diff core/modules/jsonapi/src/Query/OffsetPage.php @ 5:12f9dff5fda9 tip

Update to Drupal core 8.7.1

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/modules/jsonapi/src/Query/OffsetPage.php	Thu May 09 15:34:47 2019 +0100
@@ -0,0 +1,128 @@
+<?php
+
+namespace Drupal\jsonapi\Query;
+
+use Drupal\Core\Cache\CacheableMetadata;
+use Drupal\Core\Http\Exception\CacheableBadRequestHttpException;
+
+/**
+ * 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.
+ *
+ * @see https://www.drupal.org/project/jsonapi/issues/3032787
+ * @see jsonapi.api.php
+ */
+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 $parameter
+   *   The `page` query parameter from the Symfony request object.
+   *
+   * @return \Drupal\jsonapi\Query\OffsetPage
+   *   An OffsetPage object with defaults.
+   */
+  public static function createFromQueryParameter($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]);
+  }
+
+}