I think it would be better to use a JsArrayListAdapter in order to prevent
making copies all over the place, and also making mutations write-through
on both sides e.g.
public class JsArrayListAdapter<T> extends AbstractList<T> {
public JsArrayListAdapter(ArrayLike<T> blah) {
this.array = blah;
}
// implement List methods to delegate to Array methods
}
To keep referential integrity, you need to use an expando or ES6 Symbol
property to hide a backreference.
That is, JsArrayListAdapter.wrap(nativeJsArray) ==
JsArrayListAdapter.wrap(nativeJsArray2) IFF nativeJsArray == nativeJsArray2.
This technique is less error prone IMHO if you are going to have mutable
objects. If you're using immutables, then making copies is superior.
On Tue, May 9, 2017 at 3:24 PM 'Goktug Gokdogan' via GWT Contributors <
[email protected]> wrote:
> Yes, theoretically you should be able to use the second parameter on
> Json.parse Json.stringify for conversion back and forth between java
> collections and js primitives. In this model, your javascript code needs to
> use Java collection APIs.
>
> > java.util.Arrays.asList() should be enough
>
> keep in mind that Arrays.asList won't let you go out of bounds.
>
>
>
> > I believe it was in plans with @JsConvert
>
>
> We are not working on @JsConvert right now. JsConvert is just convenience
> and you can mimic it:
>
>
> @JsType(isNative=true)
> interface MyType {
> @JsConvert(ListConverter.class)
> List getMyArray()
> void setMyArray(@JsConvert(ListConverter.class) List array)
> }
>
> is roughly equivalent to:
>
> @JsType(isNative=true)
> interface MyType {
> @JsProperty(name="myArray")
> Object[] getMyArrayInternal();
>
> @JsOverlay
> default List getMyArray() { return Arrays.asList(getMyArray()); }
>
> @JsProperty(name="myArray")
> void setMyArrayInternal(Object[] array);
>
> @JsOverlay
> default void setMyArray(List list) {
> setMyArrayInternal(array.toArray());
> }
> }
>
>
> On Tue, May 9, 2017 at 9:32 AM, Thomas Broyer <[email protected]> wrote:
>
>>
>>
>> On Tuesday, May 9, 2017 at 4:34:48 PM UTC+2, Marcin Okraszewski wrote:
>>>
>>> There is indeed something in it. Actually you could have some type of
>>> naming convention, like in TJSON (
>>> https://tonyarcieri.com/introducing-tjson-a-stricter-typed-form-of-json)
>>> or TypedJson (https://www.npmjs.com/package/typed-json) to figure out
>>> proper types. But then I would need to create eg. ArrayList with the
>>> Manuel's trick (the asList() from Polymer). I'll test it.
>>>
>>
>> java.util.Arrays.asList() should be enough actually:
>> https://github.com/gwtproject/gwt/blob/2.8.1/user/super/com/google/gwt/emul/java/util/Arrays.java#L136
>> (note that the ArrayList there is not java.util.ArrayList, it's an internal
>> java.util.Arrays.ArrayList class that directly wraps the array with no
>> copy).
>>
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