/**
* Trim a variant by removing common prefix and suffix from each call and reference and adjusting
* all the position information accordingly.
*
* @param original the original call
* @return trimmed variant (possibly original if no change made)
*/
static Variant trim(final Variant original) {
final String ref = original.getLocus().getRefNts();
if (ref.length() == 0) {
// Cannot possibly trim if we are inserting, all bases are to be inserted
return original;
}
// Compute set of called alleles and exit if there are none
final HashSet<String> catSet = extractCalledAlleles(original);
if (catSet.size() == 0) {
return original;
}
// Include actual reference sequence (this will not be "")
assert ref.length() > 0;
catSet.add(ref);
// Compute maximal clip positions based on set of alleles
final String[] cats = catSet.toArray(new String[catSet.size()]);
final int rightClip = StringUtils.longestSuffix(cats);
final int leftClip = StringUtils.longestPrefix(rightClip, cats);
// final int leftClip = StringUtils.longestPrefix(cats);
// final int rightClip = StringUtils.longestSuffix(cats, leftClip);
// Quick exit if no trimming is possible
if (leftClip == 0 && rightClip == 0) {
return original;
}
// Create new locus, will be "" for case of pure insertion
final VariantLocus newLocus = createLocus(original, leftClip, rightClip);
final VariantSample[] newSamples;
if (original.getNumberOfSamples() > 0) {
// trim description
Description oldDescription = DescriptionNone.SINGLETON;
for (int i = 0; i < original.getNumberOfSamples(); i++) {
if (original.getSample(i) != null
&& !(original.getSample(i).getStats().counts().getDescription()
instanceof DescriptionNone)) {
oldDescription = original.getSample(i).getStats().counts().getDescription();
}
}
final String[] alleles = new String[oldDescription.size()];
final int[] alleleMap = new int[oldDescription.size()];
for (int i = 0; i < oldDescription.size(); i++) {
final String clipped = StringUtils.clip(oldDescription.name(i), leftClip, rightClip);
alleles[i] = clipped;
alleleMap[i] = i;
}
final Description newDescription = new DescriptionCommon(alleles);
// Create new trimmed samples
newSamples = createVariants(original, leftClip, rightClip, newDescription, alleleMap);
} else {
newSamples = new VariantSample[0];
}
// Create new variant from the new samples
final Variant result = new Variant(newLocus, newSamples);
Variant.copy(original, result);
// This must be done after the copy
result.setPossibleCause(createVariantName(leftClip, rightClip, original.getPossibleCause()));
result.setTrimmed();
// System.err.println(original);
// System.err.println(result);
return result;
}
