001/**
002 * Copyright (c) 2011, The University of Southampton and the individual contributors.
003 * All rights reserved.
004 *
005 * Redistribution and use in source and binary forms, with or without modification,
006 * are permitted provided that the following conditions are met:
007 *
008 *   *  Redistributions of source code must retain the above copyright notice,
009 *      this list of conditions and the following disclaimer.
010 *
011 *   *  Redistributions in binary form must reproduce the above copyright notice,
012 *      this list of conditions and the following disclaimer in the documentation
013 *      and/or other materials provided with the distribution.
014 *
015 *   *  Neither the name of the University of Southampton nor the names of its
016 *      contributors may be used to endorse or promote products derived from this
017 *      software without specific prior written permission.
018 *
019 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
020 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
021 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
022 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
023 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
024 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
025 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
026 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
027 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
028 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
029 */
030package org.openimaj.hadoop.tools.twitter.token.outputmode.sparsecsv;
031
032import org.apache.hadoop.io.NullWritable;
033import org.apache.hadoop.io.Text;
034import org.apache.hadoop.mapreduce.Reducer;
035
036/**
037 * Writes each word,count
038 * @author Sina Samangooei (ss@ecs.soton.ac.uk)
039 *
040 */
041public class ReduceValuesByWord extends Reducer<NullWritable,Text,NullWritable,Text>{
042        /**
043         * construct the reduce instance, do nothing
044         */
045        public ReduceValuesByWord() {
046                // TODO Auto-generated constructor stub
047        }
048        @Override
049        public void reduce(NullWritable timeslot, Iterable<Text> manylines, Reducer<NullWritable,Text,NullWritable,Text>.Context context){
050                try {
051                        for (Text lines : manylines) {
052                                context.write(NullWritable.get(), new Text(lines.toString() ));
053                        }
054                        
055                } catch (Exception e) {
056                        System.err.println("Couldn't reduce to final file");
057                }
058        }
059}