Mercurial > fife-parpg

annotate engine/core/util/resource/resource_ptr.h @ 404:0ef7b088b3f8

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*Editor plugin removed from trunk because it belongs to the light branch
author helios2000@33b003aa-7bff-0310-803a-e67f0ece8222
date Fri, 29 Jan 2010 14:31:47 +0000
parents 6e7d228def30
children
rev   line source
150
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1 /***************************************************************************
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2 * Copyright (C) 2005-2008 by the FIFE team *
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3 * http://www.fifengine.de *
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4 * This file is part of FIFE. *
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5 * *
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6 * FIFE is free software; you can redistribute it and/or *
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7 * modify it under the terms of the GNU Lesser General Public *
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8 * License as published by the Free Software Foundation; either *
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9 * version 2.1 of the License, or (at your option) any later version. *
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10 * *
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11 * This library is distributed in the hope that it will be useful, *
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
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14 * Lesser General Public License for more details. *
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15 * *
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16 * You should have received a copy of the GNU Lesser General Public *
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17 * License along with this library; if not, write to the *
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18 * Free Software Foundation, Inc., *
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19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA *
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20 ***************************************************************************/
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21
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22 #ifndef FIFE_RESOURE_PTR_H
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23 #define FIFE_RESOURE_PTR_H
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24
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25 // Standard C++ library includes
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26
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27 // 3rd party library includes
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28
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29 // FIFE includes
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30 // These includes are split up in two parts, separated by one empty line
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31 // First block: files included from the FIFE root src directory
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32 // Second block: files included from the same folder
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33 #include "resource.h"
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34 #include "pool.h"
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35
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36 namespace FIFE {
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37
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38 /** A lazy loading resource.
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39 */
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40 class ResourcePtr {
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41 public:
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42 ResourcePtr(IResource* ptr = 0) : m_ptr(ptr),m_pool(0),m_index(Pool::INVALID_ID) {
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43 if( m_ptr )
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44 m_ptr->addRef();
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45 }
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46
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47 ResourcePtr(Pool* pool,int index) : m_ptr(0),m_pool(pool),m_index(index) {
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48 }
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49
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50 ResourcePtr(const ResourcePtr& r)
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51 : m_ptr(r.m_ptr),m_pool(r.m_pool),m_index(r.m_index) {
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52 if(m_ptr) {
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53 m_ptr->addRef();
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54 }
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55 }
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56
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57 ResourcePtr& operator=(const ResourcePtr& r) {
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58 if( this == &r )
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59 return *this;
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60 release();
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61 m_ptr = r.m_ptr;
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62 m_pool = r.m_pool;
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63 m_index = r.m_index;
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64 if(m_ptr) {
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65 m_ptr->addRef();
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66 }
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67 return *this;
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68 }
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69
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70 ~ResourcePtr() {
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71 release();
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72 }
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73
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74 IResource& operator->() {
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75 load();
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76 return *m_ptr;
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77 }
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78
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79 const IResource& operator->() const {
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80 constLoad();
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81 return *m_ptr;
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82 }
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83
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84 operator bool() const {
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85 return isValid();
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86 }
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87
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88 bool isValid() const {
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89 return m_ptr || isLoadable();
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90 }
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91
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92 bool isLoadable() const {
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93 return m_pool && m_index != Pool::INVALID_ID;
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94 }
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95
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96 bool operator==(const ResourcePtr& r) const {
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97 if( isLoadable() && r.isLoadable() )
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98 return m_index == r.m_index && m_pool == r.m_pool;
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99 if( !isLoadable() && !r.isLoadable() )
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100 return m_ptr == r.m_ptr;
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101 return false;
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102 }
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103
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104 bool operator<(const ResourcePtr& r) const {
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105 if( isLoadable() && r.isLoadable() )
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106 {
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107 if( m_pool == r.m_pool )
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108 return m_index < r.m_index;
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109 return m_pool < r.m_pool;
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110 }
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111 if( !isLoadable() && !r.isLoadable() )
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112 return m_ptr < r.m_ptr;
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113 return isLoadable() < r.isLoadable();
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114 }
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115
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116 void release() {
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117 if(m_ptr) {
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118 m_ptr->decRef();
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119 }
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120 m_ptr = 0;
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121 }
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122
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123 void load() {
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124 constLoad();
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125 }
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126
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127 void unload() {
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128 release();
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129 if( isLoadable() ) {
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130 m_pool->release(m_index);
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131 }
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132 }
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133
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phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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134 template<class T>
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phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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135 T* get() {
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phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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136 if( isValid() )
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phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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137 load();
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phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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138 return dynamic_cast<T*>(m_ptr);
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phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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139 }
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phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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140
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phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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141 private:
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phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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142 void constLoad() const {
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phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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143 if( m_ptr )
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phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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144 return;
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phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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145 m_ptr = &m_pool->get(m_index);
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phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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146 m_ptr->addRef();
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phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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147 }
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phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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148 mutable IResource* m_ptr;
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phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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149 Pool* m_pool;
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phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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150 int m_index;
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phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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151 };
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phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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152 }
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phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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153 #endif
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phoku@33b003aa-7bff-0310-803a-e67f0ece8222
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154