Java Code Examples for javax.microedition.io.HttpConnection#HTTP_OK

/**
 * Finds the type of the content in this Invocation.
 * <p>
 * The calling thread blocks while the type is being determined.
 * If a network access is needed there may be an associated delay.
 *
 * @return the content type.
 *          May be <code>null</code> if the type can not be determined.
 *
 * @exception IOException if access to the content fails
 * @exception IllegalArgumentException if the content is accessed via
 *  the URL and the URL is invalid
 * @exception SecurityException is thrown if access to the content
 *  is required and is not permitted
 */
String findType() throws IOException, SecurityException {
    String type = null;
    Connection conn = openPrim(true);
    if (conn instanceof ContentConnection) {
    	if( conn instanceof HttpConnection ){
    		HttpConnection hc = (HttpConnection)conn;
         hc.setRequestMethod(HttpConnection.HEAD);
	
         // actual connection performed, some delay...
         if (hc.getResponseCode() != HttpConnection.HTTP_OK)
         	return null;
    	}
    	
        type = ((ContentConnection)conn).getType();
        conn.close();

        if (type != null) {
            // Check for and remove any parameters (rfc2616)
            int ndx = type.indexOf(';');
            if (ndx >= 0) {
                type = type.substring(0, ndx);
            }
            type = type.trim();
            if (type.length() == 0) {
                type = null;
            }
        }
    }

    return type;
}
 

/**
 * {@inheritDoc}
 */
public void run() {
  try {
    // Visit the original download URL and read the JAD;
    // if the MIDlet-Version has changed, invoke the callback.
    String url = Build.DOWNLOAD_URL;
    String applicationVersion = getApplicationVersion();
    String userAgent = getUserAgent();
    String language = getLanguage();
    for (int redirectCount = 0; redirectCount < 10; redirectCount++) {
      HttpConnection c = null;
      InputStream s = null;
      try {
        c = connect(url);
        c.setRequestMethod(HttpConnection.GET);
        c.setRequestProperty("User-Agent", userAgent);
        c.setRequestProperty("Accept-Language", language);

        int responseCode = c.getResponseCode();
        if (responseCode == HttpConnection.HTTP_MOVED_PERM
            || responseCode == HttpConnection.HTTP_MOVED_TEMP) {
          String location = c.getHeaderField("Location");
          if (location != null) {
            url = location;
            continue;
          } else {
            throw new IOException("Location header missing");
          }
        } else if (responseCode != HttpConnection.HTTP_OK) {
          throw new IOException("Unexpected response code: " + responseCode);
        }
        s = c.openInputStream();
        String enc = getEncoding(c);
        Reader reader = new InputStreamReader(s, enc);
        final String version = getMIDletVersion(reader);
        if (version == null) {
          throw new IOException("MIDlet-Version not found");
        } else if (!version.equals(applicationVersion)) {
          Application application = Application.getApplication();
          application.invokeLater(new Runnable() {
            public void run() {
              mCallback.onUpdate(version);
            }
          });
        } else {
          // Already running latest version
        }
      } finally {
        if (s != null) {
          s.close();
        }
        if (c != null) {
          c.close();
        }
      }
    }
  } catch (Exception e) {
    System.out.println(e);
  }
}