jBehave is it possible to capture pattern with multiple choices? - jbehave

Question

I have the following two almost-identical Steps that verify if a property is either null or not:
#Then("groupId of $allocationName is not null")
public void thenGroupIdOfAllocationIsNotNull(String allocationName) {
// Some logic here
...
assertNotNull(...)
}
#Then("groupId of $allocationName is null")
public void thenGroupIdOfAllocationIsNull(String allocationName) {
// Some logic here
...
assertNull(...)
}
I feel like there must be some better way to handle this null vs non-null use case instead of duplicating the Steps. Is there a way to capture the pattern as in
#Then("groupId of $allocationName {is|is not} null")
public void thenGroupIdOfAllocationIsNull(String allocationName, boolean isNot) {
// Some logic here
...
isNot ? assertNotNull(...) : assertNull(...);
}
How do I achieve that with jBehave?

Answer 1

Enum could be used to provide options:
#Then("groupId of '$allocationName' $nullEqualityCheck null")
public void checkGroupIdOfAllocation(String allocationName, NullEqualityCheck nullEqualityCheck) {
// Some logic here
...
nullEqualityCheck.check(...);
}
public enum NullEqualityCheck {
IS {
public void check(...) {
assertNull(...)
}
},
IS_NOT {
public void check(...) {
assertNotNull(...)
}
};
public abstract void check(...);
}