1 // ***************************************************************************
2 // BamMultiReader_p.cpp (c) 2010 Derek Barnett, Erik Garrison
3 // Marth Lab, Department of Biology, Boston College
4 // ---------------------------------------------------------------------------
5 // Last modified: 3 October 2011 (DB)
6 // ---------------------------------------------------------------------------
7 // Functionality for simultaneously reading multiple BAM files
8 // *************************************************************************
10 #include <api/BamAlignment.h>
11 #include <api/BamMultiReader.h>
12 #include <api/SamConstants.h>
13 #include <api/algorithms/Sort.h>
14 #include <api/internal/BamMultiReader_p.h>
15 using namespace BamTools;
16 using namespace BamTools::Internal;
26 BamMultiReaderPrivate::BamMultiReaderPrivate(void)
31 BamMultiReaderPrivate::~BamMultiReaderPrivate(void) {
33 // close all open BAM readers (& clean up cache)
37 // close all BAM files
38 void BamMultiReaderPrivate::Close(void) {
39 CloseFiles( Filenames() );
42 // close requested BAM file
43 void BamMultiReaderPrivate::CloseFile(const string& filename) {
44 vector<string> filenames(1, filename);
45 CloseFiles(filenames);
48 // close requested BAM files
49 void BamMultiReaderPrivate::CloseFiles(const vector<string>& filenames) {
51 // iterate over filenames
52 vector<string>::const_iterator filesIter = filenames.begin();
53 vector<string>::const_iterator filesEnd = filenames.end();
54 for ( ; filesIter != filesEnd; ++filesIter ) {
55 const string& filename = (*filesIter);
56 if ( filename.empty() ) continue;
58 // iterate over readers
59 vector<MergeItem>::iterator readerIter = m_readers.begin();
60 vector<MergeItem>::iterator readerEnd = m_readers.end();
61 for ( ; readerIter != readerEnd; ++readerIter ) {
62 MergeItem& item = (*readerIter);
63 BamReader* reader = item.Reader;
64 if ( reader == 0 ) continue;
66 // if reader matches requested filename
67 if ( reader->GetFilename() == filename ) {
69 // remove reader's entry from alignment cache
70 m_alignmentCache->Remove(reader);
72 // clean up reader & its alignment
77 // delete reader's alignment entry
78 BamAlignment* alignment = item.Alignment;
82 // remove reader from reader list
83 m_readers.erase(readerIter);
85 // on match, just go on to next filename
86 // (no need to keep looking and item iterator is invalid now anyway)
92 // make sure alignment cache is cleaned up if all readers closed
93 if ( m_readers.empty() && m_alignmentCache ) {
94 m_alignmentCache->Clear();
95 delete m_alignmentCache;
100 // creates index files for BAM files that don't have them
101 bool BamMultiReaderPrivate::CreateIndexes(const BamIndex::IndexType& type) {
105 // iterate over readers
106 vector<MergeItem>::iterator itemIter = m_readers.begin();
107 vector<MergeItem>::iterator itemEnd = m_readers.end();
108 for ( ; itemIter != itemEnd; ++itemIter ) {
109 MergeItem& item = (*itemIter);
110 BamReader* reader = item.Reader;
111 if ( reader == 0 ) continue;
113 // if reader doesn't have an index, create one
114 if ( !reader->HasIndex() )
115 result &= reader->CreateIndex(type);
121 IMultiMerger* BamMultiReaderPrivate::CreateAlignmentCache(void) const {
124 SamHeader header = GetHeader();
126 // if BAM files are sorted by position
127 if ( header.SortOrder == Constants::SAM_HD_SORTORDER_COORDINATE )
128 return new MultiMerger<Algorithms::Sort::ByPosition>();
130 // if BAM files are sorted by read name
131 if ( header.SortOrder == Constants::SAM_HD_SORTORDER_QUERYNAME )
132 return new MultiMerger<Algorithms::Sort::ByName>();
134 // otherwise "unknown" or "unsorted", use unsorted merger and just read in
135 return new MultiMerger<Algorithms::Sort::Unsorted>();
138 const vector<string> BamMultiReaderPrivate::Filenames(void) const {
140 // init filename container
141 vector<string> filenames;
142 filenames.reserve( m_readers.size() );
144 // iterate over readers
145 vector<MergeItem>::const_iterator itemIter = m_readers.begin();
146 vector<MergeItem>::const_iterator itemEnd = m_readers.end();
147 for ( ; itemIter != itemEnd; ++itemIter ) {
148 const MergeItem& item = (*itemIter);
149 const BamReader* reader = item.Reader;
150 if ( reader == 0 ) continue;
152 // store filename if not empty
153 const string& filename = reader->GetFilename();
154 if ( !filename.empty() )
155 filenames.push_back(filename);
162 SamHeader BamMultiReaderPrivate::GetHeader(void) const {
163 const string& text = GetHeaderText();
164 return SamHeader(text);
167 // makes a virtual, unified header for all the bam files in the multireader
168 string BamMultiReaderPrivate::GetHeaderText(void) const {
170 // N.B. - right now, simply copies all header data from first BAM,
171 // and then appends RG's from other BAM files
172 // TODO: make this more intelligent wrt other header lines/fields
174 // if no readers open
175 const size_t numReaders = m_readers.size();
176 if ( numReaders == 0 ) return string();
178 // retrieve first reader's header
179 const MergeItem& firstItem = m_readers.front();
180 const BamReader* reader = firstItem.Reader;
181 if ( reader == 0 ) return string();
182 SamHeader mergedHeader = reader->GetHeader();
184 // iterate over any remaining readers (skipping the first)
185 for ( size_t i = 1; i < numReaders; ++i ) {
186 const MergeItem& item = m_readers.at(i);
187 const BamReader* reader = item.Reader;
188 if ( reader == 0 ) continue;
190 // retrieve current reader's header
191 const SamHeader currentHeader = reader->GetHeader();
193 // append current reader's RG entries to merged header
194 // N.B. - SamReadGroupDictionary handles duplicate-checking
195 mergedHeader.ReadGroups.Add(currentHeader.ReadGroups);
197 // TODO: merge anything else??
200 // return stringified header
201 return mergedHeader.ToString();
204 // get next alignment among all files
205 bool BamMultiReaderPrivate::GetNextAlignment(BamAlignment& al) {
206 return PopNextCachedAlignment(al, true);
209 // get next alignment among all files without parsing character data from alignments
210 bool BamMultiReaderPrivate::GetNextAlignmentCore(BamAlignment& al) {
211 return PopNextCachedAlignment(al, false);
214 // ---------------------------------------------------------------------------------------
216 // NB: The following GetReferenceX() functions assume that we have identical
217 // references for all BAM files. We enforce this by invoking the
218 // ValidateReaders() method to verify that our reference data is the same
219 // across all files on Open - so we will not encounter a situation in which
220 // there is a mismatch and we are still live.
222 // ---------------------------------------------------------------------------------------
224 // returns the number of reference sequences
225 int BamMultiReaderPrivate::GetReferenceCount(void) const {
227 // handle empty multireader
228 if ( m_readers.empty() )
231 // return reference count from first reader
232 const MergeItem& item = m_readers.front();
233 const BamReader* reader = item.Reader;
234 if ( reader ) return reader->GetReferenceCount();
240 // returns vector of reference objects
241 const RefVector BamMultiReaderPrivate::GetReferenceData(void) const {
243 // handle empty multireader
244 if ( m_readers.empty() )
247 // return reference data from first BamReader
248 const MergeItem& item = m_readers.front();
249 const BamReader* reader = item.Reader;
250 if ( reader ) return reader->GetReferenceData();
256 // returns refID from reference name
257 int BamMultiReaderPrivate::GetReferenceID(const string& refName) const {
259 // handle empty multireader
260 if ( m_readers.empty() )
263 // return reference ID from first BamReader
264 const MergeItem& item = m_readers.front();
265 const BamReader* reader = item.Reader;
266 if ( reader ) return reader->GetReferenceID(refName);
271 // ---------------------------------------------------------------------------------------
273 // returns true if all readers have index data available
274 // this is useful to indicate whether Jump() or SetRegion() are possible
275 bool BamMultiReaderPrivate::HasIndexes(void) const {
277 // handle empty multireader
278 if ( m_readers.empty() )
283 // iterate over readers
284 vector<MergeItem>::const_iterator readerIter = m_readers.begin();
285 vector<MergeItem>::const_iterator readerEnd = m_readers.end();
286 for ( ; readerIter != readerEnd; ++readerIter ) {
287 const MergeItem& item = (*readerIter);
288 const BamReader* reader = item.Reader;
289 if ( reader == 0 ) continue;
291 // see if current reader has index data
292 result &= reader->HasIndex();
298 // returns true if multireader has open readers
299 bool BamMultiReaderPrivate::HasOpenReaders(void) {
301 // iterate over readers
302 vector<MergeItem>::const_iterator readerIter = m_readers.begin();
303 vector<MergeItem>::const_iterator readerEnd = m_readers.end();
304 for ( ; readerIter != readerEnd; ++readerIter ) {
305 const MergeItem& item = (*readerIter);
306 const BamReader* reader = item.Reader;
307 if ( reader == 0 ) continue;
309 // return true whenever an open reader is found
310 if ( reader->IsOpen() ) return true;
317 // performs random-access jump using (refID, position) as a left-bound
318 bool BamMultiReaderPrivate::Jump(int refID, int position) {
320 // NB: While it may make sense to track readers in which we can
321 // successfully Jump, in practice a failure of Jump means "no
322 // alignments here." It makes sense to simply accept the failure,
323 // UpdateAlignments(), and continue.
325 // iterate over readers
326 vector<MergeItem>::iterator readerIter = m_readers.begin();
327 vector<MergeItem>::iterator readerEnd = m_readers.end();
328 for ( ; readerIter != readerEnd; ++readerIter ) {
329 MergeItem& item = (*readerIter);
330 BamReader* reader = item.Reader;
331 if ( reader == 0 ) continue;
333 // attempt jump() on each
334 if ( !reader->Jump(refID, position) ) {
335 cerr << "BamMultiReader ERROR: could not jump " << reader->GetFilename()
336 << " to " << refID << ":" << position << endl;
340 // returns status of cache update
341 return UpdateAlignmentCache();
344 // locate (& load) index files for BAM readers that don't already have one loaded
345 bool BamMultiReaderPrivate::LocateIndexes(const BamIndex::IndexType& preferredType) {
349 // iterate over readers
350 vector<MergeItem>::iterator readerIter = m_readers.begin();
351 vector<MergeItem>::iterator readerEnd = m_readers.end();
352 for ( ; readerIter != readerEnd; ++readerIter ) {
353 MergeItem& item = (*readerIter);
354 BamReader* reader = item.Reader;
355 if ( reader == 0 ) continue;
357 // if reader has no index, try to locate one
358 if ( !reader->HasIndex() )
359 result &= reader->LocateIndex(preferredType);
366 bool BamMultiReaderPrivate::Open(const vector<string>& filenames) {
368 bool openedOk = true;
370 // put all current readers back at beginning
371 openedOk &= Rewind();
373 // iterate over filenames
374 vector<string>::const_iterator filenameIter = filenames.begin();
375 vector<string>::const_iterator filenameEnd = filenames.end();
376 for ( ; filenameIter != filenameEnd; ++filenameIter ) {
377 const string& filename = (*filenameIter);
378 if ( filename.empty() ) continue;
380 // attempt to open BamReader
381 BamReader* reader = new BamReader;
382 const bool readerOpened = reader->Open(filename);
384 // if opened OK, store it
386 m_readers.push_back( MergeItem(reader, new BamAlignment) );
388 // otherwise clean up invalid reader
391 // update method return status
392 openedOk &= readerOpened;
395 // if more than one reader open, check for consistency
396 if ( m_readers.size() > 1 )
397 openedOk &= ValidateReaders();
399 // update alignment cache
400 openedOk &= UpdateAlignmentCache();
406 bool BamMultiReaderPrivate::OpenFile(const std::string& filename) {
407 vector<string> filenames(1, filename);
408 return Open(filenames);
411 bool BamMultiReaderPrivate::OpenIndexes(const vector<string>& indexFilenames) {
413 // TODO: This needs to be cleaner - should not assume same order.
414 // And either way, shouldn't start at first reader. Should start at
415 // first reader without an index?
417 // make sure same number of index filenames as readers
418 if ( m_readers.size() != indexFilenames.size() )
424 // iterate over BamReaders
425 vector<string>::const_iterator indexFilenameIter = indexFilenames.begin();
426 vector<string>::const_iterator indexFilenameEnd = indexFilenames.end();
427 vector<MergeItem>::iterator readerIter = m_readers.begin();
428 vector<MergeItem>::iterator readerEnd = m_readers.end();
429 for ( ; readerIter != readerEnd; ++readerIter ) {
430 MergeItem& item = (*readerIter);
431 BamReader* reader = item.Reader;
433 // open index filename on reader
435 const string& indexFilename = (*indexFilenameIter);
436 result &= reader->OpenIndex(indexFilename);
439 // increment filename iterator, skip if no more index files to open
440 if ( ++indexFilenameIter == indexFilenameEnd )
444 // TODO: any validation needed here??
446 // return success/fail
450 bool BamMultiReaderPrivate::PopNextCachedAlignment(BamAlignment& al, const bool needCharData) {
452 // skip if no alignments available
453 if ( m_alignmentCache == 0 || m_alignmentCache->IsEmpty() )
456 // pop next merge item entry from cache
457 MergeItem item = m_alignmentCache->TakeFirst();
458 BamReader* reader = item.Reader;
459 BamAlignment* alignment = item.Alignment;
460 if ( reader == 0 || alignment == 0 )
463 // set char data if requested
464 if ( needCharData ) {
465 alignment->BuildCharData();
466 alignment->Filename = reader->GetFilename();
469 // store cached alignment into destination parameter (by copy)
472 // load next alignment from reader & store in cache
473 SaveNextAlignment(reader, alignment);
479 // returns BAM file pointers to beginning of alignment data & resets alignment cache
480 bool BamMultiReaderPrivate::Rewind(void) {
482 // attempt to rewind files
483 if ( !RewindReaders() ) {
484 cerr << "BamMultiReader ERROR: could not rewind file(s) successfully";
488 // return status of cache update
489 return UpdateAlignmentCache();
492 // returns BAM file pointers to beginning of alignment data
493 bool BamMultiReaderPrivate::RewindReaders(void) {
497 // iterate over readers
498 vector<MergeItem>::iterator readerIter = m_readers.begin();
499 vector<MergeItem>::iterator readerEnd = m_readers.end();
500 for ( ; readerIter != readerEnd; ++readerIter ) {
501 MergeItem& item = (*readerIter);
502 BamReader* reader = item.Reader;
503 if ( reader == 0 ) continue;
505 // attempt rewind on BamReader
506 result &= reader->Rewind();
512 void BamMultiReaderPrivate::SaveNextAlignment(BamReader* reader, BamAlignment* alignment) {
514 // if can read alignment from reader, store in cache
515 // N.B. - lazy building of alignment's char data,
516 // only populated on demand by sorting merger or client call to GetNextAlignment()
517 if ( reader->GetNextAlignmentCore(*alignment) )
518 m_alignmentCache->Add(MergeItem(reader, alignment));
521 // sets the index caching mode on the readers
522 void BamMultiReaderPrivate::SetIndexCacheMode(const BamIndex::IndexCacheMode mode) {
524 // iterate over readers
525 vector<MergeItem>::iterator readerIter = m_readers.begin();
526 vector<MergeItem>::iterator readerEnd = m_readers.end();
527 for ( ; readerIter != readerEnd; ++readerIter ) {
528 MergeItem& item = (*readerIter);
529 BamReader* reader = item.Reader;
530 if ( reader == 0 ) continue;
532 // set reader's index cache mode
533 reader->SetIndexCacheMode(mode);
537 bool BamMultiReaderPrivate::SetRegion(const BamRegion& region) {
539 // NB: While it may make sense to track readers in which we can
540 // successfully SetRegion, In practice a failure of SetRegion means "no
541 // alignments here." It makes sense to simply accept the failure,
542 // UpdateAlignments(), and continue.
544 // iterate over alignments
545 vector<MergeItem>::iterator readerIter = m_readers.begin();
546 vector<MergeItem>::iterator readerEnd = m_readers.end();
547 for ( ; readerIter != readerEnd; ++readerIter ) {
548 MergeItem& item = (*readerIter);
549 BamReader* reader = item.Reader;
550 if ( reader == 0 ) continue;
552 // attempt to set BamReader's region of interest
553 if ( !reader->SetRegion(region) ) {
554 cerr << "BamMultiReader WARNING: could not jump " << reader->GetFilename() << " to "
555 << region.LeftRefID << ":" << region.LeftPosition << ".."
556 << region.RightRefID << ":" << region.RightPosition << endl;
560 // return status of cache update
561 return UpdateAlignmentCache();
564 // updates our alignment cache
565 bool BamMultiReaderPrivate::UpdateAlignmentCache(void) {
567 // create alignment cache if not created yet
568 if ( m_alignmentCache == 0 ) {
569 m_alignmentCache = CreateAlignmentCache();
570 if ( m_alignmentCache == 0 ) {
576 // clear any prior cache data
577 m_alignmentCache->Clear();
579 // iterate over readers
580 vector<MergeItem>::iterator readerIter = m_readers.begin();
581 vector<MergeItem>::iterator readerEnd = m_readers.end();
582 for ( ; readerIter != readerEnd; ++readerIter ) {
583 MergeItem& item = (*readerIter);
584 BamReader* reader = item.Reader;
585 BamAlignment* alignment = item.Alignment;
586 if ( reader == 0 || alignment == 0 ) continue;
588 // save next alignment from each reader in cache
589 SaveNextAlignment(reader, alignment);
592 // if we get here, ok
596 // ValidateReaders checks that all the readers point to BAM files representing
597 // alignments against the same set of reference sequences, and that the
598 // sequences are identically ordered. If these checks fail the operation of
599 // the multireader is undefined, so we force program exit.
600 bool BamMultiReaderPrivate::ValidateReaders(void) const {
602 // skip if no readers opened
603 if ( m_readers.empty() )
606 // retrieve first reader
607 const MergeItem& firstItem = m_readers.front();
608 const BamReader* firstReader = firstItem.Reader;
609 if ( firstReader == 0 ) return false;
611 // retrieve first reader's header data
612 const SamHeader& firstReaderHeader = firstReader->GetHeader();
613 const string& firstReaderSortOrder = firstReaderHeader.SortOrder;
615 // retrieve first reader's reference data
616 const RefVector& firstReaderRefData = firstReader->GetReferenceData();
617 const int firstReaderRefCount = firstReader->GetReferenceCount();
618 const int firstReaderRefSize = firstReaderRefData.size();
620 // iterate over all readers
621 vector<MergeItem>::const_iterator readerIter = m_readers.begin();
622 vector<MergeItem>::const_iterator readerEnd = m_readers.end();
623 for ( ; readerIter != readerEnd; ++readerIter ) {
624 const MergeItem& item = (*readerIter);
625 BamReader* reader = item.Reader;
626 if ( reader == 0 ) continue;
628 // get current reader's header data
629 const SamHeader& currentReaderHeader = reader->GetHeader();
630 const string& currentReaderSortOrder = currentReaderHeader.SortOrder;
632 // check compatible sort order
633 if ( currentReaderSortOrder != firstReaderSortOrder ) {
635 cerr << "BamMultiReader ERROR: mismatched sort order in " << reader->GetFilename()
636 << ", expected " << firstReaderSortOrder
637 << ", but found " << currentReaderSortOrder << endl;
641 // get current reader's reference data
642 const RefVector currentReaderRefData = reader->GetReferenceData();
643 const int currentReaderRefCount = reader->GetReferenceCount();
644 const int currentReaderRefSize = currentReaderRefData.size();
646 // init reference data iterators
647 RefVector::const_iterator firstRefIter = firstReaderRefData.begin();
648 RefVector::const_iterator firstRefEnd = firstReaderRefData.end();
649 RefVector::const_iterator currentRefIter = currentReaderRefData.begin();
651 // compare reference counts from BamReader ( & container size, in case of BR error)
652 if ( (currentReaderRefCount != firstReaderRefCount) ||
653 (firstReaderRefSize != currentReaderRefSize) )
655 cerr << "BamMultiReader ERROR: mismatched number of references in " << reader->GetFilename()
656 << " expected " << firstReaderRefCount
657 << " reference sequences but only found " << currentReaderRefCount << endl;
661 // this will be ok; we just checked above that we have identically-sized sets of references
662 // here we simply check if they are all, in fact, equal in content
663 while ( firstRefIter != firstRefEnd ) {
664 const RefData& firstRef = (*firstRefIter);
665 const RefData& currentRef = (*currentRefIter);
667 // compare reference name & length
668 if ( (firstRef.RefName != currentRef.RefName) ||
669 (firstRef.RefLength != currentRef.RefLength) )
671 cerr << "BamMultiReader ERROR: mismatched references found in " << reader->GetFilename()
672 << " expected: " << endl;
674 // print first reader's reference data
675 RefVector::const_iterator refIter = firstReaderRefData.begin();
676 RefVector::const_iterator refEnd = firstReaderRefData.end();
677 for ( ; refIter != refEnd; ++refIter ) {
678 const RefData& entry = (*refIter);
679 cerr << entry.RefName << " " << entry.RefLength << endl;
682 cerr << "but found: " << endl;
684 // print current reader's reference data
685 refIter = currentReaderRefData.begin();
686 refEnd = currentReaderRefData.end();
687 for ( ; refIter != refEnd; ++refIter ) {
688 const RefData& entry = (*refIter);
689 cerr << entry.RefName << " " << entry.RefLength << endl;
701 // if we get here, everything checks out