Preprocessor for Array Insertion

[ManueGE]

May it possible adding a preprocessor/postprocessor to make some changes before/after inserting an array of objects?

I mean, something like this:

public class ArrayPreProcessor implements PreProcessor<List<MyClass>> {

    @Override
    public void preDeserialize(Class<? extends List<MyClass>> clazz, JsonElement src, Gson gson) {
         // whatever
    }

Any chance to be added in the future?

[julman99]

Hello,

I don't seem to understand correctly the request. Can you give a more concrete example?

Thanks

[ManueGE]

Sure, let's suppose we have a class User (with id and name). I got this JSON:

[
   {"id": 1, "name": "John"},
   {"id": 2, "name": "Mary"},
   {"id": 3, "name": "Michael"}
]

I can write a PreProcessor/PostProcessor to intercept each one of the jsons within the array before/after convert them to Users, but I would like to have one PreProcessor to intercept the full JSON array at once.

Does it makes more sense?

[julman99]

Oh ok, got it now.

I think the way to do this is to add a new feature to the GsonFireBuilder to allow registering processors to a TypeToken.

So you would do:

gsonFireBuilder.registerPreProcessor(new TypeToken<List<user>>(){}.getType(), /* here the preprocessor */);

I'll play with that approach during the weekend and give you an update here

[ManueGE]

That would be awesome. Thanks :)

[julman99]

I think I found a ~not so pretty~ way to make it work:

Try this:

gsonFireBuilder.registerPreProcessor((Class<List<User>>)new TypeToken<List<User>>(){}.getRawType(), /* here the preprocessor for List<User>*/);

[ManueGE]

Thanks you very much. I'll give it a try :)

You can close the issue.