public void OnSelectHost() {
    MoveHost model = (MoveHost) getWindow();

    if (model.getProgress() != null) {
      return;
    }

    if (!model.Validate()) {
      return;
    }

    model.setSelectedHosts(new java.util.ArrayList<VDS>());
    for (EntityModel a : Linq.<EntityModel>Cast(model.getItems())) {
      if (a.getIsSelected()) {
        model.getSelectedHosts().add((VDS) a.getEntity());
      }
    }

    VDSGroup cluster = (VDSGroup) model.getCluster().getSelectedItem();

    java.util.ArrayList<VdcActionParametersBase> paramerterList =
        new java.util.ArrayList<VdcActionParametersBase>();
    for (VDS host : model.getSelectedHosts()) {
      // Try to change host's cluster as neccessary.
      if (host.getvds_group_id() != null && !host.getvds_group_id().equals(cluster.getId())) {
        paramerterList.add(new ChangeVDSClusterParameters(cluster.getId(), host.getId()));
      }
    }
    model.StartProgress(null);
    Frontend.RunMultipleAction(
        VdcActionType.ChangeVDSCluster,
        paramerterList,
        new IFrontendMultipleActionAsyncCallback() {
          @Override
          public void Executed(FrontendMultipleActionAsyncResult result) {

            ClusterGuideModel clusterGuideModel = (ClusterGuideModel) result.getState();
            java.util.ArrayList<VDS> hosts =
                ((MoveHost) clusterGuideModel.getWindow()).getSelectedHosts();
            java.util.ArrayList<VdcReturnValueBase> retVals =
                (java.util.ArrayList<VdcReturnValueBase>) result.getReturnValue();
            if (retVals != null && hosts.size() == retVals.size()) {
              int i = 0;
              for (VDS selectedHost : hosts) {
                if (selectedHost.getstatus() == VDSStatus.PendingApproval
                    && retVals.get(i) != null
                    && retVals.get(i).getSucceeded()) {
                  Frontend.RunAction(
                      VdcActionType.ApproveVds, new ApproveVdsParameters(selectedHost.getId()));
                }
              }
              i++;
            }
            clusterGuideModel.getWindow().StopProgress();
            clusterGuideModel.Cancel();
            clusterGuideModel.PostAction();
          }
        },
        this);
  }
  private void UpdateOptions() {
    getCompulsoryActions().clear();
    getOptionalActions().clear();

    if (getEntity() != null) {
      storage_pool dataCenter = null;
      if (getEntity().getstorage_pool_id() != null) {
        dataCenter = DataProvider.GetDataCenterById(getEntity().getstorage_pool_id().getValue());
      }
      if (dataCenter == null || dataCenter.getstorage_pool_type() != StorageType.LOCALFS) {
        // Add host action.
        UICommand addHostAction = new UICommand("AddHost", this);

        // 				var hosts = DataProvider.GetHostListByCluster(Entity.name)
        // 					.Skip(1)
        // 					.ToList();
        java.util.ArrayList<VDS> hosts = DataProvider.GetHostListByCluster(getEntity().getname());
        if (hosts.size() > 1) {
          hosts.remove(0);
        }

        if (hosts.isEmpty()) {
          addHostAction.setTitle(ClusterConfigureHostsAction);
          getCompulsoryActions().add(addHostAction);
        } else {
          addHostAction.setTitle(ClusterAddAnotherHostAction);
          getOptionalActions().add(addHostAction);
        }
        if (getEntity().getstorage_pool_id() == null) {
          addHostAction.setIsExecutionAllowed(false);
          addHostAction
              .getExecuteProhibitionReasons()
              .add("The Cluster isn't attached to a Data Center");
          return;
        }
        java.util.ArrayList<VDSGroup> clusters =
            DataProvider.GetClusterList((Guid) getEntity().getstorage_pool_id());
        Version minimalClusterVersion = Linq.GetMinVersionByClusters(clusters);
        java.util.ArrayList<VDS> availableHosts = new java.util.ArrayList<VDS>();
        for (VDS vds : DataProvider.GetHostList()) {
          if ((!Linq.IsHostBelongsToAnyOfClusters(clusters, vds))
              && (vds.getstatus() == VDSStatus.Maintenance
                  || vds.getstatus() == VDSStatus.PendingApproval)
              && (vds.getVersion().getFullVersion() == null
                  || Extensions.GetFriendlyVersion(vds.getVersion().getFullVersion())
                          .compareTo(minimalClusterVersion)
                      >= 0)) {
            availableHosts.add(vds);
          }
        }
        // Select host action.
        UICommand selectHostAction = new UICommand("SelectHost", this);

        if (availableHosts.size() > 0 && clusters.size() > 0) {
          if (hosts.isEmpty()) {
            selectHostAction.setTitle(SelectHostsAction);
            getCompulsoryActions().add(selectHostAction);
          } else {
            selectHostAction.setTitle(SelectHostsAction);
            getOptionalActions().add(selectHostAction);
          }
        }
      } else {
        UICommand tempVar = new UICommand("AddHost", this);
        tempVar.setTitle(ClusterAddAnotherHostAction);
        UICommand addHostAction = tempVar;
        UICommand tempVar2 = new UICommand("SelectHost", this);
        tempVar2.setTitle(SelectHostsAction);
        UICommand selectHost = tempVar2;
        VDS host = DataProvider.GetLocalStorageHost(dataCenter.getname());
        if (host != null) {
          addHostAction.setIsExecutionAllowed(false);
          selectHost.setIsExecutionAllowed(false);
          String hasHostReason =
              "This Cluster belongs to a Local Data Center which already contain a Host";
          addHostAction.getExecuteProhibitionReasons().add(hasHostReason);
          selectHost.getExecuteProhibitionReasons().add(hasHostReason);
        }
        getCompulsoryActions().add(addHostAction);
        getOptionalActions().add(selectHost);
      }
    }
  }
  public void OnAddHost() {
    CancelConfirm();

    HostModel model = (HostModel) getWindow();

    if (model.getProgress() != null) {
      return;
    }

    if (!model.Validate()) {
      return;
    }

    // Save changes.
    VDS host = new VDS();
    host.setvds_name((String) model.getName().getEntity());
    host.sethost_name((String) model.getHost().getEntity());
    host.setManagmentIp((String) model.getManagementIp().getEntity());
    host.setport((Integer) model.getPort().getEntity());
    host.setvds_group_id(((VDSGroup) model.getCluster().getSelectedItem()).getId());
    host.setpm_enabled((Boolean) model.getIsPm().getEntity());
    host.setpm_user(
        (Boolean) model.getIsPm().getEntity() ? (String) model.getPmUserName().getEntity() : null);
    host.setpm_password(
        (Boolean) model.getIsPm().getEntity() ? (String) model.getPmPassword().getEntity() : null);
    host.setpm_type(
        (Boolean) model.getIsPm().getEntity()
            ? (String) model.getPmType().getSelectedItem()
            : null);
    host.setPmOptionsMap(
        (Boolean) model.getIsPm().getEntity()
            ? new ValueObjectMap(model.getPmOptionsMap(), false)
            : null);

    AddVdsActionParameters vdsActionParams = new AddVdsActionParameters();
    vdsActionParams.setvds(host);
    vdsActionParams.setVdsId(host.getId());
    vdsActionParams.setRootPassword((String) model.getRootPassword().getEntity());

    model.StartProgress(null);

    Frontend.RunAction(
        VdcActionType.AddVds,
        vdsActionParams,
        new IFrontendActionAsyncCallback() {
          @Override
          public void Executed(FrontendActionAsyncResult result) {

            ClusterGuideModel localModel = (ClusterGuideModel) result.getState();
            localModel.PostOnAddHost(result.getReturnValue());
          }
        },
        this);
  }