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+/* java.beans.beancontext.BeanContextChild
+   Copyright (C) 1999 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath 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 for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package java.beans.beancontext;
+
+import java.beans.PropertyChangeListener;
+import java.beans.PropertyVetoException;
+import java.beans.VetoableChangeListener;
+
+/**
+ * Beans implement this to get information about the execution environment and
+ * its services and to be placed in the hierarchy.
+ * <P>
+ *
+ * The difference between a <code>BeanContext</code> and a
+ * <code>BeanContextChild</code>, mainly, is that a
+ * <code>BeanContext</code> may be a parent.
+ * <P>
+ *
+ * <code>BeanContextChild</code> instances will be serialized at some
+ * point in their life, but you need to make sure your bean context does
+ * not contain a serializable reference (directly or indirectly) to the
+ * parent <code>BeanContext</code>, to any of the other
+ * <code>BeanContext</code>s in the tree, or to any resources obtained
+ * via the <code>BeanContextServices</code> interface.  One way to do this
+ * is to mark any fields that contain such references as
+ * <code>transient</code>.  Another way is to use a custom serializer.
+ * <P>
+ *
+ * If you do not do this, when the <code>BeanContext</code> is serialized,
+ * all the other <code>BeanContext</code>s and other unnecessary things
+ * will be serialized along with it.
+ * <P>
+ *
+ * Before dying, a <code>BeanContextChild</code> should call
+ * <code>getBeanContext().remove(this)</code> to detach from the
+ * hierarchy and exit cleanly.
+ *
+ * @author John Keiser
+ * @since JDK1.2
+ * @see java.beans.beancontext.BeanContext
+ */
+
+public interface BeanContextChild {
+        /**
+         * Set the parent <code>BeanContext</code>.
+         * <P>
+         *
+         * This method is called from <code>BeanContext.add()</code> and
+         * should not be called directly.
+         * <P>
+         *
+         * When this Object is being added to a new BeanContext or moved
+         * from an old one, a non-null value will be passed in.
+         * <P>
+         *
+         * When this Object is being removed from the current
+         * <code>BeanContext</code>, <code>setBeanContext()</code> will
+         * receive the parameter <code>null</code>.
+         * <P>
+         *
+         * When being removed from the current <code>BeanContext</code>,
+         * it is the <code>BeanContextChild</code>'s responsibility to
+         * release all services it has obtained.
+         * <P>
+         *
+         * This change should generate <code>PropertyChangeEvent</code>
+         * and <code>VetoableChangeEvent</code>s with the property name
+         * "beanContext".  If the change is vetoed, it must re-throw the
+         * exception and not change anything.  In this way, the parent
+         * <code>BeanContextChild</code>, who has registered himself with
+         * you, will have a chance to remove this child from its
+         * collection.
+         * <P>
+         *
+         * If the Bean does not wish to change the parent or be removed
+         * from one, it may throw the <code>PropertyVetoException</code>.
+         * If you veto a <code>setBeanContext(null)</code> call, then you
+         * should try your hardest to remedy whatever problem is keeping
+         * you from being removed from the <code>BeanContext</code> so
+         * that you can <em>not</em> veto it the next time.
+         * Otherwise, nasty pathological recursion stuff could occur in
+         * certain situations.
+         * <P>
+         *
+         * If you do veto the change, you must first back out any changes
+         * you made prior to the veto.  Best not to make any such changes
+         * prior to the veto in the first place.
+         * <P>
+         *
+         * This method is called from <code>BeanContext.add()</code> and
+         * should not be called directly.
+         *
+         * @param parent the new parent for the <code>BeanContextChild</code>,
+         *        or <code>null</code> to signify removal from a tree.
+         * @exception PropertyVetoException if the
+         *            <code>BeanContextChild</code> implementor does not
+         *            wish to have its parent changed.
+         */
+        void setBeanContext(BeanContext parent)
+                throws PropertyVetoException;
+
+        /**
+         * Get the parent <code>BeanContext</code>.
+         * @return the parent <code>BeanContext</code>.
+         */
+        BeanContext getBeanContext();
+
+        /**
+         * Add a listener that will be notified when a specific property changes.
+         * @param prop the name of the property to listen on
+         * @param listener the listener to listen on the property.
+         */
+        void addPropertyChangeListener(String prop, PropertyChangeListener listener);
+
+        /**
+         * Remove a listener to a certain property.
+         * @param prop the name of the property being listened on
+         * @param listener the listener listening on the property.
+         */
+        void removePropertyChangeListener(String prop, PropertyChangeListener listener);
+
+        /**
+         * Add a listener that will be notified when a specific property
+         * change is requested (a PropertyVetoException may be thrown) as
+         * well as after the change is successfully made.
+         *
+         * @param prop the name of the property to listen on
+         * @param listener the listener to listen on the property.
+         */
+        void addVetoableChangeListener(String prop, VetoableChangeListener listener);
+
+        /**
+         * Remove a listener to a certain property.
+         * @param prop the name of the property being listened on
+         * @param listener the listener listening on the property.
+         */
+        void removeVetoableChangeListener(String prop, VetoableChangeListener listener);
+}