How to resolve all actual types in java relative to implementation class of generic class or interface?

Question content

I am trying to resolve all actual types of an implementation class related to a generic class or interface.

I wrote an actualtypeargumentsresolver for this, but it only works if the typename is consistent. I want to ignore typename and get all actual types. How can I achieve this goal?

Any help would be greatly appreciated. Thanks!

@Test
public void testIndirectlyExtendedGenericSuperclassWithDiffTypeName() {

    abstract class AbstractClass3<AAA, BBB, CCC> { }

    abstract class AbstractClass2<AA, BB, CC> extends AbstractClass3<CC, Map, BB> { }

    abstract class AbstractClass1<A, B> extends AbstractClass2<Long, A, Boolean> { }

    class Impl extends AbstractClass1<String, Integer> {}

    Type[] arr = ActualTypeArgumentsResolver.resolve(Impl.class, AbstractClass3.class);

    Assert.assertTrue(arr.length == 3);
    Assert.assertEquals(arr[0], Boolean.class);
    Assert.assertEquals(arr[1], Map.class);
    Assert.assertEquals(arr[2], String.class);
}

Solution

guava's typetoken supports this feature. Use the getsupertype method on the typetoken representing impl to get the parameterized version of abstractclass3 along with all actual type parameters.

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