Vaadin 7 hierarchical container and TreeComponent example with Liferay OrganizationService

private void buildMainLayout() throws SystemException, PortalException {
  if (viewContent.getComponentCount() > 0) {
      viewContent.removeAllComponents();
  }

  viewContent.setMargin(true);
  viewContent.addStyleName("view");

  List orgList = new ArrayList();
  orgList = OrganizationLocalServiceUtil.getUserOrganizations(user.getUserId());
  final HierarchicalContainer container = createTreeContent(orgList);

  tree = new Tree("My Organizations", container);
  tree.addStyleName("checkboxed");
  tree.setSelectable(false);
  tree.setItemCaptionMode(ItemCaptionMode.PROPERTY);
  tree.setItemCaptionPropertyId("name");
  tree.addItemClickListener(new ItemClickEvent.ItemClickListener() {
    public void itemClick(ItemClickEvent event) {
      if (event.getItemId().getClass() == Long.class) {
        long itemId = (Long) event.getItemId();
        if (checked.contains(itemId)) {
          checkboxChildren(container, itemId, false);
        }
        else {
          checkboxChildren(container, itemId, true);
          tree.expandItemsRecursively(itemId);
        }
      }
      tree.markAsDirty();
    }
  });

  Tree.ItemStyleGenerator itemStyleGenerator = new Tree.ItemStyleGenerator() {
    @Override
    public String getStyle(Tree source, Object itemId) {
      if (checked.contains(itemId))
        return "checked";
      else
        return "unchecked";
    }
  };
  tree.setItemStyleGenerator(itemStyleGenerator);

  viewContent.addComponent(tree);
  viewContent.setVisible(true);
  setContent(viewContent);
}

public void checkboxChildren(HierarchicalContainer hc, long itemId, boolean bAdd) {
  try {
    if (bAdd) {
      checked.add(itemId);
    }
    else {
      checked.remove(itemId);
      Object iParendId = hc.getParent(itemId);
      while (iParendId != null) {
        checked.remove(iParendId);
        iParendId = hc.getParent(iParendId);
      }
    }

    if (hc.hasChildren(itemId)) {
      Collection children = hc.getChildren(itemId);
      for (Object o : children) {
        if (o.getClass() == Long.class) {
          itemId = (Long) o;
          checkboxChildren(hc, itemId, bAdd);
        }
      }
    }
  }
  catch (Exception e) {
      Notification.show("Unable to build Organization tree.  Contact Administrator.", Type.ERROR_MESSAGE);
  }
}

public static HierarchicalContainer createTreeContent(List oTrees)
    throws SystemException, PortalException {

  HierarchicalContainer container = new HierarchicalContainer();
  container.addContainerProperty("name", String.class, "");

  new Object() {
    @SuppressWarnings("unchecked")
    public void put(List data, HierarchicalContainer container)
        throws SystemException, PortalException {

      for (Organization o : data) {
        long orgId = o.getOrganizationId();

        if (!container.containsId(orgId)) {
          container.addItem(orgId);
          container.getItem(orgId).getItemProperty("name").setValue(o.getName());

          if (!o.hasSuborganizations()) {
            container.setChildrenAllowed(orgId, false);
          }
          else {
            container.setChildrenAllowed(orgId, true);
          }

          if (o.isRoot()) {
            container.setParent(orgId, null);
          }
          else {
            if (!container.containsId(o.getParentOrganizationId())) {
              List sub = new ArrayList();
              sub.add(o.getParentOrganization());
              put(sub, container);
            }
            container.setParent(orgId, (Object) o.getParentOrganizationId());
          }
        }
      }
    }
  }.put(oTrees, container);

  return container;
}

.v-tree-node-caption-disabled {
  color: black;
  font-style: italic;
  //border-style:solid;
  //border-width:1px;
}

.v-tree-checkboxed .v-tree-node-caption-unchecked div span {
  background: url("images/unchecked.png") no-repeat;
  padding-left: 24px;
  //border-style:solid;
  //border-width:1px;
}

.v-tree-checkboxed .v-tree-node-caption-checked div span {
  background: url("images/checked.png") no-repeat;
  padding-left: 24px;
  //border-style:solid;
  //border-width:1px;
}