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

 ICompilationUnit cu = ... // an ICompilationUnit to rename

RefactoringContribution contribution =
  RefactoringCore.getRefactoringContribution(IJavaRefactorings .RENAME_COMPILATION_UNIT);
RenameJavaElementDescriptor descriptor =
  (RenameJavaElementDescriptor) contribution.createDescriptor();
descriptor.setProject(cu.getResource().getProject().getName( ));
descriptor.setNewName("NewClass"); // new name for a Class
descriptor.setJavaElement(cu);

RefactoringStatus status = new RefactoringStatus();
try {
  Refactoring refactoring = descriptor.createRefactoring(status);

  IProgressMonitor monitor = new NullProgressMonitor();
  refactoring.checkInitialConditions(monitor);
  refactoring.checkFinalConditions(monitor);
  Change change = refactoring.createChange(monitor);
  change.perform(monitor);

} catch (CoreException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
} catch (Exception e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
}

private JavaSearchActionGroup(IWorkbenchSite site) {
  fReferencesGroup= new ReferencesSearchGroup(site);
  fReadAccessGroup= new ReadReferencesSearchGroup(site);
  fWriteAccessGroup= new WriteReferencesSearchGroup(site);
  fDeclarationsGroup= new DeclarationsSearchGroup(site);
  fImplementorsGroup= new ImplementorsSearchGroup(site);
  fOccurrencesGroup= new OccurrencesSearchGroup(site);
}

@Override
public void setContext(ActionContext context) {
  fReferencesGroup.setContext(context);
  fDeclarationsGroup.setContext(context);
  fImplementorsGroup.setContext(context);
  fReadAccessGroup.setContext(context);
  fWriteAccessGroup.setContext(context);
  fOccurrencesGroup.setContext(context);
}

@Override
public void fillActionBars(IActionBars actionBar) {
  super.fillActionBars(actionBar);
  fReferencesGroup.fillActionBars(actionBar);
  fDeclarationsGroup.fillActionBars(actionBar);
  fImplementorsGroup.fillActionBars(actionBar);
  fReadAccessGroup.fillActionBars(actionBar);
  fWriteAccessGroup.fillActionBars(actionBar);
  fOccurrencesGroup.fillActionBars(actionBar);
}

  @Override
  public void dispose() {
    fReferencesGroup.dispose();
    fDeclarationsGroup.dispose();
    fImplementorsGroup.dispose();
    fReadAccessGroup.dispose();
    fWriteAccessGroup.dispose();
    fOccurrencesGroup.dispose();

    super.dispose();
  }
}

public NewSearchViewActionGroup(IViewPart part) {
  Assert.isNotNull(part);
  OpenViewActionGroup openViewActionGroup;
  setGroups(new ActionGroup[]{
    fOpenEditorActionGroup= new OpenEditorActionGroup(part),
    openViewActionGroup= new OpenViewActionGroup(part),
    new GenerateActionGroup(part), 
    new RefactorActionGroup(part),
    new JavaSearchActionGroup(part) 
  });
  openViewActionGroup.containsShowInMenu(false);
}

@Override
public void fillContextMenu(IMenuManager menu) {
  if (fInViewPart) {
    fOpenViewGroup.fillContextMenu(menu);
    fCCPGroup.fillContextMenu(menu);
    fBuildPathGroup.fillContextMenu(menu);
    fGenerateGroup.fillContextMenu(menu);
    fSearchGroup.fillContextMenu(menu);
  }
}

private ShowActionGroup(IWorkbenchSite site) {
  fShowInPackagesViewAction= new ShowInPackageViewAction(site);
  fShowInPackagesViewAction.setActionDefinitionId(IJavaEditorActionDefinitionIds.SHOW_IN_PACKAGE_VIEW);
  
  initialize(site , false);		
}

/**
 * Creates a new <code>NavigateActionGroup</code>. The group requires
 * that the selection provided by the part's selection provider is of type <code>
 * org.eclipse.jface.viewers.IStructuredSelection</code>.
 *
 * @param part the view part that owns this action group
 */
public NavigateActionGroup(IViewPart  part) {
  fOpenEditorActionGroup= new OpenEditorActionGroup(part);
  fOpenViewActionGroup= new OpenViewActionGroup(part);
}

private NonNLSElement analyze(ICompilationUnit cu) throws CoreException {
  int count= countNonExternalizedStrings(cu);
  if (count == 0)
    return null;
  else	
    return new NonNLSElement(cu, count);
}

private JavaSearchActionGroup(IWorkbenchSite site) {
  fReferencesGroup= new ReferencesSearchGroup(site);
  fReadAccessGroup= new ReadReferencesSearchGroup(site);
  fWriteAccessGroup= new WriteReferencesSearchGroup(site);
  fDeclarationsGroup= new DeclarationsSearchGroup(site);
  fImplementorsGroup= new ImplementorsSearchGroup(site);
  fOccurrencesGroup= new OccurrencesSearchGroup(site);
}

public void fillActionBars(IActionBars actionBar) {
  super.fillActionBars(actionBar);
  fReferencesGroup.fillActionBars(actionBar);
  fDeclarationsGroup.fillActionBars(actionBar);
  fImplementorsGroup.fillActionBars(actionBar);
  fReadAccessGroup.fillActionBars(actionBar);
  fWriteAccessGroup.fillActionBars(actionBar);
  fOccurrencesGroup.fillActionBars(actionBar);
}

@Override
public void setContext(ActionContext context) {
  fReferencesGroup.setContext(context);
  fDeclarationsGroup.setContext(context);
  fImplementorsGroup.setContext(context);
  fReadAccessGroup.setContext(context);
  fWriteAccessGroup.setContext(context);
  fOccurrencesGroup.setContext(context);
}

  @Override
  public void dispose() {
    fReferencesGroup.dispose();
    fDeclarationsGroup.dispose();
    fImplementorsGroup.dispose();
    fReadAccessGroup.dispose();
    fWriteAccessGroup.dispose();
    fOccurrencesGroup.dispose();

    super.dispose();
  }
}

private ShowActionGroup(IWorkbenchSite site) {
  fShowInPackagesViewAction= new ShowInPackageViewAction(site);
  fShowInPackagesViewAction.setActionDefinitionId(IJavaEditorActionDefinitionIds.SHOW_IN_PACKAGE_VIEW);
  initialize(site , false);
}

/**
 * Creates a new <code>NavigateActionGroup</code>. The group requires
 * that the selection provided by the part's selection provider is of type <code>
 * org.eclipse.jface.viewers.IStructuredSelection</code>.
 *
 * @param part the view part that owns this action group
 */
public NavigateActionGroup(IViewPart  part) {
  fOpenEditorActionGroup= new OpenEditorActionGroup(part);
  fOpenViewActionGroup= new OpenViewActionGroup(part);
}

private NonNLSElement analyze(ICompilationUnit cu) throws CoreException {
  int count= countNonExternalizedStrings(cu);
  if (count == 0)
    return null;
  else
    return new NonNLSElement(cu, count);
}

private JavaSearchActionGroup(IWorkbenchSite site) {
  fReferencesGroup= new ReferencesSearchGroup(site);
  fReadAccessGroup= new ReadReferencesSearchGroup(site);
  fWriteAccessGroup= new WriteReferencesSearchGroup(site);
  fDeclarationsGroup= new DeclarationsSearchGroup(site);
  fImplementorsGroup= new ImplementorsSearchGroup(site);
  fOccurrencesGroup= new OccurrencesSearchGroup(site);
}

@Override
public void fillActionBars(IActionBars actionBar) {
  super.fillActionBars(actionBar);
  fReferencesGroup.fillActionBars(actionBar);
  fDeclarationsGroup.fillActionBars(actionBar);
  fImplementorsGroup.fillActionBars(actionBar);
  fReadAccessGroup.fillActionBars(actionBar);
  fWriteAccessGroup.fillActionBars(actionBar);
  fOccurrencesGroup.fillActionBars(actionBar);
}

public void setContext(ActionContext context) {
  fReferencesGroup.setContext(context);
  fDeclarationsGroup.setContext(context);
  fImplementorsGroup.setContext(context);
  fReadAccessGroup.setContext(context);
  fWriteAccessGroup.setContext(context);
  fOccurrencesGroup.setContext(context);
}