WebWorkRequestWrapper


1   package com.opensymphony.webwork.dispatcher.multipart;
2   
3   import com.opensymphony.xwork.ActionContext;
4   import com.opensymphony.xwork.util.OgnlValueStack;
5   
6   import javax.servlet.http.HttpServletRequest  ;
7   import javax.servlet.http.HttpServletRequestWrapper  ;
8   
9   /**
10   * All WebWork requests are wrapped with class, which provides simple JSTL accessibility.
11   * This is because JSTL works with request attributes, so this class delegates to the
12   * value stack except for a few cases where required to prevent infinite loops. Namely,
13   * we don't let any attribute name with "#" in it delegate out to the value stack, as
14   * it could potentially cause an infinite loop. For example, an infinite loop would
15   * take place if you called: request.getAttribute("#attr.foo").
16   *
17   * @since 2.2
18   */
19  public class WebWorkRequestWrapper extends HttpServletRequestWrapper   {
20      public WebWorkRequestWrapper(HttpServletRequest   req) {
21          super(req);
22      }
23  
24      public Object   getAttribute(String   s) {
25          Object   attribute = super.getAttribute(s);
26  
27          boolean alreadyIn = true;
28          Boolean   b = (Boolean  ) ActionContext.getContext().get("__requestWrapper.getAttribute");
29          if (b != null) {
30              alreadyIn = b.booleanValue();
31          }
32  
33          // note: we don't let # come through or else a request for
34          // #attr.foo or #request.foo could cause an endless loop
35          if (alreadyIn && attribute == null && s.indexOf("#") == -1) {
36              try {
37                  // If not found, then try the ValueStack
38                  ActionContext.getContext().put("__requestWrapper.getAttribute", Boolean.TRUE);
39                  OgnlValueStack stack = ActionContext.getContext().getValueStack();
40                  if (stack != null) {
41                      attribute = stack.findValue(s);
42                  }
43              } finally {
44                  ActionContext.getContext().put("__requestWrapper.getAttribute", Boolean.FALSE);
45              }
46          }
47          return attribute;
48      }
49  }
50
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