Complex classes like Email 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 Email, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 11 | final class Email extends AbstractOptions |
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| 12 | { |
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| 13 | const DEFAULT_CHARSET = 'utf-8'; |
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| 14 | |||
| 15 | /** |
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| 16 | * @var string |
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| 17 | */ |
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| 18 | private $from = ''; |
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| 19 | /** |
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| 20 | * @var string |
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| 21 | */ |
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| 22 | private $fromName = ''; |
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| 23 | /** |
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| 24 | * @var string |
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| 25 | */ |
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| 26 | private $replyTo = ''; |
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| 27 | /** |
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| 28 | * @var string |
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| 29 | */ |
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| 30 | private $replyToName = ''; |
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| 31 | /** |
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| 32 | * @var array |
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| 33 | */ |
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| 34 | private $to = []; |
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| 35 | /** |
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| 36 | * @var array |
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| 37 | */ |
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| 38 | private $cc = []; |
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| 39 | /** |
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| 40 | * @var array |
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| 41 | */ |
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| 42 | private $bcc = []; |
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| 43 | /** |
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| 44 | * @var string |
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| 45 | */ |
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| 46 | private $encoding = ''; |
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| 47 | /** |
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| 48 | * @var string |
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| 49 | */ |
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| 50 | private $subject = ''; |
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| 51 | /** |
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| 52 | * @var string|Part|Message |
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| 53 | */ |
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| 54 | private $body = ''; |
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| 55 | /** |
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| 56 | * @var string|null |
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| 57 | */ |
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| 58 | private $template; |
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| 59 | /** |
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| 60 | * @var array |
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| 61 | */ |
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| 62 | private $templateParams = []; |
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| 63 | /** |
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| 64 | * @var array |
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| 65 | */ |
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| 66 | private $attachments = []; |
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| 67 | /** |
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| 68 | * @var array |
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| 69 | */ |
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| 70 | private $attachmentsDir = []; |
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| 71 | /** |
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| 72 | * @var string |
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| 73 | */ |
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| 74 | private $charset = self::DEFAULT_CHARSET; |
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| 75 | |||
| 76 | public function __construct($options = null) |
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| 81 | |||
| 82 | /** |
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| 83 | * @return string |
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| 84 | */ |
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| 85 | public function getFrom(): string |
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| 89 | |||
| 90 | /** |
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| 91 | * @param string $from |
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| 92 | * @return $this|self |
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| 93 | */ |
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| 94 | public function setFrom(string $from): self |
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| 99 | |||
| 100 | /** |
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| 101 | * @return string |
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| 102 | */ |
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| 103 | public function getFromName(): string |
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| 107 | |||
| 108 | /** |
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| 109 | * @param string $fromName |
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| 110 | * @return $this|self |
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| 111 | */ |
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| 112 | public function setFromName(string $fromName): self |
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| 117 | |||
| 118 | /** |
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| 119 | * @return string |
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| 120 | */ |
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| 121 | public function getReplyTo(): string |
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| 125 | |||
| 126 | /** |
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| 127 | * @param string $replyTo |
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| 128 | * @return $this|self |
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| 129 | */ |
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| 130 | public function setReplyTo(string $replyTo): self |
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| 135 | |||
| 136 | /** |
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| 137 | * @return string |
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| 138 | */ |
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| 139 | public function getReplyToName(): string |
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| 143 | |||
| 144 | /** |
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| 145 | * @param string $replyToName |
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| 146 | * @return $this|self |
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| 147 | */ |
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| 148 | public function setReplyToName(string $replyToName): self |
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| 153 | |||
| 154 | /** |
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| 155 | * @return array |
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| 156 | */ |
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| 157 | public function getTo(): array |
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| 161 | |||
| 162 | /** |
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| 163 | * @param array $to |
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| 164 | * @return $this|self |
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| 165 | */ |
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| 166 | public function setTo(array $to): self |
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| 171 | |||
| 172 | public function addTo(string $to): self |
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| 177 | |||
| 178 | /** |
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| 179 | * @return array |
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| 180 | */ |
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| 181 | public function getCc(): array |
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| 185 | |||
| 186 | /** |
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| 187 | * @param array $cc |
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| 188 | * @return $this|self |
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| 189 | */ |
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| 190 | public function setCc(array $cc): self |
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| 195 | |||
| 196 | public function addCc(string $cc): self |
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| 201 | |||
| 202 | /** |
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| 203 | * @return array |
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| 204 | */ |
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| 205 | public function getBcc(): array |
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| 209 | |||
| 210 | /** |
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| 211 | * @param array $bcc |
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| 212 | * @return $this|self |
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| 213 | */ |
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| 214 | public function setBcc(array $bcc): self |
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| 219 | |||
| 220 | public function addBcc(string $bcc): self |
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| 225 | |||
| 226 | /** |
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| 227 | * @return string |
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| 228 | */ |
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| 229 | public function getEncoding(): string |
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| 233 | |||
| 234 | /** |
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| 235 | * @param string $encoding |
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| 236 | * @return $this|self |
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| 237 | */ |
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| 238 | public function setEncoding(string $encoding): self |
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| 243 | |||
| 244 | /** |
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| 245 | * @return string |
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| 246 | */ |
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| 247 | public function getSubject(): string |
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| 251 | |||
| 252 | /** |
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| 253 | * @param string $subject |
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| 254 | * @return $this|self |
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| 255 | */ |
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| 256 | public function setSubject(string $subject): self |
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| 261 | |||
| 262 | /** |
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| 263 | * @return string|Part|Message |
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| 264 | */ |
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| 265 | public function getBody() |
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| 269 | |||
| 270 | /** |
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| 271 | * @param string|Part|Message $body |
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| 272 | * @return $this|self |
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| 273 | * @throws InvalidArgumentException |
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| 274 | */ |
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| 275 | public function setBody($body): self |
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| 284 | |||
| 285 | /** |
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| 286 | * @param string|resource|array|Part $file |
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| 287 | * @param string|null $filename |
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| 288 | * @return $this |
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| 289 | * @throws InvalidArgumentException |
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| 290 | */ |
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| 291 | public function addAttachment($file, string $filename = null): self |
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| 304 | |||
| 305 | /** |
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| 306 | * @param array $files |
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| 307 | * @return $this |
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| 308 | * @throws InvalidArgumentException |
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| 309 | */ |
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| 310 | public function addAttachments(array $files): self |
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| 318 | |||
| 319 | /** |
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| 320 | * @param array $files |
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| 321 | * @return $this |
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| 322 | * @throws InvalidArgumentException |
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| 323 | */ |
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| 324 | public function setAttachments(array $files): self |
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| 331 | |||
| 332 | /** |
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| 333 | * Returns the list of attachments |
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| 334 | * @return array |
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| 335 | */ |
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| 336 | public function getAttachments(): array |
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| 340 | |||
| 341 | /** |
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| 342 | * @return array |
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| 343 | */ |
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| 344 | public function getAttachmentsDir(): array |
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| 348 | |||
| 349 | /** |
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| 350 | * @param array $attachmentsDir |
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| 351 | * @return $this|self |
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| 352 | */ |
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| 353 | public function setAttachmentsDir(array $attachmentsDir): self |
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| 358 | |||
| 359 | /** |
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| 360 | * @return bool |
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| 361 | */ |
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| 362 | public function hasAttachments(): bool |
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| 366 | |||
| 367 | /** |
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| 368 | * Processes the attachments dir and merges the result with the attachments array, then returns the result |
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| 369 | * |
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| 370 | * @return array |
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| 371 | */ |
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| 372 | public function getComputedAttachments(): array |
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| 401 | |||
| 402 | /** |
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| 403 | * @return string|null |
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| 404 | */ |
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| 405 | public function getTemplate() |
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| 409 | |||
| 410 | /** |
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| 411 | * @param string|null $template |
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| 412 | * @return $this|self |
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| 413 | */ |
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| 414 | public function setTemplate(string $template = null): self |
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| 419 | |||
| 420 | /** |
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| 421 | * @return bool |
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| 422 | */ |
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| 423 | public function hasTemplate(): bool |
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| 427 | |||
| 428 | /** |
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| 429 | * @return array |
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| 430 | */ |
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| 431 | public function getTemplateParams(): array |
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| 435 | |||
| 436 | /** |
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| 437 | * @param array $templateParams |
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| 438 | * @return $this|self |
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| 439 | */ |
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| 440 | public function setTemplateParams(array $templateParams): self |
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| 445 | |||
| 446 | /** |
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| 447 | * @return string |
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| 448 | */ |
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| 449 | public function getCharset(): string |
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| 453 | |||
| 454 | /** |
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| 455 | * @param string $charset |
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| 456 | * @return $this|self |
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| 457 | */ |
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| 458 | public function setCharset(string $charset): self |
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| 463 | } |
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| 464 |