Comment #9 on issue 771 by [email protected]:
Annotations.isAllDefaultMethods returns false for method less interfaces.
http://code.google.com/p/google-guice/issues/detail?id=771
I have a key that represents a type and either an Annotation or a Class<?
extends Annotation>
I want to create a new key for a different class that has the same
Annotation or Class<? extends Annotation>
This sounds exactly like Key.ofType:
"Returns a new key of the specified type with the same annotation as this
key"
Using your previous example you could rewrite it as:
private static Key<?> findDependencyKey(TypeLiteral<?> type, Key<?>
clazzKey) {
return classKey.ofType(type);
}
and if you want to guarantee there is at least an annotation instance or
marker then use:
private static Key<?> findDependencyKey(TypeLiteral<?> type, Key<?>
clazzKey) {
if (classKey.getAnnotationType() != null) {
return classKey.ofType(type);
} else {
throw new ProviderException("Neither annotation nor annotation type
found!");
}
}
because Key.getAnnotationType() will only return null when there's no
annotation instance or marker.
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