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21 package org.apache.struts.chain.commands.servlet;
22
23 import java.io.IOException;
24
25 import org.apache.commons.logging.Log;
26 import org.apache.commons.logging.LogFactory;
27 import org.apache.struts.action.ActionServlet;
28 import org.apache.struts.chain.commands.AbstractPerformForward;
29 import org.apache.struts.chain.contexts.ActionContext;
30 import org.apache.struts.chain.contexts.ServletActionContext;
31 import org.apache.struts.config.ForwardConfig;
32 import org.apache.struts.config.ModuleConfig;
33 import org.apache.struts.util.MessageResources;
34 import org.apache.struts.util.RequestUtils;
35 import org.apache.struts.util.ModuleUtils;
36
37 import javax.servlet.RequestDispatcher;
38 import javax.servlet.ServletContext;
39 import javax.servlet.ServletException;
40 import javax.servlet.http.HttpServletRequest;
41 import javax.servlet.http.HttpServletResponse;
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48
49 public class PerformForward extends AbstractPerformForward {
50 private static final Log LOG = LogFactory.getLog(PerformForward.class);
51
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59
60
61 protected void perform(ActionContext context, ForwardConfig forwardConfig)
62 throws Exception {
63 ServletActionContext sacontext = (ServletActionContext) context;
64 String uri = forwardConfig.getPath();
65
66 if (uri == null) {
67 ActionServlet servlet = sacontext.getActionServlet();
68 MessageResources resources = servlet.getInternal();
69
70 throw new IllegalArgumentException(resources.getMessage("forwardPathNull"));
71 }
72
73 HttpServletRequest request = sacontext.getRequest();
74 ServletContext servletContext = sacontext.getContext();
75 HttpServletResponse response = sacontext.getResponse();
76
77
78 String actionIdPath = RequestUtils.actionIdURL(forwardConfig, sacontext.getRequest(), sacontext.getActionServlet());
79 if (actionIdPath != null) {
80 uri = actionIdPath;
81 ForwardConfig actionIdForwardConfig = new ForwardConfig(forwardConfig);
82 actionIdForwardConfig.setPath(actionIdPath);
83 forwardConfig = actionIdForwardConfig;
84 }
85
86 if (uri.startsWith("/")) {
87 uri = resolveModuleRelativePath(forwardConfig, servletContext, request);
88 }
89
90
91 if (response.isCommitted() && !forwardConfig.getRedirect()) {
92 handleAsInclude(uri, servletContext, request, response);
93 } else if (forwardConfig.getRedirect()) {
94 handleAsRedirect(uri, request, response);
95 } else {
96 handleAsForward(uri, servletContext, request, response);
97 }
98 }
99
100 private String resolveModuleRelativePath(ForwardConfig forwardConfig, ServletContext servletContext, HttpServletRequest request) {
101 String prefix = forwardConfig.getModule();
102 ModuleConfig moduleConfig = ModuleUtils.getInstance().getModuleConfig(prefix, request, servletContext);
103 return RequestUtils.forwardURL(request,forwardConfig, moduleConfig);
104 }
105
106 private void handleAsForward(String uri, ServletContext servletContext, HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
107 RequestDispatcher rd = servletContext.getRequestDispatcher(uri);
108
109 if (LOG.isDebugEnabled()) {
110 LOG.debug("Forwarding to " + uri);
111 }
112
113 rd.forward(request, response);
114 }
115
116 private void handleAsRedirect(String uri, HttpServletRequest request, HttpServletResponse response) throws IOException {
117 if (uri.startsWith("/")) {
118 uri = request.getContextPath() + uri;
119 }
120
121 if (LOG.isDebugEnabled()) {
122 LOG.debug("Redirecting to " + uri);
123 }
124
125 response.sendRedirect(response.encodeRedirectURL(uri));
126 }
127
128 private void handleAsInclude(String uri, ServletContext servletContext, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
129 RequestDispatcher rd = servletContext.getRequestDispatcher(uri);
130
131 if (rd == null) {
132 response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
133 "Error getting RequestDispatcher for " + uri);
134 return;
135 }
136
137 if (LOG.isDebugEnabled()) {
138 LOG.debug("Including " + uri);
139 }
140
141 rd.include(request, response);
142 }
143 }