/*******************************************************************************
* Copyright (c) 2000, 2005 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.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);
}