interface ModerationInformationInterface

interface ModerationInformationInterface {
    
    /**
     * Determines if an entity is moderated.
     *
     * @param \Drupal\Core\Entity\EntityInterface $entity
     *   The entity we may be moderating.
     *
     * @return bool
     *   TRUE if this entity is moderated, FALSE otherwise.
     */
    public function isModeratedEntity(EntityInterface $entity);
    
    /**
     * Determines if an entity type can have moderated entities.
     *
     * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
     *   An entity type object.
     *
     * @return bool
     *   TRUE if this entity type can have moderated entities, FALSE otherwise.
     */
    public function canModerateEntitiesOfEntityType(EntityTypeInterface $entity_type);
    
    /**
     * Determines if an entity type/bundle entities should be moderated.
     *
     * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
     *   The entity type definition to check.
     * @param string $bundle
     *   The bundle to check.
     *
     * @return bool
     *   TRUE if an entity type/bundle entities should be moderated, FALSE
     *   otherwise.
     */
    public function shouldModerateEntitiesOfBundle(EntityTypeInterface $entity_type, $bundle);
    
    /**
     * Determines if an entity type has at least one moderated bundle.
     *
     * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
     *   The entity type definition to check.
     *
     * @return bool
     *   TRUE if an entity type has a moderated bundle, FALSE otherwise.
     */
    public function isModeratedEntityType(EntityTypeInterface $entity_type);
    
    /**
     * Returns the revision ID of the default revision for the specified entity.
     *
     * @param string $entity_type_id
     *   The entity type ID.
     * @param int $entity_id
     *   The entity ID.
     *
     * @return int
     *   The revision ID of the default revision, or NULL if the entity was
     *   not found.
     */
    public function getDefaultRevisionId($entity_type_id, $entity_id);
    
    /**
     * Returns the revision translation affected translation of a revision.
     *
     * @param \Drupal\Core\Entity\ContentEntityInterface $entity
     *   The content entity.
     *
     * @return \Drupal\Core\Entity\ContentEntityInterface
     *   The revision translation affected translation.
     */
    public function getAffectedRevisionTranslation(ContentEntityInterface $entity);
    
    /**
     * Determines if a pending revision exists for the specified entity.
     *
     * @param \Drupal\Core\Entity\ContentEntityInterface $entity
     *   The entity which may or may not have a pending revision.
     *
     * @return bool
     *   TRUE if this entity has pending revisions available, FALSE otherwise.
     */
    public function hasPendingRevision(ContentEntityInterface $entity);
    
    /**
     * Determines if an entity is "live".
     *
     * A "live" entity revision is one whose latest revision is also the default,
     * and whose moderation state, if any, is a published state.
     *
     * @param \Drupal\Core\Entity\ContentEntityInterface $entity
     *   The entity to check.
     *
     * @return bool
     *   TRUE if the specified entity is a live revision, FALSE otherwise.
     */
    public function isLiveRevision(ContentEntityInterface $entity);
    
    /**
     * Determines if the default revision for the given entity is published.
     *
     * The default revision is the same as the entity retrieved by "default" from
     * the storage handler. If the entity is translated, check if any of the
     * translations are published.
     *
     * @param \Drupal\Core\Entity\ContentEntityInterface $entity
     *   The entity being saved.
     *
     * @return bool
     *   TRUE if the default revision is published. FALSE otherwise.
     */
    public function isDefaultRevisionPublished(ContentEntityInterface $entity);
    
    /**
     * Gets the workflow for the given content entity.
     *
     * @param \Drupal\Core\Entity\ContentEntityInterface $entity
     *   The content entity to get the workflow for.
     *
     * @return \Drupal\workflows\WorkflowInterface|null
     *   The workflow entity. NULL if there is no workflow.
     */
    public function getWorkflowForEntity(ContentEntityInterface $entity);
    
    /**
     * Gets the workflow for the given entity type and bundle.
     *
     * @param string $entity_type_id
     *   The entity type ID.
     * @param string $bundle_id
     *   The entity bundle ID.
     *
     * @return \Drupal\workflows\WorkflowInterface|null
     *   The associated workflow. NULL if there is no workflow.
     */
    public function getWorkflowForEntityTypeAndBundle($entity_type_id, $bundle_id);
    
    /**
     * Gets unsupported features for a given entity type.
     *
     * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
     *   The entity type to get the unsupported features for.
     *
     * @return array
     *   An array of unsupported features for this entity type.
     */
    public function getUnsupportedFeatures(EntityTypeInterface $entity_type);
    
    /**
     * Gets the original or initial state of the given entity.
     *
     * When a state is being validated, the original state is used to validate
     * that a valid transition exists for target state and the user has access
     * to the transition between those two states. If the entity has been
     * moderated before, we can load the original unmodified revision and
     * translation for this state.
     *
     * If the entity is new we need to load the initial state from the workflow.
     * Even if a value was assigned to the moderation_state field, the initial
     * state is used to compute an appropriate transition for the purposes of
     * validation.
     *
     * @param \Drupal\Core\Entity\ContentEntityInterface $entity
     *   The content entity to get the workflow for.
     *
     * @return \Drupal\content_moderation\ContentModerationState
     *   The original or default moderation state.
     */
    public function getOriginalState(ContentEntityInterface $entity);

}