Thx for your answer.
I tried again the rule, removing the extra space after hyphen from DSL expresion. No luck. So, I tried a few more cases, and the only one that worked correctly was #3.
It seems to me that is somehow related to the parenthesis, although it might be something else. Hope this info helps.
1) only eval:
DSL:
[when] There is an Asset=asset:Asset()
[when]-name is empty=eval(name=="''")
[when]-tag is empty=eval(tag=="''")
Rule source:
rule "test_rule"
dialect "mvel"
when
asset:Asset( eval(name=="''", eval(tag=="''") ) )
then
end
2) no eval, but with the parenthesis:
DSL:
[when] There is an
Asset=asset:Asset()
[when]-name is empty=(name=="''")
[when]-tag is empty=(tag=="''")
Rule source
rule "test_rule"
dialect "mvel"
when
asset:Asset( (name=="''", (tag=="''") ) )
then
end
3) simple case
DSL
[when] There is an Asset=asset:Asset()
[when]-name empty=name=="''"
[when]-tag empty=tag=="''"
Rule Source:
rule "test_rule"
dialect "mvel"
when
asset:Asset( name=="''", tag=="''" )
then
end
Thanks,
--- On Thu, 8/26/10, Mauricio Salatino <salaboy@gmail.com>
wrote:
From: Mauricio Salatino <salaboy@gmail.com>
Subject: Re: [rules-users] Drools Guvnor: DSL with multiple fact fields conditions using "-" and eval
To: "Rules Users List" <rules-users@lists.jboss.org>
Date: Thursday, August 26, 2010, 10:43 PMcan you try with this: [when] There is an Asset=asset:Asset() [when] -name is
empty=eval(StringUtils.isBlank(name))
[when] -tag is
empty=eval(StringUtils.isBlank(tag)) |
2010/8/26 Patricia Bogoevici <patriciabogoevici@yahoo.com>
Hi all,
I am using the latest Guvnor release (5.1), and I have the following DSL expression where I use "-" to have conditions on multiple lines:
[when] There is an Asset=asset:Asset()
[when]- name is empty=eval(StringUtils.isBlank(name))
[when]- tag is empty=eval(StringUtils.isBlank(tag))
Having these DSL expressions, I wanted to create a rule, but I ran into some issues.
To summarize: There seems to be a parsing error, when conditions are added in DSL using "-". Did anybody else run into this problem? I wonder if I do something wrong, but, re-creating the DSL to have the 2 conditions into one expression, is all working fine. It may be a combination of "-" and eval?
Below, is the description of rules created, and error I got.
First, I created a rule using the above DSL expressions in the BRL editor. While the
rule looked ok in the editor, and it validated fine, only when I checked the source I noticed is wrong. So, the rule source looks like this:
rule "test_dsl"
dialect "mvel"
when
asset:Asset( eval(StringUtils.isBlank(name, eval(StringUtils.isBlank(tag)) )) )
then
asset.setStatus("INVALID")
end
It looks that the conditions are parsed incorrectly, and the second eval condition is added as a parameter to the StringUtils.isBlank from the first eval. Also, all the right parenthesis are added at the end of the expression. If I add one condition at a time, it all works fine. The error is when I have more than 1 condition.
So, I created a new DSL, that contains both
conditions into one line, eliminating the hyphen between conditions:
[when] There is an asset with name empty AND tag empty =asset:Asset(eval(StringUtils.isBlank(name)),eval(StringUtils.isBlank(tag)))
Using BRL editor, I created a second rule using the DSL above. The rule validated ok, and the rule source looks fine:
rule "test_dsl_1"
dialect "mvel"
when
asset:Asset(eval(StringUtils.isBlank(name)),eval(StringUtils.isBlank(tag)))
then
asset.setStatus("INVALID")
end
I created a test for this rule, that ran correctly.
Thanks,
Patricia
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