[Neo] Relation properties

Mattias Persson mattias at neotechnology.com
Thu Jan 28 21:01:40 CET 2010


Not at all, you're not the first one to overlook that inheritance!

2010/1/28, Anton Popov <popov.UA.work at gmail.com>:
> Thanks for a quick answer, Mattias.
>
> Sorry for a stupid questions, just haven't noticed the inheritance of
> Relationship interface.
>
> On 28 January 2010 19:43, Mattias Persson <mattias at neotechnology.com> wrote:
>
>> Relationship has all the property methods, just like Node... they're
>> actually on PropertyContainer (a common super interface to Node and
>> Relationship) see
>> http://api.neo4j.org/current/org/neo4j/graphdb/Relationship.html and
>> http://api.neo4j.org/current/org/neo4j/graphdb/PropertyContainer.html
>> for more information.
>>
>> So to manage the cost in a dijkstra algorithm you can use whatever
>> property key, f.ex. "weight", like this:
>>
>>    Relationship rel = ... // any relationship
>>    rel.setProperty( "weight", 4 );
>>
>> And if you're using the Dijkstra algorithms in the "neo4j-graph-algo"
>> component, http://components.neo4j.org/neo4j-graph-algo/ , you can
>> instantiate it with a CostEvaluator instance something like this:
>>
>>    new CostEvaluator<Integer>()
>>    {
>>        CostType getCost( Relationship relationship, boolean backwards )
>>        {
>>            / TODO Handle backwards flag?
>>            return ( Integer ) relationship.getProperty( "weight", 1 );
>>        }
>>    }
>>
>> ...and pass it to your Dijkstra algo instance.
>>
>> Is this what you were looking for?
>>
>> 2010/1/28 Anton Popov <popov.UA.work at gmail.com>:
>> > Hello everyone,
>> >
>> > Is there any possibility to assign properties to Relations?
>> > The matter is I want to try Dijkstra algorithm performance on some
>> weighted
>> > directed graph and don't know where to put weight actually...
>> >
>> > --
>> > Best regards,
>> > Popov Anton
>> > _______________________________________________
>> > Neo mailing list
>> > User at lists.neo4j.org
>> > https://lists.neo4j.org/mailman/listinfo/user
>> >
>>
>>
>>
>> --
>> Mattias Persson, [mattias at neotechnology.com]
>> Neo Technology, www.neotechnology.com
>> _______________________________________________
>> Neo mailing list
>> User at lists.neo4j.org
>> https://lists.neo4j.org/mailman/listinfo/user
>>
>
>
>
> --
> Best regards,
> Popov Anton
> _______________________________________________
> Neo mailing list
> User at lists.neo4j.org
> https://lists.neo4j.org/mailman/listinfo/user
>


-- 
Mattias Persson, [mattias at neotechnology.com]
Neo Technology, www.neotechnology.com


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