Struts example source code file (StrutsExecuteFilter.java)

This example Struts source code file (StrutsExecuteFilter.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

actionmapping, executeoperations, filterchain, http, httpservletrequest, httpservletresponse, httpservletresponse, initoperations, initoperations, integer, integer, io, ioexception, prepareoperations, request, response, servlet, servletexception, servletexception

The Struts StrutsExecuteFilter.java source code

/*
 * $Id: DefaultActionSupport.java 651946 2008-04-27 13:41:38Z apetrelli $
 *
 * 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.dispatcher.ng.filter;

import org.apache.struts2.StrutsStatics;
import org.apache.struts2.dispatcher.Dispatcher;
import org.apache.struts2.dispatcher.ng.PrepareOperations;
import org.apache.struts2.dispatcher.ng.ExecuteOperations;
import org.apache.struts2.dispatcher.ng.InitOperations;
import org.apache.struts2.dispatcher.mapper.ActionMapping;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * Executes the discovered request information.  This filter requires the {@link StrutsPrepareFilter} to have already
 * been executed in the current chain.
 */
public class StrutsExecuteFilter implements StrutsStatics, Filter {
    protected PrepareOperations prepare;
    protected ExecuteOperations execute;

    protected FilterConfig filterConfig;

    public void init(FilterConfig filterConfig) throws ServletException {
        this.filterConfig = filterConfig;
    }

    protected synchronized void lazyInit() {
        if (execute == null) {
            InitOperations init = new InitOperations();
            Dispatcher dispatcher = init.findDispatcherOnThread();
            init.initStaticContentLoader(new FilterHostConfig(filterConfig), dispatcher);

            prepare = new PrepareOperations(filterConfig.getServletContext(), dispatcher);
            execute = new ExecuteOperations(filterConfig.getServletContext(), dispatcher);
        }

    }

    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) res;

		if (excludeUrl(request)) {
			chain.doFilter(request, response);
			return;
		}

        // This is necessary since we need the dispatcher instance, which was created by the prepare filter
		if (execute == null) {
			lazyInit();
		}

        ActionMapping mapping = prepare.findActionMapping(request, response);

        //if recusrion counter is > 1, it means we are in a "forward", in that case a mapping will still be
        //in the request, if we handle it, it will lead to an infinte loop, see WW-3077
        Integer recursionCounter = (Integer) request.getAttribute(PrepareOperations.CLEANUP_RECURSION_COUNTER);

        if (mapping == null || recursionCounter > 1) {
            boolean handled = execute.executeStaticResourceRequest(request, response);
            if (!handled) {
                chain.doFilter(request, response);
            }
        } else {
            execute.executeAction(request, response, mapping);
        }
    }

	private boolean excludeUrl(HttpServletRequest request) {
		return request.getAttribute(StrutsPrepareFilter.REQUEST_EXCLUDED_FROM_ACTION_MAPPING) != null;
	}

    public void destroy() {
        prepare = null;
        execute = null;
        filterConfig = null;
    }
}