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16 package org.apache.struts.chain.commands.servlet;
17
18 import java.io.IOException;
19
20 import org.apache.commons.logging.Log;
21 import org.apache.commons.logging.LogFactory;
22 import org.apache.struts.action.ActionServlet;
23 import org.apache.struts.chain.commands.AbstractPerformForward;
24 import org.apache.struts.chain.contexts.ActionContext;
25 import org.apache.struts.chain.contexts.ServletActionContext;
26 import org.apache.struts.config.ForwardConfig;
27 import org.apache.struts.config.ModuleConfig;
28 import org.apache.struts.util.MessageResources;
29 import org.apache.struts.util.RequestUtils;
30 import org.apache.struts.util.ModuleUtils;
31
32 import javax.servlet.RequestDispatcher;
33 import javax.servlet.ServletContext;
34 import javax.servlet.ServletException;
35 import javax.servlet.http.HttpServletRequest;
36 import javax.servlet.http.HttpServletResponse;
37
38 /***
39 * <p>Perform forwarding or redirection based on the specified
40 * <code>ForwardConfig</code> (if any).</p>
41 *
42 * @version $Rev: 421119 $ $Date: 2006-07-11 21:49:11 -0700 (Tue, 11 Jul 2006) $
43 */
44 public class PerformForward extends AbstractPerformForward {
45 private static final Log LOG = LogFactory.getLog(PerformForward.class);
46
47
48
49 /***
50 * <p>Perform the appropriate processing on the specified
51 * <code>ForwardConfig</code>.</p>
52 *
53 * @param context The context for this request
54 * @param forwardConfig The forward to be performed
55 */
56 protected void perform(ActionContext context, ForwardConfig forwardConfig)
57 throws Exception {
58 ServletActionContext sacontext = (ServletActionContext) context;
59 String uri = forwardConfig.getPath();
60
61 if (uri == null) {
62 ActionServlet servlet = sacontext.getActionServlet();
63 MessageResources resources = servlet.getInternal();
64
65 throw new IllegalArgumentException(resources.getMessage("forwardPathNull"));
66 }
67
68 HttpServletRequest request = sacontext.getRequest();
69 ServletContext servletContext = sacontext.getContext();
70 HttpServletResponse response = sacontext.getResponse();
71
72 if (uri.startsWith("/")) {
73 uri = resolveModuleRelativePath(forwardConfig, servletContext, request);
74 }
75
76
77 if (response.isCommitted() && !forwardConfig.getRedirect()) {
78 handleAsInclude(uri, servletContext, request, response);
79 } else if (forwardConfig.getRedirect()) {
80 handleAsRedirect(uri, request, response);
81 } else {
82 handleAsForward(uri, servletContext, request, response);
83 }
84 }
85
86 private String resolveModuleRelativePath(ForwardConfig forwardConfig, ServletContext servletContext, HttpServletRequest request) {
87 String prefix = forwardConfig.getModule();
88 ModuleConfig moduleConfig = ModuleUtils.getInstance().getModuleConfig(prefix, request, servletContext);
89 return RequestUtils.forwardURL(request,forwardConfig, moduleConfig);
90 }
91
92 private void handleAsForward(String uri, ServletContext servletContext, HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
93 RequestDispatcher rd = servletContext.getRequestDispatcher(uri);
94
95 if (LOG.isDebugEnabled()) {
96 LOG.debug("Forwarding to " + uri);
97 }
98
99 rd.forward(request, response);
100 }
101
102 private void handleAsRedirect(String uri, HttpServletRequest request, HttpServletResponse response) throws IOException {
103 if (uri.startsWith("/")) {
104 uri = request.getContextPath() + uri;
105 }
106
107 if (LOG.isDebugEnabled()) {
108 LOG.debug("Redirecting to " + uri);
109 }
110
111 response.sendRedirect(response.encodeRedirectURL(uri));
112 }
113
114 private void handleAsInclude(String uri, ServletContext servletContext, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
115 RequestDispatcher rd = servletContext.getRequestDispatcher(uri);
116
117 if (rd == null) {
118 response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
119 "Error getting RequestDispatcher for " + uri);
120 return;
121 }
122
123 if (LOG.isDebugEnabled()) {
124 LOG.debug("Including " + uri);
125 }
126
127 rd.include(request, response);
128 }
129 }