| /******************************************************************************* |
| * Copyright (c) 2000, 2006 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.ui.internal; |
| |
| import org.eclipse.core.runtime.IAdaptable; |
| import org.eclipse.ui.IEditorInput; |
| import org.eclipse.ui.IEditorPart; |
| import org.eclipse.ui.IElementFactory; |
| import org.eclipse.ui.IMemento; |
| import org.eclipse.ui.IPersistableElement; |
| import org.eclipse.ui.PlatformUI; |
| import org.eclipse.ui.XMLMemento; |
| |
| /** |
| * Keeps the info to save, restore or identify and editor. |
| * Instances of this class are shared between history entries and there should be |
| * only one instance making reference to the same editor. |
| */ |
| public class NavigationHistoryEditorInfo { |
| String editorID; |
| |
| IEditorInput editorInput; |
| |
| int refCount = 0; |
| |
| IMemento memento; |
| |
| NavigationHistoryEditorInfo(IEditorPart part) { |
| editorID = part.getSite().getId(); |
| editorInput = part.getEditorInput(); |
| } |
| |
| NavigationHistoryEditorInfo(IMemento memento) { |
| this.memento = memento; |
| } |
| |
| boolean isPersistable() { |
| if (editorInput != null) { |
| IPersistableElement persistable = editorInput.getPersistable(); |
| return persistable != null; |
| } |
| return memento != null; |
| } |
| |
| void handlePartClosed() { |
| if (!isPersistable()) { |
| return; |
| } |
| if (memento == null) { |
| IPersistableElement persistable = editorInput.getPersistable(); |
| memento = XMLMemento |
| .createWriteRoot(IWorkbenchConstants.TAG_EDITOR); |
| memento.putString(IWorkbenchConstants.TAG_ID, editorID); |
| memento.putString(IWorkbenchConstants.TAG_FACTORY_ID, persistable |
| .getFactoryId()); |
| persistable.saveState(memento); |
| } |
| editorID = null; |
| editorInput = null; |
| } |
| |
| void restoreEditor() { |
| if (memento == null) { |
| return; |
| } |
| String factoryID = memento |
| .getString(IWorkbenchConstants.TAG_FACTORY_ID); |
| IElementFactory factory = PlatformUI.getWorkbench().getElementFactory( |
| factoryID); |
| if (factory != null) { |
| IAdaptable element = factory.createElement(memento); |
| if (element instanceof IEditorInput) { |
| editorInput = (IEditorInput) element; |
| editorID = memento.getString(IWorkbenchConstants.TAG_ID); |
| } |
| } |
| memento = null; |
| } |
| |
| void saveState(IMemento mem) { |
| if (editorInput != null) { |
| IPersistableElement persistable = editorInput.getPersistable(); |
| mem.putString(IWorkbenchConstants.TAG_ID, editorID); |
| mem.putString(IWorkbenchConstants.TAG_FACTORY_ID, persistable |
| .getFactoryId()); |
| persistable.saveState(mem); |
| } else if (memento != null) { |
| mem.putMemento(memento); |
| } |
| } |
| } |