/*

 * Copyright (c) 1997, 2002, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

package javax.swing;

import javax.swing.event.*;

/**

 * A model that supports at most one indexed selection.

 *

 * @author Dave Moore

 * @since 1.2

 */

public interface SingleSelectionModel {

    /**

     * Returns the model's selection.

     *

     * @return  the model's selection, or -1 if there is no selection

     * @see     #setSelectedIndex

     */

    public int getSelectedIndex();

    /**

     * Sets the model's selected index to <I>index</I>.

     *

     * Notifies any listeners if the model changes

     *

     * @param index an int specifying the model selection

     * @see   #getSelectedIndex

     * @see   #addChangeListener

     */

    public void setSelectedIndex(int index);

    /**

     * Clears the selection (to -1).

     */

    public void clearSelection();

    /**

     * Returns true if the selection model currently has a selected value.

     * @return true if a value is currently selected

     */

    public boolean isSelected();

    /**

     * Adds <I>listener</I> as a listener to changes in the model.

     * @param listener the ChangeListener to add

     */

    void addChangeListener(ChangeListener listener);

    /**

     * Removes <I>listener</I> as a listener to changes in the model.

     * @param listener the ChangeListener to remove

     */

    void removeChangeListener(ChangeListener listener);

}