interface EntityFieldManagerInterface

interface EntityFieldManagerInterface {
    
    /**
     * Gets the base field definitions for a content entity type.
     *
     * Only fields that are not specific to a given bundle or set of bundles are
     * returned. This excludes configurable fields, as they are always attached
     * to a specific bundle.
     *
     * @param string $entity_type_id
     *   The entity type ID. Only entity types that implement
     *   \Drupal\Core\Entity\FieldableEntityInterface are supported.
     *
     * @return \Drupal\Core\Field\FieldDefinitionInterface[]
     *   The array of base field definitions for the entity type, keyed by field
     *   name.
     *
     * @throws \LogicException
     *   Thrown if one of the entity keys is flagged as translatable.
     */
    public function getBaseFieldDefinitions($entity_type_id);
    
    /**
     * Gets the field definitions for a specific bundle.
     *
     * @param string $entity_type_id
     *   The entity type ID. Only entity types that implement
     *   \Drupal\Core\Entity\FieldableEntityInterface are supported.
     * @param string $bundle
     *   The bundle.
     *
     * @return \Drupal\Core\Field\FieldDefinitionInterface[]
     *   The array of field definitions for the bundle, keyed by field name.
     */
    public function getFieldDefinitions($entity_type_id, $bundle);
    
    /**
     * Gets the field storage definitions for a content entity type.
     *
     * This returns all field storage definitions for base fields and bundle
     * fields of an entity type. Note that field storage definitions of a base
     * field equal the full base field definition (i.e. they implement
     * FieldDefinitionInterface), while the storage definitions for bundle fields
     * may implement FieldStorageDefinitionInterface only.
     *
     * @param string $entity_type_id
     *   The entity type ID. Only content entities are supported.
     *
     * @return \Drupal\Core\Field\FieldStorageDefinitionInterface[]
     *   The array of field storage definitions for the entity type, keyed by
     *   field name.
     *
     * @see \Drupal\Core\Field\FieldStorageDefinitionInterface
     */
    public function getFieldStorageDefinitions($entity_type_id);
    
    /**
     * Gets a lightweight map of fields across bundles.
     *
     * @return array
     *   An array keyed by entity type. Each value is an array which keys are
     *   field names and value is an array with two entries:
     *   - type: The field type.
     *   - bundles: An associative array of the bundles in which the field
     *     appears, where the keys and values are both the bundle's machine name.
     */
    public function getFieldMap();
    
    /**
     * Sets a lightweight map of fields across bundles.
     *
     * @param array[] $field_map
     *   See the return value of self::getFieldMap().
     *
     * @return $this
     */
    public function setFieldMap(array $field_map);
    
    /**
     * Gets a lightweight map of fields across bundles filtered by field type.
     *
     * @param string $field_type
     *   The field type to filter by.
     *
     * @return array
     *   An array keyed by entity type. Each value is an array which keys are
     *   field names and value is an array with two entries:
     *   - type: The field type.
     *   - bundles: An associative array of the bundles in which the field
     *     appears, where the keys and values are both the bundle's machine name.
     */
    public function getFieldMapByFieldType($field_type);
    
    /**
     * Clears static and persistent field definition caches.
     */
    public function clearCachedFieldDefinitions();
    
    /**
     * Disable the use of caches.
     *
     * @param bool $use_caches
     *   FALSE to not use any caches.
     */
    public function useCaches($use_caches = FALSE);
    
    /**
     * Gets the "extra fields" for a bundle.
     *
     * @param string $entity_type_id
     *   The entity type ID.
     * @param string $bundle
     *   The bundle name.
     *
     * @return array
     *   A nested array of 'pseudo-field' elements. Each list is nested within the
     *   following keys: entity type, bundle name, context (either 'form' or
     *   'display'). The keys are the name of the elements as appearing in the
     *   renderable array (either the entity form or the displayed entity). The
     *   value is an associative array:
     *   - label: The human readable name of the element. Make sure you sanitize
     *     this appropriately.
     *   - description: A short description of the element contents.
     *   - weight: The default weight of the element.
     *   - visible: (optional) The default visibility of the element. Defaults to
     *     TRUE.
     *   - edit: (optional) String containing markup (normally a link) used as the
     *     element's 'edit' operation in the administration interface. Only for
     *     'form' context.
     *   - delete: (optional) String containing markup (normally a link) used as the
     *     element's 'delete' operation in the administration interface. Only for
     *     'form' context.
     */
    public function getExtraFields($entity_type_id, $bundle);

}