Method toGenericType

output/java_guava/1.4.19/TypeToken.java:1088–1111

Returns the type token representing the generic type declaration of cls. For example: TypeToken.getGenericType(Iterable.class) returns Iterable . If cls isn't parameterized and isn't a generic array, the type token of the class is returned.

(Class<T> cls)

   */

  @VisibleForTesting
  static <T> TypeToken<? extends T> toGenericType(Class<T> cls) {
    if (cls.isArray()) {
      Type arrayOfGenericType = Types.newArrayType(
              // If we are passed with int[].class, don't turn it to GenericArrayType
        toGenericType(cls.getComponentType()).runtimeType);
      @SuppressWarnings("unchecked") // array is covariant
      TypeToken<? extends T> result = (TypeToken<? extends T>) of(arrayOfGenericType);
      return result;
    }
    TypeVariable<Class<T>>[] typeParams = cls.getTypeParameters();
    Type ownerType =
      cls.isMemberClass() && !Modifier.isStatic(cls.getModifiers())
        ? toGenericType(cls.getEnclosingClass()).runtimeType
        : null;
    if ((typeParams.length > 0)
        || ((ownerType != null) && ownerType != cls.getEnclosingClass())) {
      @SuppressWarnings("unchecked") // Like, it's Iterable<T> for Iterable.class
      TypeToken<? extends T> type = (TypeToken<? extends T>) of(Types.newParameterizedTypeWithOwner(ownerType, cls, typeParams));
      return type;
    } else {
      return of(cls);
    }
  }


  private TypeToken<? super T> getSupertypeFromUpperBounds(Class<? super T> supertype, Type[] upperBounds) {