2 * Jalview - A Sequence Alignment Editor and Viewer ($$Version-Rel$$)
3 * Copyright (C) $$Year-Rel$$ The Jalview Authors
5 * This file is part of Jalview.
7 * Jalview is free software: you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation, either version 3
10 * of the License, or (at your option) any later version.
12 * Jalview is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty
14 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR
15 * PURPOSE. See the GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with Jalview. If not, see <http://www.gnu.org/licenses/>.
19 * The Jalview Authors are detailed in the 'AUTHORS' file.
21 package jalview.analysis;
23 import jalview.datamodel.AlignedCodonFrame;
24 import jalview.datamodel.Alignment;
25 import jalview.datamodel.AlignmentI;
26 import jalview.datamodel.DBRefEntry;
27 import jalview.datamodel.Mapping;
28 import jalview.datamodel.Sequence;
29 import jalview.datamodel.SequenceFeature;
30 import jalview.datamodel.SequenceI;
31 import jalview.util.DBRefUtils;
32 import jalview.util.MapList;
33 import jalview.ws.SequenceFetcherFactory;
34 import jalview.ws.seqfetcher.ASequenceFetcher;
36 import java.util.ArrayList;
37 import java.util.Iterator;
38 import java.util.List;
41 * Functions for cross-referencing sequence databases.
49 * the dataset of the alignment for which we are searching for
50 * cross-references; in some cases we may resolve xrefs by
51 * searching in the dataset
53 private AlignmentI dataset;
56 * the sequences for which we are seeking cross-references
58 private SequenceI[] fromSeqs;
61 * matcher built from dataset
63 SequenceIdMatcher matcher;
66 * sequences found by cross-ref searches to fromSeqs
68 List<SequenceI> rseqs;
74 * the sequences for which we are seeking cross-references
76 * the containing alignment dataset (may be searched to resolve
79 public CrossRef(SequenceI[] seqs, AlignmentI ds)
82 dataset = ds.getDataset() == null ? ds : ds.getDataset();
86 * Returns a list of distinct database sources for which sequences have either
88 * <li>a (dna-to-protein or protein-to-dna) cross-reference</li>
89 * <li>an indirect cross-reference - a (dna-to-protein or protein-to-dna)
90 * reference from another sequence in the dataset which has a cross-reference
91 * to a direct DBRefEntry on the given sequence</li>
95 * - when true, cross-references *from* dna returned. When false,
96 * cross-references *from* protein are returned
99 public List<String> findXrefSourcesForSequences(boolean dna)
101 List<String> sources = new ArrayList<String>();
102 for (SequenceI seq : fromSeqs)
106 findXrefSourcesForSequence(seq, dna, sources);
113 * Returns a list of distinct database sources for which a sequence has either
115 * <li>a (dna-to-protein or protein-to-dna) cross-reference</li>
116 * <li>an indirect cross-reference - a (dna-to-protein or protein-to-dna)
117 * reference from another sequence in the dataset which has a cross-reference
118 * to a direct DBRefEntry on the given sequence</li>
122 * the sequence whose dbrefs we are searching against
124 * when true, context is DNA - so sources identifying protein
125 * products will be returned.
127 * a list of sources to add matches to
129 void findXrefSourcesForSequence(SequenceI seq, boolean fromDna,
130 List<String> sources)
133 * first find seq's xrefs (dna-to-peptide or peptide-to-dna)
135 DBRefEntry[] rfs = DBRefUtils.selectDbRefs(!fromDna, seq.getDBRefs());
136 addXrefsToSources(rfs, sources);
140 * find sequence's direct (dna-to-dna, peptide-to-peptide) xrefs
142 DBRefEntry[] lrfs = DBRefUtils.selectDbRefs(fromDna, seq.getDBRefs());
143 List<SequenceI> foundSeqs = new ArrayList<SequenceI>();
146 * find sequences in the alignment which xref one of these DBRefs
147 * i.e. is xref-ed to a common sequence identifier
149 searchDatasetXrefs(fromDna, seq, lrfs, foundSeqs, null);
152 * add those sequences' (dna-to-peptide or peptide-to-dna) dbref sources
154 for (SequenceI rs : foundSeqs)
156 DBRefEntry[] xrs = DBRefUtils
157 .selectDbRefs(!fromDna, rs.getDBRefs());
158 addXrefsToSources(xrs, sources);
164 * Helper method that adds the source identifiers of some cross-references to
165 * a (non-redundant) list of database sources
170 void addXrefsToSources(DBRefEntry[] xrefs, List<String> sources)
174 for (DBRefEntry ref : xrefs)
177 * avoid duplication e.g. ENSEMBL and Ensembl
179 String source = DBRefUtils.getCanonicalName(ref.getSource());
180 if (!sources.contains(source))
189 * Attempts to find cross-references from the sequences provided in the
190 * constructor to the given source database. Cross-references may be found
192 * <li>in dbrefs on the sequence which hold a mapping to a sequence
194 * <li>provided with a fetched sequence (e.g. ENA translation), or</li>
195 * <li>populated previously after getting cross-references</li>
197 * <li>as other sequences in the alignment which share a dbref identifier with
199 * <li>by fetching from the remote database</li>
201 * The cross-referenced sequences, and mappings to them, are added to the
205 * @return cross-referenced sequences (as dataset sequences)
207 public Alignment findXrefSequences(String source, boolean fromDna)
210 rseqs = new ArrayList<SequenceI>();
211 AlignedCodonFrame cf = new AlignedCodonFrame();
212 matcher = new SequenceIdMatcher(
213 dataset.getSequences());
215 for (SequenceI seq : fromSeqs)
218 while (dss.getDatasetSequence() != null)
220 dss = dss.getDatasetSequence();
222 boolean found = false;
223 DBRefEntry[] xrfs = DBRefUtils
224 .selectDbRefs(!fromDna, dss.getDBRefs());
225 // ENST & ENSP comes in to both Protein and nucleotide, so we need to
228 if ((xrfs == null || xrfs.length == 0) && dataset != null)
231 * found no suitable dbrefs on sequence - look for sequences in the
232 * alignment which share a dbref with this one
234 DBRefEntry[] lrfs = DBRefUtils.selectDbRefs(fromDna,
238 * find sequences (except this one!), of complementary type,
239 * which have a dbref to an accession id for this sequence,
240 * and add them to the results
242 found = searchDatasetXrefs(fromDna, dss, lrfs, rseqs, cf);
244 if (xrfs == null && !found)
247 * no dbref to source on this sequence or matched
248 * complementary sequence in the dataset
252 List<DBRefEntry> sourceRefs = DBRefUtils.searchRefsForSource(xrfs,
254 Iterator<DBRefEntry> refIterator = sourceRefs.iterator();
255 // At this point, if we are retrieving Ensembl, we still don't filter out
256 // ENST when looking for protein crossrefs.
257 while (refIterator.hasNext())
259 DBRefEntry xref = refIterator.next();
261 // we're only interested in coding cross-references, not
263 if (xref.hasMap() && xref.getMap().getMap().isTripletMap())
265 SequenceI mappedTo = xref.getMap().getTo();
266 if (mappedTo != null)
269 * dbref contains the sequence it maps to; add it to the
270 * results unless we have done so already (could happen if
271 * fetching xrefs for sequences which have xrefs in common)
272 * for example: UNIPROT {P0CE19, P0CE20} -> EMBL {J03321, X06707}
276 * problem: matcher.findIdMatch() is lenient - returns a sequence
277 * with a dbref to the search arg e.g. ENST for ENSP - wrong
278 * but findInDataset() matches ENSP when looking for Uniprot...
280 SequenceI matchInDataset = findInDataset(xref);
281 if (matchInDataset != null && xref.getMap().getTo() != null
282 && matchInDataset != xref.getMap().getTo())
285 .println("Implementation problem (reopen JAL-2154): CrossRef.findInDataset seems to have recovered a different sequence than the one explicitly mapped for xref."
289 + xref.getMap().getTo()
293 /*matcher.findIdMatch(mappedTo);*/
294 if (matchInDataset != null)
296 if (!rseqs.contains(matchInDataset))
298 rseqs.add(matchInDataset);
300 // even if rseqs contained matchInDataset - check mappings between
301 // these seqs are added
302 // need to try harder to only add unique mappings
303 if (xref.getMap().getMap().isTripletMap()
304 && dataset.getMapping(seq, matchInDataset) == null
305 && cf.getMappingBetween(seq, matchInDataset) == null)
307 // materialise a mapping for highlighting between these
311 cf.addMap(dss, matchInDataset, xref.getMap().getMap(),
312 xref.getMap().getMappedFromId());
316 cf.addMap(matchInDataset, dss, xref.getMap().getMap()
317 .getInverse(), xref.getMap().getMappedFromId());
321 refIterator.remove();
324 // TODO: need to determine if this should be a deriveSequence
325 SequenceI rsq = new Sequence(mappedTo);
327 if (xref.getMap().getMap().isTripletMap())
329 // get sense of map correct for adding to product alignment.
332 // map is from dna seq to a protein product
333 cf.addMap(dss, rsq, xref.getMap().getMap(), xref.getMap()
338 // map should be from protein seq to its coding dna
339 cf.addMap(rsq, dss, xref.getMap().getMap().getInverse(),
340 xref.getMap().getMappedFromId());
348 SequenceI matchedSeq = matcher.findIdMatch(xref.getSource() + "|"
349 + xref.getAccessionId());
350 // if there was a match, check it's at least the right type of
352 if (matchedSeq != null && matchedSeq.isProtein() == fromDna)
354 if (constructMapping(seq, matchedSeq, xref, cf, fromDna))
363 // do a bit more work - search for sequences with references matching
364 // xrefs on this sequence.
365 found = searchDataset(fromDna, dss, xref, rseqs, cf, false);
369 refIterator.remove();
374 * fetch from source database any dbrefs we haven't resolved up to here
376 if (!sourceRefs.isEmpty())
378 retrieveCrossRef(sourceRefs, seq, xrfs, fromDna, cf);
382 Alignment ral = null;
383 if (rseqs.size() > 0)
385 ral = new Alignment(rseqs.toArray(new SequenceI[rseqs.size()]));
388 dataset.addCodonFrame(cf);
394 private void retrieveCrossRef(List<DBRefEntry> sourceRefs, SequenceI seq,
395 DBRefEntry[] xrfs, boolean fromDna, AlignedCodonFrame cf)
397 ASequenceFetcher sftch = SequenceFetcherFactory.getSequenceFetcher();
398 SequenceI[] retrieved = null;
399 SequenceI dss = seq.getDatasetSequence() == null ? seq : seq
400 .getDatasetSequence();
401 // first filter in case we are retrieving crossrefs that have already been
402 // retrieved. this happens for cases where a database record doesn't yield
403 // protein products for CDS
404 removeAlreadyRetrievedSeqs(sourceRefs, fromDna);
405 if (sourceRefs.size() == 0)
407 // no more work to do! We already had all requested sequence records in
413 retrieved = sftch.getSequences(sourceRefs, !fromDna);
414 } catch (Exception e)
417 .println("Problem whilst retrieving cross references for Sequence : "
422 if (retrieved != null)
424 updateDbrefMappings(seq, xrfs, retrieved, cf, fromDna);
425 for (SequenceI retrievedSequence : retrieved)
427 // dataset gets contaminated ccwith non-ds sequences. why ??!
428 // try: Ensembl -> Nuc->Ensembl, Nuc->Uniprot-->Protein->EMBL->
429 SequenceI retrievedDss = retrievedSequence.getDatasetSequence() == null ? retrievedSequence
430 : retrievedSequence.getDatasetSequence();
431 DBRefEntry[] dbr = retrievedSequence.getDBRefs();
435 * Search dataset for sequences with a primary reference contained in
439 * - list of references to filter.
441 * - type of sequence to search for matching primary reference.
443 private void removeAlreadyRetrievedSeqs(List<DBRefEntry> sourceRefs,
446 DBRefEntry[] dbrSourceSet = sourceRefs.toArray(new DBRefEntry[0]);
447 for (SequenceI sq : dataset.getSequences())
449 boolean dupeFound = false;
450 // !fromDna means we are looking only for nucleotide sequences, not
452 if (sq.isProtein() == fromDna)
454 for (DBRefEntry dbr : sq.getPrimaryDBRefs())
456 for (DBRefEntry found : DBRefUtils.searchRefs(dbrSourceSet, dbr))
458 sourceRefs.remove(found);
465 dbrSourceSet = sourceRefs.toArray(new DBRefEntry[0]);
471 for (DBRefEntry dbref : dbr)
473 // find any entry where we should put in the sequence being
474 // cross-referenced into the map
475 Mapping map = dbref.getMap();
478 if (map.getTo() != null && map.getMap() != null)
480 // TODO findInDataset requires exact sequence match but
481 // 'congruent' test is only for the mapped part
482 // maybe not a problem in practice since only ENA provide a
483 // mapping and it is to the full protein translation of CDS
484 SequenceI matched = findInDataset(dbref);
485 // matcher.findIdMatch(map.getTo());
489 * already got an xref to this sequence; update this
490 * map to point to the same sequence, and add
491 * any new dbrefs to it
493 DBRefEntry[] toRefs = map.getTo().getDBRefs();
496 for (DBRefEntry ref : toRefs)
498 matched.addDBRef(ref); // add or update mapping
505 if (dataset.findIndex(map.getTo()) == -1)
507 dataset.addSequence(map.getTo());
508 matcher.add(map.getTo());
513 // compare ms with dss and replace with dss in mapping
514 // if map is congruent
515 SequenceI ms = map.getTo();
516 int sf = map.getMap().getToLowest();
517 int st = map.getMap().getToHighest();
518 SequenceI mappedrg = ms.getSubSequence(sf, st);
519 // SequenceI loc = dss.getSubSequence(sf, st);
520 if (mappedrg.getLength() > 0
521 && ms.getSequenceAsString().equals(
522 dss.getSequenceAsString()))
523 // && mappedrg.getSequenceAsString().equals(
524 // loc.getSequenceAsString()))
526 String msg = "Mapping updated from " + ms.getName()
527 + " to retrieved crossreference "
529 System.out.println(msg);
533 * give the reverse reference the inverse mapping
534 * (if it doesn't have one already)
536 setReverseMapping(dss, dbref, cf);
539 * copy sequence features as well, avoiding
540 * duplication (e.g. same variation from two
543 SequenceFeature[] sfs = ms.getSequenceFeatures();
546 for (SequenceFeature feat : sfs)
549 * make a flyweight feature object which ignores Parent
550 * attribute in equality test; this avoids creating many
551 * otherwise duplicate exon features on genomic sequence
553 SequenceFeature newFeature = new SequenceFeature(
557 public boolean equals(Object o)
559 return super.equals(o, true);
562 dss.addSequenceFeature(newFeature);
566 cf.addMap(retrievedDss, map.getTo(), map.getMap());
567 } catch (Exception e)
570 .println("Exception when consolidating Mapped sequence set...");
571 e.printStackTrace(System.err);
577 retrievedSequence.updatePDBIds();
578 rseqs.add(retrievedDss);
579 if (dataset.findIndex(retrievedDss) == -1)
581 dataset.addSequence(retrievedDss);
582 matcher.add(retrievedDss);
588 * Sets the inverse sequence mapping in the corresponding dbref of the mapped
589 * to sequence (if any). This is used after fetching a cross-referenced
590 * sequence, if the fetched sequence has a mapping to the original sequence,
591 * to set the mapping in the original sequence's dbref.
594 * the sequence mapped from
598 void setReverseMapping(SequenceI mapFrom, DBRefEntry dbref,
599 AlignedCodonFrame mappings)
601 SequenceI mapTo = dbref.getMap().getTo();
606 DBRefEntry[] dbrefs = mapTo.getDBRefs();
611 for (DBRefEntry toRef : dbrefs)
613 if (toRef.hasMap() && mapFrom == toRef.getMap().getTo())
616 * found the reverse dbref; update its mapping if null
618 if (toRef.getMap().getMap() == null)
620 MapList inverse = dbref.getMap().getMap().getInverse();
621 toRef.getMap().setMap(inverse);
622 mappings.addMap(mapTo, mapFrom, inverse);
629 * Returns the first identical sequence in the dataset if any, else null
634 SequenceI findInDataset(DBRefEntry xref)
636 if (xref == null || !xref.hasMap() || xref.getMap().getTo() == null)
640 SequenceI mapsTo = xref.getMap().getTo();
641 String name = xref.getAccessionId();
642 String name2 = xref.getSource() + "|" + name;
643 SequenceI dss = mapsTo.getDatasetSequence() == null ? mapsTo : mapsTo
644 .getDatasetSequence();
645 // first check ds if ds is directly referenced
646 if (dataset.findIndex(dss) > -1)
651 for (SequenceI seq : dataset.getSequences())
654 * clumsy alternative to using SequenceIdMatcher which currently
655 * returns sequences with a dbref to the matched accession id
656 * which we don't want
658 if (name.equals(seq.getName()) || seq.getName().startsWith(name2))
660 if (sameSequence(seq, dss))
670 * Answers true if seq1 and seq2 contain exactly the same characters (ignoring
671 * case), else false. This method compares the lengths, then each character in
672 * turn, in order to 'fail fast'. For case-sensitive comparison, it would be
673 * possible to use Arrays.equals(seq1.getSequence(), seq2.getSequence()).
679 // TODO move to Sequence / SequenceI
680 static boolean sameSequence(SequenceI seq1, SequenceI seq2)
686 if (seq1 == null || seq2 == null)
690 char[] c1 = seq1.getSequence();
691 char[] c2 = seq2.getSequence();
692 if (c1.length != c2.length)
696 for (int i = 0; i < c1.length; i++)
698 int diff = c1[i] - c2[i];
700 * same char or differ in case only ('a'-'A' == 32)
702 if (diff != 0 && diff != 32 && diff != -32)
711 * Updates any empty mappings in the cross-references with one to a compatible
712 * retrieved sequence if found, and adds any new mappings to the
720 void updateDbrefMappings(SequenceI mapFrom, DBRefEntry[] xrefs,
721 SequenceI[] retrieved, AlignedCodonFrame acf, boolean fromDna)
723 SequenceIdMatcher idMatcher = new SequenceIdMatcher(retrieved);
724 for (DBRefEntry xref : xrefs)
728 String targetSeqName = xref.getSource() + "|"
729 + xref.getAccessionId();
730 SequenceI[] matches = idMatcher.findAllIdMatches(targetSeqName);
735 for (SequenceI seq : matches)
737 constructMapping(mapFrom, seq, xref, acf, fromDna);
744 * Tries to make a mapping between sequences. If successful, adds the mapping
745 * to the dbref and the mappings collection and answers true, otherwise
746 * answers false. The following methods of making are mapping are tried in
749 * <li>if 'mapTo' holds a mapping to 'mapFrom', take the inverse; this is, for
750 * example, the case after fetching EMBL cross-references for a Uniprot
752 * <li>else check if the dna translates exactly to the protein (give or take
753 * start and stop codons></li>
754 * <li>else try to map based on CDS features on the dna sequence</li>
763 boolean constructMapping(SequenceI mapFrom, SequenceI mapTo,
764 DBRefEntry xref, AlignedCodonFrame mappings, boolean fromDna)
766 MapList mapping = null;
767 SequenceI dsmapFrom = mapFrom.getDatasetSequence() == null ? mapFrom
768 : mapFrom.getDatasetSequence();
769 SequenceI dsmapTo = mapTo.getDatasetSequence() == null ? mapTo
770 : mapTo.getDatasetSequence();
772 * look for a reverse mapping, if found make its inverse.
773 * Note - we do this on dataset sequences only.
775 if (dsmapTo.getDBRefs() != null)
777 for (DBRefEntry dbref : dsmapTo.getDBRefs())
779 String name = dbref.getSource() + "|" + dbref.getAccessionId();
780 if (dbref.hasMap() && dsmapFrom.getName().startsWith(name))
783 * looks like we've found a map from 'mapTo' to 'mapFrom'
784 * - invert it to make the mapping the other way
786 MapList reverse = dbref.getMap().getMap().getInverse();
787 xref.setMap(new Mapping(dsmapTo, reverse));
788 mappings.addMap(mapFrom, dsmapTo, reverse);
796 mapping = AlignmentUtils.mapCdnaToProtein(mapTo, mapFrom);
800 mapping = AlignmentUtils.mapCdnaToProtein(mapFrom, mapTo);
803 mapping = mapping.getInverse();
810 xref.setMap(new Mapping(mapTo, mapping));
813 * and add a reverse DbRef with the inverse mapping
815 if (mapFrom.getDatasetSequence() != null && false)
816 // && mapFrom.getDatasetSequence().getSourceDBRef() != null)
818 // possible need to search primary references... except, why doesn't xref
819 // == getSourceDBRef ??
820 // DBRefEntry dbref = new DBRefEntry(mapFrom.getDatasetSequence()
821 // .getSourceDBRef());
822 // dbref.setMap(new Mapping(mapFrom.getDatasetSequence(), mapping
824 // mapTo.addDBRef(dbref);
829 AlignmentUtils.computeProteinFeatures(mapFrom, mapTo, mapping);
830 mappings.addMap(mapFrom, mapTo, mapping);
834 mappings.addMap(mapTo, mapFrom, mapping.getInverse());
841 * find references to lrfs in the cross-reference set of each sequence in
842 * dataset (that is not equal to sequenceI) Identifies matching DBRefEntry
843 * based on source and accession string only - Map and Version are nulled.
846 * - true if context was searching from Dna sequences, false if
847 * context was searching from Protein sequences
851 * @return true if matches were found.
853 private boolean searchDatasetXrefs(boolean fromDna, SequenceI sequenceI,
854 DBRefEntry[] lrfs, List<SequenceI> foundSeqs, AlignedCodonFrame cf)
856 boolean found = false;
861 for (int i = 0; i < lrfs.length; i++)
863 DBRefEntry xref = new DBRefEntry(lrfs[i]);
865 xref.setVersion(null);
867 found |= searchDataset(fromDna, sequenceI, xref, foundSeqs, cf, false);
873 * Searches dataset for DBRefEntrys matching the given one (xrf) and adds the
874 * associated sequence to rseqs
877 * true if context was searching for refs *from* dna sequence, false
878 * if context was searching for refs *from* protein sequence
880 * a sequence to ignore (start point of search)
882 * a cross-reference to try to match
884 * result list to add to
886 * a set of sequence mappings to add to
888 * - indicates the type of relationship between returned sequences,
889 * xrf, and sequenceI that is required.
891 * <li>direct implies xrf is a primary reference for sequenceI AND
892 * the sequences to be located (eg a uniprot ID for a protein
893 * sequence, and a uniprot ref on a transcript sequence).</li>
894 * <li>indirect means xrf is a cross reference with respect to
895 * sequenceI or all the returned sequences (eg a genomic reference
896 * associated with a locus and one or more transcripts)</li>
898 * @return true if relationship found and sequence added.
900 boolean searchDataset(boolean fromDna, SequenceI fromSeq, DBRefEntry xrf,
901 List<SequenceI> foundSeqs, AlignedCodonFrame mappings,
904 boolean found = false;
909 if (dataset.getSequences() == null)
911 System.err.println("Empty dataset sequence set - NO VECTOR");
915 synchronized (ds = dataset.getSequences())
917 for (SequenceI nxt : ds)
921 if (nxt.getDatasetSequence() != null)
924 .println("Implementation warning: CrossRef initialised with a dataset alignment with non-dataset sequences in it! ("
925 + nxt.getDisplayId(true)
926 + " has ds reference "
927 + nxt.getDatasetSequence().getDisplayId(true)
930 if (nxt == fromSeq || nxt == fromSeq.getDatasetSequence())
935 * only look at same molecule type if 'direct', or
936 * complementary type if !direct
939 boolean isDna = !nxt.isProtein();
940 if (direct ? (isDna != fromDna) : (isDna == fromDna))
942 // skip this sequence because it is wrong molecule type
947 // look for direct or indirect references in common
948 DBRefEntry[] poss = nxt.getDBRefs();
949 List<DBRefEntry> cands = null;
951 // todo: indirect specifies we select either direct references to nxt
952 // that match xrf which is indirect to sequenceI, or indirect
953 // references to nxt that match xrf which is direct to sequenceI
954 cands = DBRefUtils.searchRefs(poss, xrf);
957 // poss = DBRefUtils.selectDbRefs(nxt.isProtein()!fromDna, poss);
958 // cands = DBRefUtils.searchRefs(poss, xrf);
960 if (!cands.isEmpty())
962 if (foundSeqs.contains(nxt))
968 if (mappings != null && !direct)
971 * if the matched sequence has mapped dbrefs to
972 * protein product / cdna, add equivalent mappings to
973 * our source sequence
975 for (DBRefEntry candidate : cands)
977 Mapping mapping = candidate.getMap();
980 MapList map = mapping.getMap();
981 if (mapping.getTo() != null
982 && map.getFromRatio() != map.getToRatio())
985 * add a mapping, as from dna to peptide sequence
987 if (map.getFromRatio() == 3)
989 mappings.addMap(nxt, fromSeq, map);
993 mappings.addMap(nxt, fromSeq, map.getInverse());