class OffsetPage in Drupal 8

Value object for containing the requested offset and page parameters.

@internal JSON:API maintains no PHP API since its API is the HTTP API. This class may change at any time and this will break any dependencies on it.

Hierarchy

• class \Drupal\jsonapi\Query\OffsetPage

See also

https://www.drupal.org/project/drupal/issues/3032787

jsonapi.api.php

3 files declare their use of OffsetPage

EntityResource.php in core/modules/jsonapi/src/Controller/EntityResource.php

JsonApiFunctionalTest.php in core/modules/jsonapi/tests/src/Functional/JsonApiFunctionalTest.php

OffsetPageTest.php in core/modules/jsonapi/tests/src/Unit/Query/OffsetPageTest.php

File

core/modules/jsonapi/src/Query/OffsetPage.php, line 17

Namespace

Drupal\jsonapi\Query

class OffsetPage {

  /**
   * The JSON:API pagination key name.
   *
   * @var string
   */
  const KEY_NAME = 'page';

  /**
   * The offset key in the page parameter: page[offset].
   *
   * @var string
   */
  const OFFSET_KEY = 'offset';

  /**
   * The size key in the page parameter: page[limit].
   *
   * @var string
   */
  const SIZE_KEY = 'limit';

  /**
   * Default offset.
   *
   * @var int
   */
  const DEFAULT_OFFSET = 0;

  /**
   * Max size.
   *
   * @var int
   */
  const SIZE_MAX = 50;

  /**
   * The offset for the query.
   *
   * @var int
   */
  protected $offset;

  /**
   * The size of the query.
   *
   * @var int
   */
  protected $size;

  /**
   * Instantiates an OffsetPage object.
   *
   * @param int $offset
   *   The query offset.
   * @param int $size
   *   The query size limit.
   */
  public function __construct($offset, $size) {
    $this->offset = $offset;
    $this->size = $size;
  }

  /**
   * Returns the current offset.
   *
   * @return int
   *   The query offset.
   */
  public function getOffset() {
    return $this->offset;
  }

  /**
   * Returns the page size.
   *
   * @return int
   *   The requested size of the query result.
   */
  public function getSize() {
    return $this->size;
  }

  /**
   * Creates an OffsetPage object from a query parameter.
   *
   * @param mixed $parameter
   *   The `page` query parameter from the Symfony request object.
   *
   * @return static
   *   An OffsetPage object with defaults.
   */
  public static function createFromQueryParameter($parameter) {
    if (!is_array($parameter)) {
      $cacheability = (new CacheableMetadata())
        ->addCacheContexts([
        'url.query_args:page',
      ]);
      throw new CacheableBadRequestHttpException($cacheability, 'The page parameter needs to be an array.');
    }
    $expanded = $parameter + [
      static::OFFSET_KEY => static::DEFAULT_OFFSET,
      static::SIZE_KEY => static::SIZE_MAX,
    ];
    if ($expanded[static::SIZE_KEY] > static::SIZE_MAX) {
      $expanded[static::SIZE_KEY] = static::SIZE_MAX;
    }
    return new static($expanded[static::OFFSET_KEY], $expanded[static::SIZE_KEY]);
  }

}

Members

Name	Modifiers	Type	Description	Overrides
OffsetPage::$offset	protected	property	The offset for the query.
OffsetPage::$size	protected	property	The size of the query.
OffsetPage::createFromQueryParameter	public static	function	Creates an OffsetPage object from a query parameter.
OffsetPage::DEFAULT_OFFSET		constant	Default offset.
OffsetPage::getOffset	public	function	Returns the current offset.
OffsetPage::getSize	public	function	Returns the page size.
OffsetPage::KEY_NAME		constant	The JSON:API pagination key name.
OffsetPage::OFFSET_KEY		constant	The offset key in the page parameter: page[offset].
OffsetPage::SIZE_KEY		constant	The size key in the page parameter: page[limit].
OffsetPage::SIZE_MAX		constant	Max size.
OffsetPage::__construct	public	function	Instantiates an OffsetPage object.