abstractrequestnocache.java.svn-base

MVC开源框架

/*
 * $Id$
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.struts.chain.commands;

import org.apache.struts.chain.contexts.ActionContext;
import org.apache.struts.config.ModuleConfig;

/**
 * <p>Check to see if the controller is configured to prevent caching, and if
 * so, request no cache flags to be set.</p>
 *
 * @version $Rev$ $Date: 2005-06-04 10:58:46 -0400 (Sat, 04 Jun 2005)
 *          $
 */
public abstract class AbstractRequestNoCache extends ActionCommandBase {
    // ---------------------------------------------------------- Public Methods

    /**
     * <p>Check to see if the controller is configured to prevent caching, and
     * if so, request no cache flags to be set.</p>
     *
     * @param actionCtx The <code>Context</code> for the current request
     * @return <code>false</code> so that processing continues
     * @throws Exception if thrown by the Action class
     */
    public boolean execute(ActionContext actionCtx)
        throws Exception {
        // Retrieve the ModuleConfig instance
        ModuleConfig moduleConfig = actionCtx.getModuleConfig();

        // If the module is configured for no caching, request no caching
        if (moduleConfig.getControllerConfig().getNocache()) {
            requestNoCache(actionCtx);
        }

        return (false);
    }

    // ------------------------------------------------------- Protected Methods

    /**
     * <p>Request no cache flags are set.</p>
     *
     * @param context The <code>Context</code> for this request
     */
    protected abstract void requestNoCache(ActionContext context);
}