| /******************************************************************************* |
| * Copyright (c) 2000, 2005 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.core.internal.dtree; |
| |
| /** |
| * An interface for comparing two data tree objects. Provides information |
| * on how an object has changed from one tree to another. |
| */ |
| public interface IComparator { |
| /** |
| * Returns an integer describing the changes between two data objects |
| * in a data tree. The first three bits of the returned integer are |
| * used during calculation of delta trees. The remaining bits can be |
| * assigned any meaning that is useful to the client. If there is no |
| * change in the two data objects, this method must return 0. |
| * |
| * @see NodeComparison |
| */ |
| int compare(Object o1, Object o2); |
| } |
