Variables map reusability among different Expression instances

[oswaldobapvicjr]

Hello,
I have just tested EvalEx. You guys did quite a good job!
But I have a scenario where I need several independent (still sequential) Expression instances and I couldn't find a way to share the same hash map of variables among the Expression instances.

I am using the method Expression.vithValues(...), which accepts a Map<String, ?> of preset values as a parameter, which, inside, will perform value conversions (to EvaluationValue).

I couldn't find a way to pass a hashmap of already converted EvaluationValues, so it seems that conversion will happen several times for the same variables when I create new Expression instances, which sounds like a performance waste for me.

Is there a way to avoid that?
Thank you very much,

[uklimaschewski]

If you pass an instance of an EvaluationValue, then no conversion will be done.
Since version 3.1.0, this is done in the DefaultEvaluationValueConverter#convertObject() method.

Another approach for you might be to create your own custom data accessor, replacing the default MapBasedDataAccessor.
See Data Access chapter in the documentation.

[tsuki-0101]

@oswaldobapvicjr can you let me know how did you approached this?

[oswaldobapvicjr]

I created my own, custom DataAccessor and implemented the Adapter design pattern, i.e, the accessor class containing a reference to my context map.