spring_impl.java

import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpMethod;
import org.springframework.http.ResponseEntity;
import org.springframework.web.client.RestTemplate;

import java.util.Objects;

public class RoutePlannerAdapter implements IDUServiceRoutePlanner {
    private final String apiKey;
    private final String baseUrl;

    public RoutePlannerAdapter(String apiKey) {
        this.apiKey = apiKey;
        this.baseUrl = "https://maps.googleapis.com/maps/api/directions/json";
    }

    @Override
    public RouteDetails requestRouteAndEstimates(Address startLocation, Address targetLocation, String transportMeans) {
        // Prepare the request URL
        String url = baseUrl + "?origin=" + encodeAddress(startLocation) +
                     "&destination=" + encodeAddress(targetLocation) +
                     "&mode=" + transportMeans +
                     "&key=" + apiKey;

        // Set up REST template
        RestTemplate restTemplate = new RestTemplate();

        // Make the API call
        ResponseEntity<RouteDetails> responseEntity = restTemplate.exchange(
                url,
                HttpMethod.GET,
                null,
                RouteDetails.class);

        // Check if the response is successful
        if (responseEntity.getStatusCode().is2xxSuccessful()) {
            return Objects.requireNonNull(responseEntity.getBody());
        } else {
            throw new RuntimeException("Failed to retrieve route details: " + responseEntity.getStatusCode());
        }
    }

    // Utility method to encode address for URL
    private String encodeAddress(Address address) {
        return address.getStreet() + ", " + address.getCity() + ", " + address.getPostalCode() + ", " + address.getCountry();
    }
}