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16 package org.mortbay.jetty.handler;
17
18 import java.io.IOException;
19
20 import javax.servlet.ServletException;
21 import javax.servlet.http.HttpServletRequest;
22 import javax.servlet.http.HttpServletResponse;
23
24 import org.mortbay.component.LifeCycle;
25 import org.mortbay.jetty.Handler;
26 import org.mortbay.jetty.HandlerContainer;
27 import org.mortbay.jetty.Server;
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33
34 public class HandlerWrapper extends AbstractHandlerContainer
35 {
36 private Handler _handler;
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39
40
41
42 public HandlerWrapper()
43 {
44 super();
45 }
46
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50
51 public Handler getHandler()
52 {
53 return _handler;
54 }
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60 public void setHandler(Handler handler)
61 {
62 try
63 {
64 Handler old_handler = _handler;
65
66 if (getServer()!=null)
67 getServer().getContainer().update(this, old_handler, handler, "handler");
68
69 if (handler!=null)
70 {
71 handler.setServer(getServer());
72 }
73
74 _handler = handler;
75
76 if (old_handler!=null)
77 {
78 if (old_handler.isStarted())
79 old_handler.stop();
80 }
81 }
82 catch(Exception e)
83 {
84 IllegalStateException ise= new IllegalStateException();
85 ise.initCause(e);
86 throw ise;
87 }
88 }
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100 public void addHandler(Handler handler)
101 {
102 Handler old = getHandler();
103 if (old!=null && !(handler instanceof HandlerContainer))
104 throw new IllegalArgumentException("Cannot add");
105 setHandler(handler);
106 if (old!=null)
107 ((HandlerContainer)handler).addHandler(old);
108 }
109
110
111 public void removeHandler (Handler handler)
112 {
113 Handler old = getHandler();
114 if (old!=null && (old instanceof HandlerContainer))
115 ((HandlerContainer)old).removeHandler(handler);
116 else if (old!=null && handler.equals(old))
117 setHandler(null);
118 else
119 throw new IllegalStateException("Cannot remove");
120 }
121
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126
127 protected void doStart() throws Exception
128 {
129 if (_handler!=null)
130 _handler.start();
131 super.doStart();
132 }
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138 protected void doStop() throws Exception
139 {
140 super.doStop();
141 if (_handler!=null)
142 _handler.stop();
143 }
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149 public void handle(String target, HttpServletRequest request, HttpServletResponse response, int dispatch) throws IOException, ServletException
150 {
151 if (_handler!=null && isStarted())
152 _handler.handle(target,request, response, dispatch);
153 }
154
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156
157 public void setServer(Server server)
158 {
159 Server old_server=getServer();
160
161 super.setServer(server);
162
163 Handler h=getHandler();
164 if (h!=null)
165 h.setServer(server);
166
167 if (server!=null && server!=old_server)
168 server.getContainer().update(this, null,_handler, "handler");
169 }
170
171
172
173 protected Object expandChildren(Object list, Class byClass)
174 {
175 return expandHandler(_handler,list,byClass);
176 }
177
178
179 }