Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/content_translation/src/ContentTranslationHandlerInterface.php

@@ -0,0 +1,79 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\content_translation\ContentTranslationHandlerInterface.
+ */
+
+namespace Drupal\content_translation;
+
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Interface for providing content translation.
+ *
+ * Defines a set of methods to allow any entity to be processed by the entity
+ * translation UI.
+ */
+interface ContentTranslationHandlerInterface {
+
+  /**
+   * Returns a set of field definitions to be used to store metadata items.
+   *
+   * @return \Drupal\Core\Field\FieldDefinitionInterface[]
+   */
+  public function getFieldDefinitions();
+
+  /**
+   * Checks if the user can perform the given operation on translations of the
+   * wrapped entity.
+   *
+   * @param \Drupal\Core\Entity\EntityInterface $entity
+   *   The entity whose translation has to be accessed.
+   * @param $op
+   *   The operation to be performed on the translation. Possible values are:
+   *   - "create"
+   *   - "update"
+   *   - "delete"
+   *
+   * @return \Drupal\Core\Access\AccessResultInterface
+   *   The access result.
+   */
+  public function getTranslationAccess(EntityInterface $entity, $op);
+
+  /**
+   * Retrieves the source language for the translation being created.
+   *
+   * @param \Drupal\Core\Form\FormStateInterface $form_state
+   *   The current state of the form.
+   *
+   * @return string
+   *   The source language code.
+   */
+  public function getSourceLangcode(FormStateInterface $form_state);
+
+  /**
+   * Marks translations as outdated.
+   *
+   * @param \Drupal\Core\Entity\EntityInterface $entity
+   *   The entity being translated.
+   * @param string $langcode
+   *   (optional) The language code of the updated language: all the other
+   *   translations will be marked as outdated. Defaults to the entity language.
+   */
+  public function retranslate(EntityInterface $entity, $langcode = NULL);
+
+  /**
+   * Performs the needed alterations to the entity form.
+   *
+   * @param array $form
+   *   The entity form to be altered to provide the translation workflow.
+   * @param \Drupal\Core\Form\FormStateInterface $form_state
+   *   The current state of the form.
+   * @param \Drupal\Core\Entity\EntityInterface $entity
+   *   The entity being created or edited.
+   */
+  public function entityFormAlter(array &$form, FormStateInterface $form_state, EntityInterface $entity);
+
+}