private int getCacheKey ( InputDevice device , GVRControllerType controllerType ) { if ( controllerType != GVRControllerType . UNKNOWN && controllerType != GVRControllerType . EXTERNAL ) { // Sometimes a device shows up using two device ids // here we try to show both devices as one using the // product and vendor id int key = device . getVendorId ( ) ; key = 31 * key + device . getProductId ( ) ; key = 31 * key + controllerType . hashCode ( ) ; return key ; } return - 1 ; // invalid key }
Return the key if there is one else return - 1