| /* |
| * Copyright (c) 1998, 2020 Oracle and/or its affiliates. All rights reserved. |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Public License v. 2.0 which is available at |
| * http://www.eclipse.org/legal/epl-2.0, |
| * or the Eclipse Distribution License v. 1.0 which is available at |
| * http://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause |
| */ |
| |
| // Contributors: |
| // Oracle - initial API and implementation from Oracle TopLink |
| package org.eclipse.persistence.internal.descriptors.changetracking; |
| |
| import java.beans.*; |
| import org.eclipse.persistence.internal.sessions.UnitOfWorkImpl; |
| import org.eclipse.persistence.descriptors.ClassDescriptor; |
| |
| /** |
| * <p> |
| * <b>Purpose</b>: Define a listener for attribute change tracking. |
| * <p> |
| * <b>Description</b>: Listener is notified on a PropertyChangeEvent from the object it belongs to. |
| * <p> |
| * <b>Responsibilities</b>: Set the flag to true and build ObjectChangeSet that includes the |
| * ChangeRecords for the changed attributes. |
| */ |
| public class AggregateAttributeChangeListener extends AttributeChangeListener { |
| |
| //Used when the current ChangeListener is within an Aggregate. |
| protected AttributeChangeListener parentListener; |
| protected String parentAttributeName; |
| |
| /** |
| * Create a AttributeChangeListener with a descriptor and unit of work |
| */ |
| public AggregateAttributeChangeListener(ClassDescriptor descriptor, UnitOfWorkImpl uow, AttributeChangeListener parentListener, String parentAttribute, Object owner) { |
| super(descriptor, uow, owner); |
| this.parentListener = parentListener; |
| this.parentAttributeName = parentAttribute; |
| } |
| |
| /** |
| * This method creates the object change set if necessary. It also creates/updates |
| * the change record based on the new value. Object should check the if newValue and |
| * oldValue are identical. If they are identical, do not create PropertyChangeEvent |
| * and call this method. |
| */ |
| @Override |
| public void internalPropertyChange(PropertyChangeEvent evt) { |
| super.internalPropertyChange(evt); |
| // Also need to raise the event in the parent, to create a change set for it. |
| // Only raise the event in parent if something actually changed. |
| if (this.objectChangeSet != null && this.parentListener != null) { |
| if (evt.getSource() == owner){ |
| this.parentListener.internalPropertyChange(new PropertyChangeEvent(evt.getSource(), parentAttributeName, evt.getOldValue(), evt.getNewValue())); |
| } else { |
| // the event's source is not the owner of this change tracking policy - this is a nested aggregate change. |
| this.parentListener.internalPropertyChange(new PropertyChangeEvent(owner, parentAttributeName, evt.getOldValue(), evt.getNewValue())); |
| } |
| } |
| } |
| /** |
| * Used to control the parent listener; |
| */ |
| public void setParentListener(AttributeChangeListener listener){ |
| this.parentListener = listener; |
| } |
| } |