private SessionDataDto defineCurrentSession(CellDoubleClickEvent event) {
   String sessionId =
       treeGrid.getColumnModel().getColumn(event.getCellIndex()).getHeader().asString();
   String sessionData_id = sessionId.substring(sessionId.indexOf(' ') + 1);
   SessionDataDto currentSession = null;
   for (SessionDataDto sessionDataDto : SessionComparisonPanel.this.chosenSessions) {
     if (sessionDataDto.getSessionId().equals(sessionData_id)) {
       currentSession = sessionDataDto;
       break;
     }
   }
   return currentSession;
 }
  public void addTestInfo(TaskDataDto test, Map<String, TestInfoDto> testInfoMap) {

    TreeItem testItem = getTestItem(test);

    String testInfoId = testItem.getKey() + TEST_INFO;
    if (treeStore.findModelWithKey(testInfoId) != null) {
      return;
    }

    String testItemName = getTestItemName(test);
    TreeItem testInfo = new TreeItem(testInfoId);
    testInfo.put(NAME, TEST_INFO);
    testInfo.put(TEST_DESCRIPTION, test.getDescription());
    testInfo.put(TEST_NAME, testItemName);
    treeStore.insert(testItem, 0, testInfo);

    TreeItem clock = new TreeItem(testItem.getKey() + "Clock");
    clock.put(NAME, "Clock");
    clock.put(TEST_DESCRIPTION, test.getDescription());
    clock.put(TEST_NAME, testItemName);
    clock.put(TEST_INFO, TEST_INFO);
    for (SessionDataDto session : chosenSessions) {
      if (testInfoMap.get(session.getSessionId()) != null)
        clock.put(
            SESSION_HEADER + session.getSessionId(),
            testInfoMap.get(session.getSessionId()).getClock());
    }
    treeStore.add(testInfo, clock);

    TreeItem termination = new TreeItem(testItem.getKey() + "Termination");
    termination.put(NAME, "Termination");
    termination.put(TEST_DESCRIPTION, test.getDescription());
    termination.put(TEST_NAME, testItemName);
    termination.put(TEST_INFO, TEST_INFO);
    for (SessionDataDto session : chosenSessions) {
      if (testInfoMap.get(session.getSessionId()) != null)
        termination.put(
            SESSION_HEADER + session.getSessionId(),
            testInfoMap.get(session.getSessionId()).getTermination());
    }
    treeStore.add(testInfo, termination);

    TreeItem startTime = new TreeItem(testItem.getKey() + "Start time");
    startTime.put(NAME, "Start time");
    startTime.put(TEST_DESCRIPTION, test.getDescription());
    startTime.put(TEST_NAME, testItemName);
    startTime.put(TEST_INFO, TEST_INFO);
    for (SessionDataDto session : chosenSessions) {
      if (testInfoMap.get(session.getSessionId()) != null) {
        Date date = testInfoMap.get(session.getSessionId()).getStartTime();
        startTime.put(SESSION_HEADER + session.getSessionId(), dateFormatter.format(date));
      }
    }
    treeStore.add(testInfo, startTime);
  }
  public void addSessionInfo() {
    TreeItem sessionInfo = new TreeItem(SESSION_INFO_ID);
    sessionInfo.put(NAME, "Session Info");
    treeStore.insert(0, sessionInfo);

    String tagsStr = "";
    TreeItem itemActiveKernels = new TreeItem(ACTIVE_KERNELS);
    TreeItem itemTaskExecuted = new TreeItem(TASKS_EXECUTED);
    TreeItem itemTaskFailed = new TreeItem(TASKS_FAILED);
    TreeItem itemDateStart = new TreeItem(START_DATE);
    TreeItem itemDateEnd = new TreeItem(END_DATE);
    TreeItem itemComment = new TreeItem(COMMENT);
    TreeItem itemUserComment = new TreeItem(USER_COMMENT);
    TreeItem itemTags = new TreeItem(SESSION_TAGS);

    itemActiveKernels.put(NAME, ACTIVE_KERNELS);
    itemTaskExecuted.put(NAME, TASKS_EXECUTED);
    itemTaskFailed.put(NAME, TASKS_FAILED);
    itemDateStart.put(NAME, START_DATE);
    itemDateEnd.put(NAME, END_DATE);
    itemComment.put(NAME, COMMENT);
    if (webClientProperties.isUserCommentStoreAvailable()) itemUserComment.put(NAME, USER_COMMENT);
    if (webClientProperties.isTagsStoreAvailable()) itemTags.put(NAME, SESSION_TAGS);

    for (SessionDataDto session : chosenSessions) {
      itemActiveKernels.put(
          SESSION_HEADER + session.getSessionId(), session.getActiveKernelsCount() + "");
      itemTaskExecuted.put(
          SESSION_HEADER + session.getSessionId(), session.getTasksExecuted() + "");
      itemTaskFailed.put(SESSION_HEADER + session.getSessionId(), session.getTasksFailed() + "");
      itemDateStart.put(
          SESSION_HEADER + session.getSessionId(), dateFormatter.format(session.getStartDate()));
      itemDateEnd.put(
          SESSION_HEADER + session.getSessionId(), dateFormatter.format(session.getEndDate()));
      itemComment.put(SESSION_HEADER + session.getSessionId(), session.getComment());
      if (webClientProperties.isUserCommentStoreAvailable()) {
        String userComment = session.getUserComment() == null ? "" : session.getUserComment();
        itemUserComment.put(SESSION_HEADER + session.getSessionId(), userComment);
      }
      if (webClientProperties.isTagsStoreAvailable()) {
        for (int i = 0; i < session.getTags().size(); i++) {
          if (i == session.getTags().size() - 1) tagsStr += session.getTags().get(i).getName();
          else tagsStr += session.getTags().get(i).getName() + ", ";
        }
        itemTags.put(SESSION_HEADER + session.getSessionId(), tagsStr);
        tagsStr = "";
      }
    }
    treeStore.add(sessionInfo, itemComment);
    if (webClientProperties.isUserCommentStoreAvailable())
      treeStore.add(sessionInfo, itemUserComment);
    if (webClientProperties.isTagsStoreAvailable()) treeStore.add(sessionInfo, itemTags);
    treeStore.add(sessionInfo, itemDateStart);
    treeStore.add(sessionInfo, itemDateEnd);

    treeStore.add(sessionInfo, itemActiveKernels);
    treeStore.add(sessionInfo, itemTaskExecuted);
    treeStore.add(sessionInfo, itemTaskFailed);
  }
  private void init(Set<SessionDataDto> chosenSessions, int width) {

    int colWidth = calculateWidth(chosenSessions.size(), width);

    treeStore.clear();
    List<ColumnConfig<TreeItem, ?>> columns = new ArrayList<ColumnConfig<TreeItem, ?>>();

    // sort sessions by number sessionId
    SortedSet<SessionDataDto> sortedSet =
        new TreeSet<SessionDataDto>(
            new Comparator<SessionDataDto>() {
              @Override
              public int compare(SessionDataDto o, SessionDataDto o2) {
                return (Long.parseLong(o.getSessionId()) - Long.parseLong(o2.getSessionId())) > 0
                    ? 1
                    : -1;
              }
            });
    sortedSet.addAll(chosenSessions);

    ColumnConfig<TreeItem, String> nameColumn =
        new ColumnConfig<TreeItem, String>(
            new MapValueProvider(NAME), (int) (colWidth * METRIC_COLUMN_WIDTH_FACTOR));
    nameColumn.setHeader(METRIC);
    nameColumn.setSortable(false);
    nameColumn.setMenuDisabled(true);
    columns.add(nameColumn);

    for (SessionDataDto session : sortedSet) {
      ColumnConfig<TreeItem, String> column =
          new ColumnConfig<TreeItem, String>(
              new MapValueProvider(SESSION_HEADER + session.getSessionId()));
      column.setHeader(SESSION_HEADER + session.getSessionId());
      column.setWidth(colWidth);
      column.setSortable(false);
      column.setCell(
          new AbstractCell<String>() {
            @Override
            public void render(Context context, String value, SafeHtmlBuilder sb) {
              if (value != null) {
                sb.appendHtmlConstant(value);
              }
            }
          });
      column.setMenuDisabled(true);

      column.setColumnTextStyle(
          new SafeStyles() {
            @Override
            public String asString() {
              return WHITE_SPACE_NORMAL;
            }
          });

      columns.add(column);
    }

    ColumnModel<TreeItem> cm = new ColumnModel<TreeItem>(columns);

    treeGrid = new NoIconsTreeGrid(treeStore, cm, nameColumn);

    treeGrid.addBeforeCollapseHandler(
        new BeforeCollapseItemEvent.BeforeCollapseItemHandler<TreeItem>() {
          @Override
          public void onBeforeCollapse(BeforeCollapseItemEvent<TreeItem> event) {
            event.setCancelled(true);
          }
        });

    treeGrid.setAutoExpand(true);
    treeGrid.getView().setStripeRows(true);
    treeGrid.setMinColumnWidth(MIN_COLUMN_WIDTH);
    treeGrid.setAllowTextSelection(true);
    treeGrid.getView().setForceFit(true);

    treeStore.addStoreAddHandler(
        new StoreAddEvent.StoreAddHandler<TreeItem>() {
          @Override
          public void onAdd(StoreAddEvent<TreeItem> event) {
            for (TreeItem item : event.getItems()) {
              treeGrid.setExpanded(item, true);
            }
          }
        });

    if (webClientProperties.isUserCommentEditAvailable()) {
      treeGrid.addCellDoubleClickHandler(
          new CellDoubleClickEvent.CellDoubleClickHandler() {
            @Override
            public void onCellClick(CellDoubleClickEvent event) {
              TreeItem item =
                  treeGrid.findNode(treeGrid.getTreeView().getRow(event.getRowIndex())).getModel();
              if (item.getKey().equals(USER_COMMENT) && event.getCellIndex() > 0) {
                SessionDataDto currentSession = defineCurrentSession(event);
                userCommentBox.popUp(
                    currentSession, item.get(SESSION_HEADER + currentSession.getSessionId()), item);
              }
            }
          });
    }

    if (webClientProperties.isTagsAvailable()) {
      treeGrid.addCellDoubleClickHandler(
          new CellDoubleClickEvent.CellDoubleClickHandler() {
            @Override
            public void onCellClick(CellDoubleClickEvent event) {
              TreeItem item =
                  treeGrid.findNode(treeGrid.getTreeView().getRow(event.getRowIndex())).getModel();
              if (item.getKey().equals(SESSION_TAGS) && event.getCellIndex() > 0) {
                SessionDataDto currentSession = defineCurrentSession(event);
                if (allTagsLoadComplete) tagBox.popUpForEdit(currentSession, item, allTags);
              }
            }
          });
    }

    add(treeGrid);
  }