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14 package org.eclipse.jetty.server.handler;
15
16 import java.io.IOException;
17 import javax.servlet.ServletException;
18 import javax.servlet.http.HttpServletRequest;
19 import javax.servlet.http.HttpServletResponse;
20
21 import org.eclipse.jetty.server.Handler;
22 import org.eclipse.jetty.server.Request;
23 import org.eclipse.jetty.server.Server;
24 import org.eclipse.jetty.util.component.LifeCycle;
25
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29
30
31 public class HandlerWrapper extends AbstractHandlerContainer
32 {
33 protected Handler _handler;
34
35
36
37
38
39 public HandlerWrapper()
40 {
41 }
42
43
44
45
46
47 public Handler getHandler()
48 {
49 return _handler;
50 }
51
52
53
54
55
56 public Handler[] getHandlers()
57 {
58 if (_handler==null)
59 return new Handler[0];
60 return new Handler[] {_handler};
61 }
62
63
64
65
66
67 public void setHandler(Handler handler)
68 {
69 if (isStarted())
70 throw new IllegalStateException(STARTED);
71
72 Handler old_handler = _handler;
73 _handler = handler;
74 if (handler!=null)
75 handler.setServer(getServer());
76
77 if (getServer()!=null)
78 getServer().getContainer().update(this, old_handler, handler, "handler");
79 }
80
81
82
83
84
85 @Override
86 protected void doStart() throws Exception
87 {
88 if (_handler!=null)
89 _handler.start();
90 super.doStart();
91 }
92
93
94
95
96
97 @Override
98 protected void doStop() throws Exception
99 {
100 if (_handler!=null)
101 _handler.stop();
102 super.doStop();
103 }
104
105
106 public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
107 {
108 if (_handler!=null && isStarted())
109 {
110 _handler.handle(target,baseRequest, request, response);
111 }
112 }
113
114
115
116 @Override
117 public void setServer(Server server)
118 {
119 Server old_server=getServer();
120 if (server==old_server)
121 return;
122
123 if (isStarted())
124 throw new IllegalStateException(STARTED);
125
126 super.setServer(server);
127
128 Handler h=getHandler();
129 if (h!=null)
130 h.setServer(server);
131
132 if (server!=null && server!=old_server)
133 server.getContainer().update(this, null,_handler, "handler");
134 }
135
136
137
138 @Override
139 protected Object expandChildren(Object list, Class byClass)
140 {
141 return expandHandler(_handler,list,byClass);
142 }
143
144
145 public <H extends Handler> H getNestedHandlerByClass(Class<H> byclass)
146 {
147 HandlerWrapper h=this;
148 while (h!=null)
149 {
150 if (byclass.isInstance(h))
151 return (H)h;
152 Handler w = h.getHandler();
153 if (w instanceof HandlerWrapper)
154 h=(HandlerWrapper)w;
155 else break;
156 }
157 return null;
158
159 }
160
161
162 @Override
163 public void destroy()
164 {
165 if (!isStopped())
166 throw new IllegalStateException("!STOPPED");
167 Handler child=getHandler();
168 if (child!=null)
169 {
170 setHandler(null);
171 child.destroy();
172 }
173 super.destroy();
174 }
175
176 }