Re: [rules-users] Write Assumptions for NESTED List<Object>
The Java code as shown has a somewhat unlikely flavour, with
OrderLineMeasure containing the field List<OrderLineMeasure>. And the
names used in the rules don't match the Java code, e.g.,
getUBLRuleEnginePriority().
And why should a String field quantity indicate the size of a List?
But see below for a (better) way of writing these rules.
On 26/06/2012, aliosha79 <alex_orl1079(a)yahoo.it> wrote:
Hi i have these simple three POJO class. The first is an OrderType
that
cointains a List or OrderLineType and each orderline cointains a list
of measures.
________________________________________________________
/public class OrderType {
protected List<OrderLineType> OrderLine;
protected String priority;
public void set ....
public List<OrderlineType> get ....
public getPriority()...
public setPriority()...
}
public class OrderLineType {
protected String Quantity;
protected List<OrderLineMeasure> OrderLineMeasure;
public void set ....
public List<OrderLineMeasure> get ....
public getQuantity()...
public setQuantity()...
}
public class OrderLineMeasure {
protected int measure;
protected List<OrderLineMeasure> OrderLineMeasure;
public getMeasure()...
public setMeasure()...
} /
________________________________________________________
I want to write an assumption stating that:
*If an ORDER contains at least 3 orderLine... the order must have the High
Priority.* In can do that writing this rule:
_______________________________________________________________
/when
$Order : OrderType ($orderLineList :orderLine)
OrderLineType(Quantity.Value >= 3 ) from $orderLineList
then
$Order.getUBLRuleEnginePriority().setValue("high");
end/
Your rule would fire once for each OrderLine containing a quantity of
more than 2, which is quite another thing than an order with at least
3 order lines.
rule moreThanThree
when
$order : OrderType( orderLines.size() >= 3, priority != "high" )
then
modify( $order ){ setPriority( "high" ) }
end
You can access orderLines.size() without the need for "from". Testing
priority != "high" ensures that the rule does not loop if you use
modify to notify the Engine that something has changed (which you
probably should do).
________________________________________________________________
Now how can i write the assumption? if i want a rule stating:
*If an ORDER contains at least 3 orderLine and Each OrderLine contains more
than 12 measures... the order must have the High Priority.*
Really thanks for your help.
Regards.
Alessio
rule moreThanThreeTwelve
when
$order: OrderType( orderLines.size() >= 3, priority != "high" )
not OrderLineType( measures.size() < 12 ) from $order.getOrderLines()
then
System.out.println( "3/12" );
modify( $order ){ setPriority( "high" ) }
end
Here "from" is required to extract the OrderLineType objects. The
"not" checks that they all have a List with at least 12 elements.
-W
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