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;
031
032import java.io.IOException;
033import java.io.PrintWriter;
034import java.io.StringWriter;
035import java.util.List;
036
037import org.apache.hadoop.io.LongWritable;
038import org.apache.hadoop.io.Text;
039import org.apache.hadoop.mapreduce.Mapper;
040import org.joda.time.DateTime;
041import org.kohsuke.args4j.CmdLineException;
042import org.openimaj.tools.twitter.modes.preprocessing.TwitterPreprocessingMode;
043import org.openimaj.tools.twitter.options.AbstractTwitterPreprocessingToolOptions;
044import org.openimaj.twitter.GeneralJSONTwitter;
045import org.openimaj.twitter.USMFStatus;
046
047/**
048 * This mapper loads arguments for the {@link AbstractTwitterPreprocessingToolOptions} from the {@link HadoopTwitterPreprocessingTool#ARGS_KEY}
049 * variable (once per in memory mapper) and uses these to preprocess tweets.
050 * @author Sina Samangooei (ss@ecs.soton.ac.uk)
051 *
052 */
053public class DateTwitterPreprocessingMapper extends Mapper<LongWritable, Text, LongWritable, Text> {
054        private static HadoopTwitterPreprocessingToolOptions options = null;
055        private static List<TwitterPreprocessingMode<?>> modes = null;
056
057        protected static synchronized void loadOptions(Mapper<LongWritable, Text, LongWritable, Text>.Context context) throws IOException {
058                if (options == null) {
059                        try {
060                                options = new HadoopTwitterPreprocessingToolOptions(context.getConfiguration().getStrings(HadoopTwitterPreprocessingTool.ARGS_KEY));
061                                options.prepare();
062                                modes = options.preprocessingMode();
063                        } catch (CmdLineException e) {
064                                throw new IOException(e);
065                        } catch (Exception e) {
066                                throw new IOException(e);
067                        }
068                }
069        }
070
071        @Override
072        protected void setup(Mapper<LongWritable, Text, LongWritable, Text>.Context context)throws IOException, InterruptedException{
073                loadOptions(context);
074        }
075
076        @Override
077        protected void map(LongWritable key, Text value, Mapper<LongWritable, Text, LongWritable, Text>.Context context) throws java.io.IOException, InterruptedException
078        {
079                USMFStatus status = new USMFStatus(GeneralJSONTwitter.class);
080                status.fillFromString(value.toString());
081                if(status.isInvalid()) return;
082                for (TwitterPreprocessingMode<?> mode : modes) {
083                        mode.process(status);
084                }
085                StringWriter outTweetString = new StringWriter();
086                PrintWriter outTweetWriter = new PrintWriter(outTweetString);
087                try {
088                        options.ouputMode().output(options.convertToOutputFormat(status), outTweetWriter );
089                        DateTime date = status.createdAt();
090                        if(date == null) return;
091                        DateTime dayDate = new DateTime(date.getYear(), date.getMonthOfYear(), date.getDayOfMonth(),0,0);
092
093                        context.write(new LongWritable(dayDate.getMillis()), new Text(outTweetString.getBuffer().toString()));
094                } catch (Exception e) {
095                        System.err.println("Failed to write tweet: " + status.text);
096                        System.err.println("With error: ");
097                        e.printStackTrace();
098                }
099        }
100}