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.mode.pointwisemi.count;
031
032import java.io.IOException;
033
034import org.apache.hadoop.conf.Configurable;
035import org.apache.hadoop.conf.Configuration;
036import org.apache.hadoop.io.BytesWritable;
037import org.apache.hadoop.mapreduce.Partitioner;
038import org.apache.log4j.Logger;
039
040public class TokenPairPartitioner extends Partitioner<BytesWritable,BytesWritable> implements Configurable{
041
042
043        private Configuration conf;
044        private long timedelta;
045        Logger logger = Logger.getLogger(TokenPairPartitioner.class);
046
047        @Override
048        public int getPartition(BytesWritable key, BytesWritable value, int numPartitions) {
049                long time = -1;
050                try {
051                        time = TokenPairCount.timeFromBinaryIdentity(key.getBytes());
052                } catch (IOException e) {
053                        e.printStackTrace();
054                }
055                if(timedelta == -1) return (int) (time % numPartitions);
056                else return (int) ((time / timedelta) % numPartitions);
057        }
058
059        @Override
060        public void setConf(Configuration conf) {
061                this.conf = conf;
062                this.timedelta = conf.getLong(PairMutualInformation.TIMEDELTA,-1);
063        }
064
065        @Override
066        public Configuration getConf() {
067                return conf;
068        }
069
070}