lemon/bits/array_map.h
author Alpar Juttner <alpar@cs.elte.hu>
Wed, 01 Oct 2008 12:26:45 +0200
changeset 292 e7af73f1805e
parent 209 765619b7cbb2
child 314 2cc60866a0c9
permissions -rw-r--r--
Merge
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/* -*- mode: C++; indent-tabs-mode: nil; -*-
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 *
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 * This file is a part of LEMON, a generic C++ optimization library.
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 *
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 * Copyright (C) 2003-2008
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 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
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 * (Egervary Research Group on Combinatorial Optimization, EGRES).
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 *
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 * Permission to use, modify and distribute this software is granted
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 * provided that this copyright notice appears in all copies. For
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 * precise terms see the accompanying LICENSE file.
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 *
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 * This software is provided "AS IS" with no warranty of any kind,
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 * express or implied, and with no claim as to its suitability for any
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 * purpose.
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 *
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 */
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#ifndef LEMON_BITS_ARRAY_MAP_H
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#define LEMON_BITS_ARRAY_MAP_H
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#include <memory>
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#include <lemon/bits/traits.h>
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#include <lemon/bits/alteration_notifier.h>
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#include <lemon/concept_check.h>
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#include <lemon/concepts/maps.h>
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/// \ingroup graphbits
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/// \file
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/// \brief Graph map based on the array storage.
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namespace lemon {
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  /// \ingroup graphbits
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  ///
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  /// \brief Graph map based on the array storage.
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  ///
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  /// The ArrayMap template class is graph map structure what
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  /// automatically updates the map when a key is added to or erased from
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  /// the map. This map uses the allocators to implement
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  /// the container functionality.
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  ///
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  /// The template parameters are the Graph the current Item type and
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  /// the Value type of the map.
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  template <typename _Graph, typename _Item, typename _Value>
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  class ArrayMap
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    : public ItemSetTraits<_Graph, _Item>::ItemNotifier::ObserverBase {
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  public:
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    /// The graph type of the maps.
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    typedef _Graph Graph;
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    /// The item type of the map.
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    typedef _Item Item;
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    /// The reference map tag.
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    typedef True ReferenceMapTag;
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    /// The key type of the maps.
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    typedef _Item Key;
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    /// The value type of the map.
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    typedef _Value Value;
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    /// The const reference type of the map.
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    typedef const _Value& ConstReference;
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    /// The reference type of the map.
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    typedef _Value& Reference;
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    /// The notifier type.
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    typedef typename ItemSetTraits<_Graph, _Item>::ItemNotifier Notifier;
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    /// The MapBase of the Map which imlements the core regisitry function.
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    typedef typename Notifier::ObserverBase Parent;
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  private:
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    typedef std::allocator<Value> Allocator;
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  public:
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    /// \brief Graph initialized map constructor.
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    ///
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    /// Graph initialized map constructor.
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    explicit ArrayMap(const Graph& graph) {
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      Parent::attach(graph.notifier(Item()));
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      allocate_memory();
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      Notifier* nf = Parent::notifier();
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      Item it;
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      for (nf->first(it); it != INVALID; nf->next(it)) {
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        int id = nf->id(it);;
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        allocator.construct(&(values[id]), Value());
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      }
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    }
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    /// \brief Constructor to use default value to initialize the map.
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    ///
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    /// It constructs a map and initialize all of the the map.
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    ArrayMap(const Graph& graph, const Value& value) {
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      Parent::attach(graph.notifier(Item()));
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      allocate_memory();
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      Notifier* nf = Parent::notifier();
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      Item it;
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      for (nf->first(it); it != INVALID; nf->next(it)) {
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        int id = nf->id(it);;
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        allocator.construct(&(values[id]), value);
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      }
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    }
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  private:
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    /// \brief Constructor to copy a map of the same map type.
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    ///
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    /// Constructor to copy a map of the same map type.
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    ArrayMap(const ArrayMap& copy) : Parent() {
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      if (copy.attached()) {
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        attach(*copy.notifier());
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      }
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      capacity = copy.capacity;
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      if (capacity == 0) return;
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      values = allocator.allocate(capacity);
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      Notifier* nf = Parent::notifier();
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      Item it;
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      for (nf->first(it); it != INVALID; nf->next(it)) {
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        int id = nf->id(it);;
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        allocator.construct(&(values[id]), copy.values[id]);
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      }
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    }
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    /// \brief Assign operator.
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    ///
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    /// This operator assigns for each item in the map the
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    /// value mapped to the same item in the copied map.
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    /// The parameter map should be indiced with the same
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    /// itemset because this assign operator does not change
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    /// the container of the map.
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    ArrayMap& operator=(const ArrayMap& cmap) {
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      return operator=<ArrayMap>(cmap);
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    }
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    /// \brief Template assign operator.
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    ///
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    /// The given parameter should be conform to the ReadMap
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    /// concecpt and could be indiced by the current item set of
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    /// the NodeMap. In this case the value for each item
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    /// is assigned by the value of the given ReadMap.
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    template <typename CMap>
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    ArrayMap& operator=(const CMap& cmap) {
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      checkConcept<concepts::ReadMap<Key, _Value>, CMap>();
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      const typename Parent::Notifier* nf = Parent::notifier();
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      Item it;
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      for (nf->first(it); it != INVALID; nf->next(it)) {
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        set(it, cmap[it]);
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      }
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      return *this;
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    }
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  public:
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    /// \brief The destructor of the map.
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    ///
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    /// The destructor of the map.
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    virtual ~ArrayMap() {
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      if (attached()) {
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        clear();
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        detach();
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      }
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    }
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  protected:
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    using Parent::attach;
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    using Parent::detach;
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    using Parent::attached;
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  public:
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    /// \brief The subscript operator.
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    ///
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    /// The subscript operator. The map can be subscripted by the
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    /// actual keys of the graph.
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    Value& operator[](const Key& key) {
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      int id = Parent::notifier()->id(key);
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      return values[id];
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    }
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    /// \brief The const subscript operator.
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    ///
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    /// The const subscript operator. The map can be subscripted by the
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    /// actual keys of the graph.
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    const Value& operator[](const Key& key) const {
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      int id = Parent::notifier()->id(key);
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      return values[id];
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    }
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    /// \brief Setter function of the map.
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    ///
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    /// Setter function of the map. Equivalent with map[key] = val.
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    /// This is a compatibility feature with the not dereferable maps.
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    void set(const Key& key, const Value& val) {
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      (*this)[key] = val;
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    }
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  protected:
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    /// \brief Adds a new key to the map.
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    ///
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    /// It adds a new key to the map. It called by the observer notifier
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    /// and it overrides the add() member function of the observer base.
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    virtual void add(const Key& key) {
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      Notifier* nf = Parent::notifier();
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      int id = nf->id(key);
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      if (id >= capacity) {
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        int new_capacity = (capacity == 0 ? 1 : capacity);
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        while (new_capacity <= id) {
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          new_capacity <<= 1;
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        }
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        Value* new_values = allocator.allocate(new_capacity);
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        Item it;
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        for (nf->first(it); it != INVALID; nf->next(it)) {
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          int jd = nf->id(it);;
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          if (id != jd) {
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            allocator.construct(&(new_values[jd]), values[jd]);
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            allocator.destroy(&(values[jd]));
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          }
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        }
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        if (capacity != 0) allocator.deallocate(values, capacity);
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        values = new_values;
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        capacity = new_capacity;
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      }
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      allocator.construct(&(values[id]), Value());
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    }
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    /// \brief Adds more new keys to the map.
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    ///
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    /// It adds more new keys to the map. It called by the observer notifier
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    /// and it overrides the add() member function of the observer base.
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    virtual void add(const std::vector<Key>& keys) {
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      Notifier* nf = Parent::notifier();
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      int max_id = -1;
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      for (int i = 0; i < int(keys.size()); ++i) {
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        int id = nf->id(keys[i]);
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        if (id > max_id) {
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          max_id = id;
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        }
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      }
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      if (max_id >= capacity) {
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        int new_capacity = (capacity == 0 ? 1 : capacity);
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        while (new_capacity <= max_id) {
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          new_capacity <<= 1;
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        }
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        Value* new_values = allocator.allocate(new_capacity);
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        Item it;
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        for (nf->first(it); it != INVALID; nf->next(it)) {
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          int id = nf->id(it);
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          bool found = false;
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          for (int i = 0; i < int(keys.size()); ++i) {
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            int jd = nf->id(keys[i]);
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            if (id == jd) {
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              found = true;
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              break;
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            }
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          }
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          if (found) continue;
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          allocator.construct(&(new_values[id]), values[id]);
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          allocator.destroy(&(values[id]));
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        }
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        if (capacity != 0) allocator.deallocate(values, capacity);
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        values = new_values;
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        capacity = new_capacity;
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      }
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      for (int i = 0; i < int(keys.size()); ++i) {
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        int id = nf->id(keys[i]);
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        allocator.construct(&(values[id]), Value());
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      }
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    }
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    /// \brief Erase a key from the map.
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    ///
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    /// Erase a key from the map. It called by the observer notifier
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    /// and it overrides the erase() member function of the observer base.
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    virtual void erase(const Key& key) {
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      int id = Parent::notifier()->id(key);
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      allocator.destroy(&(values[id]));
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    }
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    /// \brief Erase more keys from the map.
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    ///
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    /// Erase more keys from the map. It called by the observer notifier
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    /// and it overrides the erase() member function of the observer base.
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    virtual void erase(const std::vector<Key>& keys) {
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      for (int i = 0; i < int(keys.size()); ++i) {
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        int id = Parent::notifier()->id(keys[i]);
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        allocator.destroy(&(values[id]));
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      }
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    }
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    /// \brief Buildes the map.
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    ///
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    /// It buildes the map. It called by the observer notifier
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    /// and it overrides the build() member function of the observer base.
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    virtual void build() {
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      Notifier* nf = Parent::notifier();
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      allocate_memory();
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      Item it;
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      for (nf->first(it); it != INVALID; nf->next(it)) {
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        int id = nf->id(it);;
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        allocator.construct(&(values[id]), Value());
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      }
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    }
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    /// \brief Clear the map.
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    ///
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    /// It erase all items from the map. It called by the observer notifier
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    /// and it overrides the clear() member function of the observer base.
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    virtual void clear() {
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      Notifier* nf = Parent::notifier();
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      if (capacity != 0) {
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        Item it;
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        for (nf->first(it); it != INVALID; nf->next(it)) {
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          int id = nf->id(it);
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          allocator.destroy(&(values[id]));
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        }
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        allocator.deallocate(values, capacity);
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        capacity = 0;
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      }
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    }
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  private:
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    void allocate_memory() {
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      int max_id = Parent::notifier()->maxId();
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      if (max_id == -1) {
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        capacity = 0;
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        values = 0;
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        return;
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      }
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      capacity = 1;
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      while (capacity <= max_id) {
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        capacity <<= 1;
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      }
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      values = allocator.allocate(capacity);
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    }
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    int capacity;
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    Value* values;
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    Allocator allocator;
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  };
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}
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#endif