How to use org.eclipse.jdt.internal.ui.actions

private SearchPatternData tryIfPropertyFileSelected(IFile file) {
  IType accessorType= getAccessorType(file);
  return (accessorType != null) ? new SearchPatternData(accessorType, file) : null;
}

  @Override
  protected void fillMenu(IMenuManager menu) {
    SurroundWithTryCatchAction surroundWithTryCatch= SurroundWithActionGroup.createSurroundWithTryCatchAction(editor);
    SurroundWithTryMultiCatchAction surroundWithTryMultiCatch= SurroundWithActionGroup.createSurroundWithTryMultiCatchAction(editor);
    SurroundWithTemplateMenuAction.fillMenu(menu, editor, surroundWithTryCatch, surroundWithTryMultiCatch);
  }
}.createMenu();

public FilterUncategorizedMembersAction() {
  setText(ActionMessages.CategoryFilterActionGroup_ShowUncategorizedMembers);
  setChecked(!fFilterUncategorizedMembers);
  setId(FILTER_CATEGORY_ACTION_ID);
}

public AllCleanUpsAction(IWorkbenchSite site) {
  super(site);
  setToolTipText(ActionMessages.CleanUpAction_tooltip);
  setDescription(ActionMessages.CleanUpAction_description);
  installPreferenceListener();
  updateActionLabel();
  // PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.ORGANIZE_IMPORTS_ACTION);
}

private void updateActionLabel() {
  if (showWizard()) {
    setText(ActionMessages.CleanUpAction_labelWizard);
  } else {
    setText(ActionMessages.CleanUpAction_label);
  }
}

public static boolean canOperateOn(JavaEditor editor) {
  if (editor == null)
    return false;
  return getInput(editor) != null;
}

/**
 * Perform a code resolve at the current selection of an editor
 * 
 * @param editor the editor
 * @return the resolved elements (only from primary working copies)
 * @throws JavaModelException when the type root can not be accessed
 */
public static IJavaElement[] codeResolve(JavaEditor editor) throws JavaModelException {
  return codeResolve(editor, true);
}

private IJavaElement elementAtOffset() {
  try {
    return SelectionConverter.getElementAtOffset(fEditor);
  } catch(JavaModelException e) {
  }
  return null;
}

/**
 * Returns the formatted resource string associated with the given key in the resource bundle. 
 * <code>MessageFormat</code> is used to format the message. If there isn't  any value 
 * under the given key, the key is returned.
 *
 * @param key the resource key
 * @param arg the message argument
 * @return the string
 */	
public static String getFormattedString(String key, Object arg) {
  return getFormattedString(key, new Object[] { arg });
}

public GenerateConstructorUsingFieldsValidator(GenerateConstructorUsingFieldsSelectionDialog dialog, ITypeBinding type, int entries) {
  fEntries= entries;
  fDialog= dialog;
  fType= type;
  fSignatures= getExistingConstructorSignatures();
}

/**
 * Creates a new action group with a given set of actions.
 * 
 * @param actions            the actions for this multi group
 * @param currentSelection    decides which action is selected in the menu on start up.
 *                             Denotes the location in the actions array of the current
 *                             selected state. It cannot be null.
 */
public MultiActionGroup(IAction[] actions, int currentSelection) {
  super();
  setActions(actions, currentSelection);
}

private boolean processChildren(IJavaElement[] children, IResultCollector collector) {
  for (int i= 0; i < children.length; i++) {
    if (collectCategories(children[i], collector))
      return true;
  }
  return false;
}

@Override
public void selectionChanged(IAction action, ISelection selection) {
  super.selectionChanged(action, selection);
  fSelection= selection;
}

private boolean canEnable(Object[] objects) {
  for (int i= 0; i < objects.length; i++) {
    Object element= objects[i];
    if (isValideElement(element))
      return true;
  }
  return false;
}

  @Override
  protected void fillMenu(IMenuManager menu) {
    SurroundWithTryCatchAction surroundWithTryCatch= SurroundWithActionGroup.createSurroundWithTryCatchAction(editor);
    SurroundWithTryMultiCatchAction surroundWithTryMultiCatch= SurroundWithActionGroup.createSurroundWithTryMultiCatchAction(editor);
    SurroundWithTemplateMenuAction.fillMenu(menu, editor, surroundWithTryCatch, surroundWithTryMultiCatch);
  }
}.createMenu();

private SearchPatternData tryIfPropertyFileSelected(IFile file) {
  IType accessorType= getAccessorType(file);
  return (accessorType != null) ? new SearchPatternData(accessorType, file) : null;
}

public static ICompilationUnit getInputAsCompilationUnit(JavaEditor editor) {
  Object editorInput= SelectionConverter.getInput(editor);
  if (editorInput instanceof ICompilationUnit)
    return (ICompilationUnit)editorInput;
  return null;
}

private IJavaElement getJavaElementFromEditor() throws JavaModelException {
  IJavaElement[] elements= SelectionConverter.codeResolve(fEditor);
  if (elements == null || elements.length != 1)
    return null;
  return elements[0];
}

/**
 * Returns the formatted resource string associated with the given key in the resource bundle.
 * <code>MessageFormat</code> is used to format the message. If there isn't  any value
 * under the given key, the key is returned.
 *
 * @param key the resource key
 * @param arg the message argument
 * @return the string
 */
public static String getFormattedString(String key, Object arg) {
  return getFormattedString(key, new Object[] { arg });
}

public static IClassFile getInputAsClassFile(JavaEditor editor) {
  Object editorInput= SelectionConverter.getInput(editor);
  if (editorInput instanceof IClassFile)
    return (IClassFile)editorInput;
  return null;
}