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.net.InetAddress;
  import java.net.UnknownHostException;
  import java.text.SimpleDateFormat;
  import java.util.Date;
  import java.util.Map;
  
  
  public class SimpleFileNameFormat implements FileNameFormat {
  
      private static final long serialVersionUID = 1L;
  
      private String componentId;
      private int taskId;
      private String host;
      private String path = "/storm";
      private String name = "$TIME.$NUM.txt";
      private String timeFormat = "yyyyMMddHHmmss";
  
      @Override
      public String getName(long rotation, long timeStamp) {
          // compile parameters
          SimpleDateFormat dateFormat = new SimpleDateFormat(timeFormat);
          String ret = name
                  .replace("$TIME", dateFormat.format(new Date(timeStamp)))
                  .replace("$NUM", String.valueOf(rotation))
                  .replace("$HOST", host)
                  .replace("$COMPONENT", componentId)
                  .replace("$TASK", String.valueOf(taskId));
          return ret;
      }
  
      @Override
      public String getPath() {
          return path;
      }
  
      @SuppressWarnings("unchecked")
      @Override
      public void prepare(Map conf, TopologyContext topologyContext) {
          this.componentId = topologyContext.getThisComponentId();
          this.taskId = topologyContext.getThisTaskId();
          try {
              this.host = InetAddress.getLocalHost().getCanonicalHostName();
          } catch (UnknownHostException e) {
              throw new RuntimeException(e);
          }
      }
  
      public SimpleFileNameFormat withPath(String path) {
          this.path = path;
          return this;
      }
  
      /**
       * support parameters:<br/>
       * $TIME - current time. use <code>withTimeFormat</code> to format.<br/>
       * $NUM - rotation number<br/>
       * $HOST - local host name<br/>
       * $COMPONENT - component id<br/>
       * $TASK - task id<br/>
       * 
       * @param name
       *            file name
       * @return
       */
      public SimpleFileNameFormat withName(String name) {
          this.name = name;
          return this;
      }
  
      public SimpleFileNameFormat withTimeFormat(String timeFormat) {
          //check format
          try{
              new SimpleDateFormat(timeFormat);
          }catch (Exception e) {
              throw new IllegalArgumentException("invalid timeFormat: "+e.getMessage());
          }
          this.timeFormat = timeFormat;
          return this;
      }
  
  }
  