Hi Thomas and all,

   Drools delegates most of the complex expression evaluation to MVEL and it seems that it currently does not support variables as indexes in the map/collection simplified syntax. So, it will not work for now.
   The good news is that we work very close with MVEL's author and if we kindly ask him (translation: offer him a few drinks and/or gifts) :) he usually adds support to such things.. ;) if so, just upgrading MVEL dependency jar will be enough to make it work, no need for a new drools release (hopefully). I will talk to him.

   Meanwhile, tip for the curious: MVEL has a shell tool quite useful to play and check such things. Just run org.mvel.MVELSH having the MVEL jar in your classpath and you can play with it:

Welcome to MVEL!
mvel$ x = new java.util.HashMap()
OUT: {}
mvel$ x["a"] = "p"
OUT: p
mvel$ v="b"
OUT: b
mvel$ x[v]="q"
org.mvel.PropertyAccessException: unable to resolve property: failed to access property: <<v>> in: class java.util.HashMap
ERROR: unable to resolve token: v
mvel$ w=10
OUT: 10
mvel$ x[w]="r"
org.mvel.PropertyAccessException: unable to resolve property: failed to access property: <<w>> in: class java.util.HashMap
mvel$ x[10]="r"
OUT: r
mvel$ x
OUT: {a=p, 10=r}
mvel$

   []s
   Edson

2008/7/24 thomas kukofka <thomaskukofka@web.de>

Thanks,

but I've still Problems if I try to use
io: InputObject ( stringParameters[InputObject.

Parameter.ParameterName] == "something")

=>Field/method 'InputObject' not found for class 'com.rules.InputObject'Rule Compilation error

Parameter is an enum witch contains all allowed Parameters of InputObject

Kind Regards
Thomas

2008/7/23 Edson Tirelli <tirelli@post.com>:

   If you make your map available through a get, you can use simplified Map syntax like this:

public Map getStringParameters() {

        return stringParameter;
    }

   
io: InputObject ( stringParameters["propertyname"] == "something")

   []s
   Edson

2008/7/23 thomas kukofka <thomaskukofka@web.de>:

Hello ,

I just recognized, that this doesn't work. But it is possible to use plain Java code in the rule, also if-conditions and for and while-loops etc.. However more Java code makes the rule less readable and elegant.
Is there another possibility to use generic input objects?

Thomas

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--
Edson Tirelli
JBoss Drools Core Development
JBoss, a division of Red Hat @ www.jboss.com

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_______________________________________________
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--
Edson Tirelli
JBoss Drools Core Development
JBoss, a division of Red Hat @ www.jboss.com