@@ -0,0 +1,1320 @@
+// Copyright 2019 Google LLC%0A//%0A// Licensed under the Apache License, Version 2.0 (the %22License%22);%0A// you may not use this file except in compliance with the License.%0A// You may obtain a copy of the License at%0A//%0A//     https://www.apache.org/licenses/LICENSE-2.0%0A//%0A// Unless required by applicable law or agreed to in writing, software%0A// distributed under the License is distributed on an %22AS IS%22 BASIS,%0A// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.%0A// See the License for the specific language governing permissions and%0A// limitations under the License.%0A%0Apackage com.google.sps.data;%0A%0Aimport javax.servlet.http.HttpServletRequest;%0A%0A/** Servlets Utility Class. */%0Apublic final class HttpServletUtils %7B%0A  %0A  private HttpServletUtils() %7B%0A    throw new java.lang.UnsupportedOperationException(%22Utility class cannot be instantiated%22);%0A  %7D%0A%0A  /**%0A   * Return the request parameter or the default value if the parameter%0A   * was not specified by the client%0A   */%0A  public static String getParameter(HttpServletRequest request, String name, String defaultValue) %7B%0A    // Null check%0A    if (request == null) %7B%0A      return defaultValue;%0A    %7D%0A    %0A    String value = request.getParameter(name);%0A    if (value == null %7C%7C value.isEmpty()) %7B%0A      return defaultValue;%0A    %7D%0A    return value;%0A  %7D%0A%7D

Add servlet utility class