@SuppressWarnings("unchecked") static BytesComparator makeComparator(String comparator) { if (comparator.length() == 0) { // unsorted keys return null; } if (comparator.equals(COMPARATOR_MEMCMP)) { // default comparator return new BytesComparator(new MemcmpRawComparator()); } else if (comparator.startsWith(COMPARATOR_JCLASS)) { String compClassName = comparator.substring(COMPARATOR_JCLASS.length()).trim(); try { Class compClass = Class.forName(compClassName); // use its default ctor to create an instance return new BytesComparator((RawComparator<Object>) compClass .newInstance()); } catch (Exception e) { throw new IllegalArgumentException( "Failed to instantiate comparator: " + comparator + "(" + e.toString() + ")"); } } else { throw new IllegalArgumentException("Unsupported comparator: " + comparator); } }