Mercurial Hosting > luan
annotate src/org/eclipse/jetty/server/handler/HandlerWrapper.java @ 1000:32d4b569567c
simplify handle()
| author | Franklin Schmidt <fschmidt@gmail.com> |
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| date | Wed, 19 Oct 2016 04:22:51 -0600 |
| parents | d9d95acded81 |
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| rev | line source |
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1 // |
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2 // ======================================================================== |
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3 // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd. |
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4 // ------------------------------------------------------------------------ |
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5 // All rights reserved. This program and the accompanying materials |
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6 // are made available under the terms of the Eclipse Public License v1.0 |
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7 // and Apache License v2.0 which accompanies this distribution. |
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8 // |
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9 // The Eclipse Public License is available at |
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10 // http://www.eclipse.org/legal/epl-v10.html |
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11 // |
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12 // The Apache License v2.0 is available at |
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13 // http://www.opensource.org/licenses/apache2.0.php |
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14 // |
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15 // You may elect to redistribute this code under either of these licenses. |
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16 // ======================================================================== |
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17 // |
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18 |
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19 package org.eclipse.jetty.server.handler; |
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20 |
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21 import java.io.IOException; |
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22 |
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23 import javax.servlet.ServletException; |
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24 import javax.servlet.http.HttpServletResponse; |
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25 |
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26 import org.eclipse.jetty.server.Handler; |
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27 import org.eclipse.jetty.server.Request; |
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28 import org.eclipse.jetty.server.Server; |
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29 import org.eclipse.jetty.util.component.LifeCycle; |
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30 |
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31 /* ------------------------------------------------------------ */ |
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32 /** A <code>HandlerWrapper</code> acts as a {@link Handler} but delegates the {@link Handler#handle handle} method and |
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33 * {@link LifeCycle life cycle} events to a delegate. This is primarily used to implement the <i>Decorator</i> pattern. |
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34 * |
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35 */ |
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36 public class HandlerWrapper extends AbstractHandlerContainer |
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37 { |
| 993 | 38 protected Handler _handler; |
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39 |
| 993 | 40 /* ------------------------------------------------------------ */ |
| 41 /** | |
| 42 * | |
| 43 */ | |
| 44 public HandlerWrapper() | |
| 45 { | |
| 46 } | |
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47 |
| 993 | 48 /* ------------------------------------------------------------ */ |
| 49 /** | |
| 50 * @return Returns the handlers. | |
| 51 */ | |
| 52 public Handler getHandler() | |
| 53 { | |
| 54 return _handler; | |
| 55 } | |
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56 |
| 993 | 57 /* ------------------------------------------------------------ */ |
| 58 /** | |
| 59 * @return Returns the handlers. | |
| 60 */ | |
| 61 public Handler[] getHandlers() | |
| 62 { | |
| 63 if (_handler==null) | |
| 64 return new Handler[0]; | |
| 65 return new Handler[] {_handler}; | |
| 66 } | |
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67 |
| 993 | 68 /* ------------------------------------------------------------ */ |
| 69 /** | |
| 70 * @param handler Set the {@link Handler} which should be wrapped. | |
| 71 */ | |
| 72 public void setHandler(Handler handler) | |
| 73 { | |
| 74 if (isStarted()) | |
| 75 throw new IllegalStateException(STARTED); | |
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76 |
| 993 | 77 Handler old_handler = _handler; |
| 78 _handler = handler; | |
| 79 if (handler!=null) | |
| 80 handler.setServer(getServer()); | |
| 81 } | |
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82 |
| 993 | 83 /* ------------------------------------------------------------ */ |
| 84 /* | |
| 85 * @see org.eclipse.thread.AbstractLifeCycle#doStart() | |
| 86 */ | |
| 87 @Override | |
| 88 protected void doStart() throws Exception | |
| 89 { | |
| 90 if (_handler!=null) | |
| 91 _handler.start(); | |
| 92 super.doStart(); | |
| 93 } | |
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94 |
| 993 | 95 /* ------------------------------------------------------------ */ |
| 96 /* | |
| 97 * @see org.eclipse.thread.AbstractLifeCycle#doStop() | |
| 98 */ | |
| 99 @Override | |
| 100 protected void doStop() throws Exception | |
| 101 { | |
| 102 if (_handler!=null) | |
| 103 _handler.stop(); | |
| 104 super.doStop(); | |
| 105 } | |
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106 |
| 1000 | 107 @Override |
| 108 public void handle(String target, Request request, HttpServletResponse response) throws IOException, ServletException | |
| 993 | 109 { |
| 110 if (_handler!=null && isStarted()) | |
| 111 { | |
| 1000 | 112 _handler.handle(target, request, response); |
| 993 | 113 } |
| 114 } | |
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115 |
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116 |
| 993 | 117 /* ------------------------------------------------------------ */ |
| 118 @Override | |
| 119 public void setServer(Server server) | |
| 120 { | |
| 121 Server old_server=getServer(); | |
| 122 if (server==old_server) | |
| 123 return; | |
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124 |
| 993 | 125 if (isStarted()) |
| 126 throw new IllegalStateException(STARTED); | |
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127 |
| 993 | 128 super.setServer(server); |
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129 |
| 993 | 130 Handler h=getHandler(); |
| 131 if (h!=null) | |
| 132 h.setServer(server); | |
| 133 } | |
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134 |
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135 |
| 993 | 136 /* ------------------------------------------------------------ */ |
| 137 @Override | |
| 138 protected Object expandChildren(Object list, Class byClass) | |
| 139 { | |
| 140 return expandHandler(_handler,list,byClass); | |
| 141 } | |
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142 |
| 993 | 143 /* ------------------------------------------------------------ */ |
| 144 public <H extends Handler> H getNestedHandlerByClass(Class<H> byclass) | |
| 145 { | |
| 146 HandlerWrapper h=this; | |
| 147 while (h!=null) | |
| 148 { | |
| 149 if (byclass.isInstance(h)) | |
| 150 return (H)h; | |
| 151 Handler w = h.getHandler(); | |
| 152 if (w instanceof HandlerWrapper) | |
| 153 h=(HandlerWrapper)w; | |
| 154 else break; | |
| 155 } | |
| 156 return null; | |
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157 |
| 993 | 158 } |
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159 |
| 993 | 160 /* ------------------------------------------------------------ */ |
| 161 @Override | |
| 162 public void destroy() | |
| 163 { | |
| 164 if (!isStopped()) | |
| 165 throw new IllegalStateException("!STOPPED"); | |
| 166 Handler child=getHandler(); | |
| 167 if (child!=null) | |
| 168 { | |
| 169 setHandler(null); | |
| 170 child.destroy(); | |
| 171 } | |
| 172 super.destroy(); | |
| 173 } | |
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174 |
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175 } |