| /* |
| * Copyright (c) 1996, 1998, 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.beans; |
| |
| /** |
| * Under some circumstances a bean may be run on servers where a GUI |
| * is not available. This interface can be used to query a bean to |
| * determine whether it absolutely needs a gui, and to advise the |
| * bean whether a GUI is available. |
| * <p> |
| * This interface is for expert developers, and is not needed |
| * for normal simple beans. To avoid confusing end-users we |
| * avoid using getXXX setXXX design patterns for these methods. |
| * |
| * @since 1.1 |
| */ |
| |
| public interface Visibility { |
| |
| /** |
| * Determines whether this bean needs a GUI. |
| * |
| * @return True if the bean absolutely needs a GUI available in |
| * order to get its work done. |
| */ |
| boolean needsGui(); |
| |
| /** |
| * This method instructs the bean that it should not use the Gui. |
| */ |
| void dontUseGui(); |
| |
| /** |
| * This method instructs the bean that it is OK to use the Gui. |
| */ |
| void okToUseGui(); |
| |
| /** |
| * Determines whether this bean is avoiding using a GUI. |
| * |
| * @return true if the bean is currently avoiding use of the Gui. |
| * e.g. due to a call on dontUseGui(). |
| */ |
| boolean avoidingGui(); |
| |
| } |