| /******************************************************************************* |
| * Copyright (c) 2000, 2008 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.text.edits; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.eclipse.jface.text.BadLocationException; |
| import org.eclipse.jface.text.IDocument; |
| |
| |
| /** |
| * This class encapsulates the reverse changes of an executed text |
| * edit tree. To apply an undo memento to a document use method |
| * <code>apply(IDocument)</code>. |
| * <p> |
| * Clients can't add additional children to an undo edit nor can they |
| * add an undo edit as a child to another edit. Doing so results in |
| * both cases in a <code>MalformedTreeException<code>. |
| * |
| * @since 3.0 |
| * @noinstantiate This class is not intended to be instantiated by clients. |
| */ |
| public final class UndoEdit extends TextEdit { |
| |
| UndoEdit() { |
| super(0, Integer.MAX_VALUE); |
| } |
| |
| private UndoEdit(UndoEdit other) { |
| super(other); |
| } |
| |
| @Override |
| void internalAdd(TextEdit child) throws MalformedTreeException { |
| throw new MalformedTreeException(null, this, TextEditMessages.getString("UndoEdit.no_children")); //$NON-NLS-1$ |
| } |
| |
| @Override |
| void aboutToBeAdded(TextEdit parent) { |
| throw new MalformedTreeException(parent, this, TextEditMessages.getString("UndoEdit.can_not_be_added")); //$NON-NLS-1$ |
| } |
| |
| @Override |
| UndoEdit dispatchPerformEdits(TextEditProcessor processor) throws BadLocationException { |
| return processor.executeUndo(); |
| } |
| |
| @Override |
| void dispatchCheckIntegrity(TextEditProcessor processor) throws MalformedTreeException { |
| processor.checkIntegrityUndo(); |
| } |
| |
| @Override |
| protected TextEdit doCopy() { |
| return new UndoEdit(this); |
| } |
| |
| /* |
| * @see TextEdit#accept0 |
| */ |
| @Override |
| protected void accept0(TextEditVisitor visitor) { |
| boolean visitChildren= visitor.visit(this); |
| if (visitChildren) { |
| acceptChildren(visitor); |
| } |
| } |
| |
| /* |
| * @see TextEdit#performDocumentUpdating |
| */ |
| @Override |
| int performDocumentUpdating(IDocument document) throws BadLocationException { |
| fDelta= 0; |
| return fDelta; |
| } |
| |
| void add(ReplaceEdit edit) { |
| List<TextEdit> children= internalGetChildren(); |
| if (children == null) { |
| children= new ArrayList<>(2); |
| internalSetChildren(children); |
| } |
| children.add(edit); |
| } |
| |
| void defineRegion(int offset, int length) { |
| internalSetOffset(offset); |
| internalSetLength(length); |
| } |
| |
| @Override |
| boolean deleteChildren() { |
| return false; |
| } |
| } |
| |