1 // ***************************************************************************
2 // bamtools_merge.cpp (c) 2010 Derek Barnett, Erik Garrison
3 // Marth Lab, Department of Biology, Boston College
4 // All rights reserved.
5 // ---------------------------------------------------------------------------
6 // Last modified: 7 April 2011
7 // ---------------------------------------------------------------------------
8 // Merges multiple BAM files into one
9 // ***************************************************************************
11 #include "bamtools_merge.h"
13 #include <api/BamMultiReader.h>
14 #include <api/BamWriter.h>
15 #include <utils/bamtools_options.h>
16 #include <utils/bamtools_utilities.h>
17 using namespace BamTools;
24 // ---------------------------------------------
25 // MergeSettings implementation
27 struct MergeTool::MergeSettings {
30 bool HasInputBamFilename;
31 bool HasOutputBamFilename;
32 bool IsForceCompression;
36 vector<string> InputFiles;
39 string OutputFilename;
44 : HasInputBamFilename(false)
45 , HasOutputBamFilename(false)
46 , IsForceCompression(false)
48 , OutputFilename(Options::StandardOut())
52 // ---------------------------------------------
53 // MergeToolPrivate implementation
55 struct MergeTool::MergeToolPrivate {
59 MergeToolPrivate(MergeTool::MergeSettings* settings)
60 : m_settings(settings)
63 ~MergeToolPrivate(void) { }
71 MergeTool::MergeSettings* m_settings;
74 bool MergeTool::MergeToolPrivate::Run(void) {
76 // set to default input if none provided
77 if ( !m_settings->HasInputBamFilename )
78 m_settings->InputFiles.push_back(Options::StandardIn());
80 // opens the BAM files (by default without checking for indexes)
81 BamMultiReader reader;
82 if ( !reader.Open(m_settings->InputFiles) ) {
83 cerr << "bamtools merge ERROR: could not open input BAM file(s)... Aborting." << endl;
87 // retrieve header & reference dictionary info
88 std::string mergedHeader = reader.GetHeaderText();
89 RefVector references = reader.GetReferenceData();
91 // determine compression mode for BamWriter
92 bool writeUncompressed = ( m_settings->OutputFilename == Options::StandardOut() &&
93 !m_settings->IsForceCompression );
94 BamWriter::CompressionMode compressionMode = BamWriter::Compressed;
95 if ( writeUncompressed ) compressionMode = BamWriter::Uncompressed;
99 writer.SetCompressionMode(compressionMode);
100 if ( !writer.Open(m_settings->OutputFilename, mergedHeader, references) ) {
101 cerr << "bamtools merge ERROR: could not open "
102 << m_settings->OutputFilename << " for writing." << endl;
107 // if no region specified, store entire contents of file(s)
108 if ( !m_settings->HasRegion ) {
110 while ( reader.GetNextAlignmentCore(al) )
111 writer.SaveAlignment(al);
114 // otherwise attempt to use region as constraint
117 // if region string parses OK
119 if ( Utilities::ParseRegionString(m_settings->Region, reader, region) ) {
121 // attempt to find index files
122 reader.LocateIndexes();
124 // if index data available for all BAM files, we can use SetRegion
125 if ( reader.HasIndexes() ) {
127 // attempt to use SetRegion(), if failed report error
128 if ( !reader.SetRegion(region.LeftRefID,
131 region.RightPosition) )
133 cerr << "bamtools merge ERROR: set region failed. Check that REGION describes a valid range"
139 // everything checks out, just iterate through specified region, storing alignments
141 while ( reader.GetNextAlignmentCore(al) )
142 writer.SaveAlignment(al);
145 // no index data available, we have to iterate through until we
146 // find overlapping alignments
149 while ( reader.GetNextAlignmentCore(al) ) {
150 if ( (al.RefID >= region.LeftRefID) && ( (al.Position + al.Length) >= region.LeftPosition ) &&
151 (al.RefID <= region.RightRefID) && ( al.Position <= region.RightPosition) )
153 writer.SaveAlignment(al);
159 // error parsing REGION string
161 cerr << "bamtools merge ERROR: could not parse REGION - " << m_settings->Region << endl;
162 cerr << "Check that REGION is in valid format (see documentation) and that the coordinates are valid"
176 // ---------------------------------------------
177 // MergeTool implementation
179 MergeTool::MergeTool(void)
181 , m_settings(new MergeSettings)
184 // set program details
185 Options::SetProgramInfo("bamtools merge", "merges multiple BAM files into one", "[-in <filename> -in <filename> ...] [-out <filename> | [-forceCompression]] [-region <REGION>]");
188 OptionGroup* IO_Opts = Options::CreateOptionGroup("Input & Output");
189 Options::AddValueOption("-in", "BAM filename", "the input BAM file(s)", "", m_settings->HasInputBamFilename, m_settings->InputFiles, IO_Opts);
190 Options::AddValueOption("-out", "BAM filename", "the output BAM file", "", m_settings->HasOutputBamFilename, m_settings->OutputFilename, IO_Opts);
191 Options::AddOption("-forceCompression", "if results are sent to stdout (like when piping to another tool), default behavior is to leave output uncompressed. Use this flag to override and force compression", m_settings->IsForceCompression, IO_Opts);
192 Options::AddValueOption("-region", "REGION", "genomic region. See README for more details", "", m_settings->HasRegion, m_settings->Region, IO_Opts);
195 MergeTool::~MergeTool(void) {
204 int MergeTool::Help(void) {
205 Options::DisplayHelp();
209 int MergeTool::Run(int argc, char* argv[]) {
211 // parse command line arguments
212 Options::Parse(argc, argv, 1);
214 // initialize MergeTool with settings
215 m_impl = new MergeToolPrivate(m_settings);
217 // run MergeTool, return success/fail