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Struts example source code file (ServletConfigInterceptor.java)

This example Struts source code file (ServletConfigInterceptor.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Struts tags/keywords

http, httpservletrequest, httpservletrequest, httpservletresponse, parameteraware, parameteraware, principalaware, request, requestaware, response, servlet, servletcontext, servletcontext, servletcontextaware, servletrequestaware, servletresponseaware, servletresponseaware, sessionaware, util

The Struts ServletConfigInterceptor.java source code

/*
 * $Id: ServletConfigInterceptor.java 728521 2008-12-21 21:51:53Z nilsga $
 *
 * 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.struts2.interceptor;

import java.util.Map;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.StrutsStatics;
import org.apache.struts2.servlet.interceptor.ServletPrincipalProxy;
import org.apache.struts2.util.ServletContextAware;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;


/**
 * <!-- START SNIPPET: description -->
 *
 * An interceptor which sets action properties based on the interfaces an action implements. For example, if the action
 * implements {@link ParameterAware} then the action context's parameter map will be set on it.
 *
 * <p/> This interceptor is designed to set all properties an action needs if it's aware of servlet parameters, the
 * servlet context, the session, etc. Interfaces that it supports are:
 *
 * <ul>
 *
 * <li>{@link ServletContextAware}
 *
 * <li>{@link ServletRequestAware}
 *
 * <li>{@link ServletResponseAware}
 *
 * <li>{@link ParameterAware}
 *
 * <li>{@link RequestAware}
 *
 * <li>{@link SessionAware}
 *
 * <li>{@link ApplicationAware}
 *
 * <li>{@link PrincipalAware}
 *
 * </ul>
 *
 * <!-- END SNIPPET: description -->
 *
 * <p/> Interceptor parameters:
 *
 * <!-- START SNIPPET: parameters -->
 *
 * <ul>
 *
 * <li>None
 *
 * </ul>
 *
 * <!-- END SNIPPET: parameters -->
 *
 * <p/> Extending the interceptor:
 *
 * <p/>
 *
 * <!-- START SNIPPET: extending -->
 *
 * There are no known extension points for this interceptor.
 *
 * <!-- END SNIPPET: extending -->
 *
 * <p/> Example code:
 *
 * <pre>
 * <!-- START SNIPPET: example -->
 * <action name="someAction" class="com.examples.SomeAction">
 *     <interceptor-ref name="servletConfig"/>
 *     <interceptor-ref name="basicStack"/>
 *     <result name="success">good_result.ftl</result>
 * </action>
 * <!-- END SNIPPET: example -->
 * </pre>
 *
 * @see ServletContextAware
 * @see ServletRequestAware
 * @see ServletResponseAware
 * @see ParameterAware
 * @see SessionAware
 * @see ApplicationAware
 * @see PrincipalAware
 */
public class ServletConfigInterceptor extends AbstractInterceptor implements StrutsStatics {

    private static final long serialVersionUID = 605261777858676638L;

    /**
     * Sets action properties based on the interfaces an action implements. Things like application properties,
     * parameters, session attributes, etc are set based on the implementing interface.
     *
     * @param invocation an encapsulation of the action execution state.
     * @throws Exception if an error occurs when setting action properties.
     */
    public String intercept(ActionInvocation invocation) throws Exception {
        final Object action = invocation.getAction();
        final ActionContext context = invocation.getInvocationContext();

        if (action instanceof ServletRequestAware) {
            HttpServletRequest request = (HttpServletRequest) context.get(HTTP_REQUEST);
            ((ServletRequestAware) action).setServletRequest(request);
        }

        if (action instanceof ServletResponseAware) {
            HttpServletResponse response = (HttpServletResponse) context.get(HTTP_RESPONSE);
            ((ServletResponseAware) action).setServletResponse(response);
        }

        if (action instanceof ParameterAware) {
            ((ParameterAware) action).setParameters((Map)context.getParameters());
        }

        if (action instanceof ApplicationAware) {
            ((ApplicationAware) action).setApplication(context.getApplication());
        }
        
        if (action instanceof SessionAware) {
            ((SessionAware) action).setSession(context.getSession());
        }
        
        if (action instanceof RequestAware) {
            ((RequestAware) action).setRequest((Map) context.get("request"));
        }

        if (action instanceof PrincipalAware) {
            HttpServletRequest request = (HttpServletRequest) context.get(HTTP_REQUEST);
            if(request != null) {
                // We are in servtlet environment, so principal information resides in HttpServletRequest
                ((PrincipalAware) action).setPrincipalProxy(new ServletPrincipalProxy(request));
            }
        }
        if (action instanceof ServletContextAware) {
            ServletContext servletContext = (ServletContext) context.get(SERVLET_CONTEXT);
            ((ServletContextAware) action).setServletContext(servletContext);
        }
        return invocation.invoke();
    }
}

Other Struts examples (source code examples)

Here is a short list of links related to this Struts ServletConfigInterceptor.java source code file:

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