+
+ buildAmbiguityCodonSet();
+ }
+
+ /**
+ * programmatic generation of codons including ambiguity codes
+ */
+ public static void buildAmbiguityCodonSet()
+ {
+ if (_ambiguityCodes.size() > 0)
+ {
+ System.err
+ .println("Ignoring multiple calls to buildAmbiguityCodonSet");
+ return;
+ }
+ // Invert the ambiguity code set
+ for (Map.Entry<String, String[]> acode : ambiguityCodes.entrySet())
+ {
+ for (String r : acode.getValue())
+ {
+ List<String> codesfor = _ambiguityCodes.get(r);
+ if (codesfor == null)
+ {
+ _ambiguityCodes.put(r, codesfor = new ArrayList<String>());
+ }
+ if (!codesfor.contains(acode.getKey()))
+ {
+ codesfor.add(acode.getKey());
+ }
+ else
+ {
+ System.err
+ .println("Inconsistency in the IUBMB ambiguity code nomenclature table: collision for "
+ + acode.getKey() + " in residue " + r);
+ }
+ }
+ }
+ // and programmatically add in the ambiguity codes that yield the same amino
+ // acid
+ String[] unambcodons = codonHash2.keySet().toArray(
+ new String[codonHash2.size()]);
+ for (String codon : unambcodons)
+ {
+ String residue = codonHash2.get(codon);
+ String acodon[][] = new String[codon.length()][];
+ for (int i = 0, iSize = codon.length(); i < iSize; i++)
+ {
+ String _ac = "" + codon.charAt(i);
+ List<String> acodes = _ambiguityCodes.get(_ac);
+ if (acodes != null)
+ {
+ acodon[i] = acodes.toArray(new String[acodes.size()]);
+ }
+ else
+ {
+ acodon[i] = new String[] {};
+ }
+ }
+ // enumerate all combinations and test for veracity of translation
+ int tpos[] = new int[codon.length()], cpos[] = new int[codon.length()];
+ for (int i = 0; i < tpos.length; i++)
+ {
+ tpos[i] = -1;
+ }
+ tpos[acodon.length - 1] = 0;
+ int ipos, j;
+ while (tpos[0] < acodon[0].length)
+ {
+ // make all codons for this combination
+ char allres[][] = new char[tpos.length][];
+ String _acodon = "";
+ char _anuc;
+ for (ipos = 0; ipos < tpos.length; ipos++)
+ {
+ if (acodon[ipos].length == 0 || tpos[ipos] < 0)
+ {
+ _acodon += codon.charAt(ipos);
+ allres[ipos] = new char[] { codon.charAt(ipos) };
+ }
+ else
+ {
+ _acodon += acodon[ipos][tpos[ipos]];
+ String[] altbase = ambiguityCodes.get(acodon[ipos][tpos[ipos]]);
+ allres[ipos] = new char[altbase.length];
+ j = 0;
+ for (String ab : altbase)
+ {
+ allres[ipos][j++] = ab.charAt(0);
+ }
+ }
+ }
+ // test all codons for this combination
+ for (ipos = 0; ipos < cpos.length; ipos++)
+ {
+ cpos[ipos] = 0;
+ }
+ boolean valid = true;
+ do
+ {
+ String _codon = "";
+ for (j = 0; j < cpos.length; j++)
+ {
+ _codon += allres[j][cpos[j]];
+ }
+ String tr = codonHash2.get(_codon);
+ if (valid = (tr != null && tr.equals(residue)))
+ {
+ // advance to next combination
+ ipos = acodon.length - 1;
+ while (++cpos[ipos] >= allres[ipos].length && ipos > 0)
+ {
+ cpos[ipos] = 0;
+ ipos--;
+ }
+ }
+ } while (valid && cpos[0] < allres[0].length);
+ if (valid)
+ {
+ // Add this to the set of codons we will translate
+ // System.out.println("Adding ambiguity codon: " + _acodon + " for "
+ // + residue);
+ codonHash2.put(_acodon, residue);
+ }
+ else
+ {
+ // System.err.println("Rejecting ambiguity codon: " + _acodon
+ // + " for " + residue);
+ }
+ // next combination
+ ipos = acodon.length - 1;
+ while (++tpos[ipos] >= acodon[ipos].length && ipos > 0)
+ {
+ tpos[ipos] = -1;
+ ipos--;
+ }
+ }
+ }
+