FilterDispatcherCompatWeblogic61


1   package com.opensymphony.webwork.dispatcher;
2   
3   import com.opensymphony.webwork.config.ServletContextSingleton;
4   import org.apache.commons.logging.Log;
5   import org.apache.commons.logging.LogFactory;
6   
7   import javax.servlet.Filter  ;
8   import javax.servlet.FilterConfig  ;
9   import javax.servlet.ServletContext  ;
10  import javax.servlet.ServletException  ;
11  import javax.servlet.http.HttpSession  ;
12  
13  
14  /**
15   * When running Weblogic Server 6.1, this class should be
16   * specified in web.xml instead of {@link FilterDispatcher}.
17   * <p/>
18   * This class properly handles the weblogic.jar handling
19   * of servlet filters.  There is one serious incompatibility, and
20   * that is that while {@link FilterConfig#init(FilterConfig)}
21   * throws a {@link ServletException}, this class's method
22   * {@link #setFilterConfig(FilterConfig)} does not throw
23   * the exception.  Since {@link #setFilterConfig(FilterConfig)}
24   * invokes {@link FilterConfig#init(FilterConfig)}, the setter
25   * must "swallow" the exception.  This it does by logging the
26   * exception as an error.
27   *
28   * @author Scott N. Smith scottnelsonsmith@yahoo.com
29   * @version $Id: FilterDispatcherCompatWeblogic61.java,v 1.2 2005/06/25 16:15:16 plightbo Exp $
30   */
31  public class FilterDispatcherCompatWeblogic61
32          extends FilterDispatcher
33          implements Filter   {
34      /**
35       * the standard logger
36       */
37      private static Log log =
38              LogFactory.getLog(FilterDispatcherCompatWeblogic61.class);
39  
40      /**
41       * dummy setter for {@link #filterConfig}; this method
42       * sets up the {@link com.opensymphony.webwork.config.ServletContextSingleton} with
43       * the servlet context from the filter configuration.
44       * <p/>
45       * This is needed by Weblogic Server 6.1 because it
46       * uses a slightly obsolete Servlet 2.3-minus spec
47       * whose {@link Filter} interface requires this method.
48       * <p/>
49       *
50       * @param filterConfig the filter configuration.
51       */
52      public void setFilterConfig(FilterConfig   filterConfig) {
53          try {
54              init(filterConfig);
55          } catch (ServletException   se) {
56              log.error("Couldn't set the filter configuration in this filter", se);
57          }
58  
59          ServletContextSingleton singleton = ServletContextSingleton.getInstance();
60          singleton.setServletContext(filterConfig.getServletContext());
61      }
62  
63      /**
64       * answers the servlet context.
65       * <p/>
66       * Servlet 2.3 specifies that this can be retrieved from
67       * the session.  Unfortunately, weblogic.jar can only retrieve
68       * the servlet context from the filter config.  Hence, this
69       * returns the servlet context from the singleton that was
70       * setup by {@link #setFilterConfig(FilterConfig)}.
71       *
72       * @param session the HTTP session.  Not used
73       * @return the servlet context.
74       */
75      protected ServletContext   getServletContext(HttpSession   session) {
76          ServletContextSingleton singleton =
77                  ServletContextSingleton.getInstance();
78          return singleton.getServletContext();
79      }
80  
81      /**
82       * This method is required by Weblogic 6.1 SP4 because
83       * they defined this as a required method just before
84       * the Servlet 2.3 specification was finalized.
85       *
86       * @return the filter's filter configuration
87       */
88      public FilterConfig   getFilterConfig() {
89          return super.getFilterConfig();
90      }
91  }
92
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