Rule When for BigDecimal without using Eval

[murali mohan]

I want to write a condition for when a BigDecimal Object is greater than another BigDecimal Object. How can I do this? The following attempt, does not work. Please suggest.

For example:

rule "testRule"
when
    BigDecimal( this.compareTo($anotherBigDecimal) >0 )
then
...
...

end


Thanks.

[Mario Fusco]

Hi,

where is $anotherBigDecimal declared? Can you be a bit more precise? Why do you say that this doesn't work?

Thanks,

Mario

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[murali mohan]

We are using Drools 6.3.0. Improved the Rule example to show where $anotherBigDecimal comes from.

The error I get, on validation, from Drools WorkBench is:
[ERR 102] Line 18:30 mismatched input '>' in rule "<Rulename>"




rule "testRule"
when
    $mortgage: test.Mortgage()
    $anotherBigDecimal: BigDecimal() from $mortgage.amount
    BigDecimal( this.compareTo($anotherBigDecimal) > 0 )
then
...
...

end





[Mario Fusco]

Hi again,

I developed this test case

@Test
public void testBigDecimalCompareTo() {

    String drl =
            "import " + BigDecimal.class.getCanonicalName() + ";\n" +
            "rule R1 when\n" +
            "    $bd1 : BigDecimal()\n" +
            "    $bd2 : BigDecimal( this.compareTo($bd1) > 0 )\n" +
            "then \n" +
            "end\n";

    KieSession kieSession = new KieHelper().addContent( drl, ResourceType.DRL )
                                           .build().newKieSession();

    kieSession.insert(new BigDecimal( 1.0 ));
    kieSession.insert(new BigDecimal( 2.0 ));

    assertEquals( 1, kieSession.fireAllRules() );
}

and also this one that is more similar to your use case

@Test
public void testBigDecimalCompareTo2() {

    String drl =
            "import " + Mortgage.class.getCanonicalName() + ";\n" +
            "import " + BigDecimal.class.getCanonicalName() + ";\n" +
            "rule R1 when\n" +
            "    $mortgage: Mortgage()\n" +
            "    $anotherBigDecimal: BigDecimal() from $mortgage.amount\n" +
            "    BigDecimal( this.compareTo($anotherBigDecimal) > 0 )\n" +
            "then \n" +
            "end\n";

    KieSession kieSession = new KieHelper().addContent( drl, ResourceType.DRL )
                                           .build().newKieSession();

    kieSession.insert(new Mortgage(new BigDecimal( 1.0 )));
    kieSession.insert(new BigDecimal( 2.0 ));

    assertEquals( 1, kieSession.fireAllRules() );
}

public static class Mortgage {
    private final BigDecimal amount;

    public Mortgage( BigDecimal amount ) {
        this.amount = amount;
    }

    public BigDecimal getAmount() {
        return amount;
    }
}

and they both works for me.

Which version of Drools are you using?
If you still have this problem, please provide a complete reproducer so I could investigate it.

Thanks,

Mario

To view this discussion on the web visit https://groups.google.com/d/msgid/drools-usage/09dbfa32-27c2-498d-afe5-0e3b8822b754%40googlegroups.com.

[murali mohan]

Sorry, my mistake. It is indeed working. The rule was complaining because of some other error.

Very sorry for making you write these test cases.

Thanks.