001 /* java.beans.DesignMode
002 Copyright (C) 1999, 2006, Free Software Foundation, Inc.
003
004 This file is part of GNU Classpath.
005
006 GNU Classpath is free software; you can redistribute it and/or modify
007 it under the terms of the GNU General Public License as published by
008 the Free Software Foundation; either version 2, or (at your option)
009 any later version.
010
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012 WITHOUT ANY WARRANTY; without even the implied warranty of
013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014 General Public License for more details.
015
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017 along with GNU Classpath; see the file COPYING. If not, write to the
018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
019 02110-1301 USA.
020
021 Linking this library statically or dynamically with other modules is
022 making a combined work based on this library. Thus, the terms and
023 conditions of the GNU General Public License cover the whole
024 combination.
025
026 As a special exception, the copyright holders of this library give you
027 permission to link this library with independent modules to produce an
028 executable, regardless of the license terms of these independent
029 modules, and to copy and distribute the resulting executable under
030 terms of your choice, provided that you also meet, for each linked
031 independent module, the terms and conditions of the license of that
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033 or based on this library. If you modify this library, you may extend
034 this exception to your version of the library, but you are not
035 obligated to do so. If you do not wish to do so, delete this
036 exception statement from your version. */
037
038
039 package java.beans;
040
041 /**
042 * <code>BeanContextChild</code> implementors implement this to get information
043 * about whether they are in a design time or runtime environment.
044 * The reason this is restricted to <code>BeanContextChild</code>ren is that
045 * only things in the <code>BeanContext</code> hierarchy are given this
046 * information in the first place.
047 *
048 * @author John Keiser
049 * @since JDK1.2
050 * @see java.beans.beancontext.BeanContextChild
051 */
052 public interface DesignMode
053 {
054
055 /**
056 * Use this name when firing <code>PropertyChangeEvent</code>s from your Bean.
057 */
058 String PROPERTYNAME = "designTime";
059
060 /**
061 * The environment will call this method on your
062 * <code>BeanContextChild</code> when it is registered in a parent
063 * <code>BeanContext</code> or when behavior needs to switch from
064 * design time to runtime behavior (or vice versa).
065 * <P>
066 *
067 * <code>BeanContext</code>s are required to fire
068 * <code>PropertyChangeEvent</code>s when properties change.
069 * <code>designTime</code> is a property, and therefore when you
070 * implement <code>setDesignTime()</code>, you need to fire a
071 * <code>PropertyChangeEvent</code> with the old value, the new
072 * value and using <code>PROPERTYNAME</code> as the property name.
073 *
074 * @param designTime the new value of design time,
075 * <code>true</code> if it is design time,
076 * <code>false</code> if it is runtime.
077 *
078 * @fixme I'm frankly not really sure whether it's the case that
079 * the BeanContext can <em>change</em> the status of the Bean from
080 * design time to runtime. But it appears that it may be so.
081 *
082 * @see java.beans.PropertyChangeEvent
083 * @see java.beans.beancontext.BeanContext
084 * @see #PROPERTYNAME
085 */
086 void setDesignTime(boolean designTime);
087
088 /**
089 * This method should tell whether it is design time or runtime.
090 * @return <code>true</code> if design time, <code>false</code> if
091 * runtime.
092 */
093 boolean isDesignTime();
094
095 }