// Copyright 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package com.google.sps.data;

import javax.servlet.http.HttpServletRequest;

/** Servlets Utility Class. */
public final class HttpServletUtils {
  
  private HttpServletUtils() {
    throw new java.lang.UnsupportedOperationException("Utility class cannot be instantiated");
  }

  /**
   * Return the request parameter or the default value if the parameter
   * was not specified by the client
   */
  public static String getParameter(HttpServletRequest request, String name, String defaultValue) {
    // Null check
    if (request == null) {
      return defaultValue;
    }
    
    String value = request.getParameter(name);
    if (value == null || value.isEmpty()) {
      return defaultValue;
    }
    return value;
  }
}
Add servlet utility class