001/* java.beans.Visibility 002 Copyright (C) 1998, 1999 Free Software Foundation, Inc. 003 004This file is part of GNU Classpath. 005 006GNU Classpath is free software; you can redistribute it and/or modify 007it under the terms of the GNU General Public License as published by 008the Free Software Foundation; either version 2, or (at your option) 009any later version. 010 011GNU Classpath is distributed in the hope that it will be useful, but 012WITHOUT ANY WARRANTY; without even the implied warranty of 013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014General Public License for more details. 015 016You should have received a copy of the GNU General Public License 017along with GNU Classpath; see the file COPYING. If not, write to the 018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 01902110-1301 USA. 020 021Linking this library statically or dynamically with other modules is 022making a combined work based on this library. Thus, the terms and 023conditions of the GNU General Public License cover the whole 024combination. 025 026As a special exception, the copyright holders of this library give you 027permission to link this library with independent modules to produce an 028executable, regardless of the license terms of these independent 029modules, and to copy and distribute the resulting executable under 030terms of your choice, provided that you also meet, for each linked 031independent module, the terms and conditions of the license of that 032module. An independent module is a module which is not derived from 033or based on this library. If you modify this library, you may extend 034this exception to your version of the library, but you are not 035obligated to do so. If you do not wish to do so, delete this 036exception statement from your version. */ 037 038 039package java.beans; 040 041/** 042 * Visibility is an interface a Bean may implement so that the environment 043 * can tell the Bean whether there is a GUI or not, and so that the Bean 044 * can tell the environment whether it needs one or can run without one. 045 * <P> 046 * 047 * Sun decided not to use standard Introspection patterns so that these 048 * methods did not get included when the Introspector made its sweep on 049 * the class. 050 * 051 * @author John Keiser 052 * @since JDK1.1 053 * @version 1.1.0, 29 Jul 1998 054 */ 055 056public interface Visibility { 057 /** 058 * Tells whether the Bean can run without a GUI or not. 059 * @return false if Bean can run without a GUI, else true. 060 */ 061 boolean needsGui(); 062 063 /** 064 * Tells whether Bean is trying not to use the GUI. 065 * If needsGui() is true, this method should always return false. 066 * @return true if definitely not using GUI, otherwise false. 067 */ 068 boolean avoidingGui(); 069 070 /** 071 * Tells the Bean not to use GUI methods. 072 * If needsGUI() is false, then after this method is called, 073 * avoidingGui() should return true. 074 */ 075 void dontUseGui(); 076 077 /** 078 * Tells the Bean it may use the GUI. 079 * The Bean is not required to use the GUI in this case, it is 080 * merely being <EM>permitted</EM> to use it. If needsGui() is 081 * false, avoidingGui() may return true or false after this method 082 * is called. 083 */ 084 void okToUseGui(); 085}