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 RawDrupalContext 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 RawDrupalContext, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 25 | class RawDrupalContext extends RawMinkContext implements DrupalAwareInterface { |
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| 26 | |||
| 27 | /** |
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| 28 | * Drupal driver manager. |
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| 29 | * |
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| 30 | * @var \Drupal\DrupalDriverManager |
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| 31 | */ |
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| 32 | private $drupal; |
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| 33 | |||
| 34 | /** |
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| 35 | * Test parameters. |
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| 36 | * |
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| 37 | * @var array |
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| 38 | */ |
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| 39 | private $drupalParameters; |
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| 40 | |||
| 41 | /** |
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| 42 | * Event dispatcher object. |
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| 43 | * |
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| 44 | * @var \Behat\Testwork\Hook\HookDispatcher |
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| 45 | */ |
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| 46 | protected $dispatcher; |
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| 47 | |||
| 48 | /** |
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| 49 | * Keep track of nodes so they can be cleaned up. |
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| 50 | * |
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| 51 | * @var array |
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| 52 | */ |
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| 53 | protected $nodes = array(); |
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| 54 | |||
| 55 | /** |
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| 56 | * Current authenticated user. |
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| 57 | * |
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| 58 | * A value of FALSE denotes an anonymous user. |
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| 59 | * |
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| 60 | * @var \stdClass|bool |
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| 61 | */ |
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| 62 | public $user = FALSE; |
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| 63 | |||
| 64 | /** |
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| 65 | * Keep track of all users that are created so they can easily be removed. |
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| 66 | * |
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| 67 | * @var array |
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| 68 | */ |
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| 69 | protected $users = array(); |
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| 70 | |||
| 71 | /** |
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| 72 | * Keep track of all terms that are created so they can easily be removed. |
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| 73 | * |
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| 74 | * @var array |
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| 75 | */ |
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| 76 | protected $terms = array(); |
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| 77 | |||
| 78 | /** |
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| 79 | * Keep track of any roles that are created so they can easily be removed. |
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| 80 | * |
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| 81 | * @var array |
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| 82 | */ |
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| 83 | protected $roles = array(); |
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| 84 | |||
| 85 | /** |
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| 86 | * Keep track of any languages that are created so they can easily be removed. |
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| 87 | * |
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| 88 | * @var array |
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| 89 | */ |
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| 90 | protected $languages = array(); |
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| 91 | |||
| 92 | /** |
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| 93 | * {@inheritDoc} |
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| 94 | */ |
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| 95 | public function setDrupal(DrupalDriverManager $drupal) { |
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| 98 | |||
| 99 | /** |
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| 100 | * {@inheritDoc} |
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| 101 | */ |
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| 102 | public function getDrupal() { |
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| 103 | return $this->drupal; |
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| 104 | } |
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| 105 | |||
| 106 | /** |
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| 107 | * {@inheritDoc} |
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| 108 | */ |
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| 109 | public function setDispatcher(HookDispatcher $dispatcher) { |
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| 110 | $this->dispatcher = $dispatcher; |
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| 111 | } |
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| 112 | |||
| 113 | /** |
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| 114 | * Set parameters provided for Drupal. |
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| 115 | */ |
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| 116 | public function setDrupalParameters(array $parameters) { |
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| 117 | $this->drupalParameters = $parameters; |
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| 118 | } |
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| 119 | |||
| 120 | /** |
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| 121 | * Returns a specific Drupal parameter. |
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| 122 | * |
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| 123 | * @param string $name |
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| 124 | * Parameter name. |
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| 125 | * |
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| 126 | * @return mixed |
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| 127 | */ |
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| 128 | public function getDrupalParameter($name) { |
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| 129 | return isset($this->drupalParameters[$name]) ? $this->drupalParameters[$name] : NULL; |
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| 130 | } |
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| 131 | |||
| 132 | /** |
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| 133 | * Returns a specific Drupal text value. |
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| 134 | * |
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| 135 | * @param string $name |
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| 136 | * Text value name, such as 'log_out', which corresponds to the default 'Log |
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| 137 | * out' link text. |
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| 138 | * @throws \Exception |
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| 139 | * @return |
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| 140 | */ |
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| 141 | public function getDrupalText($name) { |
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| 142 | $text = $this->getDrupalParameter('text'); |
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| 143 | if (!isset($text[$name])) { |
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| 144 | throw new \Exception(sprintf('No such Drupal string: %s', $name)); |
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| 145 | } |
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| 146 | return $text[$name]; |
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| 147 | } |
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| 148 | |||
| 149 | /** |
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| 150 | * Returns a specific css selector. |
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| 151 | * |
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| 152 | * @param $name |
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| 153 | * string CSS selector name |
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| 154 | */ |
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| 155 | public function getDrupalSelector($name) { |
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| 162 | |||
| 163 | /** |
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| 164 | * Get active Drupal Driver. |
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| 165 | * |
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| 166 | * @return \Drupal\Driver\DrupalDriver |
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| 167 | */ |
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| 168 | public function getDriver($name = NULL) { |
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| 169 | return $this->getDrupal()->getDriver($name); |
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| 170 | } |
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| 171 | |||
| 172 | /** |
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| 173 | * Get driver's random generator. |
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| 174 | */ |
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| 175 | public function getRandom() { |
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| 176 | return $this->getDriver()->getRandom(); |
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| 177 | } |
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| 178 | |||
| 179 | /** |
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| 180 | * Massage node values to match the expectations on different Drupal versions. |
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| 181 | * |
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| 182 | * @beforeNodeCreate |
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| 183 | */ |
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| 184 | public function alterNodeParameters(BeforeNodeCreateScope $scope) { |
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| 206 | |||
| 207 | /** |
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| 208 | * Remove any created nodes. |
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| 209 | * |
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| 210 | * @AfterScenario |
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| 211 | */ |
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| 212 | public function cleanNodes() { |
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| 219 | |||
| 220 | /** |
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| 221 | * Remove any created users. |
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| 222 | * |
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| 223 | * @AfterScenario |
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| 224 | */ |
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| 225 | public function cleanUsers() { |
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| 239 | |||
| 240 | /** |
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| 241 | * Remove any created terms. |
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| 242 | * |
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| 243 | * @AfterScenario |
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| 244 | */ |
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| 245 | public function cleanTerms() { |
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| 252 | |||
| 253 | /** |
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| 254 | * Remove any created roles. |
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| 255 | * |
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| 256 | * @AfterScenario |
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| 257 | */ |
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| 258 | public function cleanRoles() { |
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| 265 | |||
| 266 | /** |
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| 267 | * Remove any created languages. |
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| 268 | * |
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| 269 | * @AfterScenario |
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| 270 | */ |
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| 271 | public function cleanLanguages() { |
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| 278 | |||
| 279 | /** |
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| 280 | * Clear static caches. |
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| 281 | * |
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| 282 | * @AfterScenario @api |
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| 283 | */ |
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| 284 | public function clearStaticCaches() { |
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| 287 | |||
| 288 | /** |
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| 289 | * Dispatch scope hooks. |
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| 290 | * |
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| 291 | * @param string $scope |
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| 292 | * The entity scope to dispatch. |
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| 293 | * @param \stdClass $entity |
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| 294 | * The entity. |
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| 295 | */ |
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| 296 | protected function dispatchHooks($scopeType, \stdClass $entity) { |
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| 309 | |||
| 310 | /** |
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| 311 | * Create a node. |
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| 312 | * |
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| 313 | * @return object |
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| 314 | * The created node. |
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| 315 | */ |
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| 316 | View Code Duplication | public function nodeCreate($node) { |
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| 324 | |||
| 325 | /** |
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| 326 | * Parse multi-value fields. Possible formats: |
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| 327 | * A, B, C |
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| 328 | * A - B, C - D, E - F |
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| 329 | * |
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| 330 | * @param string $entity_type |
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| 331 | * The entity type. |
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| 332 | * @param \stdClass $entity |
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| 333 | * An object containing the entity properties and fields as properties. |
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| 334 | */ |
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| 335 | public function parseEntityFields($entity_type, \stdClass $entity) { |
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| 402 | |||
| 403 | /** |
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| 404 | * Create a user. |
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| 405 | * |
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| 406 | * @return object |
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| 407 | * The created user. |
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| 408 | */ |
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| 409 | View Code Duplication | public function userCreate($user) { |
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| 417 | |||
| 418 | /** |
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| 419 | * Create a term. |
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| 420 | * |
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| 421 | * @return object |
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| 422 | * The created term. |
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| 423 | */ |
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| 424 | View Code Duplication | public function termCreate($term) { |
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| 432 | |||
| 433 | /** |
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| 434 | * Creates a language. |
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| 435 | * |
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| 436 | * @param \stdClass $language |
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| 437 | * An object with the following properties: |
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| 438 | * - langcode: the langcode of the language to create. |
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| 439 | * |
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| 440 | * @return object|FALSE |
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| 441 | * The created language, or FALSE if the language was already created. |
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| 442 | */ |
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| 443 | public function languageCreate(\stdClass $language) { |
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| 452 | |||
| 453 | /** |
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| 454 | * Log-in the current user. |
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| 455 | */ |
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| 456 | public function login() { |
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| 487 | |||
| 488 | /** |
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| 489 | * Logs the current user out. |
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| 490 | */ |
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| 491 | public function logout() { |
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| 494 | |||
| 495 | /** |
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| 496 | * Determine if the a user is already logged in. |
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| 497 | * |
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| 498 | * @return boolean |
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| 499 | * Returns TRUE if a user is logged in for this session. |
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| 500 | */ |
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| 501 | public function loggedIn() { |
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| 529 | |||
| 530 | /** |
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| 531 | * User with a given role is already logged in. |
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| 532 | * |
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| 533 | * @param string $role |
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| 534 | * A single role, or multiple comma-separated roles in a single string. |
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| 535 | * |
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| 536 | * @return boolean |
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| 537 | * Returns TRUE if the current logged in user has this role (or roles). |
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| 538 | */ |
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| 539 | public function loggedInWithRole($role) { |
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| 542 | |||
| 543 | } |
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| 544 |
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 implementation 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 interface: