[weld-issues] [JBoss JIRA] Commented: (WELDX-188) Provide utility to check if Type is assignable to another Type

[Dan Allen (JIRA)]

    [ https://jira.jboss.org/browse/WELDX-188?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12561942#action_12561942 ] 

Dan Allen commented on WELDX-188:
---------------------------------

I'm creating producer methods to satisfy injection points with narrowed types. I want to be able to determine if the type at the injection point is more specific than a type I've already registered. If so, I want to keep the most specific type as it will cover both cases.

Example:

@RequestParam("width") Integer w;

@RequestParam("height") Number h;

Integer is more specific and that's the producer I need.

This case is simple, but my provider must be able to deal generically w/ parameterized types at the injection point.

> Provide utility to check if Type is assignable to another Type
> --------------------------------------------------------------
>
>                 Key: WELDX-188
>                 URL: https://jira.jboss.org/browse/WELDX-188
>             Project: Weld Extensions
>          Issue Type: Feature Request
>            Reporter: Dan Allen
>            Priority: Minor
>             Fix For: 1.0.0.Beta2
>
>
> Often times when writing an extension, you need to know if one Type is assignable from another Type. This is a more sophisticated version of Class#isAssignableFrom(Class) which takes into account paramaterized types.
> given
>    parameterized type Bean<N extends Number>
> then
>   type Bean<Number> is assignable from type Bean<Integer>
> One area where this is useful is when checking if a bean type is more specific than another bean type. It's not sufficient to assume the bean type is a simple class.
> Something similar to what is provided by: http://google-gson.googlecode.com/svn-history/r442/trunk/gson/src/main/java/com/google/gson/reflect/TypeToken.java

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