It may also be worth explaining exactly what you aim to achieve through this and why. From what I have seen, most people who ask about introspecting the LHS of rules via the API, don’t actually need to do that.
Steve On 7 Jan 2014, at 08:56, Wolfgang Laun <wolfgang.l...@gmail.com> wrote: > Hi, > > while you continue this line of research you might consider possible > ramifications and snags, and be prepared for them. > > The syntax for writing LHS conditions is quite complex - it's more > complex than Java expressions, because the CE eval() alone will give > you (almost) all of that. Rule authors may also use DRL functions, > which could hide field access. > > If *you* author the rules, you may be able to avoid the worst, but it > won't be a piece of cake. > > Cheers > -W > > > > On 07/01/2014, milen igrachev <igrac...@abv.bg> wrote: >> Hello thanks for the quick and precise answer! >> I believe that the time difference will be a bit of a problem for the IRC >> chat , but i will be online (channel: #drools user: igrachev) today and will >> try to check it often. However big thanks for the support and the >> willingness to help! >> You are saying that the code is there, but is not public and documented. >> Well being not public seems to be a problem, but do you think it is >> possible to give me an example with the official Drools "first rule" - >> Sample.drl. The one that comes with the first Drools project. So do you >> believe it will be possible to paste me some code on how to retrieve the >> information that this ruleset is using one fact of type Message and two of >> it's attributes - status and message. So just some code in a public >> static void main (String [] args) will be great :), or any kind of >> explanation :). >> Once again thank you. >> Have a nice day, >> Milen >> >> >> >> ----Original Letter---- >> From: Mark Proctor mproc...@codehaus.org >> >> About: Re: [rules-users] Is rule introspection available from the Drools >> API? >> >> To: Rules Users List >> >> Sent at: Monday, 2014, January 6 16:05:33 EET >> >> >> The code is there, but it’s not public and not documented, and the code can >> be a little hard to understand - as it’s grown organically over the years. >> >> >> >> You’ll need to cast and unwrap and look at member vars. Start on the Rule >> and the lhs variable. You can always pop onto irc, with live questions,and >> we’ll try and respond quickly. >> >> http://www.jboss.org/drools/irc >> >> >> >> Mark >> >> >> >> On 6 Jan 2014, at 09:51, milen igrachev igrac...@abv.bg > wrote: >> >> >> >>> Hello, >> >>> is there a way to introspect a Drools file from within java code? >> >>> What I need is to be able to identify the facts and the fact attributes >>> that are used in a given DRL file. >> >>> >> >>> For example if I have a rule stored in a customer.drl DRL file within my >>> project, containing the following definition: >> >>> package myRulePackage >> >>> >> >>> import org.rules.model.Customer >> >>> import org.rules.model.Mambership >> >>> >> >>> rule "is eligible customer" >> >>> when >> >>> $c:Customer(status == "active") >> >>> Membership(customer == $c, type == "premium") >> >>> then >> >>> $c.setEligibilityStatus(true); >> >>> end >> >>> >> >>> What i need is a way to understand that this ruleset customer.drl is using >>> two fact types - Customer and Membership and three of their attributes - >>> Customer.status, Membership.customer and Membership.type. >> >>> >> >>> >> >>> I found some information on the internet that such functionality is not >>> supported, however the information was a bit too old, so I decided to ask >>> again. >> >>> >> >>> >> >>> Big thanks for the support! >> >>> Milen >> >>> _______________________________________________ >> >>> rules-users mailing list >> >>> rules-users@lists.jboss.org >> >>> https://lists.jboss.org/mailman/listinfo/rules-users >> >> >> >> >> >> _______________________________________________ >> >> rules-users mailing list >> >> rules-users@lists.jboss.org >> >> https://lists.jboss.org/mailman/listinfo/rules-users >> >> > > _______________________________________________ > rules-users mailing list > rules-users@lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users
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