question on a code line in function protected List<Map<String, Object>> getMigrationMapFromUnderUtilizedHosts(List<PowerHostUtilizationHistory> overUtilizedHosts) in org.cloudbus.cloudsim.power PowerVmAllocationPolicyMigrationAbstract.java

[arounderor]

protected List<Map<String, Object>> getMigrationMapFromUnderUtilizedHosts(
List overUtilizedHosts) {
List<Map<String, Object>> migrationMap = new LinkedList<Map<String, Object>>();
List switchedOffHosts = getSwitchedOffHosts();

	// over-utilized hosts + hosts that are selected to migrate VMs to from over-utilized hosts
	Set<PowerHost> excludedHostsForFindingUnderUtilizedHost = new HashSet<PowerHost>();
	excludedHostsForFindingUnderUtilizedHost.addAll(overUtilizedHosts);
	excludedHostsForFindingUnderUtilizedHost.addAll(switchedOffHosts);
	excludedHostsForFindingUnderUtilizedHost.addAll(extractHostListFromMigrationMap(migrationMap));

Is the last line of the code snippet above useful? migrationMap is just created as a empty List object.