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1
18 package org.apache.beehive.netui.pageflow.interceptor.action.internal;
19
20 import org.apache.beehive.netui.pageflow.interceptor.InterceptorChain;
21 import org.apache.beehive.netui.pageflow.interceptor.InterceptorContext;
22 import org.apache.beehive.netui.pageflow.interceptor.Interceptor;
23 import org.apache.beehive.netui.pageflow.interceptor.InterceptorException;
24 import org.apache.beehive.netui.pageflow.interceptor.action.ActionInterceptor;
25 import org.apache.beehive.netui.pageflow.interceptor.action.ActionInterceptorContext;
26 import org.apache.struts.action.ActionForward;
27
28 import javax.servlet.ServletException  ;
29 import java.util.List ;
30 import java.io.IOException ;
31
32 public class ActionInterceptors
33 {
34 private static final class WrapActionInterceptorChain
35 extends InterceptorChain
36 {
37 private ActionExecutor _actionExecutor;
38
39 public WrapActionInterceptorChain( InterceptorContext context, List interceptors,
40 ActionExecutor actionExecutor )
41 {
42 super( context, interceptors );
43 _actionExecutor = actionExecutor;
44 }
45
46 protected Object invoke( Interceptor interceptor )
47 throws InterceptorException
48 {
49 return ( ( ActionInterceptor ) interceptor ).wrapAction( ( ActionInterceptorContext ) getContext(), this );
50 }
51
52 public Object continueChain()
53 throws InterceptorException
54 {
55 if ( ! isEmpty() )
56 {
57 return invoke( removeFirst() );
58 }
59 else
60 {
61 try
62 {
63 return _actionExecutor.execute();
64 }
65 catch ( ServletException e )
66 {
67 throw new InterceptorException( e );
68 }
69 catch ( IOException e )
70 {
71 throw new InterceptorException( e );
72 }
73 }
74 }
75 }
76
77 public static ActionForward wrapAction( ActionInterceptorContext context, List interceptors,
78 ActionExecutor actionExecutor )
79 throws InterceptorException, IOException , ServletException
80 {
81 try
82 {
83 if ( interceptors != null )
84 {
85 WrapActionInterceptorChain chain = new WrapActionInterceptorChain( context, interceptors, actionExecutor );
86 return ( ActionForward ) chain.continueChain();
87 }
88 else
89 {
90 return actionExecutor.execute();
91 }
92 }
93 catch ( InterceptorException e )
94 {
95 Throwable cause = e.getCause();
96
97 if ( cause instanceof ServletException )
98 {
99 throw ( ServletException ) cause;
100 }
101 else if ( cause instanceof IOException )
102 {
103 throw ( IOException ) cause;
104 }
105
106 throw e;
107 }
108 }
109
110 public interface ActionExecutor
111 {
112 public ActionForward execute() throws IOException , ServletException , InterceptorException;
113 }
114 }
115 |
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