/* * 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. *
* 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. */ 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(); }