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1
11 package org.jboss.portal.server.servlet;
12
13 import org.apache.log4j.Logger;
14
15 import javax.servlet.Filter  ;
16 import javax.servlet.FilterConfig ;
17 import javax.servlet.ServletException ;
18 import javax.servlet.ServletRequest ;
19 import javax.servlet.ServletResponse ;
20 import javax.servlet.FilterChain ;
21 import javax.servlet.http.HttpServletRequest ;
22 import javax.servlet.http.HttpServletResponse ;
23 import java.io.IOException ;
24 import java.lang.reflect.Method ;
25 import java.lang.reflect.InvocationTargetException ;
26
27
31 public class CommandFilter implements Filter
32 {
33
34 private static final Logger log = Logger.getLogger(CommandFilter.class);
35
36 public void init(FilterConfig cfg) throws ServletException
37 {
38 }
39
40 public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws IOException , ServletException
41 {
42 Object cmd = req.getAttribute(FilterCommand.REQ_ATT_KEY);
43 if (cmd != null)
44 {
45 try
46 {
47 req.removeAttribute(FilterCommand.REQ_ATT_KEY);
48 Method methods = cmd.getClass().getMethod(
49 "execute",
50 new Class []{
51 HttpServletRequest .class,
52 HttpServletResponse .class,
53 FilterChain .class});
54 Object result = methods.invoke(cmd, new Object []{req,resp,chain});
55 req.setAttribute(FilterCommand.REQ_ATT_KEY, result);
56 }
57 catch (NoSuchMethodException e)
58 {
59 throw new ServletException ("No execute method found on the filter command", e);
60 }
61 catch (InvocationTargetException e)
62 {
63 Throwable wrappee = e.getTargetException();
65 log.error("Exception in command invocation", wrappee);
66
67 if (wrappee instanceof ServletException )
69 {
70 throw (ServletException )wrappee;
71 }
72 if (wrappee instanceof IOException )
74 {
75 throw (IOException )wrappee;
76 }
77 if (wrappee instanceof RuntimeException )
79 {
80 throw (RuntimeException )wrappee;
81 }
82 if (wrappee instanceof Error )
84 {
85 throw (Error )wrappee;
86 }
87 throw new ServletException ("The invoked command threw an exception", wrappee);
89 }
90 catch (IllegalAccessException e)
91 {
92 throw new ServletException ("Unexpected IllegalAccessException during command invocation", e);
93 }
94 }
95 else
96 {
97 chain.doFilter(req, resp);
99 }
100 }
101
102 public void destroy()
103 {
104 }
105 }
106 |
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