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annotate src/org/eclipse/jetty/server/handler/HandlerWrapper.java @ 993:d9d95acded81
remove ScopedHandler
| author | Franklin Schmidt <fschmidt@gmail.com> |
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| date | Tue, 18 Oct 2016 15:54:54 -0600 |
| parents | 22a4e93ed20e |
| children | 32d4b569567c |
| 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.HttpServletRequest; |
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25 import javax.servlet.http.HttpServletResponse; |
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26 |
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27 import org.eclipse.jetty.server.Handler; |
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28 import org.eclipse.jetty.server.Request; |
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29 import org.eclipse.jetty.server.Server; |
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30 import org.eclipse.jetty.util.component.LifeCycle; |
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31 |
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32 /* ------------------------------------------------------------ */ |
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33 /** A <code>HandlerWrapper</code> acts as a {@link Handler} but delegates the {@link Handler#handle handle} method and |
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34 * {@link LifeCycle life cycle} events to a delegate. This is primarily used to implement the <i>Decorator</i> pattern. |
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35 * |
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36 */ |
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37 public class HandlerWrapper extends AbstractHandlerContainer |
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38 { |
| 993 | 39 protected Handler _handler; |
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40 |
| 993 | 41 /* ------------------------------------------------------------ */ |
| 42 /** | |
| 43 * | |
| 44 */ | |
| 45 public HandlerWrapper() | |
| 46 { | |
| 47 } | |
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48 |
| 993 | 49 /* ------------------------------------------------------------ */ |
| 50 /** | |
| 51 * @return Returns the handlers. | |
| 52 */ | |
| 53 public Handler getHandler() | |
| 54 { | |
| 55 return _handler; | |
| 56 } | |
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57 |
| 993 | 58 /* ------------------------------------------------------------ */ |
| 59 /** | |
| 60 * @return Returns the handlers. | |
| 61 */ | |
| 62 public Handler[] getHandlers() | |
| 63 { | |
| 64 if (_handler==null) | |
| 65 return new Handler[0]; | |
| 66 return new Handler[] {_handler}; | |
| 67 } | |
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68 |
| 993 | 69 /* ------------------------------------------------------------ */ |
| 70 /** | |
| 71 * @param handler Set the {@link Handler} which should be wrapped. | |
| 72 */ | |
| 73 public void setHandler(Handler handler) | |
| 74 { | |
| 75 if (isStarted()) | |
| 76 throw new IllegalStateException(STARTED); | |
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77 |
| 993 | 78 Handler old_handler = _handler; |
| 79 _handler = handler; | |
| 80 if (handler!=null) | |
| 81 handler.setServer(getServer()); | |
| 82 } | |
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83 |
| 993 | 84 /* ------------------------------------------------------------ */ |
| 85 /* | |
| 86 * @see org.eclipse.thread.AbstractLifeCycle#doStart() | |
| 87 */ | |
| 88 @Override | |
| 89 protected void doStart() throws Exception | |
| 90 { | |
| 91 if (_handler!=null) | |
| 92 _handler.start(); | |
| 93 super.doStart(); | |
| 94 } | |
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95 |
| 993 | 96 /* ------------------------------------------------------------ */ |
| 97 /* | |
| 98 * @see org.eclipse.thread.AbstractLifeCycle#doStop() | |
| 99 */ | |
| 100 @Override | |
| 101 protected void doStop() throws Exception | |
| 102 { | |
| 103 if (_handler!=null) | |
| 104 _handler.stop(); | |
| 105 super.doStop(); | |
| 106 } | |
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107 |
| 993 | 108 /* ------------------------------------------------------------ */ |
| 109 public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException | |
| 110 { | |
| 111 if (_handler!=null && isStarted()) | |
| 112 { | |
| 113 _handler.handle(target,baseRequest, request, response); | |
| 114 } | |
| 115 } | |
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116 |
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117 |
| 993 | 118 /* ------------------------------------------------------------ */ |
| 119 @Override | |
| 120 public void setServer(Server server) | |
| 121 { | |
| 122 Server old_server=getServer(); | |
| 123 if (server==old_server) | |
| 124 return; | |
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125 |
| 993 | 126 if (isStarted()) |
| 127 throw new IllegalStateException(STARTED); | |
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128 |
| 993 | 129 super.setServer(server); |
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130 |
| 993 | 131 Handler h=getHandler(); |
| 132 if (h!=null) | |
| 133 h.setServer(server); | |
| 134 } | |
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135 |
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136 |
| 993 | 137 /* ------------------------------------------------------------ */ |
| 138 @Override | |
| 139 protected Object expandChildren(Object list, Class byClass) | |
| 140 { | |
| 141 return expandHandler(_handler,list,byClass); | |
| 142 } | |
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143 |
| 993 | 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; | |
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158 |
| 993 | 159 } |
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160 |
| 993 | 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 } | |
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175 |
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176 } |