content: /**
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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
   *
   *     http://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 org.apache.ambari.view.hello;
  
  import org.apache.ambari.view.ViewContext;
  
  import jakarta.servlet.ServletConfig;
  import jakarta.servlet.ServletContext;
  import jakarta.servlet.ServletException;
  import jakarta.servlet.http.HttpServlet;
  import jakarta.servlet.http.HttpServletRequest;
  import jakarta.servlet.http.HttpServletResponse;
  import java.io.IOException;
  import java.io.PrintWriter;
  import java.util.Map;
  
  /**
   * Simple servlet for hello view.
   */
  public class HelloServlet extends HttpServlet {
  
    /**
     * The view context.
     */
    private ViewContext viewContext;
  
    @Override
    public void init(ServletConfig config) throws ServletException {
      super.init(config);
  
      ServletContext context = config.getServletContext();
      viewContext = (ViewContext) context.getAttribute(ViewContext.CONTEXT_ATTRIBUTE);
    }
  
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
      response.setContentType("text/html");
      response.setStatus(HttpServletResponse.SC_OK);
  
      PrintWriter writer = response.getWriter();
  
      Map<String, String> properties = viewContext.getProperties();
  
      String name = properties.get("name");
      if (name == null) {
        name = viewContext.getUsername();
        if (name == null || name.length() == 0) {
          name = "world";
        }
      }
      writer.println("<h1>Hello " + name + "!</h1>");
    }
  }
  
  