typedef _Value Value;
    /// The const reference type of the map.
    typedef typename Container::const_reference ConstReference;
    /// The reference type of the map.
    typedef typename Container::reference Reference;

    typedef const Value ConstValue;
    typedef Value* Pointer;
    typedef const Value* ConstPointer;

    typedef AlterationNotifier<_Item> Registry;

    /// The map type.
    typedef StaticMap Map;
    /// The base class of the map.
    typedef typename Registry::ObserverBase Parent;

    /// \brief Constructor to attach the new map into the registry.
    ///
    /// It constructs a map and attachs it into the registry.
    /// It adds all the items of the graph to the map.
    StaticMap(const Graph& _g) : graph(&_g) {
      attach(_g.getNotifier(_Item()));
      build();
    }

    /// \brief Constructor uses given value to initialize the map. 
    ///
    /// It constructs a map uses a given value to initialize the map. 
    /// It adds all the items of the graph to the map.     
    StaticMap(const Graph& _g, const Value& _v) : graph(&_g) { 
      attach(_g.getNotifier(_Item()));
      unsigned size = graph->maxId(_Item()) + 1;
      container.reserve(size);
      container.resize(size, _v);
    }

    /// \brief Copy constructor
    ///
    /// Copy constructor.
    StaticMap(const StaticMap& _copy) : Parent(), graph(_copy.getGraph()) {
      if (_copy.attached()) {
        attach(*_copy.getRegistry());
        container = _copy.container;
      }
    }

    /// \brief Destrcutor
    ///
    /// Destructor.
    virtual ~StaticMap() {
      clear();
      if (attached()) {
        detach();
      }
    }


  private:

    StaticMap& operator=(const StaticMap&);

  protected:

    using Parent::attach;
    using Parent::detach;
    using Parent::attached;

    const Graph* getGraph() const {
      return graph;
    }

  public:

    /// \brief The subcript operator.
    ///
    /// The subscript operator. The map can be subscripted by the
    /// actual items of the graph. 
     
    Reference operator[](const Key& key) {
      return container[graph->id(key)];
    } 
                
    /// \brief The const subcript operator.
    ///
    /// The const subscript operator. The map can be subscripted by the
    /// actual items of the graph. 
     
    ConstReference operator[](const Key& key) const {
      return container[graph->id(key)];
    }


    /// \brief The setter function of the map.
    ///
    /// It the same as operator[](key) = value expression.
    ///
    void set(const Key& key, const Value& value) {
      (*this)[key] = value;
    }

  protected:

    /// \brief Adds a new key to the map.
    ///         
    /// It adds a new key to the map. It called by the observer registry
    /// and it overrides the add() member function of the observer base.
     
    void add(const Key&) {
      throw UnsupportedOperation();
    }

    /// \brief Erases a key from the map.
    ///
    /// Erase a key from the map. It called by the observer registry
    /// and it overrides the erase() member function of the observer base.     
    void erase(const Key&) {
      throw UnsupportedOperation();
    }

    /// Buildes the map.
                
    /// It buildes the map. It called by the observer registry
    /// and it overrides the build() member function of the observer base.

    void build() { 
      int size = graph->maxId(_Item()) + 1;
      container.reserve(size);
      container.resize(size);
    }

    /// Clear the map.

    /// It erase all items from the map. It called by the observer registry
    /// and it overrides the clear() member function of the observer base.     
    void clear() { 
      container.clear();
    }
    
  private:
                
    Container container;
    const Graph *graph;

  };

}

#endif