/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jface.viewers;

 
/**
 * Interface common to all objects that provide a selection.
 *
 * @see ISelection
 * @see ISelectionChangedListener
 * @see SelectionChangedEvent
 */
public interface ISelectionProvider {
/**
 * Adds a listener for selection changes in this selection provider.
 * Has no effect if an identical listener is already registered.
 *
 * @param listener a selection changed listener
 */
public void addSelectionChangedListener(ISelectionChangedListener listener);
/**
 * Returns the current selection for this provider.
 * 
 * @return the current selection
 */
public ISelection getSelection();
/**
 * Removes the given selection change listener from this selection provider.
 * Has no affect if an identical listener is not registered.
 *
 * @param listener a selection changed listener
 */
public void removeSelectionChangedListener(ISelectionChangedListener listener);
/**
 * Sets the current selection for this selection provider.
 *
 * @param selection the new selection
 */
public void setSelection(ISelection selection);
}