Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
Complex classes like Document 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 Document, and based on these observations, apply Extract Interface, too.
1 | <?php |
||
17 | class Document implements JsonSerializable |
||
18 | { |
||
19 | use LinksTrait; |
||
20 | use MetaTrait; |
||
21 | |||
22 | const MEDIA_TYPE = 'application/vnd.api+json'; |
||
23 | |||
24 | /** |
||
25 | * The data object. |
||
26 | * |
||
27 | * @var ResourceInterface|ResourceInterface[]|null |
||
28 | */ |
||
29 | protected $data; |
||
30 | |||
31 | /** |
||
32 | * The errors array. |
||
33 | * |
||
34 | * @var array|null |
||
35 | */ |
||
36 | protected $errors; |
||
37 | |||
38 | /** |
||
39 | * The jsonapi array. |
||
40 | * |
||
41 | * @var array|null |
||
42 | */ |
||
43 | protected $jsonapi; |
||
44 | |||
45 | /** |
||
46 | * Relationships to include. |
||
47 | * |
||
48 | * @var array |
||
49 | */ |
||
50 | protected $include = []; |
||
51 | |||
52 | 12 | /** |
|
53 | * Sparse fieldsets. |
||
54 | 12 | * |
|
55 | 12 | * @var array |
|
56 | */ |
||
57 | protected $fields = []; |
||
58 | |||
59 | /** |
||
60 | * @param ResourceInterface|ResourceInterface[] $data |
||
|
|||
61 | */ |
||
62 | public function __construct($data = null) |
||
66 | |||
67 | 9 | /** |
|
68 | * Get the data object. |
||
69 | 9 | * |
|
70 | 9 | * @return ResourceInterface|ResourceInterface[]|null $data |
|
71 | */ |
||
72 | public function getData() |
||
76 | 3 | ||
77 | 9 | /** |
|
78 | 9 | * Set the data object. |
|
79 | * |
||
80 | * @param ResourceInterface|ResourceInterface[]|null $data |
||
81 | 9 | * |
|
82 | 3 | * @return $this |
|
83 | */ |
||
84 | 3 | public function setData($data) |
|
90 | |||
91 | /** |
||
92 | 3 | * Get the errors array. |
|
93 | * |
||
94 | * @return array|null $errors |
||
95 | */ |
||
96 | 3 | public function getErrors() |
|
100 | |||
101 | 9 | /** |
|
102 | * Set the errors array. |
||
103 | * |
||
104 | 3 | * @param array|null $errors |
|
105 | 9 | * |
|
106 | * @return $this |
||
107 | 9 | */ |
|
108 | public function setErrors(array $errors = null) |
||
114 | |||
115 | /** |
||
116 | 3 | * Get the jsonapi array. |
|
117 | * |
||
118 | 3 | * @return array|null $jsonapi |
|
119 | 3 | */ |
|
120 | public function getJsonapi() |
||
124 | 3 | ||
125 | /** |
||
126 | * Set the jsonapi array. |
||
127 | 3 | * |
|
128 | * @param array|null $jsonapi |
||
129 | * |
||
130 | * @return $this |
||
131 | */ |
||
132 | public function setJsonapi(array $jsonapi = null) |
||
138 | |||
139 | /** |
||
140 | * Get the relationships to include. |
||
141 | * |
||
142 | * @return array $include |
||
143 | */ |
||
144 | public function getInclude() |
||
148 | |||
149 | /** |
||
150 | * Set the relationships to include. |
||
151 | * |
||
152 | * @param array $include |
||
153 | * |
||
154 | * @return $this |
||
155 | */ |
||
156 | public function setInclude(array $include) |
||
162 | |||
163 | /** |
||
164 | * Get the sparse fieldsets. |
||
165 | * |
||
166 | * @return array $fields |
||
167 | */ |
||
168 | public function getFields() |
||
172 | |||
173 | /** |
||
174 | * Set the sparse fieldsets. |
||
175 | * |
||
176 | * @param array $fields |
||
177 | 12 | * |
|
178 | * @return $this |
||
179 | 12 | */ |
|
180 | public function setFields(array $fields) |
||
186 | 9 | ||
187 | /** |
||
188 | 9 | * Build the JSON-API document as an array. |
|
189 | * |
||
190 | 9 | * @return array |
|
191 | 3 | */ |
|
192 | 3 | public function toArray() |
|
247 | |||
248 | /** |
||
249 | * Build the JSON-API document and encode it as a JSON string. |
||
250 | * |
||
251 | * @return string |
||
252 | */ |
||
253 | public function __toString() |
||
257 | |||
258 | /** |
||
259 | * Serialize for JSON usage. |
||
260 | * |
||
261 | * @return array |
||
262 | */ |
||
263 | public function jsonSerialize() |
||
267 | |||
268 | /** |
||
269 | * Recursively add the given resources and their relationships to a map. |
||
270 | * |
||
271 | * @param array &$map The map to merge resources into. |
||
272 | * @param ResourceInterface[] $resources |
||
273 | * @param array $include An array of relationship paths to include. |
||
274 | */ |
||
275 | private function addResourcesToMap(array &$map, array $resources, array $include) |
||
308 | |||
309 | /** |
||
310 | * Serialize the given resource as an array and add it to the given map. |
||
311 | * |
||
312 | * If it is already present in the map, its properties will be merged into |
||
313 | * the existing array. |
||
314 | * |
||
315 | * @param array &$map |
||
316 | * @param ResourceInterface $resource |
||
317 | * @param Relationship[] $resource |
||
318 | */ |
||
319 | private function addResourceToMap(array &$map, ResourceInterface $resource, array $relationships) |
||
362 | |||
363 | /** |
||
364 | * Index relationship paths by top-level relationships. |
||
365 | * |
||
366 | * Given an array of relationship paths such as: |
||
367 | * |
||
368 | * ['user', 'user.employer', 'user.employer.country', 'comments'] |
||
369 | * |
||
370 | * Returns an array with key-value pairs of top-level relationships and |
||
371 | * their nested relationships: |
||
372 | * |
||
373 | * ['user' => ['employer', 'employer.country'], 'comments' => []] |
||
374 | * |
||
375 | * @param array $paths |
||
376 | * |
||
377 | * @return array |
||
378 | */ |
||
379 | private function indexRelationshipPaths(array $paths) |
||
397 | |||
398 | /** |
||
399 | * Get the fields that should be included for resources of the given type. |
||
400 | * |
||
401 | * @param string $type |
||
402 | * |
||
403 | * @return array|null |
||
404 | */ |
||
405 | private function getFieldsForType($type) |
||
409 | } |
||
410 |
This check looks for
@param
annotations where the type inferred by our type inference engine differs from the declared type.It makes a suggestion as to what type it considers more descriptive.
Most often this is a case of a parameter that can be null in addition to its declared types.