Obtain Place location by Google Maps CID

MetadataExtractor.java

import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;

import java.io.IOException;

import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import okhttp3.ResponseBody;

public class MetadataExtractor {

  private static final String META_ITEMPROP_NAME = "meta[itemprop=name]";
  private static final String META_PROPERTY_OG_TITLE = "meta[property=og:title]";
  private static final String META_PROPERTY_OG_SITE_NAME = "meta[property=og:site_name]";
  private static final String CONTENT = "content";

  private final OkHttpClient httpClient;

  public MetadataExtractor() {
    this.httpClient = new OkHttpClient();
  }

  /**
   * Send request, retrieve response, parse response body to extract meta-data with place name.
   *
   * @param url <ul>
   *            <li>https://maps.google.com/?cid=13226830714359798441</li>
   *            <li>https://www.google.com/maps?cid=13226830714359798441</li>
   *            </ul>
   */
  public Metadata extract(String url) {
    // send request
    final Request request = new Request.Builder().url(url).build();
    try (final Response response = httpClient.newCall(request).execute()) {
      if (!response.isSuccessful()) {
        throw new RuntimeException("Request failed: " + response.code());
      }

      Metadata retval = null;
      final ResponseBody body = response.body();
      if (null != body) {

        final String html = body.string();
        final Document doc = Jsoup.parse(html);

        final String name = getMetaContent(doc, META_ITEMPROP_NAME);
        final String title = getMetaContent(doc, META_PROPERTY_OG_TITLE);
        final String siteName = getMetaContent(doc, META_PROPERTY_OG_SITE_NAME);

        retval = new Metadata(name, title, siteName);
      }
      return retval;
    } catch (IOException ioe) {
      throw new RuntimeException(ioe);
    }
  }

  /**
   * Get an attribute value from the first matched element that has the attribute.
   */
  private String getMetaContent(Document doc, String selector) {
    return doc.select(selector).attr(CONTENT);
  }

  public static class Metadata {
    public final String name;
    public final String title;
    public final String siteName;

    public Metadata(String name, String title, String siteName) {
      this.name = name;
      this.title = title;
      this.siteName = siteName;
    }
  }
}