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