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 java.util.Iterator;
  
  import com.aliyun.odps.data.Record;
  import com.aliyun.odps.mapred.ReducerBase;
  
  /**
   * LongSumReducer
   *
   * @author mingdi
   */
  public class LongSumReducer extends ReducerBase {
  
    private Record result = null;
  
    @Override
    public void setup(TaskContext context) throws IOException {
      result = context.createOutputRecord();
    }
  
    @Override
    public void reduce(Record key, Iterator<Record> values, TaskContext context)
        throws IOException {
      long count = 0;
      while (values.hasNext()) {
        Record val = values.next();
        count += (Long) val.get(0);
      }
      result.set(0, key.get(0));
      result.set(1, count);
      context.write(result);
    }
  
  }
  
  /*
   * public class LongSumReducer<KEYIN> extends Reducer<KEYIN, LongWritable> {
   * private LongWritable sum = new LongWritable(); private Record result = null;
   * 
   * @Override protected void setup(ReduceContext<KEYIN, LongWritable> context)
   * throws IOException, InterruptedException { result =
   * context.createOutputRecord(); }
   * 
   * @Override public void reduce(KEYIN key, Iterable<LongWritable> values,
   * ReduceContext<KEYIN, LongWritable> context) throws IOException,
   * InterruptedException {
   * 
   * // sum all values for this key long count = 0; for (LongWritable lw : values)
   * { count += lw.get(); }
   * 
   * // output sum sum.set(count); result.set(0, (Writable) key); result.set(1,
   * sum); context.write(result); } }
   */
  