1 // ***************************************************************************
2 // BamMultiReader_p.cpp (c) 2010 Derek Barnett, Erik Garrison
3 // Marth Lab, Department of Biology, Boston College
4 // All rights reserved.
5 // ---------------------------------------------------------------------------
6 // Last modified: 21 March 2011 (DB)
7 // ---------------------------------------------------------------------------
8 // Functionality for simultaneously reading multiple BAM files
9 // *************************************************************************
11 #include <api/BamAlignment.h>
12 #include <api/BamMultiReader.h>
13 #include <api/internal/BamMultiMerger_p.h>
14 #include <api/internal/BamMultiReader_p.h>
15 using namespace BamTools;
16 using namespace BamTools::Internal;
26 BamMultiReaderPrivate::BamMultiReaderPrivate(void)
29 , m_sortOrder(BamMultiReader::SortedByPosition)
33 BamMultiReaderPrivate::~BamMultiReaderPrivate(void) {
35 // close all open BAM readers
38 // clean up alignment cache
43 // close all BAM files
44 void BamMultiReaderPrivate::Close(void) {
45 CloseFiles( Filenames() );
48 // close requested BAM file
49 void BamMultiReaderPrivate::CloseFile(const string& filename) {
50 vector<string> filenames(1, filename);
51 CloseFiles(filenames);
54 // close requested BAM files
55 void BamMultiReaderPrivate::CloseFiles(const vector<string>& filenames) {
57 // iterate over filenames
58 vector<string>::const_iterator filesIter = filenames.begin();
59 vector<string>::const_iterator filesEnd = filenames.end();
60 for ( ; filesIter != filesEnd; ++filesIter ) {
61 const string& filename = (*filesIter);
62 if ( filename.empty() ) continue;
64 // iterate over readers
65 vector<ReaderAlignment>::iterator readerIter = m_readers.begin();
66 vector<ReaderAlignment>::iterator readerEnd = m_readers.end();
67 for ( ; readerIter != readerEnd; ++readerIter ) {
68 BamReader* reader = (*readerIter).first;
69 if ( reader == 0 ) continue;
71 // if reader matches requested filename
72 if ( reader->GetFilename() == filename ) {
74 // remove reader/alignment from alignment cache
75 m_alignments->Remove(reader);
77 // close & delete reader
82 // delete reader's alignment entry
83 BamAlignment* alignment = (*readerIter).second;
87 // remove reader from container
88 m_readers.erase(readerIter);
90 // on match, just go on to next filename
91 // (no need to keep looking and iterator is invalid now anyway)
97 // make sure alignment cache is cleared if all readers are now closed
98 if ( m_readers.empty() && m_alignments != 0 )
99 m_alignments->Clear();
102 // creates index files for BAM files that don't have them
103 bool BamMultiReaderPrivate::CreateIndexes(const BamIndex::IndexType& type) {
107 // iterate over readers
108 vector<ReaderAlignment>::iterator readerIter = m_readers.begin();
109 vector<ReaderAlignment>::iterator readerEnd = m_readers.end();
110 for ( ; readerIter != readerEnd; ++readerIter ) {
111 BamReader* reader = (*readerIter).first;
112 if ( reader == 0 ) continue;
114 // if reader doesn't have an index, create one
115 if ( !reader->HasIndex() )
116 result &= reader->CreateIndex(type);
122 IBamMultiMerger* BamMultiReaderPrivate::CreateMergerForCurrentSortOrder(void) const {
123 switch ( m_sortOrder ) {
124 case ( BamMultiReader::SortedByPosition ) : return new PositionMultiMerger;
125 case ( BamMultiReader::SortedByReadName ) : return new ReadNameMultiMerger;
126 case ( BamMultiReader::Unsorted ) : return new UnsortedMultiMerger;
128 cerr << "BamMultiReader ERROR: requested sort order is unknown" << endl;
133 const string BamMultiReaderPrivate::ExtractReadGroup(const string& headerLine) const {
135 string readGroup("");
136 stringstream headerLineSs(headerLine);
139 // parse @RG header line, looking for the ID: tag
140 while( getline(headerLineSs, part, '\t') ) {
141 stringstream partSs(part);
143 getline(partSs, subtag, ':');
144 if ( subtag == "ID" ) {
145 getline(partSs, readGroup, ':');
152 const vector<string> BamMultiReaderPrivate::Filenames(void) const {
154 // init filename container
155 vector<string> filenames;
156 filenames.reserve( m_readers.size() );
158 // iterate over readers
159 vector<ReaderAlignment>::const_iterator readerIter = m_readers.begin();
160 vector<ReaderAlignment>::const_iterator readerEnd = m_readers.end();
161 for ( ; readerIter != readerEnd; ++readerIter ) {
162 const BamReader* reader = (*readerIter).first;
163 if ( reader == 0 ) continue;
165 // store filename if not empty
166 const string filename = reader->GetFilename();
167 if ( !filename.empty() )
168 filenames.push_back( reader->GetFilename() );
175 SamHeader BamMultiReaderPrivate::GetHeader(void) const {
176 string text = GetHeaderText();
177 return SamHeader(text);
180 // makes a virtual, unified header for all the bam files in the multireader
181 string BamMultiReaderPrivate::GetHeaderText(void) const {
183 // if only one reader is open
184 if ( m_readers.size() == 1 ) {
186 // just return reader's header text
187 const ReaderAlignment& ra = m_readers.front();
188 const BamReader* reader = ra.first;
189 if ( reader ) return reader->GetHeaderText();
195 string mergedHeader("");
196 map<string, bool> readGroups;
198 // foreach extraction entry (each BAM file)
199 vector<ReaderAlignment>::const_iterator readerBegin = m_readers.begin();
200 vector<ReaderAlignment>::const_iterator readerIter = readerBegin;
201 vector<ReaderAlignment>::const_iterator readerEnd = m_readers.end();
202 for ( ; readerIter != readerEnd; ++readerIter ) {
203 const BamReader* reader = (*readerIter).first;
204 if ( reader == 0 ) continue;
206 // get header from reader
207 string headerText = reader->GetHeaderText();
208 if ( headerText.empty() ) continue;
210 // store header text in lines
211 map<string, bool> currentFileReadGroups;
212 const vector<string> lines = SplitHeaderText(headerText);
214 // iterate over header lines
215 vector<string>::const_iterator linesIter = lines.begin();
216 vector<string>::const_iterator linesEnd = lines.end();
217 for ( ; linesIter != linesEnd; ++linesIter ) {
219 // get next line from header, skip if empty
220 const string headerLine = (*linesIter);
221 if ( headerLine.empty() ) continue;
223 // if first file, save HD & SQ entries
224 // TODO: what if first file has empty header, should just check for empty 'mergedHeader' instead ?
225 if ( readerIter == readerBegin ) {
226 if ( headerLine.find("@HD") == 0 || headerLine.find("@SQ") == 0) {
227 mergedHeader.append(headerLine.c_str());
228 mergedHeader.append(1, '\n');
232 // (for all files) append RG entries if they are unique
233 if ( headerLine.find("@RG") == 0 ) {
235 // extract read group name from line
236 const string readGroup = ExtractReadGroup(headerLine);
238 // make sure not to duplicate @RG entries
239 if ( readGroups.find(readGroup) == readGroups.end() ) {
240 mergedHeader.append(headerLine.c_str() );
241 mergedHeader.append(1, '\n');
242 readGroups[readGroup] = true;
243 currentFileReadGroups[readGroup] = true;
245 // warn iff we are reading one file and discover duplicated @RG tags in the header
246 // otherwise, we emit no warning, as we might be merging multiple BAM files with identical @RG tags
247 if ( currentFileReadGroups.find(readGroup) != currentFileReadGroups.end() ) {
248 cerr << "BamMultiReader WARNING: duplicate @RG tag " << readGroup
249 << " entry in header of " << reader->GetFilename() << endl;
256 // return merged header text
260 // get next alignment among all files
261 bool BamMultiReaderPrivate::GetNextAlignment(BamAlignment& al) {
262 m_isCoreMode = false;
263 return LoadNextAlignment(al);
266 // get next alignment among all files without parsing character data from alignments
267 bool BamMultiReaderPrivate::GetNextAlignmentCore(BamAlignment& al) {
269 return LoadNextAlignment(al);
272 // ---------------------------------------------------------------------------------------
274 // NB: The following GetReferenceX() functions assume that we have identical
275 // references for all BAM files. We enforce this by invoking the
276 // ValidateReaders() method to verify that our reference data is the same
277 // across all files on Open - so we will not encounter a situation in which
278 // there is a mismatch and we are still live.
280 // ---------------------------------------------------------------------------------------
282 // returns the number of reference sequences
283 int BamMultiReaderPrivate::GetReferenceCount(void) const {
285 // handle empty multireader
286 if ( m_readers.empty() )
289 // return reference count from first reader
290 const ReaderAlignment& ra = m_readers.front();
291 const BamReader* reader = ra.first;
292 if ( reader ) return reader->GetReferenceCount();
298 // returns vector of reference objects
299 const RefVector BamMultiReaderPrivate::GetReferenceData(void) const {
301 // handle empty multireader
302 if ( m_readers.empty() )
305 // return reference data from first BamReader
306 const ReaderAlignment& ra = m_readers.front();
307 const BamReader* reader = ra.first;
308 if ( reader ) return reader->GetReferenceData();
314 // returns refID from reference name
315 int BamMultiReaderPrivate::GetReferenceID(const string& refName) const {
317 // handle empty multireader
318 if ( m_readers.empty() )
321 // return reference ID from first BamReader
322 const ReaderAlignment& ra = m_readers.front();
323 const BamReader* reader = ra.first;
324 if ( reader ) return reader->GetReferenceID(refName);
329 // ---------------------------------------------------------------------------------------
331 // checks if any readers still have alignments
332 bool BamMultiReaderPrivate::HasAlignmentData(void) const {
333 if ( m_alignments == 0 )
335 return !m_alignments->IsEmpty();
338 // returns true if all readers have index data available
339 // this is useful to indicate whether Jump() or SetRegion() are possible
340 bool BamMultiReaderPrivate::HasIndexes(void) const {
342 // handle empty multireader
343 if ( m_readers.empty() )
348 // iterate over readers
349 vector<ReaderAlignment>::const_iterator readerIter = m_readers.begin();
350 vector<ReaderAlignment>::const_iterator readerEnd = m_readers.end();
351 for ( ; readerIter != readerEnd; ++readerIter ) {
352 const BamReader* reader = (*readerIter).first;
353 if ( reader == 0 ) continue;
355 // see if current reader has index data
356 result &= reader->HasIndex();
362 // returns true if multireader has open readers
363 bool BamMultiReaderPrivate::HasOpenReaders(void) {
365 // iterate over readers
366 vector<ReaderAlignment>::const_iterator readerIter = m_readers.begin();
367 vector<ReaderAlignment>::const_iterator readerEnd = m_readers.end();
368 for ( ; readerIter != readerEnd; ++readerIter ) {
369 const BamReader* reader = (*readerIter).first;
370 if ( reader == 0 ) continue;
372 // return true whenever an open reader is found
373 if ( reader->IsOpen() ) return true;
380 // performs random-access jump using (refID, position) as a left-bound
381 bool BamMultiReaderPrivate::Jump(int refID, int position) {
383 // NB: While it may make sense to track readers in which we can
384 // successfully Jump, in practice a failure of Jump means "no
385 // alignments here." It makes sense to simply accept the failure,
386 // UpdateAlignments(), and continue.
388 // iterate over readers
389 vector<ReaderAlignment>::iterator readerIter = m_readers.begin();
390 vector<ReaderAlignment>::iterator readerEnd = m_readers.end();
391 for ( ; readerIter != readerEnd; ++readerIter ) {
392 BamReader* reader = (*readerIter).first;
393 if ( reader == 0 ) continue;
395 // attempt jump() on each
396 if ( !reader->Jump(refID, position) ) {
397 cerr << "BamMultiReader ERROR: could not jump " << reader->GetFilename()
398 << " to " << refID << ":" << position << endl;
402 // update alignment cache & return success
403 UpdateAlignmentCache();
407 bool BamMultiReaderPrivate::LoadNextAlignment(BamAlignment& al) {
409 // bail out if no more data to process
410 if ( !HasAlignmentData() )
413 // "pop" next alignment and reader
414 ReaderAlignment nextReaderAlignment = m_alignments->TakeFirst();
415 BamReader* reader = nextReaderAlignment.first;
416 BamAlignment* alignment = nextReaderAlignment.second;
418 // store cached alignment into destination parameter (by copy)
421 // peek to next alignment & store in cache
422 SaveNextAlignment(reader, alignment);
428 // locate (& load) index files for BAM readers that don't already have one loaded
429 bool BamMultiReaderPrivate::LocateIndexes(const BamIndex::IndexType& preferredType) {
433 // iterate over readers
434 vector<ReaderAlignment>::iterator readerIter = m_readers.begin();
435 vector<ReaderAlignment>::iterator readerEnd = m_readers.end();
436 for ( ; readerIter != readerEnd; ++readerIter ) {
437 BamReader* reader = (*readerIter).first;
438 if ( reader == 0 ) continue;
440 // if reader has no index, try to locate one
441 if ( !reader->HasIndex() )
442 result &= reader->LocateIndex(preferredType);
449 bool BamMultiReaderPrivate::Open(const vector<string>& filenames) {
451 // create alignment cache if neccessary
452 if ( m_alignments == 0 ) {
453 m_alignments = CreateMergerForCurrentSortOrder();
454 if ( m_alignments == 0 ) return false;
457 // iterate over filenames
458 vector<string>::const_iterator filenameIter = filenames.begin();
459 vector<string>::const_iterator filenameEnd = filenames.end();
460 for ( ; filenameIter != filenameEnd; ++filenameIter ) {
461 const string& filename = (*filenameIter);
462 if ( filename.empty() ) continue;
464 // attempt to open BamReader on filename
465 BamReader* reader = OpenReader(filename);
466 if ( reader == 0 ) continue;
468 // store reader with new alignment
469 m_readers.push_back( make_pair(reader, new BamAlignment) );
472 // validate & rewind any opened readers, also refreshes alignment cache
473 if ( !m_readers.empty() ) {
482 bool BamMultiReaderPrivate::OpenFile(const std::string& filename) {
483 vector<string> filenames(1, filename);
484 return Open(filenames);
487 bool BamMultiReaderPrivate::OpenIndexes(const vector<string>& indexFilenames) {
489 // TODO: This needs to be cleaner - should not assume same order.
490 // And either way, shouldn't start at first reader. Should start at
491 // first reader without an index?
493 // make sure same number of index filenames as readers
494 if ( m_readers.size() != indexFilenames.size() || !indexFilenames.empty() )
500 // iterate over BamReaders
501 vector<string>::const_iterator indexFilenameIter = indexFilenames.begin();
502 vector<string>::const_iterator indexFilenameEnd = indexFilenames.end();
503 vector<ReaderAlignment>::iterator readerIter = m_readers.begin();
504 vector<ReaderAlignment>::iterator readerEnd = m_readers.end();
505 for ( ; readerIter != readerEnd; ++readerIter ) {
506 BamReader* reader = (*readerIter).first;
508 // open index filename on reader
510 const string& indexFilename = (*indexFilenameIter);
511 result &= reader->OpenIndex(indexFilename);
514 // increment filename iterator, skip if no more index files to open
515 if ( ++indexFilenameIter == indexFilenameEnd )
519 // TODO: validation ??
521 // return success/fail
525 BamReader* BamMultiReaderPrivate::OpenReader(const std::string& filename) {
527 // create new BamReader
528 BamReader* reader = new BamReader;
530 // if reader opens OK
531 if ( reader->Open(filename) ) {
533 // attempt to read first alignment (sanity check)
534 // if ok, then return BamReader pointer
536 if ( reader->GetNextAlignmentCore(al) )
539 // could not read alignment
541 cerr << "BamMultiReader WARNING: Could not read first alignment from "
542 << filename << ", ignoring file" << endl;
546 // reader could not open
548 cerr << "BamMultiReader WARNING: Could not open: "
549 << filename << ", ignoring file" << endl;
552 // if we get here, there was a problem with this BAM file (opening or reading)
553 // clean up memory allocation & return null pointer
558 // print associated filenames to stdout
559 void BamMultiReaderPrivate::PrintFilenames(void) const {
560 const vector<string>& filenames = Filenames();
561 vector<string>::const_iterator filenameIter = filenames.begin();
562 vector<string>::const_iterator filenameEnd = filenames.end();
563 for ( ; filenameIter != filenameEnd; ++filenameIter )
564 cout << (*filenameIter) << endl;
567 // returns BAM file pointers to beginning of alignment data & resets alignment cache
568 bool BamMultiReaderPrivate::Rewind(void) {
570 // clear out alignment cache
571 m_alignments->Clear();
573 // attempt to rewind files
574 if ( !RewindReaders() ) {
575 cerr << "BamMultiReader ERROR: could not rewind file(s) successfully";
579 // reset cache & return success
580 UpdateAlignmentCache();
584 // returns BAM file pointers to beginning of alignment data
585 bool BamMultiReaderPrivate::RewindReaders(void) {
589 // iterate over readers
590 vector<ReaderAlignment>::iterator readerIter = m_readers.begin();
591 vector<ReaderAlignment>::iterator readerEnd = m_readers.end();
592 for ( ; readerIter != readerEnd; ++readerIter ) {
593 BamReader* reader = (*readerIter).first;
594 if ( reader == 0 ) continue;
596 // attempt rewind on BamReader
597 result &= reader->Rewind();
603 void BamMultiReaderPrivate::SaveNextAlignment(BamReader* reader, BamAlignment* alignment) {
605 // must be in core mode && NOT sorting by read name to call GNACore()
606 if ( m_isCoreMode && m_sortOrder != BamMultiReader::SortedByReadName ) {
607 if ( reader->GetNextAlignmentCore(*alignment) )
608 m_alignments->Add( make_pair(reader, alignment) );
611 // not in core mode and/or sorting by readname, must call GNA()
613 if ( reader->GetNextAlignment(*alignment) )
614 m_alignments->Add( make_pair(reader, alignment) );
618 // sets the index caching mode on the readers
619 void BamMultiReaderPrivate::SetIndexCacheMode(const BamIndex::IndexCacheMode mode) {
621 // iterate over readers
622 vector<ReaderAlignment>::iterator readerIter = m_readers.begin();
623 vector<ReaderAlignment>::iterator readerEnd = m_readers.end();
624 for ( ; readerIter != readerEnd; ++readerIter ) {
625 BamReader* reader = (*readerIter).first;
626 if ( reader == 0 ) continue;
628 // set reader's index cache mode
629 reader->SetIndexCacheMode(mode);
633 bool BamMultiReaderPrivate::SetRegion(const BamRegion& region) {
635 // NB: While it may make sense to track readers in which we can
636 // successfully SetRegion, In practice a failure of SetRegion means "no
637 // alignments here." It makes sense to simply accept the failure,
638 // UpdateAlignments(), and continue.
640 // iterate over alignments
641 vector<ReaderAlignment>::iterator readerIter = m_readers.begin();
642 vector<ReaderAlignment>::iterator readerEnd = m_readers.end();
643 for ( ; readerIter != readerEnd; ++readerIter ) {
644 BamReader* reader = (*readerIter).first;
645 if ( reader == 0 ) continue;
647 // attempt to set BamReader's region of interest
648 if ( !reader->SetRegion(region) ) {
649 cerr << "BamMultiReader ERROR: could not jump " << reader->GetFilename() << " to "
650 << region.LeftRefID << ":" << region.LeftPosition << ".."
651 << region.RightRefID << ":" << region.RightPosition << endl;
655 // update alignment cache & return success
656 UpdateAlignmentCache();
660 void BamMultiReaderPrivate::SetSortOrder(const BamMultiReader::SortOrder& order) {
662 // skip if no change needed
663 if ( m_sortOrder == order ) return;
665 // set new sort order
668 // create new alignment cache based on sort order
669 IBamMultiMerger* newAlignmentCache = CreateMergerForCurrentSortOrder();
670 if ( newAlignmentCache == 0 ) return; // print error?
672 // copy old cache contents to new cache
673 while ( m_alignments->Size() > 0 ) {
674 ReaderAlignment value = m_alignments->TakeFirst(); // retrieves & 'pops'
675 newAlignmentCache->Add(value);
678 // remove old cache structure & point to new cache
680 m_alignments = newAlignmentCache;
683 // splits the entire header into a list of strings
684 const vector<string> BamMultiReaderPrivate::SplitHeaderText(const string& headerText) const {
686 stringstream header(headerText);
689 vector<string> lines;
690 while ( getline(header, item) )
691 lines.push_back(item);
695 // updates our alignment cache
696 void BamMultiReaderPrivate::UpdateAlignmentCache(void) {
698 // skip if invalid alignment cache
699 if ( m_alignments == 0 ) return;
702 m_alignments->Clear();
704 // seed cache with fully-populated alignments
705 // further updates will fill with full/core-only as requested
706 m_isCoreMode = false;
708 // iterate over readers
709 vector<ReaderAlignment>::iterator readerIter = m_readers.begin();
710 vector<ReaderAlignment>::iterator readerEnd = m_readers.end();
711 for ( ; readerIter != readerEnd; ++readerIter ) {
712 BamReader* reader = (*readerIter).first;
713 BamAlignment* alignment = (*readerIter).second;
714 if ( reader == 0 || alignment == 0 ) continue;
716 // save next alignment from each reader in cache
717 SaveNextAlignment(reader, alignment);
721 // ValidateReaders checks that all the readers point to BAM files representing
722 // alignments against the same set of reference sequences, and that the
723 // sequences are identically ordered. If these checks fail the operation of
724 // the multireader is undefined, so we force program exit.
725 void BamMultiReaderPrivate::ValidateReaders(void) const {
727 // retrieve first reader data
728 const BamReader* firstReader = m_readers.front().first;
729 if ( firstReader == 0 ) return;
730 const RefVector firstReaderRefData = firstReader->GetReferenceData();
731 const int firstReaderRefCount = firstReader->GetReferenceCount();
732 const int firstReaderRefSize = firstReaderRefData.size();
734 // iterate over all readers
735 vector<ReaderAlignment>::const_iterator readerIter = m_readers.begin();
736 vector<ReaderAlignment>::const_iterator readerEnd = m_readers.end();
737 for ( ; readerIter != readerEnd; ++readerIter ) {
739 // get current reader data
740 BamReader* reader = (*readerIter).first;
741 if ( reader == 0 ) continue;
742 const RefVector currentReaderRefData = reader->GetReferenceData();
743 const int currentReaderRefCount = reader->GetReferenceCount();
744 const int currentReaderRefSize = currentReaderRefData.size();
746 // init container iterators
747 RefVector::const_iterator firstRefIter = firstReaderRefData.begin();
748 RefVector::const_iterator firstRefEnd = firstReaderRefData.end();
749 RefVector::const_iterator currentRefIter = currentReaderRefData.begin();
751 // compare reference counts from BamReader ( & container size, in case of BR error)
752 if ( (currentReaderRefCount != firstReaderRefCount) ||
753 (firstReaderRefSize != currentReaderRefSize) )
755 cerr << "BamMultiReader ERROR: mismatched number of references in " << reader->GetFilename()
756 << " expected " << firstReaderRefCount
757 << " reference sequences but only found " << currentReaderRefCount << endl;
761 // this will be ok; we just checked above that we have identically-sized sets of references
762 // here we simply check if they are all, in fact, equal in content
763 while ( firstRefIter != firstRefEnd ) {
764 const RefData& firstRef = (*firstRefIter);
765 const RefData& currentRef = (*currentRefIter);
767 // compare reference name & length
768 if ( (firstRef.RefName != currentRef.RefName) ||
769 (firstRef.RefLength != currentRef.RefLength) )
771 cerr << "BamMultiReader ERROR: mismatched references found in " << reader->GetFilename()
772 << " expected: " << endl;
774 // print first reader's reference data
775 RefVector::const_iterator refIter = firstReaderRefData.begin();
776 RefVector::const_iterator refEnd = firstReaderRefData.end();
777 for ( ; refIter != refEnd; ++refIter ) {
778 const RefData& entry = (*refIter);
779 cerr << entry.RefName << " " << entry.RefLength << endl;
782 cerr << "but found: " << endl;
784 // print current reader's reference data
785 refIter = currentReaderRefData.begin();
786 refEnd = currentReaderRefData.end();
787 for ( ; refIter != refEnd; ++refIter ) {
788 const RefData& entry = (*refIter);
789 cerr << entry.RefName << " " << entry.RefLength << endl;