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     *

     * @see BindingState::ENABLED

     */

    public function isEnabled()

    {

        if (null === $this->state) {

            throw new NotLoadedException('The binding descriptor is not loaded.');

        }

        return BindingState::ENABLED === $this->state;

    }

    /**

     * Returns whether the type of the binding does not exist.

     *

     * @see BindingState::TYPE_NOT_FOUND

     */

    public function isTypeNotFound()

    {

        if (null === $this->state) {

            throw new NotLoadedException('The binding descriptor is not loaded.');

        }

        return BindingState::TYPE_NOT_FOUND === $this->state;

    }

    /**

     * Returns whether the type of the binding is not enabled.

     *

     * @see BindingState::TYPE_NOT_ENABLED

     */

    public function isTypeNotEnabled()

    {

        if (null === $this->state) {

            throw new NotLoadedException('The binding descriptor is not loaded.');

        }

        return BindingState::TYPE_NOT_ENABLED === $this->state;

    }

    /**

     * Returns whether the binding is invalid.

     *

     * @see BindingState::INVALID

     */

    public function isInvalid()

    {

        if (null === $this->state) {

            throw new NotLoadedException('The binding descriptor is not loaded.');

        }

        return BindingState::INVALID === $this->state;

    }

    private function refreshState()

    {