1 | /* -*- C++ -*- |
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2 | * src/lemon/map_registry.h - Part of LEMON, a generic C++ optimization library |
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3 | * |
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4 | * Copyright (C) 2004 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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5 | * (Egervary Combinatorial Optimization Research Group, EGRES). |
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6 | * |
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7 | * Permission to use, modify and distribute this software is granted |
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8 | * provided that this copyright notice appears in all copies. For |
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9 | * precise terms see the accompanying LICENSE file. |
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10 | * |
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11 | * This software is provided "AS IS" with no warranty of any kind, |
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12 | * express or implied, and with no claim as to its suitability for any |
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13 | * purpose. |
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14 | * |
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15 | */ |
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16 | |
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17 | #ifndef LEMON_MAP_REGISTRY_H |
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18 | #define LEMON_MAP_REGISTRY_H |
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19 | |
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20 | #include <vector> |
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21 | |
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22 | ///\ingroup graphmapfactory |
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23 | ///\file |
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24 | ///\brief Map registry for graph maps. |
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25 | |
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26 | using namespace std; |
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27 | |
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28 | namespace lemon { |
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29 | |
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30 | /// \addtogroup graphmapfactory |
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31 | /// @{ |
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32 | |
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33 | /** |
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34 | * Registry class to register edge or node maps into the graph. The |
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35 | * registry helps you to implement an observer pattern. If you add |
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36 | * or erase an edge or node you must notify all the maps about the |
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37 | * event. |
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38 | */ |
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39 | template <typename G, typename K, typename KIt> |
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40 | class MapRegistry { |
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41 | public: |
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42 | typedef G Graph; |
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43 | typedef K KeyType; |
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44 | typedef KIt KeyIt; |
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45 | |
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46 | /** |
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47 | * MapBase is the base class of the registered maps. |
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48 | * It defines the core modification operations on the maps and |
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49 | * implements some helper functions. |
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50 | */ |
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51 | class MapBase { |
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52 | public: |
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53 | typedef G Graph; |
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54 | typedef K KeyType; |
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55 | typedef KIt KeyIt; |
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56 | |
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57 | typedef MapRegistry<G, K, KIt> Registry; |
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58 | |
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59 | friend class MapRegistry<G, K, KIt>; |
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60 | |
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61 | /** |
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62 | * Default constructor for MapBase. |
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63 | */ |
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64 | |
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65 | MapBase() : graph(0), registry(0) {} |
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66 | |
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67 | /** |
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68 | * Simple constructor to register into a graph registry. |
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69 | */ |
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70 | |
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71 | MapBase(const Graph& g, Registry& r) : graph(&g), registry(0) { |
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72 | r.attach(*this); |
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73 | } |
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74 | |
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75 | /** |
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76 | * Copy constructor to register into the registry. |
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77 | */ |
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78 | |
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79 | MapBase(const MapBase& copy) : graph(copy.graph), registry(0) { |
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80 | if (copy.registry) { |
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81 | copy.registry->attach(*this); |
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82 | } |
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83 | } |
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84 | |
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85 | /** |
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86 | * Assign operator. |
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87 | */ |
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88 | const MapBase& operator=(const MapBase& copy) { |
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89 | if (registry) { |
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90 | registry->detach(*this); |
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91 | } |
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92 | graph = copy.graph; |
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93 | if (copy.registry) { |
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94 | copy.registry->attach(*this); |
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95 | } |
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96 | return *this; |
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97 | } |
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98 | |
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99 | |
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100 | /** |
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101 | * Destructor. |
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102 | */ |
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103 | |
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104 | virtual ~MapBase() { |
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105 | if (registry) { |
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106 | registry->detach(*this); |
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107 | } |
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108 | } |
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109 | |
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110 | /* |
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111 | * Returns the graph that the map belongs to. |
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112 | */ |
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113 | |
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114 | const Graph* getGraph() const { return graph; } |
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115 | |
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116 | protected: |
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117 | |
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118 | const Graph* graph; |
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119 | Registry* registry; |
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120 | |
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121 | int registry_index; |
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122 | |
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123 | protected: |
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124 | |
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125 | /** |
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126 | Helper function to implement constructors in the subclasses. |
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127 | */ |
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128 | |
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129 | virtual void init() { |
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130 | for (KeyIt it(*graph); it != INVALID; ++it) { |
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131 | add(it); |
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132 | } |
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133 | } |
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134 | |
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135 | /** |
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136 | Helper function to implement the destructor in the subclasses. |
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137 | */ |
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138 | |
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139 | virtual void destroy() { |
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140 | for (KeyIt it(*getGraph()); it != INVALID; ++it) { |
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141 | erase(it); |
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142 | } |
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143 | } |
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144 | |
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145 | /** |
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146 | The add member function should be overloaded in the subclasses. |
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147 | \e Add extends the map with the new node. |
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148 | */ |
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149 | |
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150 | virtual void add(const KeyType&) = 0; |
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151 | /** |
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152 | The erase member function should be overloaded in the subclasses. |
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153 | \e Erase removes the node from the map. |
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154 | */ |
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155 | |
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156 | virtual void erase(const KeyType&) = 0; |
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157 | |
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158 | /** |
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159 | * The clear member function should be overloaded in the subclasses. |
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160 | * \e Clear makes empty the data structure. |
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161 | */ |
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162 | |
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163 | virtual void clear() = 0; |
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164 | |
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165 | /** |
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166 | Exception class to throw at unsupported operation. |
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167 | */ |
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168 | |
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169 | class NotSupportedOperationException {}; |
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170 | |
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171 | }; |
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172 | |
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173 | protected: |
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174 | |
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175 | /** |
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176 | * The container type of the maps. |
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177 | */ |
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178 | typedef std::vector<MapBase*> Container; |
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179 | |
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180 | /** |
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181 | * The container of the registered maps. |
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182 | */ |
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183 | Container container; |
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184 | |
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185 | |
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186 | public: |
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187 | |
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188 | /** |
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189 | * Default Constructor of the MapRegistry. It creates an empty registry. |
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190 | */ |
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191 | MapRegistry() {} |
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192 | |
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193 | /** |
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194 | * Copy Constructor of the MapRegistry. The new registry does not steal |
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195 | * the maps from the right value. The new registry will be an empty. |
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196 | */ |
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197 | MapRegistry(const MapRegistry&) {} |
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198 | |
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199 | /** |
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200 | * Assign operator. The left value does not steal the maps |
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201 | * from the right value. The left value will be an empty registry. |
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202 | */ |
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203 | MapRegistry& operator=(const MapRegistry&) { |
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204 | typename Container::iterator it; |
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205 | for (it = container.begin(); it != container.end(); ++it) { |
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206 | (*it)->destroy(); |
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207 | (*it)->graph = 0; |
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208 | (*it)->registry = 0; |
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209 | } |
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210 | } |
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211 | |
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212 | /** |
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213 | * Destructor of the MapRegistry. |
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214 | */ |
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215 | ~MapRegistry() { |
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216 | typename Container::iterator it; |
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217 | for (it = container.begin(); it != container.end(); ++it) { |
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218 | (*it)->destroy(); |
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219 | (*it)->registry = 0; |
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220 | (*it)->graph = 0; |
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221 | } |
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222 | } |
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223 | |
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224 | |
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225 | public: |
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226 | |
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227 | /** |
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228 | * Attach a map into thr registry. If the map has been attached |
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229 | * into an other registry it is detached from that automaticly. |
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230 | */ |
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231 | void attach(MapBase& map) { |
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232 | if (map.registry) { |
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233 | map.registry->detach(map); |
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234 | } |
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235 | container.push_back(&map); |
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236 | map.registry = this; |
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237 | map.registry_index = container.size()-1; |
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238 | } |
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239 | |
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240 | /** |
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241 | * Detach the map from the registry. |
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242 | */ |
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243 | void detach(MapBase& map) { |
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244 | container.back()->registry_index = map.registry_index; |
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245 | container[map.registry_index] = container.back(); |
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246 | container.pop_back(); |
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247 | map.registry = 0; |
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248 | map.graph = 0; |
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249 | } |
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250 | |
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251 | |
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252 | /** |
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253 | * Notify all the registered maps about a Key added. |
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254 | */ |
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255 | void add(KeyType& key) { |
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256 | typename Container::iterator it; |
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257 | for (it = container.begin(); it != container.end(); ++it) { |
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258 | (*it)->add(key); |
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259 | } |
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260 | } |
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261 | |
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262 | /** |
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263 | * Notify all the registered maps about a Key erased. |
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264 | */ |
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265 | void erase(KeyType& key) { |
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266 | typename Container::iterator it; |
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267 | for (it = container.begin(); it != container.end(); ++it) { |
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268 | (*it)->erase(key); |
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269 | } |
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270 | } |
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271 | |
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272 | /** |
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273 | * Notify all the registered maps about the map should be cleared. |
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274 | */ |
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275 | void clear() { |
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276 | typename Container::iterator it; |
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277 | for (it = container.begin(); it != container.end(); ++it) { |
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278 | (*it)->clear(); |
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279 | } |
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280 | } |
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281 | }; |
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282 | |
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283 | |
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284 | /// @} |
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285 | |
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286 | |
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287 | } |
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288 | |
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289 | #endif |
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