protected final void loadChildren(DynamicNode node) throws DbException {
    if (node.hasLoaded() || node.isLeaf()) return;
    node.setHasLoaded();
    Object userObject = node.getUserObject();
    if (userObject == ROOT) return;
    SrVector children = new SrVector(10);
    boolean isSorted = true;
    DbObject dbParent = null;
    if (userObject == DB_RAM) {
      Db[] dbs = Db.getDbs();
      for (int i = 0; i < dbs.length; i++) {
        if (dbs[i] instanceof DbRAM) insertProjects(children, dbs[i]);
      }
    } else if (userObject instanceof Db) {
      insertProjects(children, (Db) userObject);
    } else {
      dbParent = (DbObject) userObject;
      dbParent.getDb().beginTrans(Db.READ_TRANS);
      insertComponents(children, dbParent);
      isSorted = childrenAreSorted(dbParent);
      dbParent.getDb().commitTrans();
    }

    if (isSorted) {
      children.sort(getComparator(dbParent));
    }

    ArrayList groupNodeList = new ArrayList();
    DynamicNode groupNode = null;
    Enumeration enumeration = children.elements();
    while (enumeration.hasMoreElements()) {
      DynamicNode childNode = (DynamicNode) enumeration.nextElement();
      GroupParams group = childNode.getGroupParams();
      if (group.name == null) {
        node.add(childNode);
      } else {
        if (groupNode == null) {
          groupNode = createGroupNode(group);
          node.add(groupNode);
          groupNodeList.add(groupNode);
        } else if (!groupNode.toString().equals(group.name)) {
          boolean groupFound = false;
          for (int i = 0; i < groupNodeList.size(); i++) {
            groupNode = (DynamicNode) groupNodeList.get(i);
            if (groupNode.toString().equals(group.name)) {
              groupFound = true;
              break;
            }
          }
          if (!groupFound) {
            groupNode = createGroupNode(group);
            node.add(groupNode);
            groupNodeList.add(groupNode);
          }
        }
        groupNode.add(childNode);
      }
    }
    groupNodeList.clear();
  }
 // Called at the end of a cell edition, to process the edition result.
 public final void valueForPathChanged(TreePath path, Object newValue) {
   DynamicNode node = (DynamicNode) path.getLastPathComponent();
   Object obj = node.getRealObject();
   if (obj instanceof DbObject) {
     boolean editable = false;
     try {
       Db db = ((DbObject) obj).getDb();
       if (db.isValid()) {
         db.beginReadTrans();
         MetaField editableMetaField = getEditableMetaField((DbObject) obj);
         if (editableMetaField == null)
           editable =
               ApplicationContext.getSemanticalModel()
                   .isNameEditable((DbObject) obj, Explorer.class);
         else
           editable =
               ApplicationContext.getSemanticalModel()
                   .isEditable(editableMetaField, (DbObject) obj, Explorer.class);
         db.commitTrans();
       }
     } catch (DbException ex) {
       org.modelsphere.jack.util.ExceptionHandler.processUncatchedException(
           ApplicationContext.getDefaultMainFrame(), ex);
       editable = false;
     }
     if (!editable) return;
   } else {
     return;
   }
   DbObject semObj = (DbObject) obj;
   try {
     MetaField editableMetaField = getEditableMetaField(semObj);
     String transName =
         (editableMetaField == null
             ? LocaleMgr.action.getString("rename")
             : MessageFormat.format(kUpdate0, new Object[] {editableMetaField.getGUIName()}));
     semObj.getDb().beginTrans(Db.WRITE_TRANS, transName);
     if (editableMetaField == null) {
       if (semObj.getTransStatus() == Db.OBJ_REMOVED) return;
       semObj.setName((String) newValue);
     } else semObj.set(editableMetaField, (String) newValue);
     semObj.getDb().commitTrans();
     nodeChanged(node); // in case it is a secondary node (only the
     // primary node is updated by the refresh
     // listener).
   } catch (Exception ex) {
     org.modelsphere.jack.util.ExceptionHandler.processUncatchedException(
         ApplicationContext.getDefaultMainFrame(), ex);
   }
 }
  protected final void doActionPerformed(ActionEvent evt) {
    try {
      ApplicationDiagram diag =
          (ApplicationDiagram) (ApplicationContext.getFocusManager().getFocusObject());
      Point clickPosition = getDiagramLocation(evt);
      if (clickPosition == null)
        clickPosition = GraphicUtil.rectangleGetCenter(diag.getMainView().getViewRect());
      java.awt.Image image = SRSystemClipboard.getClipboardImage();
      if (image == null) return;
      DbObject diagGo = diag.getDiagramGO();
      Db db = diagGo.getDb();

      ImageIcon icon = new ImageIcon(image);
      int imageHeigth = icon.getIconHeight();
      int imageWidth = icon.getIconWidth();

      db.beginTrans(Db.WRITE_TRANS, LocaleMgr.action.getString("pasteDiagramImage"));

      DbObject imageGo = diagGo.createComponent(DbGraphic.fImageGoDiagramImage.getMetaClass());
      imageGo.set(DbGraphic.fImageGoDiagramImage, image);
      imageGo.set(
          DbGraphic.fGraphicalObjectRectangle,
          new Rectangle(
              clickPosition.x - (imageWidth / 2),
              clickPosition.y - (imageHeigth / 2),
              imageWidth,
              imageHeigth));
      db.commitTrans();
    } catch (Exception e) {
      org.modelsphere.jack.util.ExceptionHandler.processUncatchedException(
          ApplicationContext.getDefaultMainFrame(), e);
    }
  }
  public final DynamicNode getDynamicNode(DbObject dbo, int which, boolean load)
      throws DbException {
    SrVector path = new SrVector(10);
    Db db = dbo.getDb();
    db.beginTrans(Db.READ_TRANS);
    while (dbo != null && !(dbo instanceof DbRoot)) {
      path.addElement(dbo);
      dbo = getDbParent(dbo, which);
    }
    if (db instanceof DbRAM) {
      if (DB_RAM != ((DynamicNode) getRoot()).getUserObject()) path.addElement(DB_RAM);
    } else path.addElement(db);

    DynamicNode nodeFound = (DynamicNode) getRoot();
    for (int i = path.size(); --i >= 0; ) {
      if (load) loadChildren(nodeFound);
      Object userObj = path.elementAt(i);
      dbo = null;
      DbObject dbParent = null;
      GroupParams group = GroupParams.defaultGroupParams;
      DynamicNode groupNode = null;
      DynamicNode node = null;
      if (userObj instanceof DbObject) {
        dbo = (DbObject) userObj;
        dbParent = getDbParent(dbo, which);
        group = getGroupParams(dbParent, dbo);
      }
      if (group.name == null) {
        node = getDynamicNode(nodeFound, userObj, 0);
      } else {
        groupNode = getGroupNode(nodeFound, group, 0);
        if (groupNode != null) node = getDynamicNode(groupNode, userObj, 0);
      }
      if (node == null && nodeFound.hasLoaded() && !nodeFound.isLeaf() && which == Db.NEW_VALUE) {

        SemanticalModel model = ApplicationContext.getSemanticalModel();
        boolean visible = model.isVisibleOnScreen(dbParent, dbo, Explorer.class);

        if (visible) {
          node = createPrimaryNode(dbParent, dbo);
          if (group.name == null) {
            insertNodeInto(node, nodeFound, getInsertionIndex(dbParent, dbo, nodeFound, node));
          } else {
            if (groupNode == null) {
              groupNode = createGroupNode(group);
              insertNodeInto(groupNode, nodeFound, getSortedIndex(nodeFound, groupNode));
            }
            insertNodeInto(node, groupNode, getInsertionIndex(dbParent, dbo, groupNode, node));
          }
        }
      }
      nodeFound = node;
      if (nodeFound == null) break;
    }
    db.commitTrans();
    return nodeFound;
  }