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@lists.jboss.org [mailto:rules-users-bounces@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.

 

LineItemàgetParameters() returns Parameter[]

Parameter->getNameValueArray() return NameValue[]

Each NameValue has name and value attribute

Any help?

 

Ta

Sougata

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