LocationQueryService.java

package edu.ucsb.cs156.spring.backenddemo.services;


import java.util.List;
import java.util.Map;

import org.springframework.boot.web.client.RestTemplateBuilder;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Service;
import org.springframework.web.client.HttpClientErrorException;
import org.springframework.web.client.RestTemplate;
import lombok.extern.slf4j.Slf4j;


@Slf4j
@Service
public class LocationQueryService {

    private final RestTemplate restTemplate;

    public LocationQueryService(RestTemplateBuilder restTemplateBuilder) {
	//todo
        restTemplate = restTemplateBuilder.build();
    }

    public static final String ENDPOINT = "https://nominatim.openstreetmap.org/search.php?q={location}&format=jsonv2";

    public String getJSON(String location) throws HttpClientErrorException {
	//todo
        //return "";
	log.info("location={}", location);
        HttpHeaders headers = new HttpHeaders();
        headers.setAccept(List.of(MediaType.APPLICATION_JSON));
        headers.setContentType(MediaType.APPLICATION_JSON);

        HttpEntity<String> entity = new HttpEntity<>(headers);

        Map<String, String> uriVariables = Map.of("location", location);

        ResponseEntity<String> re = restTemplate.exchange(ENDPOINT, HttpMethod.GET, entity, String.class,
                uriVariables);
        return re.getBody();	
    }
}