[rules-users] Arrays help

Wed Oct 3 10:03:40 EDT 2007

If you can't insert the NameValue objects at all because you are using
somebody else's code to setup the initial facts you can use another rule to
do this for you:-

rule "insert NameValues"
    salience -100
    when
        $l : LineItem( )
    then
        for(int i = 0, NameValue[] nvs = $l.getNameValueArray(); i <
nvs.length; i++) {
            insert(nvs[i]);
        }
end

rule "process NameValues"
    salience -90
    when
      $nv : NameValue( )
    then
        ...
end

Depending on what you want to do with NameValue (i.e. simply count them or
apply a function to a value) you could try looking at "collect" or
"accumulate" but I doubt this is what you are after.

Lastly you can always iterate over them in the RHS of a rule - but without
inserting them into working memory you'll never be able to write rules to
handle them.

  _____  

From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Bhattacharya,
Sougata
Sent: 03 October 2007 14:26
To: Rules Users List
Subject: RE: [rules-users] Arrays help

Your assumption is correct, but how do I iterate throw the array

  _____  

From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Anstis, Michael
(M.)
Sent: Wednesday, October 03, 2007 6:52 PM
To: Rules Users List
Subject: RE: [rules-users] Arrays help

Do you mean you cannot insert NameValue facts into working memory?

If this is the case, then you might have to use eval or MVEL dialect. Based
upon your model below I assumed you could insert NameValues:-

LineItem-->getParameters() returns Parameter[]

Parameter->getNameValueArray() return NameValue[]

Each NameValue has name and value attribute

  _____  

From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Bhattacharya,
Sougata
Sent: 03 October 2007 13:23
To: Rules Users List
Subject: RE: [rules-users] Arrays help

Yes that's the simple one, but I can't send the NameValue, I will send only
the LineItem

  _____  

From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Anstis, Michael
(M.)
Sent: Wednesday, October 03, 2007 5:36 PM
To: Rules Users List
Subject: RE: [rules-users] Arrays help

I forgot to mention, this assumes you want to maintain the relationships. If
you're not interested in these but merely want to process all NameValue
objects then a simple rule works fine:-

rule "don't worry about preserving relationships"

    when

        $n : NameValue ( )

    then

        .....

end

Simply assert all NameValue objects.

  _____  

From: Anstis, Michael (M.) 
Sent: 03 October 2007 12:48
To: 'Rules Users List'
Subject: RE: [rules-users] Arrays help

There are a number of ways...

Java dialect [requires LineItem, Parameter and NameValue to be asserted into
working memory]

rule "a - requires object model change for parent property"

    when

        $l : LineItem( )

        $p : Parameter ( parent == $l )

        $n : NameValue( parent == $p )

    then

        ...

end

rule "b"

    when

        $n : NameValue( )

        $p : Parameter ( nameValues contains $n )

        $l : LineItem( parameters contains $p )

    then

        ...

end

MVEL dialect

rule "c"

    dialect mvel

    when

        $n :
my-mvel-syntax-lets-me-down-but-I-know-you-can-traverse-object-graphs-using-
it

    then

        ...

end

  _____  

From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Bhattacharya,
Sougata
Sent: 03 October 2007 12:37
To: Rules Users List
Subject: [rules-users] Arrays help

Hi All,

  I have a object graph like this

LineItem has array of Parameter and each Parameter has array of  NameValue
and Namevalue object has name and value.

Now I have LineItem object in working memory, how to test the value of each
value of NameValue object.

LineItem-->getParameters() returns Parameter[]

Parameter->getNameValueArray() return NameValue[]

Each NameValue has name and value attribute

Any help?

Ta

Sougata

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