Complex classes like JSend 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 JSend, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 14 | final class JSend implements JSendInterface |
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| 15 | { |
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| 16 | use JSendStatusTrait; |
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| 17 | use JSendJsonTrait; |
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| 18 | |||
| 19 | /** |
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| 20 | * @var array |
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| 21 | */ |
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| 22 | private $decoded = []; |
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| 23 | /** |
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| 24 | * @var JSendInterface |
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| 25 | */ |
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| 26 | private $jsend; |
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| 27 | |||
| 28 | /** |
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| 29 | * JSend constructor. |
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| 30 | * |
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| 31 | * @param Status $status |
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| 32 | * @param array $decoded |
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| 33 | */ |
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| 34 | public function __construct(Status $status, array $decoded) |
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| 43 | |||
| 44 | /** |
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| 45 | * @param string $json |
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| 46 | * |
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| 47 | * @return array |
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| 48 | * @throws InvalidJsonException |
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| 49 | */ |
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| 50 | public static function safeDecode(string $json): array |
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| 59 | |||
| 60 | /** |
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| 61 | * @param string $json |
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| 62 | * |
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| 63 | * @return JSend |
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| 64 | * @throws InvalidJsonException |
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| 65 | */ |
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| 66 | public static function decode(string $json): self |
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| 72 | |||
| 73 | /** |
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| 74 | * @param array $decoded |
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| 75 | * |
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| 76 | * @return JSend |
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| 77 | */ |
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| 78 | public static function from(array $decoded): self |
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| 84 | |||
| 85 | /** |
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| 86 | * @param ResponseInterface $response |
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| 87 | * |
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| 88 | * @return JSendInterface |
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| 89 | * @throws EnsuranceException |
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| 90 | * @throws InvalidJsonException |
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| 91 | */ |
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| 92 | public static function translate(ResponseInterface $response): JSendInterface |
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| 103 | |||
| 104 | /** |
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| 105 | * @param array|null $data |
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| 106 | * |
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| 107 | * @return JSend |
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| 108 | */ |
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| 109 | public static function success(array $data = null): self |
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| 113 | |||
| 114 | /** |
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| 115 | * @param array|null $data |
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| 116 | * |
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| 117 | * @return JSend |
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| 118 | */ |
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| 119 | public static function fail(array $data = null): self |
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| 123 | |||
| 124 | /** |
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| 125 | * @param string $message |
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| 126 | * @param int|null $code |
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| 127 | * |
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| 128 | * @return JSend |
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| 129 | */ |
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| 130 | public static function error(string $message, int $code = null): self |
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| 134 | |||
| 135 | /** |
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| 136 | * @return array |
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| 137 | */ |
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| 138 | public function asArray(): array |
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| 142 | |||
| 143 | /** |
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| 144 | * @param callable $closure |
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| 145 | * |
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| 146 | * @return bool |
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| 147 | */ |
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| 148 | public function onSuccess(callable $closure): bool |
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| 158 | |||
| 159 | /** |
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| 160 | * @param callable $closure |
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| 161 | * |
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| 162 | * @return bool |
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| 163 | */ |
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| 164 | public function onFail(callable $closure): bool |
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| 174 | |||
| 175 | /** |
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| 176 | * @param callable $closure |
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| 177 | * |
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| 178 | * @return bool |
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| 179 | */ |
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| 180 | public function onError(callable $closure): bool |
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| 190 | |||
| 191 | /** |
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| 192 | * @return JSendInterface |
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| 193 | * @throws EnsuranceException |
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| 194 | */ |
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| 195 | public function into(): JSendInterface |
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| 211 | |||
| 212 | /** |
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| 213 | * @return JSendSuccess |
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| 214 | */ |
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| 215 | public function intoSuccess(): JSendSuccess |
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| 223 | |||
| 224 | /** |
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| 225 | * @return JSendFail |
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| 226 | */ |
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| 227 | public function intoFail(): JSendFail |
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| 235 | |||
| 236 | /** |
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| 237 | * @return JSendError |
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| 238 | */ |
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| 239 | public function intoError(): JSendError |
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| 247 | |||
| 248 | /** |
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| 249 | * @return int |
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| 250 | * @throws EnsuranceException |
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| 251 | */ |
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| 252 | public function getDefaultHttpStatusCode(): int |
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| 256 | |||
| 257 | /** |
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| 258 | * @param string|null $key |
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| 259 | * |
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| 260 | * @return bool |
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| 261 | * @throws EnsuranceException |
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| 262 | */ |
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| 263 | public function hasData(string $key = null): bool |
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| 267 | |||
| 268 | /** |
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| 269 | * @param string|null $key |
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| 270 | * @param null $default |
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| 271 | * |
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| 272 | * @return mixed |
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| 273 | * @throws EnsuranceException |
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| 274 | */ |
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| 275 | public function getData(string $key = null, $default = null) |
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| 279 | |||
| 280 | /** |
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| 281 | * @param int|null $code |
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| 282 | * |
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| 283 | * @throws EnsuranceException |
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| 284 | */ |
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| 285 | public function respond(int $code = null): void |
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| 289 | |||
| 290 | /** |
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| 291 | * @return int |
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| 292 | * @throws EnsuranceException |
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| 293 | */ |
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| 294 | public function getStatusCode(): int |
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| 298 | |||
| 299 | /** |
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| 300 | * @return string |
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| 301 | * @throws EnsuranceException |
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| 302 | */ |
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| 303 | public function getProtocolVersion() |
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| 307 | |||
| 308 | /** |
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| 309 | * @param string $version |
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| 310 | * |
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| 311 | * @return JSendInterface |
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| 312 | * @throws EnsuranceException |
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| 313 | */ |
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| 314 | public function withProtocolVersion($version) |
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| 318 | |||
| 319 | /** |
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| 320 | * @return \string[][] |
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| 321 | * @throws EnsuranceException |
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| 322 | */ |
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| 323 | public function getHeaders() |
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| 327 | |||
| 328 | /** |
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| 329 | * @param string $name |
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| 330 | * |
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| 331 | * @return bool |
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| 332 | * @throws EnsuranceException |
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| 333 | */ |
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| 334 | public function hasHeader($name) |
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| 338 | |||
| 339 | /** |
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| 340 | * @param string $name |
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| 341 | * |
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| 342 | * @return string[] |
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| 343 | * @throws EnsuranceException |
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| 344 | */ |
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| 345 | public function getHeader($name) |
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| 349 | |||
| 350 | /** |
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| 351 | * @param string $name |
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| 352 | * |
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| 353 | * @return string |
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| 354 | * @throws EnsuranceException |
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| 355 | */ |
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| 356 | public function getHeaderLine($name) |
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| 360 | |||
| 361 | /** |
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| 362 | * @param string $name |
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| 363 | * @param string|string[] $value |
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| 364 | * |
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| 365 | * @return JSendInterface |
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| 366 | * @throws EnsuranceException |
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| 367 | */ |
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| 368 | public function withHeader($name, $value) |
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| 372 | |||
| 373 | /** |
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| 374 | * @param string $name |
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| 375 | * @param string|string[] $value |
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| 376 | * |
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| 377 | * @return JSendInterface |
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| 378 | * @throws EnsuranceException |
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| 379 | */ |
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| 380 | public function withAddedHeader($name, $value) |
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| 384 | |||
| 385 | /** |
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| 386 | * @param string $name |
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| 387 | * |
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| 388 | * @return JSendInterface |
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| 389 | * @throws EnsuranceException |
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| 390 | */ |
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| 391 | public function withoutHeader($name) |
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| 395 | |||
| 396 | /** |
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| 397 | * @return StreamInterface |
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| 398 | * @throws EnsuranceException |
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| 399 | */ |
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| 400 | public function getBody() |
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| 404 | |||
| 405 | /** |
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| 406 | * @param StreamInterface $body |
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| 407 | * |
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| 408 | * @return JSendInterface |
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| 409 | * @throws EnsuranceException |
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| 410 | */ |
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| 411 | public function withBody(StreamInterface $body) |
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| 415 | |||
| 416 | /** |
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| 417 | * @param int $code |
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| 418 | * @param string $reasonPhrase |
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| 419 | * |
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| 420 | * @return JSendInterface |
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| 421 | * @throws EnsuranceException |
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| 422 | */ |
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| 423 | public function withStatus($code, $reasonPhrase = '') |
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| 427 | |||
| 428 | /** |
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| 429 | * @return string |
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| 430 | * @throws EnsuranceException |
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| 431 | */ |
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| 432 | public function getReasonPhrase() |
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| 436 | } |
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| 437 |
This check marks access to variables or properties that have not been declared yet. While PHP has no explicit notion of declaring a variable, accessing it before a value is assigned to it is most likely a bug.