[rules-users] refactoring "complex" conditon to use "in" operator

[Cotton, Ben]

Hi,

The following rule is working well.

rule "foo"
when
        Message(_initialStubRate == "1.0") ||
            Message(_initialStubRate == "2.0") || (
                Message(_initialStubRate >= "4.0") &&
                Message(_initialStubRate <= "44.0")
            ) ||
            Message(_initialStubRate == "52.0")
then
    System.out.println("foo");
End

To make this logic more amenable to being generically rendered via .DRT template, I want to simplify this rule .  Consider the following re-factoring.

rule "bar"
when
         Message(_initialStubRate in (
                '1.0',"2.0",
                    "4.0","5.0","6.0","7.0","8.0","9.0","10.0", "11.0", "12.0","13.0",
                    "14.0","15.0","16.0","17.0","18.0","19.0","20.0", "21.0", "22.0","23.0",
                    "24.0","25.0","26.0","27.0","28.0","29.0","30.0", "31.0", "32.0","33.0",
                    "34.0","35.0","36.0","37.0","38.0","39.0","40.0", "41.0", "42.0","43.0",
                    "44.0",
                    "52.0")
         )
then
    System.out.println("bar");
end

This re-facotred rule produces a syntax error in Eclipse's .DRL view.

BuildError: Unable to Analyse Expression _initialStubRate == "1.0" || _initialStubRate == "2.0" || _initialStubRate == "4.0" || _initialStubRate == "5.0" || _initialStubRate == "6.0" || _initialStubRate == "7.0" || _initialStubRate == "8.0" || _initialStubRate == "9.0" || _initialStubRate == "10.0" || _initialStubRate == "11.0" || _initialStubRate == "12.0" || _initialStubRate == "13.0" || _initialStubRate == "14.0" || _initialStubRate == "15.0" || _initialStubRate == "16.0" || _initialStubRate == "17.0" || _initialStubRate == "18.0" || _initialStubRate == "19.0" || _initialStubRate == "20.0" || _initialStubRate == "21.0" || _initialStubRate == "22.0" || _initialStubRate == "23.0" || _initialStubRate == "24.0" || _initialStubRate == "25.0" || _initialStubRate == "26.0" || _initialStubRate == "27.0" || _initialStubRate == "28.0" || _initialStubRate == "29.0" || _initialStubRate == "30.0" || _initialStubRate == "31.0" || _initialStubRate == "32.0" || _initialStubRate == "33.0" || _initialStubRate == "34.0" || _initialStubRate == "35.0" || _initialStubRate == "36.0" || _initialStubRate == "37.0" || _initialStubRate == "38.0" || _initialStubRate == "39.0" || _initialStubRate == "40.0" || _initialStubRate == "41.0" || _initialStubRate == "42.0" || _initialStubRate == "43.0" || _initialStubRate == "44.0" || _initialStubRate == "52.0":
[Error: no such identifier: _initialStubRate]
[Near : {... _initialStubRate == "1.0" || _ ....}]


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[Line: 1, Column: 1]


What could be wrong?

Ben D Cotton III
Morgan Stanley & Co.
OTC Derivatives Clearing Technology
1221 AOTA Rockefeller Ctr - Flr 27
New York, NY 10020
(212)762.9094
ben.cotton at ms.com<mailto:ben.cotton at ms.com>




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