}

    private static Map<AccessorKey, UpgradedProperty> mapCurrentAccessorsOfUpgradedProperties(List<UpgradedProperty> upgradedProperties) {
        return upgradedProperties.stream().collect(Collectors.toMap(AccessorKey::ofUpgradedProperty, Function.identity()));
    }

    private static Map<AccessorKey, ReplacedAccessor> mapOldAccessorsOfUpgradedProperties(List<UpgradedProperty> upgradedProperties) {
        return upgradedProperties.stream()

        public static AccessorKey of(String containingType, String methodName, String descriptor) {
            return new AccessorKey(containingType, methodName, descriptor);
        }

        public static AccessorKey ofUpgradedProperty(UpgradedProperty upgradedProperty) {
            return new AccessorKey(upgradedProperty.getContainingType(), upgradedProperty.getMethodName(), upgradedProperty.getMethodDescriptor());
        }