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19 package org.eclipse.jetty.server.handler;
20
21 import java.io.IOException;
22 import java.util.Arrays;
23 import java.util.List;
24
25 import javax.servlet.ServletException;
26 import javax.servlet.http.HttpServletRequest;
27 import javax.servlet.http.HttpServletResponse;
28
29 import org.eclipse.jetty.http.HttpStatus;
30 import org.eclipse.jetty.server.Handler;
31 import org.eclipse.jetty.server.HandlerContainer;
32 import org.eclipse.jetty.server.Request;
33 import org.eclipse.jetty.server.Server;
34 import org.eclipse.jetty.util.annotation.ManagedAttribute;
35 import org.eclipse.jetty.util.annotation.ManagedObject;
36 import org.eclipse.jetty.util.component.LifeCycle;
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42
43 @ManagedObject("Handler wrapping another Handler")
44 public class HandlerWrapper extends AbstractHandlerContainer
45 {
46 protected Handler _handler;
47
48
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50
51
52 public HandlerWrapper()
53 {
54 }
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58
59
60 @ManagedAttribute(value="Wrapped Handler", readonly=true)
61 public Handler getHandler()
62 {
63 return _handler;
64 }
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69
70 @Override
71 public Handler[] getHandlers()
72 {
73 if (_handler==null)
74 return new Handler[0];
75 return new Handler[] {_handler};
76 }
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81
82 public void setHandler(Handler handler)
83 {
84 if (isStarted())
85 throw new IllegalStateException(STARTED);
86
87
88 if (handler==this || (handler instanceof HandlerContainer &&
89 Arrays.asList(((HandlerContainer)handler).getChildHandlers()).contains(this)))
90 throw new IllegalStateException("setHandler loop");
91
92 if (handler!=null)
93 handler.setServer(getServer());
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95 Handler old=_handler;
96 _handler=handler;
97 updateBean(old,_handler,true);
98 }
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112 public void insertHandler(HandlerWrapper wrapper)
113 {
114 if (wrapper==null)
115 throw new IllegalArgumentException();
116
117 HandlerWrapper tail = wrapper;
118 while(tail.getHandler() instanceof HandlerWrapper)
119 tail=(HandlerWrapper)tail.getHandler();
120 if (tail.getHandler()!=null)
121 throw new IllegalArgumentException("bad tail of inserted wrapper chain");
122
123 Handler next=getHandler();
124 setHandler(wrapper);
125 tail.setHandler(next);
126 }
127
128
129 @Override
130 public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
131 {
132 Handler handler=_handler;
133 if (handler!=null)
134 handler.handle(target,baseRequest, request, response);
135 }
136
137
138 @Override
139 protected void expandChildren(List<Handler> list, Class<?> byClass)
140 {
141 expandHandler(_handler,list,byClass);
142 }
143
144
145 @Override
146 public void destroy()
147 {
148 if (!isStopped())
149 throw new IllegalStateException("!STOPPED");
150 Handler child=getHandler();
151 if (child!=null)
152 {
153 setHandler(null);
154 child.destroy();
155 }
156 super.destroy();
157 }
158
159 }