/* -*- C++ -*-

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

 *

 * Copyright (C) 2004 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport

 * (Egervary Combinatorial Optimization Research Group, 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/map_iterator.h>

#include <lemon/map_bits.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 MapRegistry that the maps

   *  will belong to and the ValueType.

   */

  template <typename MapRegistry, typename Value> 

  class ArrayMap : public MapRegistry::MapBase {

    template <typename MR, typename V> friend class ArrayMap;

  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 MapBase of the Map which imlements the core regisitry function.

    typedef typename MapRegistry::MapBase MapBase;

  public:

    /// The value type of the map.

    typedef Value ValueType;

    /// The reference type of the map;

    typedef Value& ReferenceType;

    /// The pointer type of the map;

    typedef Value* PointerType;

    /// The const value type of the map.

    typedef const Value ConstValueType;

    /// The const reference type of the map;

    typedef const Value& ConstReferenceType;

    /// The pointer type of the map;

    typedef const Value* ConstPointerType;

    typedef std::allocator<Value> Allocator;

    /** Graph and Registry initialized map constructor.

     */

    ArrayMap(const Graph& g, MapRegistry& r) : MapBase(g, r) {

      allocate_memory();

      for (KeyIt it(*MapBase::getGraph()); it != INVALID; ++it) {

	int id = KeyInfo<Graph, KeyIt>::id(*MapBase::getGraph(), it);

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

      }								

    }

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

     */

    ArrayMap(const Graph& g, MapRegistry& r, const Value& v) 

      : MapBase(g, r) {

      allocate_memory();

      for (KeyIt it(*MapBase::getGraph()); it != INVALID; ++it) {

	int id = KeyInfo<Graph, KeyIt>::id(*MapBase::getGraph(), it);

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

      }								

    }

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

     */

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

      capacity = copy.capacity;

      if (capacity == 0) return;

      values = allocator.allocate(capacity);

      for (KeyIt it(*MapBase::getGraph()); it != INVALID; ++it) {

	int id = KeyInfo<Graph, KeyIt>::id(*MapBase::getGraph(), it);

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

      }

    }

    /** Constructor to copy a map of an other map type.

     */

    template <typename TT>

    ArrayMap(const ArrayMap<MapRegistry, TT>& copy) 

      : MapBase(copy) {

      capacity = copy.capacity;

      if (capacity == 0) return;

      values = allocator.allocate(capacity);

      for (KeyIt it(*MapBase::getGraph()); it != INVALID; ++it) {

	int id = KeyInfo<Graph, KeyIt>::id(*MapBase::getGraph(), it);

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

      }

    }

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

     */

    ArrayMap& operator=(const ArrayMap& copy) {

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

      if (MapBase::getGraph() != copy.getGraph()) {

	if (capacity != 0) {

	  MapBase::destroy();

	  allocator.deallocate(values, capacity);

	}

	MapBase::operator=(copy);

	capacity = copy.capacity;

	if (capacity == 0) return *this;

	values = allocator.allocate(capacity);      

      }

      for (KeyIt it(*MapBase::getGraph()); it != INVALID; ++it) {

	int id = KeyInfo<Graph, KeyIt>::id(*MapBase::getGraph(), it);

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

      }

      return *this;

    }

    /** Assign operator to copy a map of an other map type.

     */

    template <typename TT>

    ArrayMap& operator=(const ArrayMap<MapRegistry, TT>& copy) {

      if (MapBase::getGraph() != copy.getGraph()) {

	if (capacity != 0) {

	  MapBase::destroy();

	  allocator.deallocate(values, capacity);

	}

	MapBase::operator=(copy);

	capacity = copy.capacity;

	if (capacity == 0) return *this;

	values = allocator.allocate(capacity);

      }

      for (KeyIt it(*MapBase::getGraph()); it != INVALID; ++it) {

	int id = KeyInfo<Graph, KeyIt>::id(*MapBase::getGraph(), it);

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

      }

      return *this;

    }

    /** The destructor of the map.

     */

    virtual ~ArrayMap() {

      if (capacity != 0) {

	MapBase::destroy();

	allocator.deallocate(values, capacity);

      }

    }

    /**

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

     * actual keys of the graph. 

     */

    ReferenceType operator[](const KeyType& key) {

      int id = KeyInfo<Graph, KeyIt>::id(*MapBase::getGraph(), key);

      return values[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 = KeyInfo<Graph, KeyIt>::id(*MapBase::getGraph(), 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 KeyType& key, const ValueType& val) {

      int id = KeyInfo<Graph, KeyIt>::id(*MapBase::getGraph(), key);

      values[id] = val;

    }

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

     */

    void add(const KeyType& key) {

      int id = KeyInfo<Graph, KeyIt>::id(*MapBase::getGraph(), 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);;

	for (KeyIt it(*MapBase::getGraph()); it != INVALID; ++it) {

	  int jd = KeyInfo<Graph, KeyIt>::id(*MapBase::getGraph(), 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 KeyType& key) {

      int id = KeyInfo<Graph, KeyIt>::id(*MapBase::getGraph(), key);

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

    }

    /** Clear the data structure.

     */

    void clear() {	

      if (capacity != 0) {

	MapBase::destroy();

	allocator.deallocate(values, capacity);

	capacity = 0;

      }

    }

    /// 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 = KeyInfo<Graph, KeyIt>::maxId(*MapBase::getGraph());

      if (max_id == -1) {

	capacity = 0;

	values = 0;

	return;

      }

      capacity = 1;

      while (capacity <= max_id) {

	capacity <<= 1;

      }

      values = allocator.allocate(capacity);	

    }      

    int capacity;

    Value* values;

    Allocator allocator;

  public:

    // STL  compatibility typedefs.

    typedef Iterator iterator;

    typedef ConstIterator const_iterator;

    typedef typename Iterator::PairValueType value_type;

    typedef typename Iterator::KeyType key_type;

    typedef typename Iterator::ValueType data_type;

    typedef typename Iterator::PairReferenceType reference;

    typedef typename Iterator::PairPointerType pointer;

    typedef typename ConstIterator::PairReferenceType const_reference;

    typedef typename ConstIterator::PairPointerType const_pointer;

    typedef int difference_type;		

  };		

/// @}

}

#endif //LEMON_ARRAY_MAP_H