| /******************************************************************************* |
| * Copyright (c) 2000, 2007 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.HashMap; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| |
| import org.eclipse.core.runtime.Assert; |
| |
| |
| /** |
| * Copies a tree of text edits. A text edit copier keeps a map |
| * between original and new text edits. It can be used to map |
| * a copy back to its original edit. |
| * |
| * @since 3.0 |
| */ |
| public final class TextEditCopier { |
| |
| private TextEdit fEdit; |
| private Map<TextEdit, TextEdit> fCopies; |
| |
| /** |
| * Constructs a new <code>TextEditCopier</code> for the |
| * given edit. The actual copy is done by calling <code> |
| * perform</code>. |
| * |
| * @param edit the edit to copy |
| * |
| * @see #perform() |
| */ |
| public TextEditCopier(TextEdit edit) { |
| super(); |
| Assert.isNotNull(edit); |
| fEdit= edit; |
| fCopies= new HashMap<>(); |
| } |
| |
| /** |
| * Performs the actual copying. |
| * |
| * @return the copy |
| */ |
| public TextEdit perform() { |
| TextEdit result= doCopy(fEdit); |
| if (result != null) { |
| for (Iterator<TextEdit> iter= fCopies.keySet().iterator(); iter.hasNext();) { |
| TextEdit edit= iter.next(); |
| edit.postProcessCopy(this); |
| } |
| } |
| return result; |
| } |
| |
| /** |
| * Returns the copy for the original text edit. |
| * |
| * @param original the original for which the copy |
| * is requested |
| * @return the copy of the original edit or <code>null</code> |
| * if the original isn't managed by this copier |
| */ |
| public TextEdit getCopy(TextEdit original) { |
| Assert.isNotNull(original); |
| return fCopies.get(original); |
| } |
| |
| //---- helper methods -------------------------------------------- |
| |
| private TextEdit doCopy(TextEdit edit) { |
| TextEdit result= edit.doCopy(); |
| List<TextEdit> children= edit.internalGetChildren(); |
| if (children != null) { |
| List<TextEdit> newChildren= new ArrayList<>(children.size()); |
| for (Iterator<TextEdit> iter= children.iterator(); iter.hasNext();) { |
| TextEdit childCopy= doCopy(iter.next()); |
| childCopy.internalSetParent(result); |
| newChildren.add(childCopy); |
| } |
| result.internalSetChildren(newChildren); |
| } |
| addCopy(edit, result); |
| return result; |
| } |
| |
| private void addCopy(TextEdit original, TextEdit copy) { |
| fCopies.put(original, copy); |
| } |
| } |