[rules-users] Finding matching values in composite constraint

[Jeremy Ary]

Reading it back over, I can simplify this a bit if we're solely dealing
with strings...

...

public class Transaction {

        private String field;

        // ... getter and setter for field, as well as all your other
methods in transaction, just showing this to say I'm assuming 'field' to be
of type String
}

rule "find value substring match"
when
    $s : String ( )
    $t : Transaction( field.contains($s) )
then
    sendAlert("Transaction " + $t.getName() + "matches criteria: " + $s);
end

...

session.insert(transaction);
for (int i = 0; i < listOfUserValueStrings.length; i++) {
     session.insert(listOfUserValueStrings[i];
}



On Sat, Jan 5, 2013 at 1:29 PM, Jeremy Ary <jeremy.ary at gmail.com> wrote:

> If your matcher doesn't equate to a boolean value, I don't think that
> condition will evaluate as you suspect it will. Functions in your
> conditions isn't going to be as clean or easy as you suspect. Consider
> inserting the user-supplied values into your session and matching with a
> rule:
>
> ...
> public class Transaction {
>
>         private String field;
>
>         // ... getter and setter for field, as well as all your other
> methods in transaction, just showing this to say I'm assuming 'field' to be
> of type String
> }
>
> ...
>
> public class Value {
>
> private String value;
>
> public String getValue() {
> return value;
>  }
>
> public void setValue(String value) {
>  this.value = value;
> }
> }
>
> ...
>
> rule "find value substring match"
> when
>     Value ( $v : value )
>     $t : Transaction( field.contains($v) )
> then
>     sendAlert("Transaction " + $t.getName() + "matches criteria: " + $v);
> end
>
> ...
>
> session.insert(transaction);
> for (int i = 0; i < listOfUserValues.length; i++) {
>      session.insert(listOfUserValues[i];
> }
>
>
> On Sat, Jan 5, 2013 at 12:29 PM, bdolbeare <bdolbeare at yahoo.com> wrote:
>
>> Suppose we have a Transaction object with a String field.  Users want to
>> create a rule through our application that says alert me whenever the
>> value
>> of that field contains a value in a list of values provided in the rule.
>> It's easy enough to write this type of rule and send an alert; however, it
>> would be helpful to include the value from the list that matched.
>>
>> The only way I can think to do this type of thing is to create a function
>> somewhere that checks if the field contains any of the values in the user
>> list and if so return that value.  Then call that function in the rule
>> condition and bind the result.  Something like what follows:
>>
>>
>> public class ExternalMatcher
>> {
>>   public static String contains(String field, String...list)
>>   {
>>   // return the first string that satisfies the contains logic or null if
>> no
>> strings succeed
>>   }
>> }
>>
>> rule "test"
>> when
>> Transaction( $matchedValue : ExternalMatcher.contains(field, "value1",
>> "value2", "value3") != null)
>> then
>> sendAlert("I found a transaction that matched your criteria because field
>> foo equals: " + $matchedValue);
>> end
>>
>>
>>
>>
>>
>> --
>> View this message in context:
>> http://drools.46999.n3.nabble.com/Finding-matching-values-in-composite-constraint-tp4021343p4021346.html
>> Sent from the Drools: User forum mailing list archive at Nabble.com.
>> _______________________________________________
>> rules-users mailing list
>> rules-users at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>
>
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