Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
1 | <?php |
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9 | class Configuration implements ConfigurationInterface |
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10 | { |
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11 | /** |
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12 | * Stores supported database drivers. |
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13 | * |
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14 | * @var array |
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15 | */ |
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16 | private $supportedDrivers = array('orm', 'mongodb', 'propel', 'phpcr'); |
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17 | |||
18 | /** |
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19 | * If the kernel is running in debug mode. |
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20 | * |
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21 | * @var bool |
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22 | */ |
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23 | private $debug; |
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24 | |||
25 | 25 | public function __construct($debug) |
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29 | |||
30 | /** |
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31 | * Generates the configuration tree. |
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32 | * |
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33 | * @return TreeBuilder |
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34 | */ |
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35 | 25 | public function getConfigTreeBuilder() |
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64 | |||
65 | /** |
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66 | * Adds the configuration for the "clients" key. |
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67 | */ |
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68 | 25 | private function addClientsSection(ArrayNodeDefinition $rootNode) |
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69 | { |
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70 | $rootNode |
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71 | 25 | ->fixXmlConfig('client') |
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72 | 25 | ->children() |
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73 | 25 | ->arrayNode('clients') |
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74 | 25 | ->useAttributeAsKey('id') |
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75 | 25 | ->prototype('array') |
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76 | 25 | ->performNoDeepMerging() |
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77 | // BC - Renaming 'servers' node to 'connections' |
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78 | 25 | ->beforeNormalization() |
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79 | ->ifTrue(function ($v) { return isset($v['servers']); }) |
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80 | ->then(function ($v) { |
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81 | $v['connections'] = $v['servers']; |
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82 | unset($v['servers']); |
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83 | |||
84 | return $v; |
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85 | 25 | }) |
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86 | 25 | ->end() |
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87 | // Elastica names its properties with camel case, support both |
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88 | 25 | ->beforeNormalization() |
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89 | ->ifTrue(function ($v) { return isset($v['connection_strategy']); }) |
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90 | ->then(function ($v) { |
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91 | 4 | $v['connectionStrategy'] = $v['connection_strategy']; |
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92 | 4 | unset($v['connection_strategy']); |
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93 | |||
94 | 4 | return $v; |
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95 | 25 | }) |
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96 | 25 | ->end() |
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97 | // If there is no connections array key defined, assume a single connection. |
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98 | 25 | ->beforeNormalization() |
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99 | ->ifTrue(function ($v) { return is_array($v) && !array_key_exists('connections', $v); }) |
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100 | ->then(function ($v) { |
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101 | return array( |
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102 | 24 | 'connections' => array($v), |
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103 | 24 | ); |
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104 | 25 | }) |
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105 | 25 | ->end() |
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106 | 25 | ->children() |
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107 | 25 | ->arrayNode('connections') |
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108 | 25 | ->requiresAtLeastOneElement() |
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109 | 25 | ->prototype('array') |
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110 | 25 | ->fixXmlConfig('header') |
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111 | 25 | ->children() |
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112 | 25 | ->scalarNode('url') |
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113 | 25 | ->validate() |
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114 | ->ifTrue(function ($url) { return $url && substr($url, -1) !== '/'; }) |
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115 | ->then(function ($url) { return $url.'/'; }) |
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116 | 25 | ->end() |
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117 | 25 | ->end() |
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118 | 25 | ->scalarNode('host')->end() |
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119 | 25 | ->scalarNode('port')->end() |
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120 | 25 | ->scalarNode('proxy')->end() |
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121 | 25 | ->scalarNode('logger') |
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122 | 25 | ->defaultValue($this->debug ? 'fos_elastica.logger' : false) |
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123 | 25 | ->treatNullLike('fos_elastica.logger') |
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124 | 25 | ->treatTrueLike('fos_elastica.logger') |
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125 | 25 | ->end() |
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126 | 25 | ->booleanNode('compression')->defaultValue(false)->end() |
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127 | 25 | ->arrayNode('headers') |
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128 | 25 | ->useAttributeAsKey('name') |
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129 | 25 | ->prototype('scalar')->end() |
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130 | 25 | ->end() |
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131 | 25 | ->scalarNode('transport')->end() |
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132 | 25 | ->scalarNode('timeout')->end() |
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133 | 25 | ->scalarNode('retryOnConflict') |
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134 | 25 | ->defaultValue(0) |
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135 | 25 | ->end() |
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136 | 25 | ->end() |
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137 | 25 | ->end() |
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138 | 25 | ->end() |
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139 | 25 | ->scalarNode('timeout')->end() |
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140 | 25 | ->scalarNode('headers')->end() |
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141 | 25 | ->scalarNode('connectionStrategy')->defaultValue('Simple')->end() |
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142 | 25 | ->end() |
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143 | 25 | ->end() |
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144 | 25 | ->end() |
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145 | 25 | ->end() |
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146 | ; |
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147 | 25 | } |
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148 | |||
149 | /** |
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150 | * Adds the configuration for the "indexes" key. |
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151 | */ |
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152 | 25 | private function addIndexesSection(ArrayNodeDefinition $rootNode) |
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186 | |||
187 | /** |
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188 | * Returns the array node used for "types". |
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189 | */ |
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190 | 25 | protected function getTypesNode() |
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191 | { |
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192 | 25 | $builder = new TreeBuilder(); |
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193 | 25 | $node = $builder->root('types'); |
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194 | |||
195 | $node |
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196 | 25 | ->useAttributeAsKey('name') |
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197 | 25 | ->prototype('array') |
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198 | 25 | ->treatNullLike(array()) |
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199 | 25 | ->beforeNormalization() |
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200 | 25 | ->ifNull() |
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201 | 25 | ->thenEmptyArray() |
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202 | 25 | ->end() |
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203 | // BC - Renaming 'mappings' node to 'properties' |
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204 | 25 | ->beforeNormalization() |
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205 | ->ifTrue(function ($v) { return array_key_exists('mappings', $v); }) |
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206 | ->then(function ($v) { |
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207 | 13 | $v['properties'] = $v['mappings']; |
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208 | 13 | unset($v['mappings']); |
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209 | |||
210 | 13 | return $v; |
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211 | 25 | }) |
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212 | 25 | ->end() |
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213 | // BC - Support the old is_indexable_callback property |
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214 | 25 | ->beforeNormalization() |
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215 | ->ifTrue(function ($v) { |
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216 | 18 | return isset($v['persistence']) && |
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217 | 18 | isset($v['persistence']['listener']) && |
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218 | 18 | isset($v['persistence']['listener']['is_indexable_callback']); |
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219 | 25 | }) |
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220 | ->then(function ($v) { |
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221 | 5 | $callback = $v['persistence']['listener']['is_indexable_callback']; |
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222 | |||
223 | 5 | if (is_array($callback)) { |
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224 | 5 | list($class) = $callback + array(null); |
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225 | |||
226 | 5 | if ($class[0] !== '@' && is_string($class) && !class_exists($class)) { |
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227 | $callback[0] = '@'.$class; |
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228 | } |
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229 | 5 | } |
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230 | |||
231 | 5 | $v['indexable_callback'] = $callback; |
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232 | 5 | unset($v['persistence']['listener']['is_indexable_callback']); |
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233 | |||
234 | 5 | return $v; |
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235 | 25 | }) |
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236 | 25 | ->end() |
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237 | // Support multiple dynamic_template formats to match the old bundle style |
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238 | // and the way ElasticSearch expects them |
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239 | 25 | ->beforeNormalization() |
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240 | ->ifTrue(function ($v) { return isset($v['dynamic_templates']); }) |
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241 | ->then(function ($v) { |
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242 | 4 | $dt = array(); |
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243 | 4 | foreach ($v['dynamic_templates'] as $key => $type) { |
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244 | 4 | if (is_int($key)) { |
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245 | 4 | $dt[] = $type; |
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246 | 4 | } else { |
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247 | 4 | $dt[][$key] = $type; |
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248 | } |
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249 | 4 | } |
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250 | |||
251 | 4 | $v['dynamic_templates'] = $dt; |
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252 | |||
253 | 4 | return $v; |
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254 | 25 | }) |
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255 | 25 | ->end() |
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256 | 25 | ->children() |
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257 | 25 | ->booleanNode('date_detection')->end() |
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258 | 25 | ->arrayNode('dynamic_date_formats')->prototype('scalar')->end()->end() |
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259 | 25 | ->scalarNode('index_analyzer')->end() |
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260 | 25 | ->booleanNode('numeric_detection')->end() |
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261 | 25 | ->scalarNode('search_analyzer')->end() |
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262 | 25 | ->scalarNode('dynamic')->end() |
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263 | 25 | ->variableNode('indexable_callback')->end() |
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264 | 25 | ->append($this->getPersistenceNode()) |
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265 | 25 | ->append($this->getSerializerNode()) |
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266 | 25 | ->end() |
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267 | 25 | ->append($this->getIdNode()) |
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268 | 25 | ->append($this->getPropertiesNode()) |
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269 | 25 | ->append($this->getDynamicTemplateNode()) |
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270 | 25 | ->append($this->getSourceNode()) |
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271 | 25 | ->append($this->getBoostNode()) |
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272 | 25 | ->append($this->getRoutingNode()) |
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273 | 25 | ->append($this->getParentNode()) |
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274 | 25 | ->append($this->getAllNode()) |
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275 | 25 | ->append($this->getTimestampNode()) |
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276 | 25 | ->append($this->getTtlNode()) |
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277 | 25 | ->end() |
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278 | ; |
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279 | |||
280 | 25 | return $node; |
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281 | } |
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282 | |||
283 | /** |
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284 | * Returns the array node used for "properties". |
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285 | */ |
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286 | 25 | protected function getPropertiesNode() |
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298 | |||
299 | /** |
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300 | * Returns the array node used for "dynamic_templates". |
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301 | */ |
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302 | 25 | public function getDynamicTemplateNode() |
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329 | |||
330 | /** |
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331 | * Returns the array node used for "_id". |
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332 | */ |
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333 | 25 | View Code Duplication | protected function getIdNode() |
346 | |||
347 | /** |
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348 | * Returns the array node used for "_source". |
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349 | */ |
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350 | 25 | protected function getSourceNode() |
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373 | |||
374 | /** |
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375 | * Returns the array node used for "_boost". |
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376 | */ |
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377 | 25 | protected function getBoostNode() |
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391 | |||
392 | /** |
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393 | * Returns the array node used for "_routing". |
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394 | */ |
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395 | 25 | View Code Duplication | protected function getRoutingNode() |
409 | |||
410 | /** |
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411 | * Returns the array node used for "_parent". |
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412 | */ |
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413 | 25 | protected function getParentNode() |
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428 | |||
429 | /** |
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430 | * Returns the array node used for "_all". |
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431 | */ |
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432 | 25 | protected function getAllNode() |
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447 | |||
448 | /** |
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449 | * Returns the array node used for "_timestamp". |
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450 | */ |
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451 | 25 | View Code Duplication | protected function getTimestampNode() |
468 | |||
469 | /** |
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470 | * Returns the array node used for "_ttl". |
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471 | */ |
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472 | 25 | View Code Duplication | protected function getTtlNode() |
488 | |||
489 | /** |
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490 | * @return ArrayNodeDefinition|\Symfony\Component\Config\Definition\Builder\NodeDefinition |
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491 | */ |
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492 | 25 | protected function getPersistenceNode() |
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584 | |||
585 | /** |
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586 | * @return ArrayNodeDefinition|\Symfony\Component\Config\Definition\Builder\NodeDefinition |
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587 | */ |
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588 | 25 | protected function getSerializerNode() |
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608 | } |
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609 |
Let’s take a look at an example:
In the above example, the authenticate() method works fine as long as you just pass instances of MyUser. However, if you now also want to pass a different sub-classes of User which does not have a getDisplayName() method, the code will break.
Available Fixes
Change the type-hint for the parameter:
Add an additional type-check:
Add the method to the parent class: