Re: [Springframework-developer] Annotation to validate required bean attributes

[Seth L. <set...@gm...>]

On 6/16/05, Andy Depue <an...@ma...> wrote:
> This is awesome stuff!  How flexible is it?  Take a look at this
> "afterPropertiesSet()":

Well, it's only written to check that a property has been set.  And
'set' is defined as:

- if property is an object, make sure it's not null
- if property is a primitive, make sure it's value isn't either the
default unset value, or the specified unset value

Your checks to see if something is a prototype aren't handled by this
code.  But, it could easily be handled with something like

@@RequiredDependency(singleton=3D"false")

Which would have the semantics you want here.  Of course, this would
be an optional check.  That is, omitting it would not check that
singleton =3D true.

Seth

>=20
> -----
>   public final void afterPropertiesSet() throws Exception
>   {
>     if(getViewPrototypeBeanName() =3D=3D null) {
>       throw new IllegalArgumentException("viewPrototypeBeanName property =
must
> be set.");
>     }
>     if(getBeanFactory() =3D=3D null) {
>       throw new IllegalArgumentException("beanFactory property must be se=
t.");
>     }
>     if(!getBeanFactory().containsBean(getViewPrototypeBeanName())) {
>       throw new IllegalArgumentException("There is no bean in the bean fa=
ctory
> with the given name '" + getViewPrototypeBeanName() + "'");
>     }
>     if(getBeanFactory().isSingleton(getViewPrototypeBeanName())) {
>       throw new IllegalArgumentException("View bean '" +
> getViewPrototypeBeanName() + "' must be a prototype (singleton=3D\"false\=
").");
>     }
>     if(!View.class.isAssignableFrom(getBeanFactory().getType(getViewProto=
typeBeanName())))
> {
>       throw new IllegalArgumentException("Prototype View bean '" +
> getViewPrototypeBeanName() + "' does not implement the View interface.");
>     }
>   }
> -----
>=20
> I would love to do away with this method entirely by just annotating the
> class.
>=20
>   - Andy
>