I just wanted to share something I just realized...
Today I've been looking at the Functors API in commons-collections to
see how that is applicable to the Traverser API in Neo. The one thing
I was missing in the Traverser API was Transformer. There are two
Predicate-like interfaces in the StopEvaluator and ReturnEvaluator but
I miss something like the Transformer interface. As I was playing
around with this I realized (as maybe many of you have done) that
there indeed is something Transformer-like in Neo, namely
IterableWrapper (in neo-utils). Up until now I've only used this for
things like this:
public Iterable<Receiver> getRecieversOfDonations() {
Traverser traverser = ... //My traverser that returns
RecieverNodes
return new IterableWrapper<Receiver, Node>(traverser) {
@Override
protected Receiver underlyingObjectToObject(Node
object) {
return new ReceiverNode(object);
}
};
}
What I realized today is that this is more powerful than that, and
that I can do whatever I want with it, for example:
Iterable<SomeBean> iterable = new IterableWrapper<SomeBean,
Node>(traverser){
@Override
protected SomeBean underlyingObjectToObject(Node node) {
CreditNode creditNode = new CreditNode(node);
DateTime createdDateTime = creditNode.getCreatedDateTime();
Relationship someRelationship = creditNode
.getSingleRelationship(...);
CreditNode someOtherCredit = new CreditNode(someRelationship
.getStartNode());
AnotherNode anotherNode = new
AnotherNode(someOtherCredit.traverse(...)
.iterator().next());
return new SomeBean(
createdDateTime,
someOtherCredit.getSomething(),
anotherNode.getName(), creditNode.getSomething());
}
};
When used like this the name may be somewhat inaccurate
(IterableTransformer?), but I think this is really powerful. What do
you think?
Best regards, Mattias Ask
-------------------------------------------
Jayway AB, +46 701 469284
www.jayway.com
Jayway is the founder of Öredev and Qi4J
www.oredev.org
www.qi4j.org
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