Re: [jboss-dev] generic collection item type
configuration.getTypeInfo(...) may be a wrong way to load a generic type
but even if I declare a field of type JBossEnterpriseBeansMetaData and
Field beans = getClass().getDeclaredField("beans");
Type beansGType = beans.getGenericType();
ClassInfo classInfo = (ClassInfo) configuration.getTypeInfo(beansGType);
the result will be the same.
Alexey
Alexey Loubyansky wrote:
No, it won't.
This
ClassInfo classInfo = (ClassInfo)
configuration.getTypeInfo(JBossEnterpriseBeansMetaData.class);
System.out.println("isCollection: " + classInfo.isCollection());
System.out.println("type args: " +
classInfo.getActualTypeArguments());
System.out.println("superclass args: " +
Arrays.asList(classInfo.getGenericSuperclass().getActualTypeArguments()));
results in
isCollection: true
type args: null
superclass args:
[ReflectClassInfoImpl(a)f38798{name=org.jboss.ejb.metadata.spec.EnterpriseBeanMetaData},
ReflectClassInfoImpl(a)4b222f{name=org.jboss.ejb.metadata.jboss.JBossEnterpriseBeanMetaData},
ReflectClassInfoImpl(a)b169f8{name=org.jboss.ejb.metadata.spec.EnterpriseBeansMetaData}]
Ales Justin wrote:
> This is not just Collection specific.
>
> Doing this (TypeInfo[] types = typeInfo.getActualTypeArguments();) on
> JBossEnterpriseBeansMetaData would return you those 3 types:
>
> (pseudo code ;-)
> types[] = {EnterpriseBeanMetaData, JBossEnterpriseBeanMetaData,
> EnterpriseBeansMetaData};
>
> Rgds, Ales
>
> >>>
>
> This approach assumes that the component type can be determined with
>
> TypeInfo[] types = typeInfo.getActualTypeArguments();
> if (types != null)
> elementType = types[0];
>
> This won't work for this class
>
https://svn.jboss.org/repos/common/jbossxb-builder/trunk/src/test/java/or...
>
>
> for which its super class should be checked for type arguments and the
> component type is the second argument.
>
> I guess I'll need to specify the component type with an annotation. But
> it would be nice to have something like Class.getComponentType() to work
> for generic collections too.
>
> Alexey
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