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.correlation; 031 032import java.io.IOException; 033import java.io.StringReader; 034 035import org.apache.hadoop.io.DoubleWritable; 036import org.apache.hadoop.io.LongWritable; 037import org.apache.hadoop.io.Text; 038import org.apache.hadoop.mapreduce.Mapper; 039 040import com.Ostermiller.util.CSVParser; 041 042public class PValueWordMapper extends Mapper<LongWritable, Text, DoubleWritable, Text> { 043 private static double maxp = -1; 044 public PValueWordMapper(){ 045 046 } 047 048 @Override 049 public void setup(Mapper<LongWritable,Text,DoubleWritable,Text>.Context context) throws IOException ,InterruptedException { 050 load(context); 051 }; 052 private static void load(Mapper<LongWritable,Text,DoubleWritable,Text>.Context context) { 053 maxp = context.getConfiguration().getFloat(CorrelateWordSort.MAXP_KEY, -1); 054 } 055 056 @Override 057 public void map(LongWritable key, Text value, Mapper<LongWritable,Text,DoubleWritable,Text>.Context context) throws IOException ,InterruptedException { 058 CSVParser csvp = new CSVParser(new StringReader(value.toString())); 059 String[] linevals = csvp.getLine(); 060 double pvalue = Double.parseDouble(linevals[3]); 061 if(new Double(pvalue).equals(Double.NaN)) return; 062 if(maxp == -1 || pvalue < maxp){ 063 context.write(new DoubleWritable(pvalue), value); 064 } 065 }; 066}