If you can add the CatalogObject element data to working memory and if
you can add a connective property ("parent" in the rule below) you can
eliminate the use of "eval" (which does not allow the benefits of a RETE
network to be fully realised) I think a rule like the below using 3.1-M1
would provide the same function as that shown by Michael Neale. Lots of
assumptions but performance would be better.
rule "UCCnet_DVE_Depth_All"
when
catalogObject : CatalogObject( )
elementValue( name = "depth", value == null | == "", parent
== catalogObject )
then
logWriter.logDebug( "Package Depth is Blank");
System.out.println( "Package Depth is Blank" );
end
With kind regards,
Mike
________________________________
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Michael Neale
Sent: 04 April 2007 05:18
To: Rules Users List
Subject: Re: [rules-users] Need DRL authoring Help
you are close ;)
Yes, it is a challenge, thats what the examples are for etc.
but try this (FYI I think you mean "or"):
rule "UCCnet_DVE_Depth_All"
when
catalogObject : CatalogObject( )
eval( catalogObject.getElementValue( "depth") == null
|| catalogObject.getElementValue( "depth") == "" )
# String depth =
CatalogObject.getElementValue("depth")
# depth == null
# depth == ""
# catalogObject : CatalogObject( depth == null)
# catalogObject : CatalogObject( depth == "")
then
# DON'T do this logWriter : LogWriter();
# BUT you can pass in a logWriter global variable
logWriter.logDebug( "Package Depth is Blank");
System.out.println( "Package Depth is Blank" );
end
Hope that helps.
In the up coming BRMS, there will be a GUI which also has a
secret purpose of "coaching" what DRL looks like, for those who need to
know.
On 4/4/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
Writing DRL is not easy for people new to drools. Can
someone please help me understand how to write this simple rule? You
can see the approaches I have taken.
In this case I do not have getters and setters for the
attributes I am checking. I need to pass parameters to the object for
it to get the data.
I can't get any of the code in the when block to be
syntax proper. Existing DRL doc is lacking in this area.
Thanks John
rule "UCCnet_DVE_Depth_All"
when
catalogObject : CatalogObject(
getElementValue( "depth") == null, getElementValue( "depth") == "")
# String depth =
CatalogObject.getElementValue("depth")
# depth == null
# depth == ""
# catalogObject : CatalogObject( depth ==
null)
# catalogObject : CatalogObject( depth == "")
then
logWriter : LogWriter();
logWriter.logDebug( "Package Depth is
Blank");
System.out.println( "Package Depth is Blank"
);
end
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