| /******************************************************************************* |
| * Copyright (c) 2000, 2005 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.debug.internal.ui.actions; |
| |
| import org.eclipse.core.runtime.CoreException; |
| import org.eclipse.core.runtime.IAdaptable; |
| import org.eclipse.core.runtime.IAdapterManager; |
| import org.eclipse.core.runtime.Platform; |
| import org.eclipse.debug.internal.ui.DebugUIPlugin; |
| import org.eclipse.jface.action.IAction; |
| import org.eclipse.jface.viewers.ISelection; |
| import org.eclipse.jface.viewers.ISelectionProvider; |
| import org.eclipse.jface.viewers.IStructuredSelection; |
| import org.eclipse.ui.IPartListener; |
| import org.eclipse.ui.IPartService; |
| import org.eclipse.ui.IWorkbenchPart; |
| import org.eclipse.ui.IWorkbenchWindow; |
| import org.eclipse.ui.IWorkbenchWindowActionDelegate; |
| import org.eclipse.ui.texteditor.IUpdate; |
| |
| /** |
| * Global retargettable debug action. |
| * |
| * @since 3.0 |
| */ |
| public abstract class RetargetAction implements IWorkbenchWindowActionDelegate, IPartListener, IUpdate { |
| |
| protected IWorkbenchWindow fWindow = null; |
| private IWorkbenchPart fActivePart = null; |
| private Object fTargetAdapter = null; |
| private IAction fAction = null; |
| private static final ISelection EMPTY_SELECTION = new EmptySelection(); |
| |
| static class EmptySelection implements ISelection { |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.jface.viewers.ISelection#isEmpty() |
| */ |
| public boolean isEmpty() { |
| return true; |
| } |
| |
| } |
| |
| /** |
| * Returns the current selection in the active part, possibly |
| * and empty selection, but never <code>null</code>. |
| * |
| * @return the selection in the active part, possibly empty |
| */ |
| private ISelection getTargetSelection() { |
| if (fActivePart != null) { |
| ISelectionProvider selectionProvider = fActivePart.getSite().getSelectionProvider(); |
| if (selectionProvider != null) { |
| return selectionProvider.getSelection(); |
| } |
| } |
| return EMPTY_SELECTION; |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.ui.IWorkbenchWindowActionDelegate#dispose() |
| */ |
| public void dispose() { |
| fWindow.getPartService().removePartListener(this); |
| fActivePart = null; |
| fTargetAdapter = null; |
| |
| } |
| /* (non-Javadoc) |
| * @see org.eclipse.ui.IWorkbenchWindowActionDelegate#init(org.eclipse.ui.IWorkbenchWindow) |
| */ |
| public void init(IWorkbenchWindow window) { |
| this.fWindow = window; |
| IPartService partService = window.getPartService(); |
| partService.addPartListener(this); |
| IWorkbenchPart part = partService.getActivePart(); |
| if (part != null) { |
| partActivated(part); |
| } |
| } |
| /* (non-Javadoc) |
| * @see org.eclipse.ui.IActionDelegate#run(org.eclipse.jface.action.IAction) |
| */ |
| public void run(IAction action) { |
| if (fTargetAdapter != null) { |
| try { |
| performAction(fTargetAdapter, getTargetSelection(), fActivePart); |
| } catch (CoreException e) { |
| DebugUIPlugin.errorDialog(fWindow.getShell(), ActionMessages.RetargetAction_2, ActionMessages.RetargetAction_3, e.getStatus()); // |
| } |
| } |
| } |
| |
| /** |
| * Performs the specific breakpoint toggling. |
| * |
| * @param selection selection in the active part |
| * @param part active part |
| * @throws CoreException if an exception occurrs |
| */ |
| protected abstract void performAction(Object target, ISelection selection, IWorkbenchPart part) throws CoreException; |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.ui.IActionDelegate#selectionChanged(org.eclipse.jface.action.IAction, org.eclipse.jface.viewers.ISelection) |
| */ |
| public void selectionChanged(IAction action, ISelection selection) { |
| this.fAction = action; |
| // if the active part did not provide an adapter, see if the selectoin does |
| if (fTargetAdapter == null && selection instanceof IStructuredSelection) { |
| IStructuredSelection ss = (IStructuredSelection) selection; |
| if (!ss.isEmpty()) { |
| Object object = ss.getFirstElement(); |
| if (object instanceof IAdaptable) { |
| fTargetAdapter = getAdapter((IAdaptable) object); |
| } |
| } |
| } |
| update(); |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.ui.IPartListener#partActivated(org.eclipse.ui.IWorkbenchPart) |
| */ |
| public void partActivated(IWorkbenchPart part) { |
| fActivePart = part; |
| fTargetAdapter = getAdapter(part); |
| update(); |
| } |
| |
| protected Object getAdapter(IAdaptable adaptable) { |
| Object adapter = adaptable.getAdapter(getAdapterClass()); |
| if (adapter == null) { |
| IAdapterManager adapterManager = Platform.getAdapterManager(); |
| if (adapterManager.hasAdapter(adaptable, getAdapterClass().getName())) { |
| fTargetAdapter = adapterManager.loadAdapter(adaptable, getAdapterClass().getName()); |
| } |
| } |
| return adapter; |
| } |
| |
| /** |
| * Returns the type of adapter (target) this action works on. |
| * |
| * @return the type of adapter this action works on |
| */ |
| protected abstract Class getAdapterClass(); |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.ui.IPartListener#partBroughtToTop(org.eclipse.ui.IWorkbenchPart) |
| */ |
| public void partBroughtToTop(IWorkbenchPart part) { |
| } |
| /* (non-Javadoc) |
| * @see org.eclipse.ui.IPartListener#partClosed(org.eclipse.ui.IWorkbenchPart) |
| */ |
| public void partClosed(IWorkbenchPart part) { |
| clearPart(part); |
| } |
| |
| /** |
| * Clears reference to active part and adapter when a relevant part |
| * is closed or deactivated. |
| * |
| * @param part workbench part that has been closed or deactivated |
| */ |
| protected void clearPart(IWorkbenchPart part) { |
| if (part.equals(fActivePart)) { |
| fActivePart = null; |
| fTargetAdapter = null; |
| } |
| } |
| /* (non-Javadoc) |
| * @see org.eclipse.ui.IPartListener#partDeactivated(org.eclipse.ui.IWorkbenchPart) |
| */ |
| public void partDeactivated(IWorkbenchPart part) { |
| clearPart(part); |
| } |
| /* (non-Javadoc) |
| * @see org.eclipse.ui.IPartListener#partOpened(org.eclipse.ui.IWorkbenchPart) |
| */ |
| public void partOpened(IWorkbenchPart part) { |
| } |
| /* (non-Javadoc) |
| * @see org.eclipse.ui.texteditor.IUpdate#update() |
| */ |
| public void update() { |
| if (fAction == null) { |
| return; |
| } |
| if (fTargetAdapter != null) { |
| fAction.setEnabled(canPerformAction(fTargetAdapter, getTargetSelection(), fActivePart)); |
| } else { |
| fAction.setEnabled(false); |
| } |
| } |
| |
| /** |
| * Returns whether the specific operation is supported. |
| * |
| * @param target the target adapter |
| * @param selection the selection to verify the operation on |
| * @param part the part the operation has been requested on |
| * @return whether the operation can be performed |
| */ |
| protected abstract boolean canPerformAction(Object target, ISelection selection, IWorkbenchPart part); |
| } |