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.jacard;
031
032import org.apache.hadoop.io.BytesWritable;
033import org.apache.hadoop.io.LongWritable;
034import org.apache.hadoop.io.NullWritable;
035import org.apache.hadoop.io.Text;
036import org.apache.hadoop.mapreduce.Job;
037import org.apache.hadoop.mapreduce.Mapper;
038import org.apache.hadoop.mapreduce.Reducer;
039import org.openimaj.hadoop.mapreduce.stage.helper.SequenceFileTextStage;
040
041/**
042 * Count word instances (not occurences) across times. Allows for investigation of how
043 * the vocabulary has changed over time.
044 * 
045 * @author Sina Samangooei (ss@ecs.soton.ac.uk)
046 *
047 */
048public class TimeWordJacardIndex extends SequenceFileTextStage<Text, BytesWritable, LongWritable, Text, NullWritable, Text>{
049        @Override
050        public void setup(Job job) {
051                job.setNumReduceTasks(1);
052        }
053        @Override
054        public Class<? extends Mapper<Text, BytesWritable, LongWritable, Text>> mapper() {
055                return TimeWordMapper.class;
056        }
057        
058        @Override
059        public Class<? extends Reducer<LongWritable, Text, NullWritable, Text>> reducer() {
060                return CumulativeJacardReducer.class;
061        }
062        @Override
063        public String outname() {
064                return "jacardindex";
065        }
066}