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