Add a convenience method for sending an error response using ResponseStatus.

Author: [email protected]

src/main/java/com/google/visualization/datasource/DataSourceHelper.java

@@ -224,6 +224,21 @@ public static void setServletErrorResponse(DataSourceException dataSourceExcepti
     setServletResponse(responseMessage, dataSourceRequest, res);
   }
 
+  /**
+   * Sets the HTTP servlet response in case of an error.
+   *
+   * @param responseStatus The response status.
+   * @param dataSourceRequest The data source request.
+   * @param res The http servlet response.
+   *
+   * @throws IOException In case an error happened trying to write the response to the servlet.
+   */
+  public static void setServletErrorResponse(ResponseStatus responseStatus,
+      DataSourceRequest dataSourceRequest, HttpServletResponse res) throws IOException {
+    String responseMessage = generateErrorResponse(responseStatus, dataSourceRequest);
+    setServletResponse(responseMessage, dataSourceRequest, res);
+  }
+
   /**
    * Sets the HTTP servlet response in case of an error.
    *