Tuesday, March 29, 2011

Re: JavaScriptObject array for Java Objects

Anyone? So far I'm pushing Java POJO's into JSO arrays with no
problems but would like to make sure that this is safe.

Many thanks.

On 27 mar, 18:25, Javier <javierferre...@gmail.com> wrote:
> In my app I use JsArray extensively to store my overlays. I use
> java.util.List to store my client-side Java POJOs.
>
> For performance reasons and to unify the way I access my model I
> planned to eliminate the Lists and use only JSO wrappers. Given a
> wrapper around a native array that can store any Java Object:
>
> public class JsArrayObject<T> extends JavaScriptObject {
>
> protected JsArrayObject() {}
>
> public final native T get(int index) /*-{
>     return this[index];
>
> }-*/;
>
> public final native void push(T value) /*-{
>     this[this.length] = value;
>
> }-*/;
> }
>
> Is it safe to store Java Objects this way? The doc says that when you
> pass a Java Object into JavaScript the result is "an opaque value
> accessible through special syntax". This sounds confussing to me. For
> instance if I push an Integer and try to get it an exception will be
> thrown because something different than an Object was found (at least
> in dev mode). The same happens with the rest of Java primitive
> Wrappers. Apart from the problems with Java primitive Wrappers, are
> there other concerns to be aware?
>
> Many thanks

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