[Spec clarification request] transparency for MultipleGradientPaint

Class java.awt.MultipleGradientPaint implements method getTransparency() from java.awt.Transparency interface. The specs for MultipleGradientPaint does not say anything about how the returned value is calculated. Neither does specs for successors (LinearGradientPaint and RadialGradientPaint).

Please clarify how the returned value is formed.