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

[Kumar Pandey]

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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>>>
>>
>>
>>
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>
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