AbstractChainableStage.java

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 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
 * http://glassfish.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.jersey.process.internal;

/**
 * Abstract chainable linear acceptor.
 *
 * Implements support for managing the default next stage value.
 *
 * @param <DATA> processed data type.
 * @author Marek Potociar (marek.potociar at oracle.com)
 */
public abstract class AbstractChainableStage<DATA> implements ChainableStage<DATA> {

    private Stage<DATA> nextStage;

    /**
     * Create a new chainable acceptor with no next stage set.
     */
    protected AbstractChainableStage() {
        this(null);
    }

    /**
     * Create a new chainable acceptor with an initialized default
     * next stage value.
     *
     * @param nextStage default next stage.
     */
    protected AbstractChainableStage(Stage<DATA> nextStage) {
        this.nextStage = nextStage;
    }

    @Override
    public final void setDefaultNext(Stage<DATA> next) {
        this.nextStage = next;
    }

    /**
     * Get the default next stage currently configured on the acceptor.
     *
     * @return default next stage currently configured on the acceptor.
     */
    public final Stage<DATA> getDefaultNext() {
        return nextStage;
    }
}