/* -*- C++ -*-

  * src/lemon/array_map.h - Part of LEMON, a generic C++ optimization library

  *

  * Copyright (C) 2005 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_ARRAY_MAP_H

 #define LEMON_ARRAY_MAP_H

 #include <memory>

 #include <lemon/bits/map_iterator.h>

 ///\ingroup graphmaps

 ///\file

 ///\brief Graph maps that construates and destruates

 ///their elements dynamically.

 namespace lemon {

   /// \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.

    *

    *  The template parameter is the AlterationNotifier that the maps

    *  will belong to and the Value.

    */

   template <typename _Graph, 

 	    typename _Item,

 	    typename _Value>

   class ArrayMap : public AlterationNotifier<_Item>::ObserverBase {

     typedef _Item Item;

   public:

     /// The graph type of the maps. 

     typedef _Graph Graph;

     /// The key type of the maps.

     typedef _Item Key;

     typedef AlterationNotifier<_Item> Registry;

     /// The MapBase of the Map which imlements the core regisitry function.

     typedef typename Registry::ObserverBase Parent;

     /// The value type of the map.

     typedef _Value Value;

   private:

     typedef std::allocator<Value> Allocator;

   public:

     /** Graph and Registry initialized map constructor.

      */

     ArrayMap(const Graph& _g) : graph(&_g) {

       Item it;

       attach(_g.getNotifier(Item()));

       allocate_memory();

       for (graph->first(it); it != INVALID; graph->next(it)) {

 	int id = graph->id(it);;

 	allocator.construct(&(values[id]), Value());

       }								

     }

     /// Constructor to use default value to initialize the map. 

     /// It constrates a map and initialize all of the the map. 

     ArrayMap(const Graph& _g, const Value& _v) : graph(&_g) {

       Item it;

       attach(_g.getNotifier(_Item()));

       allocate_memory();

       for (graph->first(it); it != INVALID; graph->next(it)) {

 	int id = graph->id(it);;

 	allocator.construct(&(values[id]), _v);

       }								

     }

     /** Constructor to copy a map of the same map type.

      */

     ArrayMap(const ArrayMap& copy) : Parent() {

       if (copy.attached()) {

 	attach(*copy.getRegistry());

       }

       capacity = copy.capacity;

       if (capacity == 0) return;

       values = allocator.allocate(capacity);

       Item it;

       for (graph->first(it); it != INVALID; graph->next(it)) {

 	int id = graph->id(it);;

 	allocator.construct(&(values[id]), copy.values[id]);

       }

     }

     using Parent::attach;

     using Parent::detach;

     using Parent::attached;

     /** Assign operator to copy a map of the same map type.

      */

     ArrayMap& operator=(const ArrayMap& copy) {

       if (&copy == this) return *this;

       if (graph != copy.graph) {

 	if (attached()) {

 	  clear();

 	  detach();

 	}

 	if (copy.attached()) {

 	  attach(*copy.getRegistry());

 	}

 	capacity = copy.capacity;

 	if (capacity == 0) return *this;

 	values = allocator.allocate(capacity);      

       }

       Item it;

       for (graph->first(it); it != INVALID; graph->next(it)) {

 	int id = graph->id(it);;

 	allocator.construct(&(values[id]), copy.values[id]);

       }

       return *this;

     }

     /** The destructor of the map.

      */

     virtual ~ArrayMap() {      

       if (attached()) {

 	clear();

 	detach();

       }

     }

     /**

      * The subscript operator. The map can be subscripted by the

      * actual keys of the graph. 

      */

     Value& operator[](const Key& key) {

       int id = graph->id(key);

       return values[id];

     } 

     /**

      * The const subscript operator. The map can be subscripted by the

      * actual keys of the graph. 

      */

     const Value& operator[](const Key& key) const {

       int id = graph->id(key);

       return values[id];

     }

     /** Setter function of the map. Equivalent with map[key] = val.

      *  This is a compatibility feature with the not dereferable maps.

      */

     void set(const Key& key, const Value& val) {

       (*this)[key] = val;

     }

     /** Add a new key to the map. It called by the map registry.

      */

     void add(const Key& key) {

       int id = graph->id(key);

       if (id >= capacity) {

 	int new_capacity = (capacity == 0 ? 1 : capacity);

 	while (new_capacity <= id) {

 	  new_capacity <<= 1;

 	}

 	Value* new_values = allocator.allocate(new_capacity);

 	Item it;

 	for (graph->first(it); it != INVALID; graph->next(it)) {

 	  int jd = graph->id(it);;

 	  if (id != jd) {

 	    allocator.construct(&(new_values[jd]), values[jd]);

 	    allocator.destroy(&(values[jd]));

 	  }

 	}

 	if (capacity != 0) allocator.deallocate(values, capacity);

 	values = new_values;

 	capacity = new_capacity;

       }

       allocator.construct(&(values[id]), Value());

     }

     /** Erase a key from the map. It called by the map registry.

      */

     void erase(const Key& key) {

       int id = graph->id(key);

       allocator.destroy(&(values[id]));

     }

     void build() {

       allocate_memory();

       Item it;

       for (graph->first(it); it != INVALID; graph->next(it)) {

 	int id = graph->id(it);;

 	allocator.construct(&(values[id]), Value());

       }								

     }

     void clear() {	

       if (capacity != 0) {

 	Item it;

 	for (graph->first(it); it != INVALID; graph->next(it)) {

 	  int id = graph->id(it);;

 	  allocator.destroy(&(values[id]));

 	}								

 	allocator.deallocate(values, capacity);

 	capacity = 0;

       }

     }

     const Graph* getGraph() {

       return graph;

     }

 //     /// The stl compatible pair iterator of the map.

 //     typedef MapIterator<ArrayMap> Iterator;

 //     /// The stl compatible const pair iterator of the map.

 //     typedef MapConstIterator<ArrayMap> 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);

 //     }

 //     /// The KeySet of the Map.

 //     typedef MapConstKeySet<ArrayMap> ConstKeySet;

 //     /// KeySet getter function.

 //     ConstKeySet keySet() const {

 //       return ConstKeySet(*this); 

 //     }

 //     /// The ConstValueSet of the Map.

 //     typedef MapConstValueSet<ArrayMap> ConstValueSet;

 //     /// ConstValueSet getter function.

 //     ConstValueSet valueSet() const {

 //       return ConstValueSet(*this);

 //     }

 //     /// The ValueSet of the Map.

 //     typedef MapValueSet<ArrayMap> ValueSet;

 //     /// ValueSet getter function.

 //     ValueSet valueSet() {

 //       return ValueSet(*this);

 //     }

   private:

     void allocate_memory() {

       int max_id = graph->maxId(_Item());

       if (max_id == -1) {

 	capacity = 0;

 	values = 0;

 	return;

       }

       capacity = 1;

       while (capacity <= max_id) {

 	capacity <<= 1;

       }

       values = allocator.allocate(capacity);	

     }      

     const Graph* graph;

     int capacity;

     Value* values;

     Allocator allocator;

   };		

   template <typename _Base> 

   class ArrayMappableGraphExtender : public _Base {

   public:

     typedef ArrayMappableGraphExtender<_Base> Graph;

     typedef _Base Parent;

     typedef typename Parent::Node Node;

     typedef typename Parent::NodeIt NodeIt;

     typedef typename Parent::NodeNotifier NodeObserverRegistry;

     typedef typename Parent::Edge Edge;

     typedef typename Parent::EdgeIt EdgeIt;

     typedef typename Parent::EdgeNotifier EdgeObserverRegistry;

     template <typename _Value>

     class NodeMap 

       : public IterableMapExtender<ArrayMap<Graph, Node, _Value> > {

     public:

       typedef ArrayMappableGraphExtender<_Base> Graph;

       typedef typename Graph::Node Node;

       typedef typename Graph::NodeIt NodeIt;

       typedef IterableMapExtender<ArrayMap<Graph, Node, _Value> > Parent;

       //typedef typename Parent::Graph Graph;

       typedef typename Parent::Value Value;

       NodeMap(const Graph& g) 

 	: Parent(g) {}

       NodeMap(const Graph& g, const Value& v) 

 	: Parent(g, v) {}

     };

     template <typename _Value>

     class EdgeMap 

       : public IterableMapExtender<ArrayMap<Graph, Edge, _Value> > {

     public:

       typedef ArrayMappableGraphExtender<_Base> Graph;

       typedef typename Graph::Edge Edge;

       typedef typename Graph::EdgeIt EdgeIt;

       typedef IterableMapExtender<ArrayMap<Graph, Edge, _Value> > Parent;

       //typedef typename Parent::Graph Graph;

       typedef typename Parent::Value Value;

       EdgeMap(const Graph& g) 

 	: Parent(g) {}

       EdgeMap(const Graph& g, const Value& v) 

 	: Parent(g, v) {}

     };

   };

 /// @}

 }

 #endif //LEMON_ARRAY_MAP_H