Can you use XSLT to extract information form .DRL

Aygith · February 15th, 2013, 11:15 AM

Posted this in java but im thinking its mroe likely to by an XML/Xpath/XSLT issue..

I have 1000's of drule/drool files and i am looking for a script i can run that will extract the name of each rule (will be multiple per file) within the file and extract its logger.info line so that i get a text or xml file with

Rule "blah blah1"
logger.info ("declined because you smell");
Rule "blah blah2"
logger.info ("declined because you don't smell");

etc etc, id run the script on each file individually so that i can keep the data seperate for each file.
The rules are built using an ANT built on a satbuild.xml that compiles the .drl file, and various XML viles into a Jar file if that helps at all the .drl is used to filter information from being output and the xml's are Morphs for the data being output

samjudson · February 15th, 2013, 12:02 PM

Is a Drools file an XML file? Assume we have never heard of Drool before.

If so you'd have to show us a sample of the XML and highlight what you want to output to look like.

Aygith · February 15th, 2013, 12:10 PM

It is a Java/Joda language file that is used to read and apply restrictions to XML.
For example inside a Drule/drool (not actually sure on the spelling they are .drl files you will have various sections like

Code:

rule "EX Modified"
salience 600
when
	AbstractRulesEngineRequest(aggregatorName == "#####")
	$broker : Broker(brokerName == broker)
	Vehicle(modified == true)	
then
	logger.info("**** Rejecting due to modifications ****");
	$broker.setInclude(false);
	retract($broker);	
end

The Aggname will only move to enxt line if AggName was #####, then broker is assigned to a variable $broker and only moves on if the broker is in the "broker" global (an xml file as follows)

Code:

<globals>
  <global name="broker">
    <string>whoever</string>
    <string>whoever2</string>
  </global>
</globals>

this then looks up some information retracted from XML and stored into transformers and if the value of this XML tag is true, moves to the THEN.
this removes the broker form the quote, removes the broker from the list of activer brokers amd Prints out an error/decline message. if there was 10 of these rules in 1 file, i would want something maybe XLST or maybe it would have to be Java/Joda to take the rule"" line and logger.info line. The drl file (built into a jar file) outputs into xml ready to be passed around and passed through more Drule/drool files

Aygith · February 15th, 2013, 12:15 PM

i guess in short.... .drl is compiled into a jar file with XSLT/XPATH and the job of the drl job is to stop the XML being proccessed any further and present an error line

mhkay · February 15th, 2013, 12:26 PM

Do you have a grammar for this language? If so you could parse it using for example Gunther Rademacher's REX parser which would produce output suitable for processing by XSLT.

Alternatively you might be able to extract what you need without complete parsing, but that would depend on the grammar and on what you actually need.

samjudson · February 15th, 2013, 12:26 PM

Doesn't look like the DRL file is an XML file to me. XSLT is perhaps not your best bet.