Complex classes like DocumentGenerator 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 DocumentGenerator, and based on these observations, apply Extract Interface, too.
1 | <?php |
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19 | class DocumentGenerator |
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20 | { |
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21 | /** |
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22 | * @var string |
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23 | */ |
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24 | private $spaces = ' '; |
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25 | |||
26 | /** |
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27 | * @var string |
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28 | */ |
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29 | private $getMethodTemplate = |
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30 | '/** |
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31 | * Returns <fieldName> |
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32 | * |
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33 | * @return string |
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34 | */ |
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35 | public function get<methodName>() |
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36 | { |
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37 | <spaces>return $this-><fieldName>; |
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38 | }'; |
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39 | |||
40 | /** |
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41 | * @var string |
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42 | */ |
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43 | private $isMethodTemplate = |
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44 | '/** |
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45 | * Returns <fieldName> |
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46 | * |
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47 | * @return string |
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48 | */ |
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49 | public function is<methodName>() |
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50 | { |
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51 | <spaces>return $this-><fieldName>; |
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52 | }'; |
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53 | |||
54 | /** |
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55 | * @var string |
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56 | */ |
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57 | private $setMethodTemplate = |
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58 | '/** |
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59 | * Sets <fieldName> |
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60 | * |
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61 | * @param string $<fieldName> |
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62 | * |
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63 | * @return self |
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64 | */ |
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65 | public function set<methodName>($<fieldName>) |
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66 | { |
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67 | <spaces>$this-><fieldName> = $<fieldName>; |
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68 | |||
69 | <spaces>return $this; |
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70 | }'; |
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71 | |||
72 | /** |
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73 | * @var string |
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74 | */ |
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75 | private $constructorTemplate = |
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76 | '/** |
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77 | * Constructor |
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78 | */ |
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79 | public function __construct() |
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80 | { |
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81 | <fields> |
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82 | }'; |
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83 | |||
84 | /** |
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85 | * @param array $metadata |
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86 | * |
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87 | * @return string |
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88 | */ |
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89 | public function generateDocumentClass(array $metadata) |
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105 | |||
106 | /** |
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107 | * Generates document body |
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108 | * |
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109 | * @param array $metadata |
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110 | * |
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111 | * @return string |
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112 | */ |
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113 | private function generateDocumentBody(array $metadata) |
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131 | |||
132 | /** |
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133 | * Generates document properties |
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134 | * |
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135 | * @param array $metadata |
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136 | * |
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137 | * @return string |
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138 | */ |
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139 | private function generateDocumentProperties(array $metadata) |
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150 | |||
151 | /** |
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152 | * Generates document methods |
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153 | * |
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154 | * @param array $metadata |
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155 | * |
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156 | * @return string |
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157 | */ |
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158 | private function generateDocumentMethods(array $metadata) |
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176 | |||
177 | /** |
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178 | * Generates document constructor |
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179 | * |
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180 | * @param array $metadata |
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181 | * |
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182 | * @return string |
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183 | */ |
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184 | private function generateDocumentConstructor(array $metadata) |
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198 | |||
199 | /** |
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200 | * Generates document method |
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201 | * |
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202 | * @param array $metadata |
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203 | * @param string $template |
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204 | * |
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205 | * @return string |
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206 | */ |
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207 | private function generateDocumentMethod(array $metadata, $template) |
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217 | |||
218 | /** |
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219 | * Returns property doc block |
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220 | * |
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221 | * @param array $metadata |
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222 | * |
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223 | * @return string |
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224 | */ |
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225 | private function generatePropertyDocBlock(array $metadata) |
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264 | |||
265 | /** |
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266 | * Generates document doc block |
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267 | * |
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268 | * @param array $metadata |
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269 | * |
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270 | * @return string |
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271 | */ |
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272 | private function generateDocumentDocBlock(array $metadata) |
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289 | |||
290 | /** |
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291 | * @param string $code |
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292 | * |
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293 | * @return string |
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294 | */ |
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295 | private function prefixWithSpaces($code) |
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307 | |||
308 | /** |
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309 | * Returns class name |
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310 | * |
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311 | * @param array $metadata |
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312 | * |
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313 | * @return string |
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314 | */ |
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315 | private function getClassName(array $metadata) |
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320 | |||
321 | /** |
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322 | * Generates document use statements |
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323 | * |
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324 | * @param array $metadata |
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325 | * |
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326 | * @return string |
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327 | */ |
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328 | private function generateDocumentUse(array $metadata) |
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338 | |||
339 | /** |
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340 | * @param array $metadata |
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341 | * |
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342 | * @return bool |
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343 | */ |
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344 | private function hasMultipleEmbedded(array $metadata) |
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354 | } |
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355 |