[rules-users] template 101

[Stefan Marconi]

Hi Felipe,

thank you for your reply. I have now added the extra quotes but to no avail.
I still get the same errors.

Is there somewhere a stand-alone example with the compile instructions to
check that everything works? I have the impression that I'm having troubles
with the whole eclipse config and plugin.

Thanks! Stefan


2010/4/26 Felipe Piccolini <felipe.piccolini at gmail.com>

> Using template you will see that the @{} is replaced "just as is" from the
> data (for example from a spreadsheet), so
> if you have a value in the example will be replaced as text in the rule and
> you will have something like this:
>
> if @{symbol} == "THE_SYMBOL"
>
> ==>
>
> rule "A stand alone rule THE_SYMBOL"
> dialect "mvel"
> when
>  eval(THE_SYMBOL == "AAA")
> then
> System.out.println("this symbol is" + THE_SYMBOL)
> end
> ----------
>
> So as you can see, the variable is no more a variable in the generated
> rule, just text, so if you wanna use it as a string, you should add
> double-quote
> (")
>
> your rule template should be something like this:
>
>
> rule "A stand alone rule @{symbol}"
> dialect "mvel"
> when
>  eval("@{symbol}" == "AAA")
> then
> System.out.println("this symbol is" + "@{symbol}")
> end
>
>
>
>
> 2010/4/22 Stefan Marconi <stefan.marconi at gmail.com>
>
>> Hi,
>>
>> just starting using drools and need to use templates but having error
>> messages (described in comments in the code below).
>> I checked the meaning of the error messages but still can't figure it out.
>> I modified an simple rule according to the template section of the drools
>> manual: btw I use the eclipse with the drools-core plugin.
>>
>> Thanks for your help. Stefan
>>
>> template header
>> symbol
>>
>> package com.test.processor; # [ERR 102] Line 4:26 mismatched input ';'
>> expecting 'identifier' in template header
>> template "test"
>> rule "A stand alone rule @{symbol}"
>> dialect "mvel"
>> when
>>  eval(@{symbol} == "AAA")
>> then
>> System.out.println("this symbol is" + @{symbol})
>> end
>> end template # Multiple markers at this line
>> # - [ERR 103] Line 13:0 rule 'rule_key' failed predicate:
>> {(validateIdentifierKey(DroolsSoftKeywords.RULE))}? in rule
>> # - [ERR 101] Line 13:4 no viable alternative at input 'template' in rule
>> end
>>
>>
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>> rules-users at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>>
>
>
> --
> -----------------------------
> Felipe Piccolini
> felipe.piccolini at gmail.com
>
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> https://lists.jboss.org/mailman/listinfo/rules-users
>
>
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