TaskExecutionDecorator.java

/**
 * Copyright (C) 2009 eXo Platform SAS.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.exoplatform.portal.pom.config;

/**
 * @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a>
 * @version $Revision$
 */
public class TaskExecutionDecorator implements TaskExecutor {

    /** . */
    private final TaskExecutor next;

    public TaskExecutionDecorator(TaskExecutor next) {
        this.next = next;
    }

    public <V> V execute(POMSession session, POMTask<V> task) throws Exception {
        return next.execute(session, task);
    }

    public <E extends TaskExecutor> E getDecorator(Class<E> decoratorClass) {
        if (decoratorClass.isInstance(this)) {
            return decoratorClass.cast(this);
        } else {
            if (next != null && next instanceof TaskExecutionDecorator) {
                return ((TaskExecutionDecorator) next).getDecorator(decoratorClass);
            } else {
                return null;
            }
        }
    }
}