Using PythonEnablingPredicate for EventEnablingPredicateFilter

Orekit Python Wrapper usage
1

Dear community,

I am struggling to import PythonEnablingPredicate.
When I do the following, an error pops up as follows.

from org.orekit.propagation.events import EventEnablingPredicateFilter, PythonEnablingPredicate

java.lang.java.lang.ClassNotFoundException: java.lang.ClassNotFoundException: org.orekit.propagation.events.PythonEnablingPredicate

I have looked through Orekit/src/main/java/org/orekit/propagation/events at develop · CS-SI/Orekit · GitHub and seems there is no class called PythonEnablingPredicate.

I have downloaded “orekit-jpype==13.0.2.0”.

Can I have a guide on how to enable using PythonEnablingPredicate?

Sincerely,

2

Hi,
You are using the new jpype Python wrapper instead of the legacy JCC Python wrapper. In the jpype wrapper, the interfaces work differently, please check out the documentation: Files · master · Orekit / orekit_jpype · GitLab

Your code should look something like:

from jpype import JImplements, JOverride
from org.orekit.propagation.events import EventEnablingPredicateFilter, EnablingPredicate

@JImplements(EnablingPredicate)
class MyCustomEnablingPredicate:
    @JOverride
    def eventIsEnabled(self, state, detector, g) -> bool:
        # Do something and return True or False