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.aliyun.odps.mapred;
  
  import java.io.IOException;
  
  import com.aliyun.odps.data.Record;
  
  /**
   * Mapper 的空实现，详情请参见 {@link Mapper}
   */
  public class MapperBase implements Mapper {
  
    @Override
    public void setup(TaskContext context) throws IOException {
    }
  
    @Override
    public void map(long key, Record record, TaskContext context)
        throws IOException {
  
    }
  
    @Override
    public void cleanup(TaskContext context) throws IOException {
  
    }
  
    public void run(TaskContext context) throws IOException {
      setup(context);
      while (context.nextRecord()) {
        map(context.getCurrentRecordNum(), context.getCurrentRecord(), context);
      }
      cleanup(context);
    }
  
    /**
     * @Deprecated Use {@link #setup(com.aliyun.odps.mapred.Mapper.TaskContext)} instead.
     */
    @Deprecated
    public void setup(com.aliyun.odps.mapred.TaskContext context) throws IOException {
    }
  
    /**
     * @Deprecated Use {@link #map(long, Record, com.aliyun.odps.mapred.Mapper.TaskContext)} instead.
     */
    @Deprecated
    public void map(long key, Record record, com.aliyun.odps.mapred.TaskContext context)
        throws IOException {
  
    }
  
    /**
     * @Deprecated Use {@link #cleanup(com.aliyun.odps.mapred.Mapper.TaskContext)} instead.
     */
    @Deprecated
    public void cleanup(com.aliyun.odps.mapred.TaskContext context) throws IOException {
  
    }
  
  }
  