@Override
public boolean passesFilter(SAMRecord bsRead) {
// passes filter if read is not mapped
if (bsRead.getReadUnmappedFlag()) return true;
// if valid mapping orientation not required
// read passes filter
if (this.getFilterValue() == false) return true;
// else return true if read has valid BS mapping orientation
return bsRead.getCharacterAttribute("BO") == 'V';
}
