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JFace is a UI toolkit with classes for handling many common UI programming tasks. JFace is window-system-independent in both its API and implementation, and is designed to work with SWT without hiding it. JFace includes the usual UI toolkit components of image and font registries, text, dialog, preference and wizard frameworks, and progress reporting for long running operations. Two of its more interesting features are actions and viewers. The action mechanism allows user commands to be defined independently from their exact whereabouts in the UI. Viewers are model based adapters for certain SWT widgets, simplifying the presentation of application data structured as lists, tables or trees.

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/*******************************************************************************
 * 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;

import java.util.EventObject;

import org.eclipse.core.runtime.Assert;

/**
 * Event object describing a selection change. The source of these
 * events is a selection provider.
 *
 * @see ISelection
 * @see ISelectionProvider
 * @see ISelectionChangedListener
 */
public class SelectionChangedEvent extends EventObject {

    /**
     * Generated serial version UID for this class.
     * @since 3.1
     */
    private static final long serialVersionUID = 3835149545519723574L;
    
    /**
     * The selection.
     */
    protected ISelection selection;

    /**
     * Creates a new event for the given source and selection.
     *
     * @param source the selection provider
     * @param selection the selection
     */
    public SelectionChangedEvent(ISelectionProvider source, ISelection selection) {
        super(source);
        Assert.isNotNull(selection);
        this.selection = selection;
    }

    /**
     * Returns the selection.
     *
     * @return the selection
     */
    public ISelection getSelection() {
        return selection;
    }

    /**
     * Returns the selection provider that is the source of this event.
     *
     * @return the originating selection provider
     */
    public ISelectionProvider getSelectionProvider() {
        return (ISelectionProvider) getSource();
    }
}