interface TransitionInterface

interface TransitionInterface {
    
    /**
     * The key of the transition plugin form.
     */
    const PLUGIN_FORM_KEY = 'transition';
    
    /**
     * The transition direction from.
     */
    const DIRECTION_FROM = 'from';
    
    /**
     * The transition direction to.
     */
    const DIRECTION_TO = 'to';
    
    /**
     * Gets the transition's ID.
     *
     * @return string
     *   The transition's ID.
     */
    public function id();
    
    /**
     * Gets the transition's label.
     *
     * @return string
     *   The transition's label.
     */
    public function label();
    
    /**
     * Gets the transition's from states.
     *
     * @return \Drupal\workflows\StateInterface[]
     *   The transition's from states.
     */
    public function from();
    
    /**
     * Gets the transition's to state.
     *
     * @return \Drupal\workflows\StateInterface
     *   The transition's to state.
     */
    public function to();
    
    /**
     * Gets the transition's weight.
     *
     * @return string
     *   The transition's weight.
     */
    public function weight();

}