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.beam.runners.dataflow.worker.status;
  
  import java.io.IOException;
  import javax.servlet.ServletException;
  import javax.servlet.http.HttpServlet;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Strings;
  
  /** Base class for status servlets. */
  public abstract class BaseStatusServlet extends HttpServlet {
  
    private final String path;
  
    protected BaseStatusServlet(String path) {
      this.path = path.startsWith("/") ? path : "/" + path;
    }
  
    /** Return the path that this servlet should listen on. */
    public String getPath() {
      return path;
    }
  
    /**
     * Return the servlet that this path is on, modified to include the specified query {@code
     * parameters} if any.
     */
    protected String getPath(String parameters) {
      if (Strings.isNullOrEmpty(parameters)) {
        return path;
      } else {
        return path + "?" + parameters;
      }
    }
  
    @Override
    protected abstract void doGet(HttpServletRequest request, HttpServletResponse response)
        throws IOException, ServletException;
  }
  