[jboss-jira] [JBoss JIRA] Created: (JBRULES-1457) please support containment test for map keys

[Godmar Back (JIRA)]

please support containment test for map keys
--------------------------------------------

                 Key: JBRULES-1457
                 URL: http://jira.jboss.com/jira/browse/JBRULES-1457
             Project: JBoss Drools
          Issue Type: Feature Request
      Security Level: Public (Everyone can see)
          Components: Drl Parser/Builder
    Affects Versions: 4.0.4
         Environment: any
            Reporter: Godmar Back


Using MVEL as the language for clauses, there is no way to test whether a map's key contain a value.

For instance:

rule "number 1"
when
    e : S(map.keySet() contains "x")
then
    System.out.println("rule number 1");
end

leads to a syntax error because Drool's parser does not allow function calls ("keySet())" in clauses.

On the other hand, MVEL (according to Mike Brocks, please read http://jira.codehaus.org/browse/MVEL-53 ) does not provide an operator to test containment in a map's set (or values). He said he's considering adding a shortcut such as .keys and .values in 2.0 and recommended I open a Drools JIRA issue.

Please provide a way to test for membership in a map's key and value set.


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