Total Complexity | 52 |
Total Lines | 239 |
Duplicated Lines | 0 % |
Changes | 1 | ||
Bugs | 0 | Features | 0 |
Complex classes like Pagination 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.
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 Pagination, and based on these observations, apply Extract Interface, too.
1 | <?php |
||
25 | final class Pagination |
||
26 | { |
||
27 | private $options; |
||
28 | private $graphQlOptions; |
||
29 | private $resourceMetadataFactory; |
||
30 | |||
31 | public function __construct(ResourceMetadataFactoryInterface $resourceMetadataFactory, array $options = [], array $graphQlOptions = []) |
||
32 | { |
||
33 | $this->resourceMetadataFactory = $resourceMetadataFactory; |
||
34 | $this->options = array_merge([ |
||
35 | 'enabled' => true, |
||
36 | 'client_enabled' => false, |
||
37 | 'client_items_per_page' => false, |
||
38 | 'items_per_page' => 30, |
||
39 | 'page_default' => 1, |
||
40 | 'page_parameter_name' => 'page', |
||
41 | 'enabled_parameter_name' => 'pagination', |
||
42 | 'items_per_page_parameter_name' => 'itemsPerPage', |
||
43 | 'maximum_items_per_page' => null, |
||
44 | 'partial' => false, |
||
45 | 'client_partial' => false, |
||
46 | 'partial_parameter_name' => 'partial', |
||
47 | ], $options); |
||
48 | $this->graphQlOptions = array_merge([ |
||
49 | 'enabled' => true, |
||
50 | ], $graphQlOptions); |
||
51 | } |
||
52 | |||
53 | /** |
||
54 | * Gets the current page. |
||
55 | * |
||
56 | * @throws InvalidArgumentException |
||
57 | */ |
||
58 | public function getPage(array $context = []): int |
||
59 | { |
||
60 | $page = (int) $this->getParameterFromContext( |
||
61 | $context, |
||
62 | $this->options['page_parameter_name'], |
||
63 | $this->options['page_default'] |
||
64 | ); |
||
65 | |||
66 | if (1 > $page) { |
||
67 | throw new InvalidArgumentException('Page should not be less than 1'); |
||
68 | } |
||
69 | |||
70 | return $page; |
||
71 | } |
||
72 | |||
73 | /** |
||
74 | * Gets the current offset. |
||
75 | */ |
||
76 | public function getOffset(string $resourceClass = null, string $operationName = null, array $context = []): int |
||
77 | { |
||
78 | $graphql = (bool) ($context['graphql_operation_name'] ?? false); |
||
79 | |||
80 | $limit = $this->getLimit($resourceClass, $operationName, $context); |
||
81 | |||
82 | if ($graphql && null !== ($after = $this->getParameterFromContext($context, 'after'))) { |
||
83 | return false === ($after = base64_decode($after, true)) ? 0 : (int) $after + 1; |
||
84 | } |
||
85 | |||
86 | if ($graphql && null !== ($before = $this->getParameterFromContext($context, 'before'))) { |
||
87 | return ($offset = (false === ($before = base64_decode($before, true)) ? 0 : (int) $before - $limit)) < 0 ? 0 : $offset; |
||
88 | } |
||
89 | |||
90 | if ($graphql && null !== ($last = $this->getParameterFromContext($context, 'last'))) { |
||
91 | return ($offset = ($context['count'] ?? 0) - $last) < 0 ? 0 : $offset; |
||
92 | } |
||
93 | |||
94 | return ($this->getPage($context) - 1) * $limit; |
||
95 | } |
||
96 | |||
97 | /** |
||
98 | * Gets the current limit. |
||
99 | * |
||
100 | * @throws InvalidArgumentException |
||
101 | */ |
||
102 | public function getLimit(string $resourceClass = null, string $operationName = null, array $context = []): int |
||
103 | { |
||
104 | $graphql = (bool) ($context['graphql_operation_name'] ?? false); |
||
105 | |||
106 | $limit = $this->options['items_per_page']; |
||
107 | $clientLimit = $this->options['client_items_per_page']; |
||
108 | |||
109 | if (null !== $resourceClass) { |
||
110 | $resourceMetadata = $this->resourceMetadataFactory->create($resourceClass); |
||
111 | $limit = $resourceMetadata->getCollectionOperationAttribute($operationName, 'pagination_items_per_page', $limit, true); |
||
112 | $clientLimit = $resourceMetadata->getCollectionOperationAttribute($operationName, 'pagination_client_items_per_page', $clientLimit, true); |
||
113 | } |
||
114 | |||
115 | if ($graphql && null !== ($first = $this->getParameterFromContext($context, 'first'))) { |
||
116 | $limit = $first; |
||
117 | } |
||
118 | |||
119 | if ($graphql && null !== ($last = $this->getParameterFromContext($context, 'last'))) { |
||
120 | $limit = $last; |
||
121 | } |
||
122 | |||
123 | if ($graphql && null !== ($before = $this->getParameterFromContext($context, 'before')) |
||
124 | && (false === ($before = base64_decode($before, true)) ? 0 : (int) $before - $limit) < 0) { |
||
125 | $limit = (int) $before; |
||
126 | } |
||
127 | |||
128 | if ($clientLimit) { |
||
129 | $limit = (int) $this->getParameterFromContext($context, $this->options['items_per_page_parameter_name'], $limit); |
||
130 | $maxItemsPerPage = null; |
||
131 | |||
132 | if (null !== $resourceClass) { |
||
133 | $resourceMetadata = $this->resourceMetadataFactory->create($resourceClass); |
||
134 | $maxItemsPerPage = $resourceMetadata->getCollectionOperationAttribute($operationName, 'maximum_items_per_page', null, true); |
||
135 | if (null !== $maxItemsPerPage) { |
||
136 | @trigger_error('The "maximum_items_per_page" option has been deprecated since API Platform 2.5 in favor of "pagination_maximum_items_per_page" and will be removed in API Platform 3.', E_USER_DEPRECATED); |
||
137 | } |
||
138 | $maxItemsPerPage = $resourceMetadata->getCollectionOperationAttribute($operationName, 'pagination_maximum_items_per_page', $maxItemsPerPage ?? $this->options['maximum_items_per_page'], true); |
||
139 | } |
||
140 | |||
141 | if (null !== $maxItemsPerPage && $limit > $maxItemsPerPage) { |
||
142 | $limit = $maxItemsPerPage; |
||
143 | } |
||
144 | } |
||
145 | |||
146 | if (0 > $limit) { |
||
147 | throw new InvalidArgumentException('Limit should not be less than 0'); |
||
148 | } |
||
149 | |||
150 | return $limit; |
||
151 | } |
||
152 | |||
153 | /** |
||
154 | * Gets info about the pagination. |
||
155 | * |
||
156 | * Returns an array with the following info as values: |
||
157 | * - the page {@see Pagination::getPage()} |
||
158 | * - the offset {@see Pagination::getOffset()} |
||
159 | * - the limit {@see Pagination::getLimit()} |
||
160 | * |
||
161 | * @throws InvalidArgumentException |
||
162 | */ |
||
163 | public function getPagination(string $resourceClass = null, string $operationName = null, array $context = []): array |
||
164 | { |
||
165 | $page = $this->getPage($context); |
||
166 | $limit = $this->getLimit($resourceClass, $operationName, $context); |
||
167 | |||
168 | if (0 === $limit && 1 < $page) { |
||
169 | throw new InvalidArgumentException('Page should not be greater than 1 if limit is equal to 0'); |
||
170 | } |
||
171 | |||
172 | return [$page, $this->getOffset($resourceClass, $operationName, $context), $limit]; |
||
173 | } |
||
174 | |||
175 | /** |
||
176 | * Is the pagination enabled? |
||
177 | */ |
||
178 | public function isEnabled(string $resourceClass = null, string $operationName = null, array $context = []): bool |
||
179 | { |
||
180 | return $this->getEnabled($context, $resourceClass, $operationName); |
||
181 | } |
||
182 | |||
183 | /** |
||
184 | * Is the pagination enabled for GraphQL? |
||
185 | */ |
||
186 | public function isGraphQlEnabled(?string $resourceClass = null, ?string $operationName = null, array $context = []): bool |
||
189 | } |
||
190 | |||
191 | /** |
||
192 | * Is the partial pagination enabled? |
||
193 | */ |
||
194 | public function isPartialEnabled(string $resourceClass = null, string $operationName = null, array $context = []): bool |
||
197 | } |
||
198 | |||
199 | public function getOptions(): array |
||
202 | } |
||
203 | |||
204 | public function getGraphQlPaginationType(string $resourceClass, string $operationName): string |
||
213 | } |
||
214 | |||
215 | /** |
||
216 | * Is the classic or partial pagination enabled? |
||
217 | */ |
||
218 | private function getEnabled(array $context, string $resourceClass = null, string $operationName = null, bool $partial = false): bool |
||
219 | { |
||
220 | $enabled = $this->options[$partial ? 'partial' : 'enabled']; |
||
221 | $clientEnabled = $this->options[$partial ? 'client_partial' : 'client_enabled']; |
||
222 | |||
223 | if (null !== $resourceClass) { |
||
224 | $resourceMetadata = $this->resourceMetadataFactory->create($resourceClass); |
||
225 | $enabled = $resourceMetadata->getCollectionOperationAttribute($operationName, $partial ? 'pagination_partial' : 'pagination_enabled', $enabled, true); |
||
226 | |||
227 | $clientEnabled = $resourceMetadata->getCollectionOperationAttribute($operationName, $partial ? 'pagination_client_partial' : 'pagination_client_enabled', $clientEnabled, true); |
||
228 | } |
||
229 | |||
230 | if ($clientEnabled) { |
||
231 | return filter_var($this->getParameterFromContext($context, $this->options[$partial ? 'partial_parameter_name' : 'enabled_parameter_name'], $enabled), FILTER_VALIDATE_BOOLEAN); |
||
232 | } |
||
233 | |||
234 | return (bool) $enabled; |
||
235 | } |
||
236 | |||
237 | private function getGraphQlEnabled(?string $resourceClass, ?string $operationName): bool |
||
238 | { |
||
239 | $enabled = $this->graphQlOptions['enabled']; |
||
240 | |||
241 | if (null !== $resourceClass) { |
||
242 | try { |
||
243 | $resourceMetadata = $this->resourceMetadataFactory->create($resourceClass); |
||
244 | } catch (ResourceClassNotFoundException $e) { |
||
245 | return $enabled; |
||
246 | } |
||
247 | |||
248 | return (bool) $resourceMetadata->getGraphqlAttribute($operationName, 'pagination_enabled', $enabled, true); |
||
249 | } |
||
250 | |||
251 | return $enabled; |
||
252 | } |
||
253 | |||
254 | /** |
||
255 | * Gets the given pagination parameter name from the given context. |
||
256 | * |
||
257 | * @param mixed|null $default |
||
258 | */ |
||
259 | private function getParameterFromContext(array $context, string $parameterName, $default = null) |
||
264 | } |
||
265 | } |
||
266 |
This check looks for parameters that have been defined for a function or method, but which are not used in the method body.