/**
 * Observable manager for saving the [Cart]'s resource information.
 */
class CartManager : LiveData<Resource<Cart?>>() {

  init {
    value = Success(null)
  }

  /**
   * Set the [Cart] value and notifies observers.
   */
  internal fun set(cart: Cart) {
    postValue(Success(cart))
  }

  /**
   * Clear any information from the device.
   */
  internal fun clear() {
    postValue(Success(null))
  }

  /**
   * Signals that the resource information is being retrieved from network.
   */
  internal fun loading() {
    postValue(Loading())
  }

  /**
   * Signals that an error occurred when trying to fetch the resource information.
   */
  internal fun error(t: Throwable) {
    postValue(Failure(t))
  }
}