[rules-users] @key declarations for a type - What's under the hood?

[Matthew Versaggi]

But what if you now have 2 declare statements in which one defines itself
in terms of the other ...

// A room is also a thing
declare Room extends Thing
    name : String @key
end

One would instantiate an object like this:
Room room = new Room("office");


// A door is a pathway between two rooms
declare Door extends Thing
   fromRoom : Room @key
   toRoom   : Room @key
end

How would one instantiate an object of 'Door' ?



On Wed, Feb 26, 2014 at 5:11 PM, Edson Tirelli <ed.tirelli at gmail.com> wrote:

>
>    Drools bytecode generates these beans without generating java source
> code (if you are using the declare, not the data modeller). Having said
> that, it is very simple:
>
> declare Here
>     location: String @key
> end
>
>    Generates a java class roughly equivalent to:
>
> public class Here implements Serializable {
>    private String location;
>
>    public Here() {}
>
>    public Here( String location ) {
>       this.location = location;
>    }
>
>    public String getLocation() { return location; }
>    public void setLocation(String location) { this.location = location; }
>
>    // generates a toString()
>
>    // generates a hashCode()/equals() method that use the location's
> hashcode()/equals()
> }
>
>    I did this from memory, but it is pretty much all it does. Nothing
> complex there, just a javabean really.
>
>    The difference to not using @key is that the hashCode()/equals()
> methods would not take "location" in consideration, and in this case, since
> there are no other attributes, would then rely on system identity.
>
>    Edson
>
>
>
>
>
> On Wed, Feb 26, 2014 at 2:23 PM, profversaggi <profversaggi at gmail.com>wrote:
>
>> I was looking for something along the lines of a method of inspecting the
>> resulting code of any arbitrary @key declarations I might want to deploy.
>> Is
>> there such a way?
>>
>>
>>
>> --
>> View this message in context:
>> http://drools.46999.n3.nabble.com/key-declarations-for-a-type-What-s-under-the-hood-tp4028343p4028346.html
>> Sent from the Drools: User forum mailing list archive at Nabble.com.
>> _______________________________________________
>> rules-users mailing list
>> rules-users at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>
>
>
> --
>   Edson Tirelli
>   Principal Software Engineer
>   Red Hat Business Systems and Intelligence Group
>
>
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>



-- 
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Matthew R. Versaggi, President & CEO
Versaggi Information Systems, Inc.
Adjunct Professor of eBusiness DePaul University
Email: mailto:matt at versaggi.com, ProfVersaggi at gmail.com
M: 630-292-8422
LinkedIn:  http://www.linkedin.com/in/versaggi
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