The minimal requirements are:
> * retrieve the properties of a bean via bean class
> * read a property value from a bean via bean instance and property name
> * write a property value in a bean via bean instance, property name and
> value
> * determine the type of a property via bean class and property name
>
> One final to add:
* create a new instance of the bean via bean class [uses (public) non-arg
constructor].
> I see two problems to discuss:
> 1. There is no common Java API for bean introspection that is suitable
> here. We should check if there is one that is most commonly accepted or
> wheter we should create a new one.
> However, the API should be more on the scope of a JSR (I do not want to
> make it too complicated and go for a real JSR) and not be inside a
> gwt-user.jar that many architects do not want to see on the server as a
> dependency for common code modules.
> 2. How to determine which beans to support in the GWT reflection?
> Supporting all beans would be too much overhead. Requiring GWT.create for
> each bean would conflict with other purposes of generation as unfortunately
> GWT.create does not take the expected result type as 2nd arg. So maybe
> something like configurable marker interfaces might be a solution. Also
> java.io.Serializable could be a candidate.
>
One thing to add here:
The full JDK implementation of the Relection API should be able to deal
with generics and should therefore accept java.lang.reflect.Type. This way
one could also provide a generic type and resolve the real type of a
generic property. E.g.:
public class MyGenericBean<T> {
private T value;
public T getValue() {
return this.value;
}
public void setValue(T value) {
this.value = value;
}
}
Then
Type type = getTypeOf("MyGenericBean<Integer>");
Type propertyType = reflectionUtil.getPropertyType(type, "value");
should result in the propertyType Integer.
This should not be supported in GWT environments but the API should not
prevent such usage in regular JREs.
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