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.local.lib;
  
  import java.io.IOException;
  
  import com.aliyun.odps.data.Record;
  import com.aliyun.odps.mapred.Mapper;
  import com.aliyun.odps.mapred.MapperBase;
  
  /**
   * A {@link Mapper} that swaps keys and values.
   *
   * @author mingdi
   */
  public class InverseMapper extends MapperBase {
  
    private Record word;
    private Record count;
  
    @Override
    public void setup(TaskContext context) throws IOException {
      word = context.createMapOutputValueRecord();
      count = context.createMapOutputKeyRecord();
    }
  
    /**
     * The inverse function. Input keys and values are swapped.
     */
    @Override
    public void map(long recordNum, Record record, TaskContext context)
        throws IOException {
      word.set(new Object[]{record.get(0).toString()});
      count.set(new Object[]{record.get(1)});
      context.write(count, word);
    }
  
  }
  
  // public class InverseMapper extends Mapper<LongWritable, Text> {
  //
  // /** The inverse function. Input keys and values are swapped. */
  // public void map(LongWritable key, Record value,
  // MapContext<LongWritable, Text> context) throws IOException,
  // InterruptedException {
  // context.write((LongWritable) value.get(1), (Text) value.get(0));
  // }
  // }
  