java.util.Map with Javascript Overlay example?

[rhodebump]

Can anyone point me to an example in which someone uses Javascript
Overlays to create a java.util.Map. I've tried, but keep getting a

java.lang.ClassCastException:
com.google.gwt.core.client.JavaScriptObject$ cannot be cast to
java.util.Map


Is it even possible? Or am I limited to using a JsArray?

Thanks!

[André Moraes]

In JavaScript world, almost everything is a Dictionary.

If you simply need a dictionary, just use a JavaScriptObject.
Here is a example:

public final native void setValue(String key, String value) /*-{
this[key] = value;
}-*/;

private native static JavaScriptObject _createInstance() /*-{
var obj = new Object
return obj
}-*/;

I think the _createInstance isn't required, but I don't tested.

[Dean S. Jones]

look at the implementation of FastStringMap

http://code.google.com/p/google-web-toolkit/source/browse/trunk/user/src/com/google/gwt/user/client/ui/FastStringMap.java?r=931