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
/*******************************************************************************
 * 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.
/**
 * 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 Also:
NodeComparison/**
	 * 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);
}