public boolean eventOccurred(UISWTViewEvent event) {
    if (listener == null) {
      UISWTViewEventListener eventListener = null;

      synchronized (UISWTViewEventListenerHolder.this) {
        int type = event.getType();
        if (type == UISWTViewEvent.TYPE_CREATE) {
          try {
            eventListener = cla.newInstance();
            UISWTView view = event.getView();
            if (eventListener instanceof UISWTViewCoreEventListener) {
              if (view instanceof UISWTViewCore) {
                UISWTViewCore coreView = (UISWTViewCore) view;
                coreView.setUseCoreDataSource(true);
              }
            }
            if (mapSWTViewToEventListener == null) {
              mapSWTViewToEventListener = new HashMap<UISWTView, UISWTViewEventListener>();
            }
            mapSWTViewToEventListener.put(view, eventListener);

            if (datasource != null) {
              if (view instanceof UISWTViewImpl) {
                UISWTViewImpl swtView = (UISWTViewImpl) view;
                swtView.triggerEventRaw(
                    UISWTViewEvent.TYPE_DATASOURCE_CHANGED,
                    PluginCoreUtils.convert(
                        datasource, ((UISWTViewImpl) view).useCoreDataSource()));
              } else {
                view.triggerEvent(UISWTViewEvent.TYPE_DATASOURCE_CHANGED, datasource);
              }
            }
          } catch (Exception e) {
            Debug.out(e);
            return false;
          }
        } else if (mapSWTViewToEventListener != null) {
          if (type == UISWTViewEvent.TYPE_DESTROY) {
            eventListener = mapSWTViewToEventListener.remove(event.getView());
          } else {
            eventListener = mapSWTViewToEventListener.get(event.getView());
          }
        }
      }

      if (eventListener == null) {
        return false;
      }

      return eventListener.eventOccurred(event);
    } else if (event.getType() == UISWTViewEvent.TYPE_CREATE
        && (listener instanceof UISWTViewCoreEventListener)) {
      if (event.getView() instanceof UISWTViewCore) {
        UISWTViewCore coreView = (UISWTViewCore) event.getView();
        coreView.setUseCoreDataSource(true);
      }
    }

    return (listener.eventOccurred(event));
  }
  public void triggerTabViewsDataSourceChanged(boolean sendParent) {
    if (tabViews == null || tabViews.size() == 0) {
      return;
    }

    if (sendParent) {
      for (int i = 0; i < tabViews.size(); i++) {
        UISWTViewCore view = tabViews.get(i);
        if (view != null) {
          view.triggerEvent(UISWTViewEvent.TYPE_DATASOURCE_CHANGED, tv.getParentDataSource());
        }
      }
      return;
    }

    // Set Data Object for all tabs.

    Object[] dataSourcesCore = tv.getSelectedDataSources(true);
    Object[] dataSourcesPlugin = null;

    for (int i = 0; i < tabViews.size(); i++) {
      UISWTViewCore view = tabViews.get(i);
      if (view != null) {
        if (view.useCoreDataSource()) {
          view.triggerEvent(
              UISWTViewEvent.TYPE_DATASOURCE_CHANGED,
              dataSourcesCore.length == 0 ? tv.getParentDataSource() : dataSourcesCore);
        } else {
          if (dataSourcesPlugin == null) {
            dataSourcesPlugin = tv.getSelectedDataSources(false);
          }

          view.triggerEvent(
              UISWTViewEvent.TYPE_DATASOURCE_CHANGED,
              dataSourcesPlugin.length == 0
                  ? PluginCoreUtils.convert(tv.getParentDataSource(), false)
                  : dataSourcesPlugin);
        }
      }
    }
  }
  public void triggerTabViewDataSourceChanged(UISWTViewCore view) {
    if (view != null) {
      view.triggerEvent(UISWTViewEvent.TYPE_DATASOURCE_CHANGED, tv.getParentDataSource());

      if (view.useCoreDataSource()) {
        Object[] dataSourcesCore = tv.getSelectedDataSources(true);
        if (dataSourcesCore.length > 0) {
          view.triggerEvent(
              UISWTViewEvent.TYPE_DATASOURCE_CHANGED,
              dataSourcesCore.length == 0 ? tv.getParentDataSource() : dataSourcesCore);
        }
      } else {
        Object[] dataSourcesPlugin = tv.getSelectedDataSources(false);
        if (dataSourcesPlugin.length > 0) {
          view.triggerEvent(
              UISWTViewEvent.TYPE_DATASOURCE_CHANGED,
              dataSourcesPlugin.length == 0
                  ? PluginCoreUtils.convert(tv.getParentDataSource(), false)
                  : dataSourcesPlugin);
        }
      }
    }
  }