ProductClient.java

public class ProductClient {
    public ProductClient(Configuration config, RestTemplate restTemplate) {
        ...
    }
    
    public Iterator<List<Product>> fetchAllProducts() {
        return new ResponseIterator();
    }
    
    private class ResponseIterator implements Iterator<List<Product>> {
        private String nextPage;

        public ResponseIterator() {
            nextPage = "/products";
        }

        @Override
        public boolean hasNext() {
            return nextPage != null;
        }

        @Override
        public List<Product> next() {
            if (!hasNext()) {
                throw new NoSuchElementException("Reached the last page of the API response.");
            }
            ResponseEntity<ProductsResponse> entity = invokeGetAllProductsEndpoint(nextPage);
            nextPage = entity.getBody().getNextPageRequestPath();
            List<Product> ProductsInThisPage = entity.getBody().getProducts();
            return ProductsInThisPage;
        }
    }
    
    private ResponseEntity<ReviewsResponse> invokeGetAllProductsEndpoint(String endPoint) {
        String url = "https://example.com" + endPoint;
        return restTemplate.getForEntity(url, ProductsResponse.class);
    }
}