Is this code convertible to a lambda style?

[Marcos Antonio]

I'd been trying a little more and maybe this is the solution I was looking for (I haven't tested it yet).

return getMetadataReader().getPropertyDescriptors().stream().
    filter(d -> d.getType() == PropertyType.ENTITY).
    filter(d -> DataFactory.getInstance().getMetadataReader(d.getReaderMethod().getReturnType()).
        getCollectionDescriptors().stream().
        anyMatch(c -> c.isChildAssociation(d))).
    findFirst().
    map(d -> d.convertToProperty()).
    orElse(null);

Does it look right?

Thank you.

Marcos

----------------------------------------
> From: marcos_antonio_ps at hotmail.com
> To: lambda-dev at openjdk.java.net
> Subject: Is this code convertible to a lambda style?
> Date: Tue, 24 Dec 2013 17:48:31 +0300
>
> I'm really having trouble trying to convert this piece of code to lambda style, which makes me think if it is even possible.
>
> Property getParent()
> {
> for (PropertyDescriptor parent : getMetadataReader().getPropertyDescriptors())
> {
> if (parent.getType() == PropertyType.ENTITY)
> {
> MetadataReader metadataReader =
> DataFactory.getInstance().getMetadataReader(parent.getReaderMethod().getReturnType());
> for (CollectionDescriptor collection : metadataReader.getCollectionDescriptors())
> {
> if (collection.isChildAssociation(parent))
> {
> return parent.convertToProperty()
> }
> }
> }
> }
> return null;
> }
>
> I think this code seems very simple but in trying to convert it I'm not able to keep the reference to the parent to later methods in the stream pipeline.
>
> Any help?
>
> Thank you.
>
> Marcos
>