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:
Complex classes like SearchService often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use SearchService, and based on these observations, apply Extract Interface, too.
1 | <?php |
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34 | class SearchService implements SearchServiceInterface |
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35 | { |
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36 | /** |
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37 | * @var \eZ\Publish\Core\Repository\Repository |
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38 | */ |
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39 | protected $repository; |
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40 | |||
41 | /** |
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42 | * @var \eZ\Publish\SPI\Search\Handler |
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43 | */ |
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44 | protected $searchHandler; |
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45 | |||
46 | /** |
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47 | * @var array |
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48 | */ |
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49 | protected $settings; |
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50 | |||
51 | /** |
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52 | * @var \eZ\Publish\Core\Repository\Helper\DomainMapper |
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53 | */ |
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54 | protected $domainMapper; |
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55 | |||
56 | /** |
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57 | * @var \eZ\Publish\API\Repository\PermissionCriterionResolver |
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58 | */ |
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59 | protected $permissionCriterionResolver; |
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60 | |||
61 | /** |
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62 | * @var \eZ\Publish\Core\Search\Common\BackgroundIndexer |
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63 | */ |
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64 | protected $backgroundIndexer; |
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65 | |||
66 | /** |
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67 | * Setups service with reference to repository object that created it & corresponding handler. |
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68 | * |
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69 | * @param \eZ\Publish\API\Repository\Repository $repository |
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70 | * @param \eZ\Publish\SPI\Search\Handler $searchHandler |
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71 | * @param \eZ\Publish\Core\Repository\Helper\DomainMapper $domainMapper |
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72 | * @param \eZ\Publish\API\Repository\PermissionCriterionResolver $permissionCriterionResolver |
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73 | * @param \eZ\Publish\Core\Search\Common\BackgroundIndexer $backgroundIndexer |
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74 | * @param array $settings |
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75 | */ |
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76 | public function __construct( |
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94 | |||
95 | /** |
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96 | * Finds content objects for the given query. |
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97 | * |
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98 | * @throws \eZ\Publish\API\Repository\Exceptions\InvalidArgumentException if query is not valid |
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99 | * |
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100 | * @param \eZ\Publish\API\Repository\Values\Content\Query $query |
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101 | * @param array $languageFilter Configuration for specifying prioritized languages query will be performed on. |
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102 | * Currently supports: <code>array("languages" => array(<language1>,..), "useAlwaysAvailable" => bool)</code> |
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103 | * useAlwaysAvailable defaults to true to avoid exceptions on missing translations. |
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104 | * @param bool $filterOnUserPermissions if true only the objects which the user is allowed to read are returned. |
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105 | * |
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106 | * @return \eZ\Publish\API\Repository\Values\Content\Search\SearchResult |
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107 | */ |
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108 | public function findContent(Query $query, array $languageFilter = array(), $filterOnUserPermissions = true) |
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136 | |||
137 | /** |
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138 | * Finds contentInfo objects for the given query. |
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139 | * |
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140 | * @see SearchServiceInterface::findContentInfo() |
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141 | * |
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142 | * @since 5.4.5 |
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143 | * @throws \eZ\Publish\API\Repository\Exceptions\InvalidArgumentException if query is not valid |
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144 | * |
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145 | * @param \eZ\Publish\API\Repository\Values\Content\Query $query |
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146 | * @param array $languageFilter - a map of filters for the returned fields. |
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147 | * Currently supports: <code>array("languages" => array(<language1>,..), "useAlwaysAvailable" => bool)</code> |
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148 | * useAlwaysAvailable defaults to true to avoid exceptions on missing translations. |
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149 | * @param bool $filterOnUserPermissions if true (default) only the objects which is the user allowed to read are returned. |
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150 | * |
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151 | * @return \eZ\Publish\API\Repository\Values\Content\Search\SearchResult |
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152 | */ |
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153 | public function findContentInfo(Query $query, array $languageFilter = array(), $filterOnUserPermissions = true) |
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164 | |||
165 | /** |
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166 | * Finds SPI content info objects for the given query. |
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167 | * |
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168 | * Internal for use by {@link findContent} and {@link findContentInfo}. |
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169 | * |
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170 | * @throws \eZ\Publish\API\Repository\Exceptions\InvalidArgumentException if query is not valid |
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171 | * |
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172 | * @param \eZ\Publish\API\Repository\Values\Content\Query $query |
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173 | * @param array $languageFilter - a map of filters for the returned fields. |
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174 | * Currently supports: <code>array("languages" => array(<language1>,..), "useAlwaysAvailable" => bool)</code> |
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175 | * useAlwaysAvailable defaults to true to avoid exceptions on missing translations. |
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176 | * @param bool $filterOnUserPermissions if true only the objects which is the user allowed to read are returned. |
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177 | * |
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178 | * @return \eZ\Publish\API\Repository\Values\Content\Search\SearchResult With "raw" SPI contentInfo objects in result |
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179 | */ |
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180 | protected function internalFindContentInfo(Query $query, array $languageFilter = array(), $filterOnUserPermissions = true) |
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211 | |||
212 | /** |
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213 | * Checks that $criteria does not contain Location criterions. |
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214 | * |
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215 | * @throws \eZ\Publish\API\Repository\Exceptions\InvalidArgumentException |
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216 | * |
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217 | * @param \eZ\Publish\API\Repository\Values\Content\Query\Criterion[] $criteria |
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218 | * @param string $argumentName |
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219 | */ |
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220 | protected function validateContentCriteria(array $criteria, $argumentName) |
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234 | |||
235 | /** |
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236 | * Checks that $query does not contain Location sort clauses. |
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237 | * |
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238 | * @throws \eZ\Publish\API\Repository\Exceptions\InvalidArgumentException |
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239 | * |
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240 | * @param \eZ\Publish\API\Repository\Values\Content\Query $query |
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241 | */ |
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242 | protected function validateContentSortClauses(Query $query) |
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250 | |||
251 | /** |
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252 | * Performs a query for a single content object. |
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253 | * |
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254 | * @throws \eZ\Publish\API\Repository\Exceptions\NotFoundException if the object was not found by the query or due to permissions |
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255 | * @throws \eZ\Publish\API\Repository\Exceptions\InvalidArgumentException if criterion is not valid |
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256 | * @throws \eZ\Publish\API\Repository\Exceptions\InvalidArgumentException if there is more than one result matching the criterions |
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257 | * |
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258 | * @param \eZ\Publish\API\Repository\Values\Content\Query\Criterion $filter |
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259 | * @param array $languageFilter Configuration for specifying prioritized languages query will be performed on. |
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260 | * Currently supports: <code>array("languages" => array(<language1>,..), "useAlwaysAvailable" => bool)</code> |
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261 | * useAlwaysAvailable defaults to true to avoid exceptions on missing translations. |
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262 | * @param bool $filterOnUserPermissions if true only the objects which is the user allowed to read are returned. |
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263 | * |
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264 | * @return \eZ\Publish\API\Repository\Values\Content\Content |
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265 | */ |
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266 | public function findSingle(Criterion $filter, array $languageFilter = array(), $filterOnUserPermissions = true) |
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284 | |||
285 | /** |
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286 | * Suggests a list of values for the given prefix. |
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287 | * |
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288 | * @param string $prefix |
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289 | * @param string[] $fieldPaths |
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290 | * @param int $limit |
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291 | * @param \eZ\Publish\API\Repository\Values\Content\Query\Criterion $filter |
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292 | */ |
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293 | public function suggest($prefix, $fieldPaths = array(), $limit = 10, Criterion $filter = null) |
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296 | |||
297 | /** |
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298 | * Finds Locations for the given query. |
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299 | * |
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300 | * @throws \eZ\Publish\API\Repository\Exceptions\InvalidArgumentException if query is not valid |
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301 | * |
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302 | * @param \eZ\Publish\API\Repository\Values\Content\LocationQuery $query |
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303 | * @param array $languageFilter Configuration for specifying prioritized languages query will be performed on. |
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304 | * Currently supports: <code>array("languages" => array(<language1>,..), "useAlwaysAvailable" => bool)</code> |
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305 | * useAlwaysAvailable defaults to true to avoid exceptions on missing translations |
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306 | * @param bool $filterOnUserPermissions if true only the objects which is the user allowed to read are returned. |
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307 | * |
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308 | * @return \eZ\Publish\API\Repository\Values\Content\Search\SearchResult |
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309 | */ |
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310 | public function findLocations(LocationQuery $query, array $languageFilter = array(), $filterOnUserPermissions = true) |
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344 | |||
345 | /** |
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346 | * Adds content, read Permission criteria if needed and return false if no access at all. |
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347 | * |
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348 | * @uses \eZ\Publish\API\Repository\PermissionCriterionResolver::getPermissionsCriterion() |
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349 | * |
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350 | * @param \eZ\Publish\API\Repository\Values\Content\Query\Criterion $criterion |
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351 | * |
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352 | * @return bool|\eZ\Publish\API\Repository\Values\Content\Query\Criterion |
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353 | */ |
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354 | View Code Duplication | protected function addPermissionsCriterion(Criterion &$criterion) |
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375 | |||
376 | public function supports($capabilityFlag) |
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384 | } |
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385 |
Our type inference engine has found a suspicous assignment of a value to a property. This check raises an issue when a value that can be of a given class or a super-class is assigned to a property that is type hinted more strictly.
Either this assignment is in error or an instanceof check should be added for that assignment.