93 lines
3.1 KiB
Java
93 lines
3.1 KiB
Java
package org.broadinstitute.sting.alignment;
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import org.broadinstitute.sting.gatk.walkers.ReadWalker;
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import org.broadinstitute.sting.alignment.bwa.BWTFiles;
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import org.broadinstitute.sting.alignment.bwa.BWAConfiguration;
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import org.broadinstitute.sting.alignment.bwa.c.BWACAligner;
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import org.broadinstitute.sting.utils.cmdLine.Argument;
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import net.sf.samtools.SAMRecord;
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import java.util.*;
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/**
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* Counts the number of best alignments
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*
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* @author mhanna
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* @version 0.1
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*/
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public class CountBestAlignmentsWalker extends ReadWalker<Integer,Integer> {
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/**
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* The supporting BWT index generated using BWT.
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*/
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@Argument(fullName="BWTPrefix",shortName="BWT",doc="Index files generated by bwa index -d bwtsw",required=false)
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private String prefix = null;
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/**
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* The actual aligner.
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*/
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private Aligner aligner = null;
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private SortedMap<Integer,Integer> alignmentFrequencies = new TreeMap<Integer,Integer>();
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/**
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* Create an aligner object. The aligner object will load and hold the BWT until close() is called.
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*/
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@Override
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public void initialize() {
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if(prefix == null)
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prefix = getToolkit().getArguments().referenceFile.getAbsolutePath();
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BWTFiles bwtFiles = new BWTFiles(prefix);
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BWAConfiguration configuration = new BWAConfiguration();
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aligner = new BWACAligner(bwtFiles,configuration);
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}
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/**
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* Aligns a read to the given reference.
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* @param ref Reference over the read. Read will most likely be unmapped, so ref will be null.
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* @param read Read to align.
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* @return Number of alignments found for this read.
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*/
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@Override
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public Integer map(char[] ref, SAMRecord read) {
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Iterator<Alignment[]> alignmentIterator = aligner.getAllAlignments(read.getReadBases()).iterator();
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if(alignmentIterator.hasNext()) {
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int numAlignments = alignmentIterator.next().length;
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if(alignmentFrequencies.containsKey(numAlignments))
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alignmentFrequencies.put(numAlignments,alignmentFrequencies.get(numAlignments)+1);
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else
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alignmentFrequencies.put(numAlignments,1);
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}
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return 1;
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}
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/**
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* Initial value for reduce. In this case, validated reads will be counted.
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* @return 0, indicating no reads yet validated.
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*/
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@Override
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public Integer reduceInit() { return 0; }
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/**
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* Calculates the number of reads processed.
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* @param value Number of reads processed by this map.
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* @param sum Number of reads processed before this map.
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* @return Number of reads processed up to and including this map.
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*/
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@Override
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public Integer reduce(Integer value, Integer sum) {
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return value + sum;
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}
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/**
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* Cleanup.
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* @param result Number of reads processed.
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*/
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@Override
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public void onTraversalDone(Integer result) {
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aligner.close();
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for(Map.Entry<Integer,Integer> alignmentFrequency: alignmentFrequencies.entrySet())
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out.printf("%d\t%d%n", alignmentFrequency.getKey(), alignmentFrequency.getValue());
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super.onTraversalDone(result);
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}
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}
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