Can a flag be added to define the polarity of a digital output?

[FDelporte]

In a project where a relay is used, the digital output must be used "inverted" to control the relay because "LOW" sets the relay and "HIGH" resets it. This results in this code:

Maybe it could be an idea to extend DigitalOutput in the library with an isInverted flag. But this would also mean all output methods have to take this flag into account.

[savageautomate]

Yes, we really should add support for this. We added the methods on() and off() for convenience but in many cases on and off don't track with hi and low states.

In fact it looks like we have a comment in the source to revisit the on and off implementation.
https://github.com/Pi4J/pi4j-v2/search?q=%2F%2F+TODO+%3A%3A+REVISIT+STATE+VS+ON%2FOFF

If do think some form of inverted state configuration should be allowed that only applies to the on(), isOn(), off() and isOff() methods. The high and low states should always be explicit and concrete in meaning but on and off can be relative to the specific hardware implementation.