interface TypedDataInterface

interface TypedDataInterface {
    
    /**
     * Constructs a TypedData object given its definition and context.
     *
     * @param \Drupal\Core\TypedData\DataDefinitionInterface $definition
     *   The data definition.
     * @param string|null $name
     *   (optional) The name of the created property, or NULL if it is the root
     *   of a typed data tree. Defaults to NULL.
     * @param \Drupal\Core\TypedData\TraversableTypedDataInterface $parent
     *   (optional) The parent object of the data property, or NULL if it is the
     *   root of a typed data tree. Defaults to NULL.
     *
     * @todo When \Drupal\Core\Config\TypedConfigManager has been fixed to use
     *   class-based definitions, type-hint $definition to
     *   DataDefinitionInterface. https://www.drupal.org/node/1928868
     *
     * @see \Drupal\Core\TypedData\TypedDataManager::create()
     */
    public static function createInstance($definition, $name = NULL, TraversableTypedDataInterface $parent = NULL);
    
    /**
     * Gets the data definition.
     *
     * @return \Drupal\Core\TypedData\DataDefinitionInterface
     *   The data definition object.
     */
    public function getDataDefinition();
    
    /**
     * Gets the data value.
     *
     * @return mixed
     *   The data value.
     */
    public function getValue();
    
    /**
     * Sets the data value.
     *
     * @param mixed|null $value
     *   The value to set in the format as documented for the data type or NULL to
     *   unset the data value.
     * @param bool $notify
     *   (optional) Whether to notify the parent object of the change. Defaults to
     *   TRUE. If a property is updated from a parent object, set it to FALSE to
     *   avoid being notified again.
     *
     * @throws \InvalidArgumentException
     *   If the value input is inappropriate.
     * @throws \Drupal\Core\TypedData\Exception\ReadOnlyException
     *   If the data is read-only.
     */
    public function setValue($value, $notify = TRUE);
    
    /**
     * Returns a string representation of the data.
     *
     * @return string
     *   The string representation of the data.
     */
    public function getString();
    
    /**
     * Gets a list of validation constraints.
     *
     * @return array
     *   Array of constraints, each being an instance of
     *   \Symfony\Component\Validator\Constraint.
     */
    public function getConstraints();
    
    /**
     * Validates the currently set data value.
     *
     * @return \Symfony\Component\Validator\ConstraintViolationListInterface
     *   A list of constraint violations. If the list is empty, validation
     *   succeeded.
     */
    public function validate();
    
    /**
     * Applies the default value.
     *
     * @param bool $notify
     *   (optional) Whether to notify the parent object of the change. Defaults to
     *   TRUE. If a property is updated from a parent object, set it to FALSE to
     *   avoid being notified again.
     *
     * @return $this
     *   Returns itself to allow for chaining.
     */
    public function applyDefaultValue($notify = TRUE);
    
    /**
     * Returns the name of a property or item.
     *
     * @return string|int|null
     *   If the data is a property of some complex data, the name of the property.
     *   If the data is an item of a list, the name is the numeric position of the
     *   item in the list, starting with 0. Otherwise, NULL is returned.
     */
    public function getName();
    
    /**
     * Returns the parent data structure; i.e. either complex data or a list.
     *
     * @return \Drupal\Core\TypedData\TraversableTypedDataInterface|null
     *   The parent data structure, either complex data or a list; or NULL if this
     *   is the root of the typed data tree.
     */
    public function getParent();
    
    /**
     * Returns the root of the typed data tree.
     *
     * Returns the root data for a tree of typed data objects; e.g. for an entity
     * field item the root of the tree is its parent entity object.
     *
     * @return \Drupal\Core\TypedData\TraversableTypedDataInterface
     *   The root data structure, either complex data or a list.
     */
    public function getRoot();
    
    /**
     * Returns the property path of the data.
     *
     * The trail of property names relative to the root of the typed data tree,
     * separated by dots; e.g. 'field_text.0.format'.
     *
     * @return string
     *   The property path relative to the root of the typed tree, or an empty
     *   string if this is the root.
     */
    public function getPropertyPath();
    
    /**
     * Sets the context of a property or item via a context aware parent.
     *
     * This method is supposed to be called by the factory only.
     *
     * @param string|null $name
     *   (optional) The name of the property or the delta of the list item,
     *   or NULL if it is the root of a typed data tree. Defaults to NULL.
     * @param \Drupal\Core\TypedData\TraversableTypedDataInterface|null $parent
     *   (optional) The parent object of the data property, or NULL if it is the
     *   root of a typed data tree. Defaults to NULL.
     */
    public function setContext($name = NULL, TraversableTypedDataInterface $parent = NULL);

}