Complex classes like PayloadBuilder 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 PayloadBuilder, and based on these observations, apply Extract Interface, too.
1 | <?php |
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18 | final class PayloadBuilder implements PayloadBuilderInterface |
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19 | { |
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20 | /** |
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21 | * @param Swift_Mime_Message $message |
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22 | * |
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23 | * @return array |
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24 | */ |
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25 | 27 | public function buildPayload(Swift_Mime_Message $message) |
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50 | |||
51 | /** |
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52 | * @param Swift_Mime_Message $message |
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53 | * |
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54 | * @return array |
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55 | * @throws Exception |
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56 | */ |
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57 | 27 | private function buildRecipients(Swift_Mime_Message $message) |
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88 | |||
89 | /** |
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90 | * @param string $email |
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91 | * @param string $name |
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92 | * @param array $tags |
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93 | * @param array $metadata |
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94 | * @param array $substitutionData |
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95 | * @param string|null $originalEmail |
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96 | * |
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97 | * @return array |
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98 | */ |
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99 | 24 | private function buildRecipient( |
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131 | |||
132 | /** |
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133 | * @param Swift_Mime_Message $message |
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134 | * |
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135 | * @return array |
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136 | */ |
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137 | 24 | private function buildContent(Swift_Mime_Message $message) |
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176 | |||
177 | /** |
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178 | * @param Swift_Mime_Message $message |
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179 | * |
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180 | * @return array|string |
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181 | */ |
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182 | 24 | private function buildFrom(Swift_Mime_Message $message) |
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192 | |||
193 | /** |
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194 | * @param Swift_Mime_Message $message |
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195 | * |
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196 | * @return array |
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197 | */ |
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198 | 24 | private function buildHeaders(Swift_Mime_Message $message) |
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231 | |||
232 | /** |
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233 | * @param Swift_Mime_Message $message |
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234 | * |
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235 | * @return array |
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236 | */ |
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237 | 24 | private function buildAttachments(Swift_Mime_Message $message) |
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253 | |||
254 | /** |
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255 | * @param Swift_Mime_Message $message |
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256 | * |
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257 | * @return string |
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258 | */ |
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259 | 24 | private function buildCampaignId(Swift_Mime_Message $message) |
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267 | |||
268 | /** |
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269 | * @param Swift_Mime_Message $message |
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270 | * |
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271 | * @return array |
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272 | */ |
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273 | 24 | private function buildMetadata(Swift_Mime_Message $message) |
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281 | |||
282 | /** |
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283 | * @param Swift_Mime_Message $message |
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284 | * |
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285 | * @return array |
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286 | */ |
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287 | 24 | private function buildSubstitutionData(Swift_Mime_Message $message) |
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295 | |||
296 | /** |
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297 | * @param Swift_Mime_Message $message |
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298 | * |
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299 | * @return array |
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300 | */ |
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301 | 24 | private function buildOptions(Swift_Mime_Message $message) |
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309 | |||
310 | /** |
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311 | * Convert *|foo|* to {{foo}} |
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312 | * |
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313 | * @param string |
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314 | * |
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315 | * @return string |
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316 | */ |
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317 | 24 | private function convertAsteriskPipeToCurlyBraces($content) |
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321 | |||
322 | /** |
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323 | * @param Swift_Mime_Message $message |
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324 | * |
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325 | * @return string |
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326 | */ |
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327 | 24 | private function readUserContentType(Swift_Mime_Message $message) |
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334 | } |
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335 |
This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent.
Consider making the comparison explicit by using
empty(..)
or! empty(...)
instead.