| /******************************************************************************* |
| * Copyright (c) 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.core.internal.databinding.observable.tree; |
| |
| /** |
| * @since 1.1 |
| * |
| */ |
| public abstract class TreeDiffNode { |
| |
| /** |
| * |
| */ |
| public final static int NO_CHANGE = 0x00; |
| |
| /** |
| * |
| */ |
| public final static int ADDED = 0x01; |
| |
| /** |
| * |
| */ |
| public final static int REMOVED = 0x02; |
| |
| /** |
| * |
| */ |
| public final static int REPLACED = 0x03; |
| |
| /** |
| * |
| */ |
| public static final TreeDiffNode[] NO_CHILDREN = new TreeDiffNode[0]; |
| |
| /** |
| * |
| */ |
| public static final int INDEX_UNKNOWN = -1; |
| |
| /** |
| * @return the change type |
| */ |
| public abstract int getChangeType(); |
| |
| /** |
| * @return the element that was removed, or the replaced element |
| */ |
| public abstract Object getOldElement(); |
| |
| /** |
| * @return the element that was not changed, added, or the replacement |
| * element |
| */ |
| public abstract Object getNewElement(); |
| |
| /** |
| * @return the index at which the element was added, removed, or replaced |
| */ |
| public abstract int getIndex(); |
| |
| /** |
| * Returns the child tree diff objects that describe changes to children. If |
| * the change type is REMOVED, there will be no children. |
| * |
| * @return the nodes representing changes to children |
| */ |
| public abstract TreeDiffNode[] getChildren(); |
| |
| protected void doAccept(TreeDiffVisitor visitor, TreePath parentPath) { |
| TreePath currentPath = parentPath.createChildPath(getNewElement()); |
| boolean recurse = visitor.visit(this, currentPath); |
| if (recurse) { |
| TreeDiffNode[] children = getChildren(); |
| for (int i = 0; i < children.length; i++) { |
| TreeDiffNode child = children[i]; |
| child.doAccept(visitor, currentPath); |
| } |
| } |
| } |
| |
| } |