1 // ***************************************************************************
2 // bamtools_merge.cpp (c) 2010 Derek Barnett, Erik Garrison
3 // Marth Lab, Department of Biology, Boston College
4 // ---------------------------------------------------------------------------
5 // Last modified: 7 April 2011
6 // ---------------------------------------------------------------------------
7 // Merges multiple BAM files into one
8 // ***************************************************************************
10 #include "bamtools_merge.h"
12 #include <api/BamMultiReader.h>
13 #include <api/BamWriter.h>
14 #include <utils/bamtools_options.h>
15 #include <utils/bamtools_utilities.h>
16 using namespace BamTools;
23 // ---------------------------------------------
24 // MergeSettings implementation
26 struct MergeTool::MergeSettings {
29 bool HasInputBamFilename;
30 bool HasInputBamFilelist;
31 bool HasOutputBamFilename;
32 bool IsForceCompression;
36 vector<string> InputFiles;
40 string OutputFilename;
45 : HasInputBamFilename(false)
46 , HasInputBamFilelist(false)
47 , HasOutputBamFilename(false)
48 , IsForceCompression(false)
50 , OutputFilename(Options::StandardOut())
54 // ---------------------------------------------
55 // MergeToolPrivate implementation
57 struct MergeTool::MergeToolPrivate {
61 MergeToolPrivate(MergeTool::MergeSettings* settings)
62 : m_settings(settings)
65 ~MergeToolPrivate(void) { }
73 MergeTool::MergeSettings* m_settings;
76 bool MergeTool::MergeToolPrivate::Run(void) {
78 // set to default input if none provided
79 if ( !m_settings->HasInputBamFilename && !m_settings->HasInputBamFilelist )
80 m_settings->InputFiles.push_back(Options::StandardIn());
82 // add files in the filelist to the input file list
83 if ( m_settings->HasInputBamFilelist ) {
84 ifstream filelist(m_settings->InputFilelist.c_str(), ios::in);
85 if ( !filelist.is_open() ) {
86 cerr << "bamtools merge ERROR: could not open input BAM file list... Aborting." << endl;
90 while ( getline(filelist, line) ) {
91 m_settings->InputFiles.push_back(line);
95 // opens the BAM files (by default without checking for indexes)
96 BamMultiReader reader;
97 if ( !reader.Open(m_settings->InputFiles) ) {
98 cerr << "bamtools merge ERROR: could not open input BAM file(s)... Aborting." << endl;
102 // retrieve header & reference dictionary info
103 std::string mergedHeader = reader.GetHeaderText();
104 RefVector references = reader.GetReferenceData();
106 // determine compression mode for BamWriter
107 bool writeUncompressed = ( m_settings->OutputFilename == Options::StandardOut() &&
108 !m_settings->IsForceCompression );
109 BamWriter::CompressionMode compressionMode = BamWriter::Compressed;
110 if ( writeUncompressed ) compressionMode = BamWriter::Uncompressed;
114 writer.SetCompressionMode(compressionMode);
115 if ( !writer.Open(m_settings->OutputFilename, mergedHeader, references) ) {
116 cerr << "bamtools merge ERROR: could not open "
117 << m_settings->OutputFilename << " for writing." << endl;
122 // if no region specified, store entire contents of file(s)
123 if ( !m_settings->HasRegion ) {
125 while ( reader.GetNextAlignmentCore(al) )
126 writer.SaveAlignment(al);
129 // otherwise attempt to use region as constraint
132 // if region string parses OK
134 if ( Utilities::ParseRegionString(m_settings->Region, reader, region) ) {
136 // attempt to find index files
137 reader.LocateIndexes();
139 // if index data available for all BAM files, we can use SetRegion
140 if ( reader.HasIndexes() ) {
142 // attempt to use SetRegion(), if failed report error
143 if ( !reader.SetRegion(region.LeftRefID,
146 region.RightPosition) )
148 cerr << "bamtools merge ERROR: set region failed. Check that REGION describes a valid range"
154 // everything checks out, just iterate through specified region, storing alignments
156 while ( reader.GetNextAlignmentCore(al) )
157 writer.SaveAlignment(al);
160 // no index data available, we have to iterate through until we
161 // find overlapping alignments
164 while ( reader.GetNextAlignmentCore(al) ) {
165 if ( (al.RefID >= region.LeftRefID) && ( (al.Position + al.Length) >= region.LeftPosition ) &&
166 (al.RefID <= region.RightRefID) && ( al.Position <= region.RightPosition) )
168 writer.SaveAlignment(al);
174 // error parsing REGION string
176 cerr << "bamtools merge ERROR: could not parse REGION - " << m_settings->Region << endl;
177 cerr << "Check that REGION is in valid format (see documentation) and that the coordinates are valid"
191 // ---------------------------------------------
192 // MergeTool implementation
194 MergeTool::MergeTool(void)
196 , m_settings(new MergeSettings)
199 // set program details
200 Options::SetProgramInfo("bamtools merge", "merges multiple BAM files into one", "[ [-in <filename> -in <filename> ...] | [-list <filelist>] ] [-out <filename> | [-forceCompression]] [-region <REGION>]");
203 OptionGroup* IO_Opts = Options::CreateOptionGroup("Input & Output");
204 Options::AddValueOption("-in", "BAM filename", "the input BAM file(s)", "", m_settings->HasInputBamFilename, m_settings->InputFiles, IO_Opts);
205 Options::AddValueOption("-list", "BAM filename", "the input BAM file list, one line per file", "", m_settings->HasInputBamFilelist, m_settings->InputFilelist, IO_Opts);
206 Options::AddValueOption("-out", "BAM filename", "the output BAM file", "", m_settings->HasOutputBamFilename, m_settings->OutputFilename, IO_Opts);
207 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);
208 Options::AddValueOption("-region", "REGION", "genomic region. See README for more details", "", m_settings->HasRegion, m_settings->Region, IO_Opts);
211 MergeTool::~MergeTool(void) {
220 int MergeTool::Help(void) {
221 Options::DisplayHelp();
225 int MergeTool::Run(int argc, char* argv[]) {
227 // parse command line arguments
228 Options::Parse(argc, argv, 1);
230 // initialize MergeTool with settings
231 m_impl = new MergeToolPrivate(m_settings);
233 // run MergeTool, return success/fail