Complex classes like Search 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 Search, and based on these observations, apply Extract Interface, too.
1 | <?php |
||
28 | class Search |
||
29 | { |
||
30 | /** |
||
31 | * @var int |
||
32 | */ |
||
33 | private $size; |
||
34 | |||
35 | /** |
||
36 | * @var int |
||
37 | */ |
||
38 | private $from; |
||
39 | |||
40 | /** |
||
41 | * @var string|null |
||
42 | */ |
||
43 | private $scroll; |
||
44 | |||
45 | /** |
||
46 | * @var array|bool|string |
||
47 | */ |
||
48 | private $source; |
||
49 | |||
50 | /** |
||
51 | * @var array |
||
52 | */ |
||
53 | private $fields; |
||
54 | |||
55 | /** |
||
56 | * @var array |
||
57 | */ |
||
58 | private $scriptFields; |
||
59 | |||
60 | /** |
||
61 | * @var string |
||
62 | */ |
||
63 | private $timeout; |
||
64 | |||
65 | /** |
||
66 | * @var string |
||
67 | */ |
||
68 | private $searchType; |
||
69 | |||
70 | /** |
||
71 | * @var bool |
||
72 | */ |
||
73 | private $explain; |
||
74 | |||
75 | /** |
||
76 | * @var array |
||
77 | */ |
||
78 | private $stats; |
||
79 | |||
80 | /** |
||
81 | * @var string[] |
||
82 | */ |
||
83 | private $preference; |
||
84 | |||
85 | /** |
||
86 | * @var float |
||
87 | */ |
||
88 | private $minScore; |
||
89 | |||
90 | /** |
||
91 | * @var OrderedSerializer |
||
92 | */ |
||
93 | private $serializer; |
||
94 | |||
95 | /** |
||
96 | * @var SearchEndpointInterface[] |
||
97 | */ |
||
98 | private $endpoints = []; |
||
99 | |||
100 | /** |
||
101 | * Initializes serializer. |
||
102 | */ |
||
103 | public function __construct() |
||
104 | { |
||
105 | $this->serializer = new OrderedSerializer( |
||
106 | [ |
||
107 | new CustomReferencedNormalizer(), |
||
108 | new CustomNormalizer(), |
||
109 | ] |
||
110 | ); |
||
111 | } |
||
112 | |||
113 | /** |
||
114 | * Adds query to search. |
||
115 | * |
||
116 | * @param BuilderInterface $query |
||
117 | * @param string $boolType |
||
118 | * |
||
119 | * @return Search |
||
120 | */ |
||
121 | public function addQuery(BuilderInterface $query, $boolType = '') |
||
122 | { |
||
123 | $this |
||
124 | ->getEndpoint('query') |
||
125 | ->addBuilder($query, ['bool_type' => $boolType]); |
||
126 | |||
127 | return $this; |
||
128 | } |
||
129 | |||
130 | /** |
||
131 | * Sets parameters for bool query. |
||
132 | * |
||
133 | * @param array $params Example values: |
||
134 | * - minimum_should_match => 1 |
||
135 | * - boost => 1. |
||
136 | * |
||
137 | * @return Search |
||
138 | */ |
||
139 | public function setBoolQueryParameters(array $params) |
||
140 | { |
||
141 | $this |
||
|
|||
142 | ->getEndpoint('query') |
||
143 | ->setParameters($params); |
||
144 | |||
145 | return $this; |
||
146 | } |
||
147 | |||
148 | /** |
||
149 | * Returns contained query. |
||
150 | * |
||
151 | * @return BuilderInterface |
||
152 | */ |
||
153 | public function getQuery() |
||
154 | { |
||
155 | return $this |
||
156 | ->getEndpoint('query') |
||
157 | ->getBuilder(); |
||
158 | } |
||
159 | |||
160 | /** |
||
161 | * Destroys query part. |
||
162 | * |
||
163 | * @return Search |
||
164 | */ |
||
165 | public function destroyQuery() |
||
166 | { |
||
167 | $this->destroyEndpoint('query'); |
||
168 | |||
169 | return $this; |
||
170 | } |
||
171 | |||
172 | /** |
||
173 | * Adds a filter to search. |
||
174 | * |
||
175 | * @param BuilderInterface $filter Filter. |
||
176 | * @param string $boolType Possible boolType values: |
||
177 | * - must |
||
178 | * - must_not |
||
179 | * - should. |
||
180 | * |
||
181 | * @return Search |
||
182 | */ |
||
183 | public function addFilter(BuilderInterface $filter, $boolType = '') |
||
184 | { |
||
185 | $this->getEndpoint('query'); |
||
186 | |||
187 | $this |
||
188 | ->getEndpoint('filter') |
||
189 | ->addBuilder($filter, ['bool_type' => $boolType]); |
||
190 | |||
191 | return $this; |
||
192 | } |
||
193 | |||
194 | /** |
||
195 | * Returns currently contained filters. |
||
196 | * |
||
197 | * @return BuilderInterface |
||
198 | */ |
||
199 | public function getFilters() |
||
200 | { |
||
201 | return $this |
||
202 | ->getEndpoint('filter') |
||
203 | ->getBuilder(); |
||
204 | } |
||
205 | |||
206 | /** |
||
207 | * Sets bool filter parameters. |
||
208 | * |
||
209 | * @param array $params Possible values: |
||
210 | * _cache => true |
||
211 | * false. |
||
212 | * |
||
213 | * @return Search |
||
214 | */ |
||
215 | public function setBoolFilterParameters($params) |
||
216 | { |
||
217 | $this |
||
218 | ->getEndpoint('filter') |
||
219 | ->setParameters($params); |
||
220 | |||
221 | return $this; |
||
222 | } |
||
223 | |||
224 | /** |
||
225 | * Destroys filter part. |
||
226 | */ |
||
227 | public function destroyFilters() |
||
231 | |||
232 | /** |
||
233 | * Adds a post filter to search. |
||
234 | * |
||
235 | * @param BuilderInterface $postFilter Post filter. |
||
236 | * @param string $boolType Possible boolType values: |
||
237 | * - must |
||
238 | * - must_not |
||
239 | * - should. |
||
240 | * |
||
241 | * @return Search |
||
242 | */ |
||
243 | public function addPostFilter(BuilderInterface $postFilter, $boolType = '') |
||
244 | { |
||
245 | $this |
||
246 | ->getEndpoint('post_filter') |
||
247 | ->addBuilder($postFilter, ['bool_type' => $boolType]); |
||
248 | |||
249 | return $this; |
||
250 | } |
||
251 | |||
252 | /** |
||
253 | * Returns all contained post filters. |
||
254 | * |
||
255 | * @return BuilderInterface |
||
256 | */ |
||
257 | public function getPostFilters() |
||
258 | { |
||
259 | return $this |
||
260 | ->getEndpoint('post_filter') |
||
261 | ->getBuilder(); |
||
262 | } |
||
263 | |||
264 | /** |
||
265 | * Sets bool post filter parameters. |
||
266 | * |
||
267 | * @param array $params Possible values: |
||
268 | * _cache => true |
||
269 | * false. |
||
270 | * |
||
271 | * @return Search |
||
272 | */ |
||
273 | public function setBoolPostFilterParameters($params) |
||
274 | { |
||
275 | $this |
||
276 | ->getEndpoint('post_filter') |
||
277 | ->setParameters($params); |
||
278 | |||
279 | return $this; |
||
280 | } |
||
281 | |||
282 | /** |
||
283 | * Returns min score value. |
||
284 | * |
||
285 | * @return float |
||
286 | */ |
||
287 | public function getMinScore() |
||
291 | |||
292 | /** |
||
293 | * Exclude documents which have a _score less than the minimum specified. |
||
294 | * |
||
295 | * @param float $minScore |
||
296 | * |
||
297 | * @return Search |
||
298 | */ |
||
299 | public function setMinScore($minScore) |
||
300 | { |
||
301 | $this->minScore = $minScore; |
||
302 | |||
303 | return $this; |
||
304 | } |
||
305 | |||
306 | /** |
||
307 | * Paginate results from. |
||
308 | * |
||
309 | * @param int $from |
||
310 | * |
||
311 | * @return Search |
||
312 | */ |
||
313 | public function setFrom($from) |
||
314 | { |
||
315 | $this->from = $from; |
||
316 | |||
317 | return $this; |
||
318 | } |
||
319 | |||
320 | /** |
||
321 | * Returns results offset value. |
||
322 | * |
||
323 | * @return int |
||
324 | */ |
||
325 | public function getFrom() |
||
329 | |||
330 | /** |
||
331 | * Set maximum number of results. |
||
332 | * |
||
333 | * @param int $size |
||
334 | * |
||
335 | * @return Search |
||
336 | */ |
||
337 | public function setSize($size) |
||
338 | { |
||
339 | $this->size = $size; |
||
340 | |||
341 | return $this; |
||
342 | } |
||
343 | |||
344 | /** |
||
345 | * Returns maximum number of results query can request. |
||
346 | * |
||
347 | * @return int |
||
348 | */ |
||
349 | public function getSize() |
||
353 | |||
354 | /** |
||
355 | * Adds sort to search. |
||
356 | * |
||
357 | * @param AbstractSort $sort |
||
358 | * |
||
359 | * @return Search |
||
360 | */ |
||
361 | public function addSort(AbstractSort $sort) |
||
362 | { |
||
363 | $this |
||
364 | ->getEndpoint('sort') |
||
365 | ->addBuilder($sort); |
||
366 | |||
367 | return $this; |
||
368 | } |
||
369 | |||
370 | /** |
||
371 | * Returns sorts object. |
||
372 | * |
||
373 | * @return Sorts |
||
374 | */ |
||
375 | public function getSorts() |
||
376 | { |
||
377 | return $this |
||
378 | ->getEndpoint('sort') |
||
379 | ->getBuilder(); |
||
380 | } |
||
381 | |||
382 | /** |
||
383 | * Allows to control how the _source field is returned with every hit. |
||
384 | * |
||
385 | * @param array|bool|string $source |
||
386 | * |
||
387 | * @return Search |
||
388 | */ |
||
389 | public function setSource($source) |
||
390 | { |
||
391 | $this->source = $source; |
||
392 | |||
393 | return $this; |
||
394 | } |
||
395 | |||
396 | /** |
||
397 | * Returns source value. |
||
398 | * |
||
399 | * @return array|bool|string |
||
400 | */ |
||
401 | public function getSource() |
||
405 | |||
406 | /** |
||
407 | * Allows to selectively load specific stored fields for each document represented by a search hit. |
||
408 | * |
||
409 | * @param array $fields |
||
410 | * |
||
411 | * @return Search |
||
412 | */ |
||
413 | public function setFields(array $fields) |
||
414 | { |
||
415 | $this->fields = $fields; |
||
416 | |||
417 | return $this; |
||
418 | } |
||
419 | |||
420 | /** |
||
421 | * Returns field value. |
||
422 | * |
||
423 | * @return array |
||
424 | */ |
||
425 | public function getFields() |
||
429 | |||
430 | /** |
||
431 | * Allows to return a script evaluation (based on different fields) for each hit. |
||
432 | * |
||
433 | * @param array $scriptFields |
||
434 | * |
||
435 | * @return Search |
||
436 | */ |
||
437 | public function setScriptFields($scriptFields) |
||
438 | { |
||
439 | $this->scriptFields = $scriptFields; |
||
440 | |||
441 | return $this; |
||
442 | } |
||
443 | |||
444 | /** |
||
445 | * Returns containing script fields. |
||
446 | * |
||
447 | * @return array |
||
448 | */ |
||
449 | public function getScriptFields() |
||
453 | |||
454 | /** |
||
455 | * Allows to highlight search results on one or more fields. |
||
456 | * |
||
457 | * @param Highlight $highlight |
||
458 | * |
||
459 | * @return Search |
||
460 | */ |
||
461 | public function setHighlight($highlight) |
||
462 | { |
||
463 | $this |
||
464 | ->getEndpoint('highlight') |
||
465 | ->addBuilder($highlight); |
||
466 | |||
467 | return $this; |
||
468 | } |
||
469 | |||
470 | /** |
||
471 | * Returns containing highlight object. |
||
472 | * |
||
473 | * @return Highlight |
||
474 | */ |
||
475 | public function getHighlight() |
||
476 | { |
||
477 | return $this |
||
478 | ->getEndpoint('highlight') |
||
479 | ->getBuilder(); |
||
480 | } |
||
481 | |||
482 | /** |
||
483 | * Sets explain property in request body search. |
||
484 | * |
||
485 | * @param bool $explain |
||
486 | * |
||
487 | * @return Search |
||
488 | */ |
||
489 | public function setExplain($explain) |
||
490 | { |
||
491 | $this->explain = $explain; |
||
492 | |||
493 | return $this; |
||
494 | } |
||
495 | |||
496 | /** |
||
497 | * Returns if explain property is set in request body search. |
||
498 | * |
||
499 | * @return bool |
||
500 | */ |
||
501 | public function isExplain() |
||
505 | |||
506 | /** |
||
507 | * Sets a stats group. |
||
508 | * |
||
509 | * @param array $stats |
||
510 | * |
||
511 | * @return Search |
||
512 | */ |
||
513 | public function setStats($stats) |
||
514 | { |
||
515 | $this->stats = $stats; |
||
516 | |||
517 | return $this; |
||
518 | } |
||
519 | |||
520 | /** |
||
521 | * Returns a stats group. |
||
522 | * |
||
523 | * @return array |
||
524 | */ |
||
525 | public function getStats() |
||
529 | |||
530 | /** |
||
531 | * Adds aggregation into search. |
||
532 | * |
||
533 | * @param AbstractAggregation $aggregation |
||
534 | * |
||
535 | * @return Search |
||
536 | */ |
||
537 | public function addAggregation(AbstractAggregation $aggregation) |
||
538 | { |
||
539 | $this |
||
540 | ->getEndpoint('aggregations') |
||
541 | ->addBuilder($aggregation); |
||
542 | |||
543 | return $this; |
||
544 | } |
||
545 | |||
546 | /** |
||
547 | * Returns contained aggregations. |
||
548 | * |
||
549 | * @return AbstractAggregation[] |
||
550 | */ |
||
551 | public function getAggregations() |
||
552 | { |
||
553 | return $this |
||
554 | ->getEndpoint('aggregations') |
||
555 | ->getBuilder(); |
||
556 | } |
||
557 | |||
558 | /** |
||
559 | * Adds suggester to search. |
||
560 | * |
||
561 | * @param AbstractSuggester $suggester |
||
562 | * |
||
563 | * @return Search |
||
564 | */ |
||
565 | public function addSuggester(AbstractSuggester $suggester) |
||
566 | { |
||
567 | $this |
||
568 | ->getEndpoint('suggest') |
||
569 | ->addBuilder($suggester); |
||
570 | |||
571 | return $this; |
||
572 | } |
||
573 | |||
574 | /** |
||
575 | * Returns all contained suggester's. |
||
576 | * |
||
577 | * @return AbstractSuggester[] |
||
578 | */ |
||
579 | public function getSuggesters() |
||
580 | { |
||
581 | return $this |
||
582 | ->getEndpoint('suggest') |
||
583 | ->getBuilder(); |
||
584 | } |
||
585 | |||
586 | /** |
||
587 | * Setter for scroll duration, effectively setting if search is scrolled or not. |
||
588 | * |
||
589 | * @param string|null $duration |
||
590 | * |
||
591 | * @return Search |
||
592 | */ |
||
593 | public function setScroll($duration = '5m') |
||
594 | { |
||
595 | $this->scroll = $duration; |
||
596 | |||
597 | return $this; |
||
598 | } |
||
599 | |||
600 | /** |
||
601 | * Returns scroll duration. |
||
602 | * |
||
603 | * @return string|null |
||
604 | */ |
||
605 | public function getScroll() |
||
609 | |||
610 | /** |
||
611 | * Set search type. |
||
612 | * |
||
613 | * @param string $searchType |
||
614 | * |
||
615 | * @return Search |
||
616 | */ |
||
617 | public function setSearchType($searchType) |
||
618 | { |
||
619 | $this->searchType = $searchType; |
||
620 | |||
621 | return $this; |
||
622 | } |
||
623 | |||
624 | /** |
||
625 | * Returns search type used. |
||
626 | * |
||
627 | * @return string |
||
628 | */ |
||
629 | public function getSearchType() |
||
633 | |||
634 | /** |
||
635 | * @return int |
||
636 | */ |
||
637 | public function getTimeout() |
||
641 | |||
642 | /** |
||
643 | * @param int $timeout |
||
644 | */ |
||
645 | public function setTimeout($timeout) |
||
649 | |||
650 | /** |
||
651 | * Setter for preference. |
||
652 | * |
||
653 | * Controls which shard replicas to execute the search request on. |
||
654 | * |
||
655 | * @param mixed $preferenceParams Possible values: |
||
656 | * _primary |
||
657 | * _primary_first |
||
658 | * _local |
||
659 | * _only_node:xyz (xyz - node id) |
||
660 | * _prefer_node:xyz (xyz - node id) |
||
661 | * _shards:2,3 (2 and 3 specified shards) |
||
662 | * custom value |
||
663 | * string[] combination of params. |
||
664 | * |
||
665 | * @return Search |
||
666 | */ |
||
667 | public function setPreference($preferenceParams) |
||
679 | |||
680 | /** |
||
681 | * Returns preference params as string. |
||
682 | * |
||
683 | * @return string |
||
684 | */ |
||
685 | public function getPreference() |
||
689 | |||
690 | /** |
||
691 | * Returns query url parameters. |
||
692 | * |
||
693 | * @return array |
||
694 | */ |
||
695 | public function getQueryParams() |
||
696 | { |
||
697 | return array_filter( |
||
698 | [ |
||
699 | 'scroll' => $this->getScroll(), |
||
700 | 'timeout' => $this->getTimeout(), |
||
701 | 'search_type' => $this->getSearchType(), |
||
702 | 'preference' => $this->getPreference(), |
||
703 | ] |
||
704 | ); |
||
705 | } |
||
706 | |||
707 | /** |
||
708 | * {@inheritdoc} |
||
709 | */ |
||
710 | public function toArray() |
||
711 | { |
||
712 | $output = array_filter($this->serializer->normalize($this->endpoints)); |
||
713 | |||
714 | $params = [ |
||
715 | 'from' => 'from', |
||
716 | 'size' => 'size', |
||
717 | 'fields' => 'fields', |
||
718 | 'scriptFields' => 'script_fields', |
||
719 | 'explain' => 'explain', |
||
720 | 'stats' => 'stats', |
||
721 | 'minScore' => 'min_score', |
||
722 | 'source' => '_source', |
||
723 | ]; |
||
724 | |||
725 | foreach ($params as $field => $param) { |
||
726 | if ($this->$field !== null) { |
||
727 | $output[$param] = $this->$field; |
||
728 | } |
||
729 | } |
||
730 | |||
731 | return $output; |
||
732 | } |
||
733 | |||
734 | /** |
||
735 | * Returns endpoint instance. |
||
736 | * |
||
737 | * @param string $type Endpoint type. |
||
738 | * |
||
739 | * @return SearchEndpointInterface |
||
740 | */ |
||
741 | private function getEndpoint($type) |
||
742 | { |
||
743 | if (!array_key_exists($type, $this->endpoints)) { |
||
744 | $this->endpoints[$type] = SearchEndpointFactory::get($type); |
||
745 | } |
||
746 | |||
747 | return $this->endpoints[$type]; |
||
748 | } |
||
749 | |||
750 | /** |
||
751 | * Destroys search endpoint. |
||
752 | * |
||
753 | * @param string $type Endpoint type. |
||
754 | */ |
||
755 | private function destroyEndpoint($type) |
||
759 | } |
||
760 |
Let’s take a look at an example:
In the above example, the authenticate() method works fine as long as you just pass instances of MyUser. However, if you now also want to pass a different implementation of User which does not have a getDisplayName() method, the code will break.
Available Fixes
Change the type-hint for the parameter:
Add an additional type-check:
Add the method to the interface: