creating new object inside a stream and use the setters

Question

I am trying to create an object inside the stream but I do not want to define another constructor for the object; I would like to use the setters to put the values where needed. Is this possible?

pe.setExts(pDTO.getExts().stream().map(s->new P(arg1, arg2, ..., arg12)))...;

As you can see I have a lot of arguments and some of them requires some processing. I want to avoid doing this processing until it is necessary.

What I am looking for may be something like this (I am not sure how to write the function; I think an anonymous function would be great here):

pe.setExts(pDTO.getExts().stream().map(s->{ P p = new P(); s->setExt1(p.getExt1()); ... List<V> l = p.getExt12(); List<X> finalL = null; [processing list l, populating finalL] s->setExt12(finalL); }));

Konstantin Yovkov · Accepted Answer · 2015-04-03 08:28:12Z

3

You can't use a constructor that's not there.

I'd suggest to write a method that would take the s variable and return a P one. Something like:

public static P generatePfromS(S s) { //convert S to P }

and then you can just do:

pe.setExts(pDTO.getExts().stream().map(YourClass::generatePFromS).collect(toList()));

answered Apr 3, 2015 at 8:28

Konstantin Yovkov

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2 Comments

tzortzik Over a year ago

I think my classes don't need to know about each other. One is P and the other one is a data transfer object PDTO. Doing your way, it means to create a third class which will contain that conversion method. Another thing here is that I am trying to use this stream inside a PPDTOAdapter. Or should I create that method inside the adapter and call it from there?

tzortzik Over a year ago

Based on your solution, I've given myself the answer in my previous comment. Thank you!

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