Re: JsInterop and Java collections?

When you think about it, other Java APIs (jaxb, jpa, Jackson) do go the extra mile to accommodate Java collections

Well kind of bad comparison right? These Java APIs either serialize/deserialize based on a defined principle or stay in Java land anyways. 

 

, and the example above looks like can be exported to js object (could use a helper annotation @JsX or two).

You don't "export" Java to JS but instead you consume JS using Java. That means you would need to have a class that implements the Map interface and takes a JS map as constructor parameter. Then you can implement the Java API on top of the JavaScript API. In some cases you can simply delegate to the JS API, in some cases you can't. 

But thats something JsInterop does not do, however nobody stops you from having something like 

@JsType(native = true)
class JsArray<T> {

  // ...get / set / shift / slice / etc...

  @JsOverlay
  Collection<T> asCollection() {
    // Java API on top of JS API
    return new JsArrayCollectionAdapter<>(this);
  }

  @JsOverlay
  List<T> asList() {
    // Java API on top of JS API
    return new JsArrayListAdapter<>(this);
  }
}

@JsType(native = true)
class Something {

  @JsProperty
  JsArray<Person> persons;


  @JsOverlay
  List<Person> getPersons() {
    return persons.asList();
  }

  @JsOverlay
  void setPersons(List<Person> newPersons) {
    // might use ES6 Array.from(newPersons.toArray()) if possible, otherwise fallback to manual copying
    persons = JsUtils.asJsArray(newPersons);
    // alternatively do it through the adapter
    List<Person> adapter = persons.asList();
    adapter.clear();
    adapter.addAll(newPersons);
  }
}

-- J.

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