/*

 * Copyright (c) 2000, 2004, 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package java.awt;

/**

 * Thrown when code that is dependent on a keyboard, display, or mouse

 * is called in an environment that does not support a keyboard, display,

 * or mouse.

 *

 * @since 1.4

 * @author  Michael Martak

 */

public class HeadlessException extends UnsupportedOperationException {

    /*

     * JDK 1.4 serialVersionUID

     */

    private static final long serialVersionUID = 167183644944358563L;

    public HeadlessException() {}

    public HeadlessException(String msg) {

        super(msg);

    }

    public String getMessage() {

        String superMessage = super.getMessage();

        String headlessMessage = GraphicsEnvironment.getHeadlessMessage();

        if (superMessage == null) {

            return headlessMessage;

        } else if (headlessMessage == null) {

            return superMessage;

        } else {

            return superMessage + headlessMessage;

        }

    }

}