/** @generated */
 @SuppressWarnings("rawtypes")
 protected List getSemanticChildrenList() {
   View viewObject = (View) getHost().getModel();
   LinkedList<EObject> result = new LinkedList<EObject>();
   List<
           edu.toronto.cs.se.modelepedia.relationaldatabase_mavo.diagram.part
               .RelationalDatabase_MAVONodeDescriptor>
       childDescriptors =
           edu.toronto.cs.se.modelepedia.relationaldatabase_mavo.diagram.part
               .RelationalDatabase_MAVODiagramUpdater.getRelationalDatabase_1000SemanticChildren(
               viewObject);
   for (edu.toronto.cs.se.modelepedia.relationaldatabase_mavo.diagram.part
           .RelationalDatabase_MAVONodeDescriptor
       d : childDescriptors) {
     result.add(d.getModelElement());
   }
   return result;
 }
  /** @generated */
  protected void refreshSemantic() {
    if (resolveSemanticElement() == null) {
      return;
    }
    LinkedList<IAdaptable> createdViews = new LinkedList<IAdaptable>();
    List<
            edu.toronto.cs.se.modelepedia.relationaldatabase_mavo.diagram.part
                .RelationalDatabase_MAVONodeDescriptor>
        childDescriptors =
            edu.toronto.cs.se.modelepedia.relationaldatabase_mavo.diagram.part
                .RelationalDatabase_MAVODiagramUpdater.getRelationalDatabase_1000SemanticChildren(
                (View) getHost().getModel());
    LinkedList<View> orphaned = new LinkedList<View>();
    // we care to check only views we recognize as ours and not shortcuts
    LinkedList<View> knownViewChildren = new LinkedList<View>();
    for (View v : getViewChildren()) {
      if (isShortcut(v)) {
        if (edu.toronto.cs.se.modelepedia.relationaldatabase_mavo.diagram.part
            .RelationalDatabase_MAVODiagramUpdater.isShortcutOrphaned(v)) {
          orphaned.add(v);
        }
        continue;
      }
      if (isMyDiagramElement(v)) {
        knownViewChildren.add(v);
      }
    }
    // alternative to #cleanCanonicalSemanticChildren(getViewChildren(), semanticChildren)
    //
    // iteration happens over list of desired semantic elements, trying to find best matching View,
    // while original CEP
    // iterates views, potentially losing view (size/bounds) information - i.e. if there are few
    // views to reference same EObject, only last one
    // to answer isOrphaned == true will be used for the domain element representation, see
    // #cleanCanonicalSemanticChildren()
    for (Iterator<
                edu.toronto.cs.se.modelepedia.relationaldatabase_mavo.diagram.part
                    .RelationalDatabase_MAVONodeDescriptor>
            descriptorsIterator = childDescriptors.iterator();
        descriptorsIterator.hasNext(); ) {
      edu.toronto.cs.se.modelepedia.relationaldatabase_mavo.diagram.part
              .RelationalDatabase_MAVONodeDescriptor
          next = descriptorsIterator.next();
      String hint =
          edu.toronto.cs.se.modelepedia.relationaldatabase_mavo.diagram.part
              .RelationalDatabase_MAVOVisualIDRegistry.getType(next.getVisualID());
      LinkedList<View> perfectMatch =
          new LinkedList<View>(); // both semanticElement and hint match that of NodeDescriptor
      for (View childView : getViewChildren()) {
        EObject semanticElement = childView.getElement();
        if (next.getModelElement().equals(semanticElement)) {
          if (hint.equals(childView.getType())) {
            perfectMatch.add(childView);
            // actually, can stop iteration over view children here, but
            // may want to use not the first view but last one as a 'real' match (the way original
            // CEP does
            // with its trick with viewToSemanticMap inside #cleanCanonicalSemanticChildren
          }
        }
      }
      if (perfectMatch.size() > 0) {
        descriptorsIterator
            .remove(); // precise match found no need to create anything for the NodeDescriptor
        // use only one view (first or last?), keep rest as orphaned for further consideration
        knownViewChildren.remove(perfectMatch.getFirst());
      }
    }
    // those left in knownViewChildren are subject to removal - they are our diagram elements we
    // didn't find match to,
    // or those we have potential matches to, and thus need to be recreated, preserving
    // size/location information.
    orphaned.addAll(knownViewChildren);
    //
    ArrayList<CreateViewRequest.ViewDescriptor> viewDescriptors =
        new ArrayList<CreateViewRequest.ViewDescriptor>(childDescriptors.size());
    for (edu.toronto.cs.se.modelepedia.relationaldatabase_mavo.diagram.part
            .RelationalDatabase_MAVONodeDescriptor
        next : childDescriptors) {
      String hint =
          edu.toronto.cs.se.modelepedia.relationaldatabase_mavo.diagram.part
              .RelationalDatabase_MAVOVisualIDRegistry.getType(next.getVisualID());
      IAdaptable elementAdapter = new CanonicalElementAdapter(next.getModelElement(), hint);
      CreateViewRequest.ViewDescriptor descriptor =
          new CreateViewRequest.ViewDescriptor(
              elementAdapter,
              Node.class,
              hint,
              ViewUtil.APPEND,
              false,
              host().getDiagramPreferencesHint());
      viewDescriptors.add(descriptor);
    }

    boolean changed = deleteViews(orphaned.iterator());
    //
    CreateViewRequest request = getCreateViewRequest(viewDescriptors);
    Command cmd = getCreateViewCommand(request);
    if (cmd != null && cmd.canExecute()) {
      SetViewMutabilityCommand.makeMutable(new EObjectAdapter(host().getNotationView())).execute();
      executeCommand(cmd);
      @SuppressWarnings("unchecked")
      List<IAdaptable> nl = (List<IAdaptable>) request.getNewObject();
      createdViews.addAll(nl);
    }
    if (changed || createdViews.size() > 0) {
      postProcessRefreshSemantic(createdViews);
    }

    Collection<IAdaptable> createdConnectionViews = refreshConnections();

    if (createdViews.size() > 1) {
      // perform a layout of the container
      DeferredLayoutCommand layoutCmd =
          new DeferredLayoutCommand(host().getEditingDomain(), createdViews, host());
      executeCommand(new ICommandProxy(layoutCmd));
    }

    createdViews.addAll(createdConnectionViews);

    makeViewsImmutable(createdViews);
  }