Re: [rules-users] Using object.getter in Decision table
The best place to start is the drools documentation
http://www.jboss.org/drools/documentation particularly the expert guide.
This shows both drl and spreadsheet syntax and examples.
You are getting the exception because the first line of the condition should just be an
object restriction eg fact1 : DataObject()
Your second line is then a restriction on that data object.
What you send from your screen and what you insert into the working memory doesn't
have to be identical.
Your screen may use a single object to relay the object but that doesn't mean you
can't explode it into separate facts as you insert it into your working memory, but it
depends on what you are trying to achieve - are these just validation rules or are you
going to be modifying the objects?
Thomas
-----Original Message-----
From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-
bounces(a)lists.jboss.org] On Behalf Of jilani
Sent: 04 October 2011 09:43
To: rules-users(a)lists.jboss.org
Subject: Re: [rules-users] Using object.getter in Decision table
Thank You for your reply.
I am trying to access all the facts through one fact, actually the scenario is we
have multiple screens in our application and each screen will have multiple
fields where we want to show/hide the screen/field based on data provided
in screens.
So Instead of sending each screen data separate, We thought of sending the
parent object and inside the rules(i.e decision table) we want to access the
data of specific screen.
As mentioned by you, I am using the intermediate DRL output using below
code SpreadsheetCompiler sc = new SpreadsheetCompiler();
String drlstr = null;
try
{
drlstr =
sc.compile(ResourceFactory.newClassPathResource(decisionTableSheet,
this.getClass()).getInputStream(), InputType.XLS);
}
Here it is giving the rule parse exception and returning the package as null.
Coming to DRL, I am facing difficulty in defining rules like scenarios as below
- null check
- need to use java String methods like equals() and length()
- setting data in HashMap, ArrayList
Actually I tried the above using a rule definition in Guvnor.
It would be helpful If you can provide me the URL or some information to
write rules using DRL.
My Development environment:
Drools 5.2
Eclipse with JBoss tools
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