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 com.alibaba.jstorm.hdfs.bolt.format;
  
  
  import backtype.storm.task.TopologyContext;
  
  import java.util.Map;
  
  
  /**
   * Creates file names with the following format:
   * <pre>
   *     {prefix}{componentId}-{taskId}-{rotationNum}-{timestamp}{extension}
   * </pre>
   * For example:
   * <pre>
   *     MyBolt-5-7-1390579837830.txt
   * </pre>
   *
   * By default, prefix is empty and extenstion is ".txt".
   *
   */
  public class DefaultFileNameFormat implements FileNameFormat {
      private String componentId;
      private int taskId;
      private String path = "/storm";
      private String prefix = "";
      private String extension = ".txt";
  
      /**
       * Overrides the default prefix.
       *
       * @param prefix
       * @return
       */
      public DefaultFileNameFormat withPrefix(String prefix){
          this.prefix = prefix;
          return this;
      }
  
      /**
       * Overrides the default file extension.
       *
       * @param extension
       * @return
       */
      public DefaultFileNameFormat withExtension(String extension){
          this.extension = extension;
          return this;
      }
  
      public DefaultFileNameFormat withPath(String path){
          this.path = path;
          return this;
      }
  
      public void prepare(Map conf, TopologyContext topologyContext) {
          this.componentId = topologyContext.getThisComponentId();
          this.taskId = topologyContext.getThisTaskId();
      }
  
      @Override
      public String getName(long rotation, long timeStamp) {
          return this.prefix + this.componentId + "-" + this.taskId +  "-" + rotation + "-" + timeStamp + this.extension;
      }
  
      public String getPath(){
          return this.path;
      }
  }
  