api-platform /
core
| Total Complexity | 51 |
| Total Lines | 235 |
| Duplicated Lines | 0 % |
| Changes | 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 |
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| 25 | final class Pagination |
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| 26 | { |
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| 27 | private $options; |
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| 28 | private $graphQlOptions; |
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| 29 | private $resourceMetadataFactory; |
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| 30 | |||
| 31 | public function __construct(ResourceMetadataFactoryInterface $resourceMetadataFactory, array $options = [], array $graphQlOptions = []) |
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| 32 | { |
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| 33 | $this->resourceMetadataFactory = $resourceMetadataFactory; |
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| 34 | $this->options = array_merge([ |
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| 35 | 'enabled' => true, |
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| 36 | 'client_enabled' => false, |
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| 37 | 'client_items_per_page' => false, |
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| 38 | 'items_per_page' => 30, |
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| 39 | 'page_default' => 1, |
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| 40 | 'page_parameter_name' => 'page', |
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| 41 | 'enabled_parameter_name' => 'pagination', |
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| 42 | 'items_per_page_parameter_name' => 'itemsPerPage', |
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| 43 | 'maximum_items_per_page' => null, |
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| 44 | 'partial' => false, |
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| 45 | 'client_partial' => false, |
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| 46 | 'partial_parameter_name' => 'partial', |
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| 47 | ], $options); |
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| 48 | $this->graphQlOptions = array_merge([ |
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| 49 | 'enabled' => true, |
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| 50 | ], $graphQlOptions); |
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| 51 | } |
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| 52 | |||
| 53 | /** |
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| 54 | * Gets the current page. |
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| 55 | * |
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| 56 | * @throws InvalidArgumentException |
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| 57 | */ |
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| 58 | public function getPage(array $context = []): int |
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| 59 | { |
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| 60 | $page = (int) $this->getParameterFromContext( |
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| 61 | $context, |
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| 62 | $this->options['page_parameter_name'], |
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| 63 | $this->options['page_default'] |
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| 64 | ); |
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| 65 | |||
| 66 | if (1 > $page) { |
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| 67 | throw new InvalidArgumentException('Page should not be less than 1'); |
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| 68 | } |
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| 69 | |||
| 70 | return $page; |
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| 71 | } |
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| 72 | |||
| 73 | /** |
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| 74 | * Gets the current offset. |
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| 75 | */ |
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| 76 | public function getOffset(string $resourceClass = null, string $operationName = null, array $context = []): int |
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| 77 | { |
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| 78 | $graphql = (bool) ($context['graphql_operation_name'] ?? false); |
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| 79 | |||
| 80 | $limit = $this->getLimit($resourceClass, $operationName, $context); |
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| 81 | |||
| 82 | if ($graphql && null !== ($after = $this->getParameterFromContext($context, 'after'))) { |
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| 83 | return false === ($after = base64_decode($after, true)) ? 0 : (int) $after + 1; |
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| 84 | } |
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| 85 | |||
| 86 | if ($graphql && null !== ($before = $this->getParameterFromContext($context, 'before'))) { |
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| 87 | return ($offset = (false === ($before = base64_decode($before, true)) ? 0 : (int) $before - $limit)) < 0 ? 0 : $offset; |
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| 88 | } |
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| 89 | |||
| 90 | if ($graphql && null !== ($last = $this->getParameterFromContext($context, 'last'))) { |
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| 91 | return ($offset = ($context['count'] ?? 0) - $last) < 0 ? 0 : $offset; |
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| 92 | } |
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| 93 | |||
| 94 | return ($this->getPage($context) - 1) * $limit; |
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| 95 | } |
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| 96 | |||
| 97 | /** |
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| 98 | * Gets the current limit. |
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| 99 | * |
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| 100 | * @throws InvalidArgumentException |
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| 101 | */ |
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| 102 | public function getLimit(string $resourceClass = null, string $operationName = null, array $context = []): int |
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| 103 | { |
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| 104 | $graphql = (bool) ($context['graphql_operation_name'] ?? false); |
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| 105 | |||
| 106 | $limit = $this->options['items_per_page']; |
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| 107 | $clientLimit = $this->options['client_items_per_page']; |
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| 108 | |||
| 109 | if (null !== $resourceClass) { |
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| 110 | $resourceMetadata = $this->resourceMetadataFactory->create($resourceClass); |
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| 111 | $limit = $resourceMetadata->getCollectionOperationAttribute($operationName, 'pagination_items_per_page', $limit, true); |
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| 112 | $clientLimit = $resourceMetadata->getCollectionOperationAttribute($operationName, 'pagination_client_items_per_page', $clientLimit, true); |
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| 113 | } |
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| 114 | |||
| 115 | if ($graphql && null !== ($first = $this->getParameterFromContext($context, 'first'))) { |
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| 116 | $limit = $first; |
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| 117 | } |
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| 118 | |||
| 119 | if ($graphql && null !== ($last = $this->getParameterFromContext($context, 'last'))) { |
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| 120 | $limit = $last; |
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| 121 | } |
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| 122 | |||
| 123 | if ($graphql && null !== ($before = $this->getParameterFromContext($context, 'before')) |
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| 124 | && (false === ($before = base64_decode($before, true)) ? 0 : (int) $before - $limit) < 0) { |
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| 125 | $limit = (int) $before; |
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| 126 | } |
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| 127 | |||
| 128 | if ($clientLimit) { |
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| 129 | $limit = (int) $this->getParameterFromContext($context, $this->options['items_per_page_parameter_name'], $limit); |
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| 130 | $maxItemsPerPage = null; |
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| 131 | |||
| 132 | if (null !== $resourceClass) { |
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| 133 | $resourceMetadata = $this->resourceMetadataFactory->create($resourceClass); |
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| 134 | $maxItemsPerPage = $resourceMetadata->getCollectionOperationAttribute($operationName, 'maximum_items_per_page', null, true); |
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| 135 | if (null !== $maxItemsPerPage) { |
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| 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); |
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| 137 | } |
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| 138 | $maxItemsPerPage = $resourceMetadata->getCollectionOperationAttribute($operationName, 'pagination_maximum_items_per_page', $maxItemsPerPage ?? $this->options['maximum_items_per_page'], true); |
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| 139 | } |
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| 140 | |||
| 141 | if (null !== $maxItemsPerPage && $limit > $maxItemsPerPage) { |
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| 142 | $limit = $maxItemsPerPage; |
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| 143 | } |
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| 144 | } |
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| 145 | |||
| 146 | if (0 > $limit) { |
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| 147 | throw new InvalidArgumentException('Limit should not be less than 0'); |
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| 148 | } |
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| 149 | |||
| 150 | return $limit; |
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| 151 | } |
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| 152 | |||
| 153 | /** |
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| 154 | * Gets info about the pagination. |
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| 155 | * |
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| 156 | * Returns an array with the following info as values: |
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| 157 | * - the page {@see Pagination::getPage()} |
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| 158 | * - the offset {@see Pagination::getOffset()} |
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| 159 | * - the limit {@see Pagination::getLimit()} |
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| 160 | * |
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| 161 | * @throws InvalidArgumentException |
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| 162 | */ |
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| 163 | public function getPagination(string $resourceClass = null, string $operationName = null, array $context = []): array |
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| 164 | { |
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| 165 | $page = $this->getPage($context); |
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| 166 | $limit = $this->getLimit($resourceClass, $operationName, $context); |
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| 167 | |||
| 168 | if (0 === $limit && 1 < $page) { |
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| 169 | throw new InvalidArgumentException('Page should not be greater than 1 if limit is equal to 0'); |
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| 170 | } |
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| 171 | |||
| 172 | return [$page, $this->getOffset($resourceClass, $operationName, $context), $limit]; |
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| 173 | } |
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| 174 | |||
| 175 | /** |
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| 176 | * Is the pagination enabled? |
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| 177 | */ |
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| 178 | public function isEnabled(string $resourceClass = null, string $operationName = null, array $context = []): bool |
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| 179 | { |
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| 180 | return $this->getEnabled($context, $resourceClass, $operationName); |
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| 181 | } |
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| 182 | |||
| 183 | /** |
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| 184 | * Is the pagination enabled for GraphQL? |
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| 185 | */ |
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| 186 | public function isGraphQlEnabled(?string $resourceClass = null, ?string $operationName = null, array $context = []): bool |
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| 189 | } |
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| 190 | |||
| 191 | /** |
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| 192 | * Is the partial pagination enabled? |
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| 193 | */ |
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| 194 | public function isPartialEnabled(string $resourceClass = null, string $operationName = null, array $context = []): bool |
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| 197 | } |
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| 198 | |||
| 199 | public function getOptions(): array |
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| 200 | { |
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| 201 | return $this->options; |
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| 202 | } |
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| 203 | |||
| 204 | public function getGraphQlPaginationType(string $resourceClass, string $operationName): string |
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| 209 | } |
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| 210 | |||
| 211 | /** |
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| 212 | * Is the classic or partial pagination enabled? |
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| 213 | */ |
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| 214 | private function getEnabled(array $context, string $resourceClass = null, string $operationName = null, bool $partial = false): bool |
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| 215 | { |
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| 216 | $enabled = $this->options[$partial ? 'partial' : 'enabled']; |
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| 217 | $clientEnabled = $this->options[$partial ? 'client_partial' : 'client_enabled']; |
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| 218 | |||
| 219 | if (null !== $resourceClass) { |
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| 220 | $resourceMetadata = $this->resourceMetadataFactory->create($resourceClass); |
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| 221 | $enabled = $resourceMetadata->getCollectionOperationAttribute($operationName, $partial ? 'pagination_partial' : 'pagination_enabled', $enabled, true); |
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| 222 | |||
| 223 | $clientEnabled = $resourceMetadata->getCollectionOperationAttribute($operationName, $partial ? 'pagination_client_partial' : 'pagination_client_enabled', $clientEnabled, true); |
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| 224 | } |
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| 225 | |||
| 226 | if ($clientEnabled) { |
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| 227 | return filter_var($this->getParameterFromContext($context, $this->options[$partial ? 'partial_parameter_name' : 'enabled_parameter_name'], $enabled), FILTER_VALIDATE_BOOLEAN); |
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| 228 | } |
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| 229 | |||
| 230 | return (bool) $enabled; |
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| 231 | } |
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| 232 | |||
| 233 | private function getGraphQlEnabled(?string $resourceClass, ?string $operationName): bool |
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| 234 | { |
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| 235 | $enabled = $this->graphQlOptions['enabled']; |
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| 236 | |||
| 237 | if (null !== $resourceClass) { |
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| 238 | try { |
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| 239 | $resourceMetadata = $this->resourceMetadataFactory->create($resourceClass); |
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| 240 | } catch (ResourceClassNotFoundException $e) { |
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| 241 | return $enabled; |
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| 242 | } |
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| 243 | |||
| 244 | return (bool) $resourceMetadata->getGraphqlAttribute($operationName, 'pagination_enabled', $enabled, true); |
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| 245 | } |
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| 246 | |||
| 247 | return $enabled; |
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| 248 | } |
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| 249 | |||
| 250 | /** |
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| 251 | * Gets the given pagination parameter name from the given context. |
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| 252 | * |
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| 253 | * @param mixed|null $default |
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| 254 | */ |
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| 255 | private function getParameterFromContext(array $context, string $parameterName, $default = null) |
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| 260 | } |
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| 261 | } |
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| 262 |
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