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package mining;
import java.io.IOException;
import java.io.StringWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import org.apache.commons.io.Charsets;
import org.apache.commons.io.IOUtils;
import org.json.JSONException;
import org.json.JSONObject;
/**
* Performs an API Request.
*
* @author Peter Wu
*/
public abstract class AbstractRequester implements Requester {
@Override
public JSONObject getJSON(String resource) throws IOException {
HttpURLConnection conn = open(buildUrl(resource));
preconnect(conn);
if (conn.getResponseCode() != 200) {
// TODO: print more helpful details
throw new IOException("Unexpected response code");
}
return getResponseAsJson(conn);
}
protected final URL buildUrl(String resource) throws IOException {
String spec = "https://api.twitter.com/1.1/";
// TODO: detect API version? For example, drop 1.1 for oauth2/token
spec += resource;
return new URL(spec);
}
/**
* Opens a connection to the URL.
*/
protected final HttpURLConnection open(URL url) throws IOException {
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
// set default param: fail if no response within 5 seconds
conn.setReadTimeout(5000);
return conn;
}
/**
* Reads the response body from a connection (in JSON format).
*/
protected final JSONObject getResponseAsJson(URLConnection conn)
throws IOException {
StringWriter writer = new StringWriter();
IOUtils.copy(conn.getInputStream(), writer, Charsets.UTF_8);
try {
return new JSONObject(writer.toString());
} catch (JSONException ex) {
// treat JSON errors as if an I/O error occurred
throw new IOException(ex);
}
}
/**
* Prepare the request before it gets send.
*
* @param conn A connection for the request.
* @throws java.io.IOException on failing to prepare the request.
*/
protected abstract void preconnect(URLConnection conn)
throws IOException;
}
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