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.