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• IElementComparer.java

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/*******************************************************************************
 * Copyright (c) 2000, 2015 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.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
 * equals and hashCode 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);
}