@Nullable
  public Object getData(String dataId) {

    if (CommonDataKeys.PROJECT.is(dataId)) {
      return editor != null ? editor.getProject() : null;
    } else if (CommonDataKeys.VIRTUAL_FILE.is(dataId)) {
      return editor != null ? editor.getFile() : null;
    } else if (CommonDataKeys.VIRTUAL_FILE_ARRAY.is(dataId)) {
      return editor != null ? new VirtualFile[] {editor.getFile()} : new VirtualFile[] {};
    } else if (CommonDataKeys.PSI_FILE.is(dataId)) {
      return getData(CommonDataKeys.PSI_ELEMENT.getName());
    } else if (CommonDataKeys.PSI_ELEMENT.is(dataId)) {
      VirtualFile file = editor != null ? editor.getFile() : null;
      return file != null && file.isValid()
          ? PsiManager.getInstance(editor.getProject()).findFile(file)
          : null;
    } else if (LangDataKeys.PSI_ELEMENT_ARRAY.is(dataId)) {
      return editor != null
          ? new PsiElement[] {(PsiElement) getData(CommonDataKeys.PSI_ELEMENT.getName())}
          : new PsiElement[] {};
    } else if (PlatformDataKeys.COPY_PROVIDER.is(dataId) && copyPasteSupport != null) {
      return this;
    } else if (PlatformDataKeys.CUT_PROVIDER.is(dataId) && copyPasteSupport != null) {
      return copyPasteSupport.getCutProvider();
    } else if (PlatformDataKeys.DELETE_ELEMENT_PROVIDER.is(dataId)) {
      return deleteProvider;
    } else if (ImageComponentDecorator.DATA_KEY.is(dataId)) {
      return editor != null ? editor : this;
    }

    return null;
  }
 @Nullable
 private static PsiElement getSelectedPsiElement(
     final DataContext dataContext, final Project project) {
   PsiElement element = null;
   final Editor editor = CommonDataKeys.EDITOR.getData(dataContext);
   if (editor != null) {
     final PsiFile psiFile =
         PsiDocumentManager.getInstance(project).getPsiFile(editor.getDocument());
     if (psiFile != null) {
       final int offset = editor.getCaretModel().getOffset();
       element = psiFile.findElementAt(offset);
       if (element == null && offset > 0 && offset == psiFile.getTextLength()) {
         element = psiFile.findElementAt(offset - 1);
       }
     }
   }
   if (element == null) {
     final PsiElement[] elements = LangDataKeys.PSI_ELEMENT_ARRAY.getData(dataContext);
     element = elements != null && elements.length > 0 ? elements[0] : null;
   }
   if (element == null) {
     final VirtualFile[] files = CommonDataKeys.VIRTUAL_FILE_ARRAY.getData(dataContext);
     if (files != null && files.length > 0) {
       element = PsiManager.getInstance(project).findFile(files[0]);
     }
   }
   return element;
 }
  @Override
  public Object getData(String dataId) {
    if (PlatformDataKeys.HELP_ID.is(dataId)) return HELP_ID;
    if (DATA_KEY.is(dataId)) return this;
    if (myTree == null) return null;
    TreePath[] paths = myTree.getSelectionPaths();

    if (paths == null || paths.length == 0) return null;

    if (paths.length > 1) {
      if (LangDataKeys.PSI_ELEMENT_ARRAY.is(dataId)) {
        return collectPsiElements();
      }
      return null;
    }

    TreePath path = paths[0];

    InspectionTreeNode selectedNode = (InspectionTreeNode) path.getLastPathComponent();

    if (selectedNode instanceof RefElementNode) {
      final RefElementNode refElementNode = (RefElementNode) selectedNode;
      RefEntity refElement = refElementNode.getElement();
      if (refElement == null) return null;
      final RefEntity item = refElement.getRefManager().getRefinedElement(refElement);

      if (!item.isValid()) return null;

      PsiElement psiElement = item instanceof RefElement ? ((RefElement) item).getElement() : null;
      if (psiElement == null) return null;

      final CommonProblemDescriptor problem = refElementNode.getProblem();
      if (problem != null) {
        if (problem instanceof ProblemDescriptor) {
          psiElement = ((ProblemDescriptor) problem).getPsiElement();
          if (psiElement == null) return null;
        } else {
          return null;
        }
      }

      if (CommonDataKeys.NAVIGATABLE.is(dataId)) {
        return getSelectedNavigatable(problem, psiElement);
      } else if (CommonDataKeys.PSI_ELEMENT.is(dataId)) {
        return psiElement.isValid() ? psiElement : null;
      }
    } else if (selectedNode instanceof ProblemDescriptionNode
        && CommonDataKeys.NAVIGATABLE.is(dataId)) {
      return getSelectedNavigatable(((ProblemDescriptionNode) selectedNode).getDescriptor());
    }

    return null;
  }
 @Nullable
 private static PsiElement[] getPsiElements(DataContext dataContext) {
   PsiElement[] elements = LangDataKeys.PSI_ELEMENT_ARRAY.getData(dataContext);
   if (elements == null) {
     final Object data = LangDataKeys.PSI_ELEMENT.getData(dataContext);
     if (data != null) {
       elements = new PsiElement[] {(PsiElement) data};
     } else {
       final Object data1 = LangDataKeys.PSI_FILE.getData(dataContext);
       if (data1 != null) {
         elements = new PsiElement[] {(PsiFile) data1};
       }
     }
   }
   return elements;
 }
 public Object getData(String dataId) {
   if (LangDataKeys.PSI_ELEMENT.is(dataId)) {
     TreePath path = getSelectedUniquePath();
     if (path == null) return null;
     DefaultMutableTreeNode node = (DefaultMutableTreeNode) path.getLastPathComponent();
     Object userObject = node.getUserObject();
     if (!(userObject instanceof AbstractTreeNode)) return null;
     AbstractTreeNode descriptor = (AbstractTreeNode) userObject;
     Object element = descriptor.getValue();
     if (element instanceof StructureViewTreeElement) {
       element = ((StructureViewTreeElement) element).getValue();
     }
     if (!(element instanceof PsiElement)) return null;
     if (!((PsiElement) element).isValid()) return null;
     return element;
   }
   if (LangDataKeys.PSI_ELEMENT_ARRAY.is(dataId)) {
     return convertToPsiElementsArray(getSelectedElements());
   }
   if (PlatformDataKeys.FILE_EDITOR.is(dataId)) {
     return myFileEditor;
   }
   if (PlatformDataKeys.CUT_PROVIDER.is(dataId)) {
     return myCopyPasteDelegator.getCutProvider();
   }
   if (PlatformDataKeys.COPY_PROVIDER.is(dataId)) {
     return myCopyPasteDelegator.getCopyProvider();
   }
   if (PlatformDataKeys.PASTE_PROVIDER.is(dataId)) {
     return myCopyPasteDelegator.getPasteProvider();
   }
   if (PlatformDataKeys.NAVIGATABLE.is(dataId)) {
     Object[] selectedElements = getSelectedTreeElements();
     if (selectedElements == null || selectedElements.length == 0) return null;
     if (selectedElements[0] instanceof Navigatable) {
       return selectedElements[0];
     }
   }
   if (PlatformDataKeys.HELP_ID.is(dataId)) {
     return getHelpID();
   }
   return super.getData(dataId);
 }
 @Override
 public Collection<AbstractTreeNode> getFavoriteNodes(
     final DataContext context, final ViewSettings viewSettings) {
   final Project project = CommonDataKeys.PROJECT.getData(context);
   if (project == null) return null;
   PsiElement[] elements = LangDataKeys.PSI_ELEMENT_ARRAY.getData(context);
   if (elements == null) {
     final PsiElement element = CommonDataKeys.PSI_ELEMENT.getData(context);
     if (element != null) {
       elements = new PsiElement[] {element};
     }
   }
   if (elements != null) {
     final Collection<AbstractTreeNode> result = new ArrayList<AbstractTreeNode>();
     for (PsiElement element : elements) {
       if (element instanceof PsiClass && checkClassUnderSources(element, project)) {
         result.add(new ClassSmartPointerNode(project, element, viewSettings));
       }
     }
     return result.isEmpty() ? null : result;
   }
   return null;
 }
  public void actionPerformed(AnActionEvent e) {
    final DataContext dataContext = e.getDataContext();
    final Project project = PlatformDataKeys.PROJECT.getData(dataContext);
    if (project == null) {
      return;
    }

    CommandProcessor.getInstance()
        .executeCommand(
            project,
            new Runnable() {
              public void run() {
                PsiDocumentManager.getInstance(project).commitAllDocuments();
              }
            },
            "",
            null);
    final Editor editor = PlatformDataKeys.EDITOR.getData(dataContext);
    PsiElement[] elements;

    PsiDirectory defaultTargetDirectory;
    if (editor != null) {
      PsiElement aElement = getTargetElement(editor, project);
      PsiFile file = PsiDocumentManager.getInstance(project).getPsiFile(editor.getDocument());
      if (file == null) return;
      elements = new PsiElement[] {aElement};
      if (aElement == null || !CopyHandler.canCopy(elements)) {
        elements = new PsiElement[] {file};
      }
      defaultTargetDirectory = file.getContainingDirectory();
    } else {
      PsiElement element = LangDataKeys.TARGET_PSI_ELEMENT.getData(dataContext);
      defaultTargetDirectory = element instanceof PsiDirectory ? (PsiDirectory) element : null;
      elements = LangDataKeys.PSI_ELEMENT_ARRAY.getData(dataContext);
    }
    doCopy(elements, defaultTargetDirectory);
  }
 protected void updateForToolWindow(
     String toolWindowId, DataContext dataContext, Presentation presentation) {
   PsiElement[] elements = LangDataKeys.PSI_ELEMENT_ARRAY.getData(dataContext);
   presentation.setEnabled(elements != null && CopyHandler.canCopy(elements));
 }
  public Object getData(String dataId) {
    if (PlatformDataKeys.PROJECT.is(dataId)) {
      return myProject;
    }
    if (PlatformDataKeys.NAVIGATABLE.is(dataId)) {
      final FavoritesTreeNodeDescriptor[] selectedNodeDescriptors = getSelectedNodeDescriptors();
      return selectedNodeDescriptors.length == 1 ? selectedNodeDescriptors[0].getElement() : null;
    }
    if (PlatformDataKeys.NAVIGATABLE_ARRAY.is(dataId)) {
      final List<Navigatable> selectedElements = getSelectedElements(Navigatable.class);
      return selectedElements.toArray(new Navigatable[selectedElements.size()]);
    }

    if (PlatformDataKeys.CUT_PROVIDER.is(dataId)) {
      return myCopyPasteDelegator.getCutProvider();
    }
    if (PlatformDataKeys.COPY_PROVIDER.is(dataId)) {
      return myCopyPasteDelegator.getCopyProvider();
    }
    if (PlatformDataKeys.PASTE_PROVIDER.is(dataId)) {
      return myCopyPasteDelegator.getPasteProvider();
    }
    if (PlatformDataKeys.HELP_ID.is(dataId)) {
      return myHelpId;
    }
    if (LangDataKeys.PSI_ELEMENT.is(dataId)) {
      PsiElement[] elements = getSelectedPsiElements();
      if (elements.length != 1) {
        return null;
      }
      return elements[0] != null && elements[0].isValid() ? elements[0] : null;
    }
    if (LangDataKeys.PSI_ELEMENT_ARRAY.is(dataId)) {
      final PsiElement[] elements = getSelectedPsiElements();
      ArrayList<PsiElement> result = new ArrayList<PsiElement>();
      for (PsiElement element : elements) {
        if (element.isValid()) {
          result.add(element);
        }
      }
      return result.isEmpty() ? null : result.toArray(new PsiElement[result.size()]);
    }

    if (LangDataKeys.IDE_VIEW.is(dataId)) {
      return myIdeView;
    }

    if (LangDataKeys.TARGET_PSI_ELEMENT.is(dataId)) {
      return null;
    }

    if (LangDataKeys.MODULE_CONTEXT.is(dataId)) {
      Module[] selected = getSelectedModules();
      return selected != null && selected.length == 1 ? selected[0] : null;
    }
    if (LangDataKeys.MODULE_CONTEXT_ARRAY.is(dataId)) {
      return getSelectedModules();
    }

    if (PlatformDataKeys.DELETE_ELEMENT_PROVIDER.is(dataId)) {
      final Object[] elements = getSelectedNodeElements();
      return elements != null && elements.length >= 1 && elements[0] instanceof Module
          ? myDeleteModuleProvider
          : myDeletePSIElementProvider;
    }
    if (ModuleGroup.ARRAY_DATA_KEY.is(dataId)) {
      final List<ModuleGroup> selectedElements = getSelectedElements(ModuleGroup.class);
      return selectedElements.isEmpty()
          ? null
          : selectedElements.toArray(new ModuleGroup[selectedElements.size()]);
    }
    if (LibraryGroupElement.ARRAY_DATA_KEY.is(dataId)) {
      final List<LibraryGroupElement> selectedElements =
          getSelectedElements(LibraryGroupElement.class);
      return selectedElements.isEmpty()
          ? null
          : selectedElements.toArray(new LibraryGroupElement[selectedElements.size()]);
    }
    if (NamedLibraryElement.ARRAY_DATA_KEY.is(dataId)) {
      final List<NamedLibraryElement> selectedElements =
          getSelectedElements(NamedLibraryElement.class);
      return selectedElements.isEmpty()
          ? null
          : selectedElements.toArray(new NamedLibraryElement[selectedElements.size()]);
    }
    if (CONTEXT_FAVORITES_ROOTS_DATA_KEY.is(dataId)) {
      List<FavoritesTreeNodeDescriptor> result = new ArrayList<FavoritesTreeNodeDescriptor>();
      FavoritesTreeNodeDescriptor[] selectedNodeDescriptors = getSelectedNodeDescriptors();
      for (FavoritesTreeNodeDescriptor selectedNodeDescriptor : selectedNodeDescriptors) {
        FavoritesTreeNodeDescriptor root = selectedNodeDescriptor.getFavoritesRoot();
        if (root != null && !(root.getElement().getValue() instanceof String)) {
          result.add(root);
        }
      }
      return result.toArray(new FavoritesTreeNodeDescriptor[result.size()]);
    }
    if (FAVORITES_LIST_NAME_DATA_KEY.is(dataId)) {
      return myListName;
    }
    FavoritesTreeNodeDescriptor[] descriptors = getSelectedNodeDescriptors();
    if (descriptors.length > 0) {
      List<AbstractTreeNode> nodes = new ArrayList<AbstractTreeNode>();
      for (FavoritesTreeNodeDescriptor descriptor : descriptors) {
        nodes.add(descriptor.getElement());
      }
      return myFavoritesTreeStructure.getDataFromProviders(nodes, dataId);
    }
    return null;
  }