diff core/modules/jsonapi/src/Revisions/VersionByRel.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/Revisions/VersionByRel.php	Thu May 09 15:34:47 2019 +0100
@@ -0,0 +1,66 @@
+<?php
+
+namespace Drupal\jsonapi\Revisions;
+
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Entity\RevisionableInterface;
+
+/**
+ * Revision ID implementation for the default or latest revisions.
+ *
+ * @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 VersionByRel extends NegotiatorBase {
+
+  /**
+   * Version argument which loads the revision known to be the "working copy".
+   *
+   * In Drupal terms, a "working copy" is the latest revision. It may or may not
+   * be a "default" revision. This revision is the working copy because it is
+   * the revision to which new work will be applied. In other words, it denotes
+   * the most recent revision which might be considered a work-in-progress.
+   *
+   * @var string
+   */
+  const WORKING_COPY = 'working-copy';
+
+  /**
+   * Version argument which loads the revision known to be the "latest version".
+   *
+   * In Drupal terms, the "latest version" is the latest "default" revision. It
+   * may or may not have later revisions after it, as long as none of them are
+   * "default" revisions. This revision is the latest version because it is the
+   * last revision where work was considered finished. Typically, this means
+   * that it is the most recent "published" revision.
+   *
+   * @var string
+   */
+  const LATEST_VERSION = 'latest-version';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function getRevisionId(EntityInterface $entity, $version_argument) {
+    assert($entity instanceof RevisionableInterface);
+    switch ($version_argument) {
+      case static::WORKING_COPY:
+        /* @var \Drupal\Core\Entity\RevisionableStorageInterface $entity_storage */
+        $entity_storage = $this->entityTypeManager->getStorage($entity->getEntityTypeId());
+        return static::ensureVersionExists($entity_storage->getLatestRevisionId($entity->id()));
+
+      case static::LATEST_VERSION:
+        // The already loaded revision will be the latest version by default.
+        // @see \Drupal\Core\Entity\Sql\SqlContentEntityStorage::buildQuery().
+        return $entity->getLoadedRevisionId();
+
+      default:
+        $message = sprintf('The version specifier must be either `%s` or `%s`, `%s` given.', static::LATEST_VERSION, static::WORKING_COPY, $version_argument);
+        throw new InvalidVersionIdentifierException($message);
+    }
+  }
+
+}