/**
* Main method for the program. Checks that input file is present and readable, then iterates
* through the index printing meta data to stdout.
*/
protected int doWork() {
if (INPUT.getName().endsWith(BAMIndex.BAMIndexSuffix))
log.warn("INPUT should be the BAM file name, not its index file");
IOUtil.assertFileIsReadable(INPUT);
BAMIndexMetaData.printIndexStats(INPUT);
return 0;
}