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 $debug; |
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24 | |||
25 | 26 | public function __construct($debug) |
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26 | { |
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27 | 26 | $this->debug = $debug; |
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28 | 26 | } |
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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 | 26 | public function getConfigTreeBuilder() |
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36 | { |
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37 | 26 | $treeBuilder = new TreeBuilder(); |
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38 | 26 | $rootNode = $treeBuilder->root('fos_elastica', 'array'); |
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39 | |||
40 | 26 | $this->addClientsSection($rootNode); |
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41 | 26 | $this->addIndexesSection($rootNode); |
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42 | |||
43 | $rootNode |
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44 | 26 | ->children() |
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45 | 26 | ->scalarNode('default_client') |
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46 | 26 | ->info('Defaults to the first client defined') |
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47 | 26 | ->end() |
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48 | 26 | ->scalarNode('default_index') |
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49 | 26 | ->info('Defaults to the first index defined') |
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50 | 26 | ->end() |
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51 | 26 | ->scalarNode('default_manager')->defaultValue('orm')->end() |
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52 | 26 | ->arrayNode('serializer') |
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53 | 26 | ->treatNullLike(array()) |
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54 | 26 | ->children() |
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55 | 26 | ->scalarNode('callback_class')->defaultValue('FOS\ElasticaBundle\Serializer\Callback')->end() |
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56 | 26 | ->scalarNode('serializer')->defaultValue('serializer')->end() |
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57 | 26 | ->end() |
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58 | 26 | ->end() |
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59 | 26 | ->end() |
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60 | ; |
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61 | |||
62 | 26 | return $treeBuilder; |
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63 | } |
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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 | 26 | private function addClientsSection(ArrayNodeDefinition $rootNode) |
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150 | |||
151 | /** |
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152 | * Adds the configuration for the "indexes" key. |
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153 | */ |
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154 | 26 | private function addIndexesSection(ArrayNodeDefinition $rootNode) |
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155 | { |
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156 | $rootNode |
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157 | 26 | ->fixXmlConfig('index') |
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158 | 26 | ->children() |
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159 | 26 | ->arrayNode('indexes') |
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160 | 26 | ->useAttributeAsKey('name') |
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161 | 26 | ->prototype('array') |
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162 | 26 | ->children() |
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163 | 26 | ->scalarNode('index_name') |
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164 | 26 | ->info('Defaults to the name of the index, but can be modified if the index name is different in ElasticSearch') |
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165 | 26 | ->end() |
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166 | 26 | ->booleanNode('use_alias')->defaultValue(false)->end() |
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167 | 26 | ->scalarNode('client')->end() |
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168 | 26 | ->scalarNode('finder') |
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169 | 26 | ->treatNullLike(true) |
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170 | 26 | ->defaultFalse() |
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171 | 26 | ->end() |
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172 | 26 | ->arrayNode('type_prototype') |
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173 | 26 | ->children() |
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174 | 26 | ->scalarNode('index_analyzer')->end() |
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175 | 26 | ->scalarNode('search_analyzer')->end() |
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176 | 26 | ->append($this->getPersistenceNode()) |
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177 | 26 | ->append($this->getSerializerNode()) |
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178 | 26 | ->end() |
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179 | 26 | ->end() |
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180 | 26 | ->variableNode('settings')->defaultValue(array())->end() |
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181 | 26 | ->end() |
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182 | 26 | ->append($this->getTypesNode()) |
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183 | 26 | ->end() |
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184 | 26 | ->end() |
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185 | 26 | ->end() |
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186 | ; |
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187 | 26 | } |
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188 | |||
189 | /** |
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190 | * Returns the array node used for "types". |
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191 | */ |
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192 | 26 | protected function getTypesNode() |
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284 | |||
285 | /** |
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286 | * Returns the array node used for "properties". |
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287 | */ |
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288 | 26 | protected function getPropertiesNode() |
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289 | { |
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290 | 26 | $builder = new TreeBuilder(); |
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291 | 26 | $node = $builder->root('properties'); |
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292 | |||
293 | $node |
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294 | 26 | ->useAttributeAsKey('name') |
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295 | 26 | ->prototype('variable') |
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296 | 26 | ->treatNullLike(array()); |
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297 | |||
298 | 26 | return $node; |
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299 | } |
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300 | |||
301 | /** |
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302 | * Returns the array node used for "dynamic_templates". |
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303 | */ |
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304 | 26 | public function getDynamicTemplateNode() |
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305 | { |
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306 | 26 | $builder = new TreeBuilder(); |
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307 | 26 | $node = $builder->root('dynamic_templates'); |
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308 | |||
309 | $node |
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310 | 26 | ->prototype('array') |
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311 | 26 | ->prototype('array') |
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312 | 26 | ->children() |
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313 | 26 | ->scalarNode('match')->end() |
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314 | 26 | ->scalarNode('unmatch')->end() |
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315 | 26 | ->scalarNode('match_mapping_type')->end() |
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316 | 26 | ->scalarNode('path_match')->end() |
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317 | 26 | ->scalarNode('path_unmatch')->end() |
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318 | 26 | ->scalarNode('match_pattern')->end() |
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319 | 26 | ->arrayNode('mapping') |
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320 | 26 | ->prototype('variable') |
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321 | 26 | ->treatNullLike(array()) |
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322 | 26 | ->end() |
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323 | 26 | ->end() |
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324 | 26 | ->end() |
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325 | 26 | ->end() |
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326 | 26 | ->end() |
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327 | ; |
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328 | |||
329 | 26 | return $node; |
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330 | } |
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331 | |||
332 | /** |
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333 | * Returns the array node used for "_id". |
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334 | */ |
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335 | 26 | View Code Duplication | protected function getIdNode() |
336 | { |
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337 | 26 | $builder = new TreeBuilder(); |
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338 | 26 | $node = $builder->root('_id'); |
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339 | |||
340 | $node |
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341 | 26 | ->children() |
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342 | 26 | ->scalarNode('path')->end() |
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343 | 26 | ->end() |
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344 | ; |
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345 | |||
346 | 26 | return $node; |
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347 | } |
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348 | |||
349 | /** |
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350 | * Returns the array node used for "_source". |
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351 | */ |
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352 | 26 | protected function getSourceNode() |
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353 | { |
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354 | 26 | $builder = new TreeBuilder(); |
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355 | 26 | $node = $builder->root('_source'); |
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356 | |||
357 | $node |
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358 | 26 | ->children() |
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359 | 26 | ->arrayNode('excludes') |
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360 | 26 | ->useAttributeAsKey('name') |
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361 | 26 | ->prototype('scalar')->end() |
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362 | 26 | ->end() |
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363 | 26 | ->arrayNode('includes') |
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364 | 26 | ->useAttributeAsKey('name') |
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365 | 26 | ->prototype('scalar')->end() |
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366 | 26 | ->end() |
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367 | 26 | ->scalarNode('compress')->end() |
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368 | 26 | ->scalarNode('compress_threshold')->end() |
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369 | 26 | ->scalarNode('enabled')->defaultTrue()->end() |
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370 | 26 | ->end() |
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371 | ; |
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372 | |||
373 | 26 | return $node; |
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374 | } |
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375 | |||
376 | /** |
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377 | * Returns the array node used for "_boost". |
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378 | */ |
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379 | 26 | protected function getBoostNode() |
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380 | { |
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381 | 26 | $builder = new TreeBuilder(); |
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382 | 26 | $node = $builder->root('_boost'); |
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383 | |||
384 | $node |
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385 | 26 | ->children() |
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386 | 26 | ->scalarNode('name')->end() |
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387 | 26 | ->scalarNode('null_value')->end() |
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388 | 26 | ->end() |
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389 | ; |
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390 | |||
391 | 26 | return $node; |
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392 | } |
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393 | |||
394 | /** |
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395 | * Returns the array node used for "_routing". |
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396 | */ |
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397 | 26 | View Code Duplication | protected function getRoutingNode() |
398 | { |
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399 | 26 | $builder = new TreeBuilder(); |
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400 | 26 | $node = $builder->root('_routing'); |
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401 | |||
402 | $node |
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403 | 26 | ->children() |
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404 | 26 | ->scalarNode('required')->end() |
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405 | 26 | ->scalarNode('path')->end() |
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406 | 26 | ->end() |
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407 | ; |
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408 | |||
409 | 26 | return $node; |
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410 | } |
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411 | |||
412 | /** |
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413 | * Returns the array node used for "_parent". |
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414 | */ |
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415 | 26 | protected function getParentNode() |
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416 | { |
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417 | 26 | $builder = new TreeBuilder(); |
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418 | 26 | $node = $builder->root('_parent'); |
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419 | |||
420 | $node |
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421 | 26 | ->children() |
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422 | 26 | ->scalarNode('type')->end() |
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423 | 26 | ->scalarNode('property')->defaultValue(null)->end() |
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424 | 26 | ->scalarNode('identifier')->defaultValue('id')->end() |
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425 | 26 | ->end() |
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426 | ; |
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427 | |||
428 | 26 | return $node; |
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429 | } |
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430 | |||
431 | /** |
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432 | * Returns the array node used for "_all". |
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433 | */ |
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434 | 26 | protected function getAllNode() |
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435 | { |
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436 | 26 | $builder = new TreeBuilder(); |
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437 | 26 | $node = $builder->root('_all'); |
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438 | |||
439 | $node |
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440 | 26 | ->children() |
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441 | 26 | ->scalarNode('enabled')->defaultValue(true)->end() |
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442 | 26 | ->scalarNode('index_analyzer')->end() |
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443 | 26 | ->scalarNode('search_analyzer')->end() |
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444 | 26 | ->end() |
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445 | ; |
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446 | |||
447 | 26 | return $node; |
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448 | } |
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449 | |||
450 | /** |
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451 | * Returns the array node used for "_timestamp". |
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452 | */ |
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453 | 26 | View Code Duplication | protected function getTimestampNode() |
454 | { |
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455 | 26 | $builder = new TreeBuilder(); |
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456 | 26 | $node = $builder->root('_timestamp'); |
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457 | |||
458 | $node |
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459 | 26 | ->children() |
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460 | 26 | ->scalarNode('enabled')->defaultValue(true)->end() |
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461 | 26 | ->scalarNode('path')->end() |
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462 | 26 | ->scalarNode('format')->end() |
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463 | 26 | ->scalarNode('store')->end() |
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464 | 26 | ->scalarNode('index')->end() |
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465 | 26 | ->end() |
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466 | ; |
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467 | |||
468 | 26 | return $node; |
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469 | } |
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470 | |||
471 | /** |
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472 | * Returns the array node used for "_ttl". |
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473 | */ |
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474 | 26 | View Code Duplication | protected function getTtlNode() |
475 | { |
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476 | 26 | $builder = new TreeBuilder(); |
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477 | 26 | $node = $builder->root('_ttl'); |
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478 | |||
479 | $node |
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480 | 26 | ->children() |
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481 | 26 | ->scalarNode('enabled')->defaultValue(true)->end() |
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482 | 26 | ->scalarNode('default')->end() |
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483 | 26 | ->scalarNode('store')->end() |
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484 | 26 | ->scalarNode('index')->end() |
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485 | 26 | ->end() |
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486 | ; |
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487 | |||
488 | 26 | return $node; |
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489 | } |
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490 | |||
491 | /** |
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492 | * @return ArrayNodeDefinition|\Symfony\Component\Config\Definition\Builder\NodeDefinition |
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493 | */ |
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494 | 26 | protected function getPersistenceNode() |
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586 | |||
587 | /** |
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588 | * @return ArrayNodeDefinition|\Symfony\Component\Config\Definition\Builder\NodeDefinition |
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589 | */ |
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590 | 26 | protected function getSerializerNode() |
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610 | } |
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611 |
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: