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

[Dan Allen (JIRA)]

Provide utility to check if Type is assignable to another Type
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                 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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