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/*******************************************************************************
* Copyright (c) 2000, 2015 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.jface.viewers;
/**
* This interface is used to compare elements in a viewer for equality,
* and to provide the hash code for an element.
* This allows the client of the viewer to specify different equality criteria
* and a different hash code implementation than the
* <code>equals</code> and <code>hashCode</code> implementations of the
* elements themselves.
*
* @see StructuredViewer#setComparer
*/
public interface IElementComparer {
/**
* Compares two elements for equality
*
* @param a the first element
* @param b the second element
* @return whether a is equal to b
*/
boolean equals(Object a, Object b);
/**
* Returns the hash code for the given element.
* @param element the element the hash code is calculated for
*
* @return the hash code for the given element
*/
int hashCode(Object element);
}
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