Source Code Cross Referenced for ServletDispatcherResult.java in  » Web-Framework » struts-2.0.11 » org » apache » struts2 » dispatcher » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Framework » struts 2.0.11 » org.apache.struts2.dispatcher 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $Id: ServletDispatcherResult.java 471756 2006-11-06 15:01:43Z husted $
003:         *
004:         * Licensed to the Apache Software Foundation (ASF) under one
005:         * or more contributor license agreements.  See the NOTICE file
006:         * distributed with this work for additional information
007:         * regarding copyright ownership.  The ASF licenses this file
008:         * to you under the Apache License, Version 2.0 (the
009:         * "License"); you may not use this file except in compliance
010:         * with the License.  You may obtain a copy of the License at
011:         *
012:         *  http://www.apache.org/licenses/LICENSE-2.0
013:         *
014:         * Unless required by applicable law or agreed to in writing,
015:         * software distributed under the License is distributed on an
016:         * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017:         * KIND, either express or implied.  See the License for the
018:         * specific language governing permissions and limitations
019:         * under the License.
020:         */
021:        package org.apache.struts2.dispatcher;
022:
023:        import javax.servlet.RequestDispatcher;
024:        import javax.servlet.http.HttpServletRequest;
025:        import javax.servlet.http.HttpServletResponse;
026:        import javax.servlet.jsp.PageContext;
027:
028:        import org.apache.commons.logging.Log;
029:        import org.apache.commons.logging.LogFactory;
030:        import org.apache.struts2.ServletActionContext;
031:
032:        import com.opensymphony.xwork2.ActionInvocation;
033:
034:        /**
035:         * <!-- START SNIPPET: description -->
036:         *
037:         * Includes or forwards to a view (usually a jsp). Behind the scenes Struts
038:         * will use a RequestDispatcher, where the target servlet/JSP receives the same
039:         * request/response objects as the original servlet/JSP. Therefore, you can pass
040:         * data between them using request.setAttribute() - the Struts action is
041:         * available.
042:         * <p/>
043:         * There are three possible ways the result can be executed:
044:         *
045:         * <ul>
046:         *
047:         * <li>If we are in the scope of a JSP (a PageContext is available), PageContext's
048:         * {@link PageContext#include(String) include} method is called.</li>
049:         *
050:         * <li>If there is no PageContext and we're not in any sort of include (there is no
051:         * "javax.servlet.include.servlet_path" in the request attributes), then a call to
052:         * {@link RequestDispatcher#forward(javax.servlet.ServletRequest, javax.servlet.ServletResponse) forward}
053:         * is made.</li>
054:         *
055:         * <li>Otherwise, {@link RequestDispatcher#include(javax.servlet.ServletRequest, javax.servlet.ServletResponse) include}
056:         * is called.</li>
057:         *
058:         * </ul>
059:         * <!-- END SNIPPET: description -->
060:         *
061:         * <b>This result type takes the following parameters:</b>
062:         *
063:         * <!-- START SNIPPET: params -->
064:         *
065:         * <ul>
066:         *
067:         * <li><b>location (default)</b> - the location to go to after execution (ex. jsp).</li>
068:         *
069:         * <li><b>parse</b> - true by default. If set to false, the location param will not be parsed for Ognl expressions.</li>
070:         *
071:         * </ul>
072:         *
073:         * <!-- END SNIPPET: params -->
074:         *
075:         * <b>Example:</b>
076:         *
077:         * <pre><!-- START SNIPPET: example -->
078:         * &lt;result name="success" type="dispatcher"&gt;
079:         *   &lt;param name="location"&gt;foo.jsp&lt;/param&gt;
080:         * &lt;/result&gt;
081:         * <!-- END SNIPPET: example --></pre>
082:         *
083:         * This result follows the same rules from {@link StrutsResultSupport}.
084:         *
085:         * @see javax.servlet.RequestDispatcher
086:         */
087:        public class ServletDispatcherResult extends StrutsResultSupport {
088:
089:            private static final long serialVersionUID = -1970659272360685627L;
090:
091:            private static final Log log = LogFactory
092:                    .getLog(ServletDispatcherResult.class);
093:
094:            public ServletDispatcherResult() {
095:                super ();
096:            }
097:
098:            public ServletDispatcherResult(String location) {
099:                super (location);
100:            }
101:
102:            /**
103:             * Dispatches to the given location. Does its forward via a RequestDispatcher. If the
104:             * dispatch fails a 404 error will be sent back in the http response.
105:             *
106:             * @param finalLocation the location to dispatch to.
107:             * @param invocation    the execution state of the action
108:             * @throws Exception if an error occurs. If the dispatch fails the error will go back via the
109:             *                   HTTP request.
110:             */
111:            public void doExecute(String finalLocation,
112:                    ActionInvocation invocation) throws Exception {
113:                if (log.isDebugEnabled()) {
114:                    log.debug("Forwarding to location " + finalLocation);
115:                }
116:
117:                PageContext pageContext = ServletActionContext.getPageContext();
118:
119:                if (pageContext != null) {
120:                    pageContext.include(finalLocation);
121:                } else {
122:                    HttpServletRequest request = ServletActionContext
123:                            .getRequest();
124:                    HttpServletResponse response = ServletActionContext
125:                            .getResponse();
126:                    RequestDispatcher dispatcher = request
127:                            .getRequestDispatcher(finalLocation);
128:
129:                    // if the view doesn't exist, let's do a 404
130:                    if (dispatcher == null) {
131:                        response.sendError(404, "result '" + finalLocation
132:                                + "' not found");
133:
134:                        return;
135:                    }
136:
137:                    // If we're included, then include the view
138:                    // Otherwise do forward
139:                    // This allow the page to, for example, set content type
140:                    if (!response.isCommitted()
141:                            && (request
142:                                    .getAttribute("javax.servlet.include.servlet_path") == null)) {
143:                        request.setAttribute("struts.view_uri", finalLocation);
144:                        request.setAttribute("struts.request_uri", request
145:                                .getRequestURI());
146:
147:                        dispatcher.forward(request, response);
148:                    } else {
149:                        dispatcher.include(request, response);
150:                    }
151:                }
152:            }
153:        }
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