[rules-users] template 101

[Stefan Marconi]

Hi Felipe,

thank you for bearing with me.

actually I put an eval() there just to have something as simple as
possible(but couldn't be sure it it worked).

I actually found a hello world example which works fine without being
template and which I will now try to transform it into template form. I
suspect I'm not passing parameter correctly, somehow.

I will unfortunately be away for the next 10 days, so will revert only later
and hopefully on a better example than my original.

Thanks. Stefan

2010/4/27 Felipe Piccolini <felipe.piccolini at gmail.com>

> Im not sure if you can find a complete standalone example for this, but I
> think your problem now is with eval().
>
> Can you copy your stackTrace here?
>
> I think you can not do eval( literal == literal),
> but you could make a function to test that if you wanna use eval and give
> the function the value of @{symbol}
>
>
> 2010/4/27 Stefan Marconi <stefan.marconi at gmail.com>
>
> 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
>>>>
>>>>
>>>> _______________________________________________
>>>> rules-users mailing list
>>>> rules-users at lists.jboss.org
>>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>>>
>>>>
>>>
>>>
>>> --
>>> -----------------------------
>>> Felipe Piccolini
>>> felipe.piccolini at gmail.com
>>>
>>> _______________________________________________
>>> rules-users mailing list
>>> rules-users at lists.jboss.org
>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>>
>>>
>>
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>>
>>
>
>
> --
> -----------------------------
> Felipe Piccolini
> felipe.piccolini at gmail.com
>
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>
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