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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/java/beans/beancontext/BeanContextChildSupport.java
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+/* java.beans.beancontext.BeanContextChildSupport
+ 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.PropertyChangeEvent;
+import java.beans.PropertyChangeListener;
+import java.beans.PropertyChangeSupport;
+import java.beans.PropertyVetoException;
+import java.beans.VetoableChangeListener;
+import java.beans.VetoableChangeSupport;
+import java.io.Serializable;
+
+/**
+ * Support for creating a <code>BeanContextChild</code>.
+ * This class contains the most common implementations of the methods in
+ * the <code>BeanContextChild</code>
+ *
+ * @specnote This class is not very well specified. I had to "fill in the
+ * blanks" in most places with what I thought was reasonable
+ * behavior. If there are problems, let me know.
+ *
+ * @author John Keiser
+ * @since 1.2
+ * @see java.beans.beancontext.BeanContextChild
+ */
+public class BeanContextChildSupport
+ implements BeanContextChild, BeanContextServicesListener, Serializable
+{
+ static final long serialVersionUID = 6328947014421475877L;
+
+ /**
+ * The peer on which to perform <code>set</code> actions.
+ * This is here so that this class can be used as a peer.
+ * <P>
+ *
+ * When extending this class, this variable will be set to
+ * <code>this</code>.
+ */
+ public BeanContextChild beanContextChildPeer;
+
+ /**
+ * The parent <code>BeanContext</code>.
+ */
+ protected transient BeanContext beanContext;
+
+ /**
+ * If <code>setBeanContext()</code> was vetoed once before, this
+ * is set to <code>true</code> so that the next time, vetoes will
+ * be ignored.
+ */
+ protected transient boolean rejectedSetBCOnce;
+
+ /**
+ * Listeners are registered here and events are fired through here.
+ */
+ protected PropertyChangeSupport pcSupport;
+
+ /**
+ * Listeners are registered here and events are fired through here.
+ */
+ protected VetoableChangeSupport vcSupport;
+
+ /**
+ * Create a new <code>BeanContextChildSupport</code> with itself as the peer.
+ * This is meant to be used when you subclass
+ * <code>BeanContextChildSupport</code> to create your child.
+ */
+ public BeanContextChildSupport()
+ {
+ this (null);
+ }
+
+ /**
+ * Create a new <code>BeanContextChildSupport</code> with the specified peer.
+ * @param peer the peer to use, or <code>null</code> to specify
+ * <code>this</code>.
+ */
+ public BeanContextChildSupport (BeanContextChild peer)
+ {
+ if (peer == null)
+ {
+ peer = this;
+ }
+
+ beanContextChildPeer = peer;
+ pcSupport = new PropertyChangeSupport (peer);
+ vcSupport = new VetoableChangeSupport (peer);
+ }
+
+ /**
+ * Set the parent <code>BeanContext</code>.
+ * <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>
+ *
+ * Order of events:
+ * <OL>
+ * <LI>
+ * If the new <code>BeanContext</code> is the same as the old
+ * one, nothing happens.
+ * </LI>
+ * <LI>
+ * If the change has not been rejected or vetoed before, call
+ * <code>validatePendingSetBeanContext()</code>. If this call
+ * returns <code>false</code>, the change is rejected and a
+ * <code>PropertyVetoException</code> is thrown.
+ * </LI>
+ * <LI>
+ * If the change has not been rejected or vetoed before,
+ * <code>VetoableChangeEvent</code>s are fired with the name
+ * <code>"beanContext"</code>, using the
+ * <code>fireVetoableChange()</code> method. If a veto
+ * occurs, reversion events are fired using the same method,
+ * the change is rejected, and the veto is rethrown.
+ * </LI>
+ * <LI>
+ * <code>releaseBeanContextResources()</code> is called.
+ * </LI>
+ * <LI>
+ * The change is made.
+ * </LI>
+ * <LI>
+ * <code>PropertyChangeEvent</code>s are fired using the
+ * <code>firePropertyChange()</code> method.
+ * </LI>
+ * <LI>
+ * <code>initializeBeanContextResources()</code> is called.
+ * </LI>
+ * </OL>
+ * <P>
+ *
+ * @param newBeanContext 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.
+ */
+ public void setBeanContext(BeanContext newBeanContext)
+ throws PropertyVetoException
+ {
+ synchronized (beanContextChildPeer)
+ {
+ if (newBeanContext == beanContext)
+ return;
+
+ if (!rejectedSetBCOnce)
+ {
+ if (!validatePendingSetBeanContext (newBeanContext))
+ {
+ rejectedSetBCOnce = true;
+ throw new PropertyVetoException ("validatePendingSetBeanContext() rejected change",
+ new PropertyChangeEvent(beanContextChildPeer, "beanContext", beanContext, newBeanContext));
+ }
+
+ try
+ {
+ fireVetoableChange ("beanContext", beanContext, newBeanContext);
+ }
+ catch (PropertyVetoException e)
+ {
+ rejectedSetBCOnce = true;
+ throw e;
+ }
+ }
+
+ releaseBeanContextResources ();
+
+ beanContext = newBeanContext;
+ rejectedSetBCOnce = false;
+
+ firePropertyChange ("beanContext", beanContext, newBeanContext);
+
+ initializeBeanContextResources ();
+ }
+ }
+
+ /**
+ * Get the parent <code>BeanContext</code>.
+ * @return the parent <code>BeanContext</code>.
+ */
+ public BeanContext getBeanContext()
+ {
+ return beanContext;
+ }
+
+ /**
+ * Get the peer (or <code>this</code> if there is no peer).
+ * @return the peer, or <code>this</code> if there is no peer.
+ */
+ public BeanContextChild getBeanContextChildPeer() {
+ return beanContextChildPeer;
+ }
+
+ /**
+ * Determine whether there is a peer.
+ * This is true iff <code>getBeanContextChildPeer() == this</code>.
+ * @return whether there is a peer.
+ */
+ public boolean isDelegated() {
+ return beanContextChildPeer == this;
+ }
+
+ /**
+ * Add a listener that will be notified when a specific property changes.
+ * @param propertyName the name of the property to listen on.
+ * @param listener the listener to listen on the property.
+ */
+ public void addPropertyChangeListener(String propertyName, PropertyChangeListener listener) {
+ pcSupport.addPropertyChangeListener(propertyName, listener);
+ }
+
+ /**
+ * Remove a listener to a certain property.
+ *
+ * @param propertyName the name of the property being listened on.
+ * @param listener the listener listening on the property.
+ */
+ public void removePropertyChangeListener(String propertyName, PropertyChangeListener listener) {
+ pcSupport.removePropertyChangeListener(propertyName, 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 propertyName the name of the property to listen on.
+ * @param listener the listener to listen on the property.
+ */
+ public void addVetoableChangeListener(String propertyName, VetoableChangeListener listener) {
+ vcSupport.addVetoableChangeListener(propertyName, listener);
+ }
+
+ /**
+ * Remove a listener to a certain property.
+ *
+ * @param propertyName the name of the property being listened on
+ * @param listener the listener listening on the property.
+ */
+ public void removeVetoableChangeListener(String propertyName, VetoableChangeListener listener) {
+ vcSupport.removeVetoableChangeListener(propertyName, listener);
+ }
+
+ /**
+ * Fire a property change.
+ *
+ * @param propertyName the name of the property that changed
+ * @param oldVal the old value of the property
+ * @param newVal the new value of the property
+ */
+ public void firePropertyChange(String propertyName, Object oldVal, Object newVal) {
+ pcSupport.firePropertyChange(propertyName, oldVal, newVal);
+ }
+
+ /**
+ * Fire a vetoable property change.
+ *
+ * @param propertyName the name of the property that changed
+ * @param oldVal the old value of the property
+ * @param newVal the new value of the property
+ * @exception PropertyVetoException if the change is vetoed.
+ */
+ public void fireVetoableChange(String propertyName, Object oldVal, Object newVal)
+ throws PropertyVetoException {
+ vcSupport.fireVetoableChange(propertyName, oldVal, newVal);
+ }
+
+ /**
+ * Called by <code>BeanContextServices.revokeService()</code> to indicate that a service has been revoked.
+ * If you have a reference to such a service, it should be
+ * discarded and may no longer function properly.
+ * <code>getService()</code> will no longer work on the specified
+ * service class after this event has been fired.
+ * <P>
+ *
+ * <EM>This method is meant to be overriden.</EM>
+ * <code>BeanContextChildSupport</code>'s implementation does
+ * nothing.
+ *
+ * @param event the service revoked event.
+ * @see java.beans.beancontext.BeanContextServices#revokeService(java.lang.Class,java.beans.beancontext.BeanContextServiceProvider,boolean)
+ */
+ public void serviceRevoked(BeanContextServiceRevokedEvent event) {
+ }
+
+ /**
+ * Called by <code>BeanContextServices</code> whenever a service is made available.
+ * <P>
+ *
+ * <EM>This method is meant to be overriden.</EM>
+ * <code>BeanContextChildSupport</code>'s implementation does
+ * nothing.
+ *
+ * @param event the service revoked event, with useful information
+ * about the new service.
+ */
+ public void serviceAvailable(BeanContextServiceAvailableEvent event) {
+ }
+
+ /**
+ * Called by <code>setBeanContext()</code> to determine whether the set should be rejected.
+ * <P>
+ *
+ * <EM>This method is meant to be overriden.</EM>
+ * <code>BeanContextChildSupport</code>'s implementation simply
+ * returns <code>true</code>.
+ *
+ * @param newBeanContext the new parent.
+ * @return whether to allow the parent to be changed to the new
+ * value.
+ */
+ public boolean validatePendingSetBeanContext(BeanContext newBeanContext) {
+ return true;
+ }
+
+ /**
+ * Called by <code>setBeanContext()</code> to release resources of a what will soon no longer be the parent.
+ * <P>
+ *
+ * <EM>This method is meant to be overriden.</EM>
+ * <code>BeanContextChildSupport</code>'s implementation does
+ * nothing.
+ */
+ protected void releaseBeanContextResources() {
+ }
+
+ /**
+ * Called by <code>setBeanContext()</code> to grab resources when the parent has been set.
+ * <P>
+ *
+ * <EM>This method is meant to be overriden.</EM>
+ * <code>BeanContextChildSupport</code>'s implementation does
+ * nothing.
+ */
+ protected void initializeBeanContextResources() {
+ }
+}