core/src/main/java/org/apache/struts/chain/commands/AbstractPerformInclude.java

/*
 * $Id$
 *
 * 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>Perform forwarding or redirection based on the specified
 * <code>String</code> (if any).</p>
 *
 * @version $Rev$ $Date: 2005-06-04 10:58:46 -0400 (Sat, 04 Jun 2005)
 *          $
 */
public abstract class AbstractPerformInclude extends ActionCommandBase {
    // ---------------------------------------------------------- Public Methods

    /**
     * <p>Perform an include based on the specified include uri (if any).</p>
     *
     * @param actionCtx The <code>Context</code> for the current request
     * @return <code>true</code> so that processing completes
     * @throws Exception if thrown by the <code>Action</code>
     */
    public boolean execute(ActionContext actionCtx)
        throws Exception {

        // Is there an include to be performed?
        String include = actionCtx.getInclude();

        if (include == null) {
            return CONTINUE_PROCESSING;
        }

        // Determine the currect uri
        String uri = includePath(actionCtx, include);

        // Perform the appropriate processing on this include uri
        perform(actionCtx, uri);

        return PROCESSING_COMPLETE;
    }

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

    /**
     * <p>Returns the path to perform the include. Override this method to provide
     * a different path.</p>
     *
     * @param actionContext The context for this request
     * @param include The forward to be performed
     * @since Struts 1.3.6
     */
    protected String includePath(ActionContext actionContext, String include) {
        ModuleConfig moduleConfig = actionContext.getModuleConfig();
        return moduleConfig.getPrefix() + include;
    }

    /**
     * <p>Perform the appropriate processing on the specified include
     * uri.</p>
     *
     * @param context The context for this request
     * @param include The forward to be performed
     * @throws Exception if thrown by the <code>Action</code>
     */
    protected abstract void perform(ActionContext context, String include)
        throws Exception;
}