ABAP class or function for retrieving BEx query properties at runtime

Hello Experts,
I'm working on BADI RSR_OLAP_BADI and for a special calculation I need to know which characteristics are in the drill-down of the BEX query, sol later on I can aggregate some key figures using only these characteristics.
Problem is that structure C_s_DATA in method COMPUTE contains all fields of the query (filters, free chars, chars in the rows, etc) and I need to now which characteristics are currently being showing in the Bex analyzer.
So is there an ABAP class or function module I can use to find out this kind of information at run time?
Any suggestion?
Thank you

Tank you for the feedback,
I tried to use the class you provided, but I'm stuck now in how to get from within my class that implements RSR_OLAP_BADI interface, a handle, reference, o whatever represent my runtime query (not the query at design time) . As the class you provide must be instantiated before I can use
In pseudo code could be something like this
DATA my_query type query_ref.
my_query = get_rt_query().
my_query->get_state()
regards

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ABAP class or function for retrieving BEx query properties at runtime

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