[rules-users] Check if fact is subset of items in the rule

[Michael Anstis]

OK, unless I'm missing something else you should be able to do something
like this:-

rule "setup superset - Rule 1"
   when
   then
        Element ss = new Element("Super set - Rule 1", 1, 2, 3);
        insert(ss);
end

rule "rule 1"
    when
        $f : Fact()
        Element(name="Super set - Rule 1", $f.numbers subsetOf numbers)
    then
        //Do something
end

This uses Wolfgang's Element Class from his example creating custom
operators and assumes Fact exposes a "numbers" property which returns a
Collection. This remains untested but I have no reason to doubt Wolfgang.

With kind regards,

Mike




2010/10/13 Kumar Pandey <kumar.pandey at gmail.com>

> Well the problem is in forming the DRL  :)
> My use case is each rule represents an item with its specific property.
> Fact is a user property and I want to filter the items for this user based
> on the users incoming property as facts.
>
>
> I have been able to get it working like so but eval is not optimum for
> Rete. I was hoping for a better solution that would utilize the Rete
> optimization.
>
> Here's my unit test DRL. Note, I have a isNotSubset method in my fact
> object and I'm getting the list from rule and doing a check.
>
> package com.test
> import com.rule.OfferFact;
> global java.util.List list
>
> rule rule_not_sub_set
> when
>    $context : Fact()
>    eval($context.isNotSubset("SINGER","DANCER", "DOCTOR"))
> then
>    list.add(drools.getRule().getName());
> end
>
>
> 2010/10/13 Michael Anstis <michael.anstis at gmail.com>
>
>> Not as clear as I'd hoped; can you provide an actual rule DRL?
>>
>> 2010/10/13 Kumar Pandey <kumar.pandey at gmail.com>
>>
>> Michael
>>>   Here are some examples
>>>
>>> Rule1  has "str1", "Str2", "Str3"
>>>
>>> Rule2 has "str2", "Str3", "Str5", "Str6", "Str7"
>>>
>>> Rule3 has "str1", "Str3", "Str6"
>>>
>>> etc.
>>>
>>> With fact1 that has  "str1", "Str3" , since this is subset of values in
>>> Rule1 and Rule3, they should not fire but Rule2 should fire
>>>
>>> With fact2 that has "str2", "Str6", "Str7", Rule 2 should not fire and
>>> Rule1 and Rule3 should fire.
>>>
>>> Hope this is clear.
>>>
>>> Thanks
>>> Kumar
>>>
>>> 2010/10/13 Michael Anstis <michael.anstis at gmail.com>
>>>
>>>>  Thanks, please provide a specific example rule too.
>>>>
>>>> Don't forget to keep your posts to the mailing list for the good of the
>>>> community.
>>>>
>>>>
>>>> On 12 October 2010 22:18, Kumar Pandey <kumar.pandey at gmail.com> wrote:
>>>>
>>>>> Michale
>>>>>   Thanks for the response.
>>>>> Here's the link for the thread .
>>>>>
>>>>>
>>>>> http://drools-java-rules-engine.46999.n3.nabble.com/Check-if-fact-is-subset-of-items-in-the-rule-td1680013.html#a1680013
>>>>>
>>>>> and the original about matching strings in two arrays.
>>>>>
>>>>> http://drools-java-rules-engine.46999.n3.nabble.com/Matching-strings-in-two-arrays-td1602511.html#a1602511
>>>>>
>>>>>
>>>>> My use case is that I could have hundreds of rule and each rule could
>>>>> have its own set of strings.
>>>>> A fact object is run through these rules to see which ones are fired.
>>>>> One of the condition to check is that the a list in the fact is not a
>>>>> subset of list in the rule.
>>>>> That is fire the rule only if list in fact is not a subset of list in
>>>>> rule.
>>>>>
>>>>> Thanks
>>>>> Kumar
>>>>>
>>>>>
>>>>> On Tue, Oct 12, 2010 at 12:38 PM, Michael Anstis <
>>>>> michael.anstis at gmail.com> wrote:
>>>>>
>>>>>> OK, I admit I don't have the original thread anymore.
>>>>>>
>>>>>> If I am not wrong (which is always a possibility) for Wolfgang's
>>>>>> operator to work you'd need to externalise the superset from the rule into
>>>>>> WorkingMemory. You could have a rule with higher salience construct the
>>>>>> superset WM fact.
>>>>>>
>>>>>> If you don't mind re-posting or providing a link to the complete
>>>>>> thread (on Nabble or somewhere) I'll happily try to help further.
>>>>>>
>>>>>> On 12 October 2010 17:23, <kumar.pandey at gmail.com> wrote:
>>>>>>
>>>>>>> <quote author='Michael Anstis-2'>
>>>>>>>
>>>>>>> Wolfgang gave a great solution.
>>>>>>> </quote>
>>>>>>> Don't know if I'm missing something obvious here.  I have a superset
>>>>>>> in the rule itself. Each rule has a superset list. In this case how would I
>>>>>>> use Wolfgang's solution. Its comparing through two arrays in runtime. I have
>>>>>>> not been able to construct an array construct with specific values in the
>>>>>>> rule itself.
>>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>
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