//package com.MetroMinder.Utilities;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
public class UrlHelpers {
/* {@link StatusLine} HTTP status code when no server error has occurred. */
private static final int HTTP_STATUS_OK = 200;
/* Shared buffer used by {@link #getUrlContent(String)} when reading results
* from an API request. */
private static byte[] sBuffer = new byte[512];
/* Thrown when there were problems contacting the remote API server, either
* because of a network error, or the server returned a bad status code. */
public static class ApiException extends Exception
{
public ApiException(String detailMessage, Throwable throwable)
{
super(detailMessage, throwable);
}
public ApiException(String detailMessage)
{
super(detailMessage);
}
}
/* Thrown when there were problems parsing the response to an API call,
* either because the response was empty, or it was malformed. */
public static class ParseException extends Exception
{
public ParseException(String detailMessage, Throwable throwable)
{
super(detailMessage, throwable);
}
}
/* Read and return the full HTML content of the URL requested
* @param urlToFetch
* @return Exact content of page.
* @throws ApiException If any connection or server error occurs.
* @throws ParseException If there are problems parsing the response. */
public static String getPageContent(String urlToFetch) throws ApiException, ParseException
{
return getUrlContent(String.format(urlToFetch));
}
/* Pull the raw text content of the given URL. This call blocks until the
* operation has completed, and is synchronized because it uses a shared
* buffer {@link #sBuffer}.
* @param url The exact URL to request.
* @return The raw content returned by the server.
* @throws ApiException If any connection or server error occurs. */
protected static synchronized String getUrlContent(String url) throws ApiException
{
// Create client and set our specific user-agent string
HttpClient client = new DefaultHttpClient();
HttpGet request = new HttpGet(url);
request.setHeader("User-Agent", "MetroMinder (Linux; Android)");
try
{
HttpResponse response = client.execute(request);
// Check if server response is valid
StatusLine status = response.getStatusLine();
if (status.getStatusCode() != HTTP_STATUS_OK)
{
throw new ApiException("Invalid response from server: " + status.toString());
}
// Pull content stream from response
HttpEntity entity = response.getEntity();
InputStream inputStream = entity.getContent();
ByteArrayOutputStream content = new ByteArrayOutputStream();
// Read response into a buffered stream
int readBytes = 0;
while ((readBytes = inputStream.read(sBuffer)) != -1)
{
content.write(sBuffer, 0, readBytes);
}
// Return result from buffered stream
return new String(content.toByteArray());
}
catch (IOException e)
{
throw new ApiException("Problem communicating with API", e);
}
}
}