Working with Maps

[Gerald Cantor]

I have a Map in working memory. The Map has Strings as keys and Integers as values. It has 7 keys (REG301, REG302, ... REG307). I'm looking for a way to incorporate the following into the LHS of a rule:

For keys 301, 302, 303, compute the total of the Integer values (total 1)
For keys 301, 302, 303, compute the number of keys that have greater than 0 values (total 2)
Divide total 1 by total 2 (if total 2 > 0) and check against a range

For keys 304, 305, 306, 307, compute the total of the Integer values (total 3)
For keys 304, 305, 306, 307, compute the number of keys that have greater than 0 values (total 4)
Divide total 3 by total 4 (if total 4 > 0) and check against a range

I have not seen a way to collect / sum over select Map elements.

Any insight as to how I would compute the above totals using collect / sum would be very much appreciated.

Thanks in advance,
Gerald

[Edson Tirelli-3]

   You should really consider creating a proper fact class for your fact, instead of using maps... rules will not be clear using maps.

   Anyway, I did not tested, but the following should work in case you really want to use the maps, but again, it is a good practice:

when
    $map : Map()
    Number( $t1: intValue ) from accumulate(
                Map.Entry( key in ("301", "302, "303"), $v : value ) from $map.entrySet(),
                sum( $v ) )
    Number( $t2: intValue > 0 ) from accumulate(
                Map.Entry( key in ("301", "302, "303"), $v : value > 0 ) from $map.entrySet(),
                count( $v ) )
    eval( ( $t1/$t2 > 1 ) && ($t1/$t2 < 10 ) )
then
   ...
end

    []s
    Edson

2008/4/9 Gerald Cantor <geraldmcantor@...>:

I have a Map in working memory. The Map has Strings as keys and Integers as
values. It has 7 keys (REG301, REG302, ... REG307). I'm looking for a way to
incorporate the following into the LHS of a rule:

For keys 301, 302, 303, compute the total of the Integer values (total 1)
For keys 301, 302, 303, compute the number of keys that have greater than 0
values (total 2)
Divide total 1 by total 2 (if total 2 > 0) and check against a range

For keys 304, 305, 306, 307, compute the total of the Integer values (total
3)
For keys 304, 305, 306, 307, compute the number of keys that have greater
than 0 values (total 4)
Divide total 3 by total 4 (if total 4 > 0) and check against a range

I have not seen a way to collect / sum over select Map elements.

Any insight as to how I would compute the above totals using collect / sum
would be very much appreciated.

Thanks in advance,
Gerald
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Edson Tirelli
JBoss Drools Core Development
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