[weld-issues] [JBoss JIRA] Commented: (WELDX-188) Provide utility to check if Type is assignable to another Type
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https://jira.jboss.org/browse/WELDX-188?page=com.atlassian.jira.plugin.sy...
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Dan Allen commented on WELDX-188:
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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
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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/ja...
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