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1   /*
2    * $Id: TagUtils.java 572226 2007-09-03 03:25:47Z mrdon $
3    *
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *  http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing,
15   * software distributed under the License is distributed on an
16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17   * KIND, either express or implied.  See the License for the
18   * specific language governing permissions and limitations
19   * under the License.
20   */
21  package org.apache.struts2.views.jsp;
22  
23  import java.util.Map;
24  
25  import javax.servlet.http.HttpServletRequest;
26  import javax.servlet.http.HttpServletResponse;
27  import javax.servlet.jsp.PageContext;
28  
29  import org.apache.struts2.RequestUtils;
30  import org.apache.struts2.ServletActionContext;
31  import org.apache.struts2.dispatcher.ApplicationMap;
32  import org.apache.struts2.dispatcher.Dispatcher;
33  import org.apache.struts2.dispatcher.RequestMap;
34  import org.apache.struts2.dispatcher.SessionMap;
35  import org.apache.struts2.dispatcher.mapper.ActionMapper;
36  import org.apache.struts2.dispatcher.mapper.ActionMapping;
37  import org.apache.struts2.util.AttributeMap;
38  
39  import com.opensymphony.xwork2.ActionContext;
40  import com.opensymphony.xwork2.ActionInvocation;
41  import com.opensymphony.xwork2.config.ConfigurationException;
42  import com.opensymphony.xwork2.util.ValueStack;
43  import com.opensymphony.xwork2.util.ValueStackFactory;
44  
45  
46  /***
47   */
48  public class TagUtils {
49  
50      public static ValueStack getStack(PageContext pageContext) {
51          HttpServletRequest req = (HttpServletRequest) pageContext.getRequest();
52          ValueStack stack = (ValueStack) req.getAttribute(ServletActionContext.STRUTS_VALUESTACK_KEY);
53  
54          if (stack == null) {
55              stack = ValueStackFactory.getFactory().createValueStack();
56  
57              HttpServletResponse res = (HttpServletResponse) pageContext.getResponse();
58              Dispatcher du = Dispatcher.getInstance();
59              if (du == null) {
60                  throw new ConfigurationException("The Struts dispatcher cannot be found.  This is usually caused by "+
61                          "using Struts tags without the associated filter. Struts tags are only usable when the request "+
62                          "has passed through its servlet filter, which initializes the Struts dispatcher needed for this tag.");
63              }
64              Map extraContext = du.createContextMap(new RequestMap(req),
65                      req.getParameterMap(),
66                      new SessionMap(req),
67                      new ApplicationMap(pageContext.getServletContext()),
68                      req,
69                      res,
70                      pageContext.getServletContext());
71              extraContext.put(ServletActionContext.PAGE_CONTEXT, pageContext);
72              stack.getContext().putAll(extraContext);
73              req.setAttribute(ServletActionContext.STRUTS_VALUESTACK_KEY, stack);
74  
75              // also tie this stack/context to the ThreadLocal
76              ActionContext.setContext(new ActionContext(stack.getContext()));
77          } else {
78              // let's make sure that the current page context is in the action context
79              Map context = stack.getContext();
80              context.put(ServletActionContext.PAGE_CONTEXT, pageContext);
81  
82              AttributeMap attrMap = new AttributeMap(context);
83              context.put("attr", attrMap);
84          }
85  
86          return stack;
87      }
88  
89      public static String buildNamespace(ActionMapper mapper, ValueStack stack, HttpServletRequest request) {
90          ActionContext context = new ActionContext(stack.getContext());
91          ActionInvocation invocation = context.getActionInvocation();
92  
93          if (invocation == null) {
94              ActionMapping mapping = mapper.getMapping(request,
95                      Dispatcher.getInstance().getConfigurationManager());
96  
97              if (mapping != null) {
98                  return mapping.getNamespace();
99              } else {
100                 // well, if the ActionMapper can't tell us, and there is no existing action invocation,
101                 // let's just go with a default guess that the namespace is the last the path minus the
102                 // last part (/foo/bar/baz.xyz -> /foo/bar)
103 
104                 String path = RequestUtils.getServletPath(request);
105                 return path.substring(0, path.lastIndexOf("/"));
106             }
107         } else {
108             return invocation.getProxy().getNamespace();
109         }
110     }
111 }