ResolverSetupServletContextListener


1   /*
2    * Copyright (c) 2002-2003 by OpenSymphony
3    * All rights reserved.
4    */
5   package com.opensymphony.webwork.util;
6   
7   import com.opensymphony.xwork.config.Configuration;
8   import com.opensymphony.xwork.config.ConfigurationManager;
9   import com.opensymphony.xwork.config.entities.PackageConfig;
10  
11  import javax.servlet.ServletContextEvent  ;
12  import javax.servlet.ServletContextListener  ;
13  import java.util.Iterator  ;
14  
15  
16  /**
17   * A Servlet Context Listener that will loop through all Reference Resolvers available in
18   * the xwork Configuration and set the ServletContext on those that are ServletContextAware.
19   * The Servlet Context can be used by the External Reference Resolver to initialise it's state. i.e. the
20   * Spring framework uses a ContextServletListener to initialise it's IoC container, storing it's
21   * container context (ApplicationContext in Spring terms) in the Servlet context, the External
22   * Reference Resolver can get a reference to the container context from the servlet context.
23   *
24   * @author Ross
25   */
26  public class ResolverSetupServletContextListener implements ServletContextListener   {
27      //~ Methods ////////////////////////////////////////////////////////////////
28  
29      public void contextDestroyed(ServletContextEvent   event) {
30      }
31  
32      public void contextInitialized(ServletContextEvent   event) {
33          Configuration config = ConfigurationManager.getConfiguration();
34          String   key;
35          PackageConfig packageConfig;
36  
37          for (Iterator   iter = config.getPackageConfigNames().iterator();
38               iter.hasNext();) {
39              key = (String  ) iter.next();
40              packageConfig = config.getPackageConfig(key);
41  
42              if (packageConfig.getExternalRefResolver() instanceof ServletContextAware) {
43                  ((ServletContextAware) packageConfig.getExternalRefResolver()).setServletContext(event.getServletContext());
44              }
45          }
46      }
47  }
48
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