DeletionDecorator.java

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2010-2012 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package org.glassfish.config.support;

import org.glassfish.api.admin.AdminCommandContext;

import org.jvnet.hk2.annotations.Service;
import org.glassfish.hk2.api.PerLookup;
import org.jvnet.hk2.config.ConfigBeanProxy;
import org.jvnet.hk2.config.TransactionFailure;

import java.beans.PropertyVetoException;

/**
 * A decorator for acting upon a configuration element deletion.
 *
 * @param <T> the deleted element parent type
 * @param <U> the deleted element
 *
 * @author Jerome Dochez
 */
@PerLookup
public interface DeletionDecorator<T extends ConfigBeanProxy, U extends ConfigBeanProxy> {

    /**
     * notification of a configuration element of type U deletion.
     * 
     * Note that this notification is called within the boundaries of the
     * configuration transaction, therefore the parent instance is a
     * writable copy and further changes to the parent can be made without
     * enrolling it inside a transaction.
     *
     * @param context the command context to lead to the element deletion
     * @param parent the parent instance the element was removed from
     * @param child the deleted instance
     */
    public void decorate(AdminCommandContext context, T parent, U child) throws TransactionFailure, PropertyVetoException;

    @Service
    public static class NoDecoration implements DeletionDecorator<ConfigBeanProxy, ConfigBeanProxy> {
        @Override
        public void decorate(AdminCommandContext context, ConfigBeanProxy parent, ConfigBeanProxy child) throws TransactionFailure, PropertyVetoException {
            // do nothing.
        }
    }
}