@Override
		public long getKey(Address addr, boolean create) {
			if (create) {
				throw new IllegalArgumentException("Old address map does not support key creation");
			}
			return factory.getIndex(addr);
		}
Comparator used to identify if an addr occurs before or after the 
start of a key range.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/map/AddressMapDBAdapterNoTable.java