[rules-users] Collecting / sorting by the number of matches

[KDR]

Hi, ta very much everyone for the help so far.

Another question - how to sort by number of matches please?

Say I have objects A, B, C and D and rules 1 to 5. Each object can match
each rule independently e.g. A can match rule 1 and 2, B might match all
rules 1 to 5, C might match none, D rules 3 and 4 etc.

I need to rank them and then print out info about them in order of number of
matches, with an indication of which rules matched, i.e. print info on B
before A but nothing at all on C, etc.

In Java I'd probably do it by having, as a global variable, a map where the
key is the name or ID field of the object and the value is an arraylist
which gets added to in the consequence (with a string about what kind of
match it was i.e. which rule was matched) whenever there's a match on a rule
for that object. Then sort it by descending length of the arraylists.

There has to be a better and more elegant way of doing it in Drools,
probably involving collecting info on the matches and then sorting them, but
I can't think what or how.

Does anyone have any thoughts or suggestions please?

Many thanks in advance.

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