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annotate src/org/eclipse/jetty/server/handler/HandlerWrapper.java @ 848:22a4e93ed20e

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author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 19 Sep 2016 16:38:36 -0600
parents 3428c60d7cfc
children d9d95acded81
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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 {
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39 protected Handler _handler;
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40
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41 /* ------------------------------------------------------------ */
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42 /**
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43 *
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44 */
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45 public HandlerWrapper()
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46 {
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47 }
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48
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49 /* ------------------------------------------------------------ */
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50 /**
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51 * @return Returns the handlers.
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52 */
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53 public Handler getHandler()
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54 {
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55 return _handler;
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56 }
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57
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58 /* ------------------------------------------------------------ */
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59 /**
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60 * @return Returns the handlers.
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61 */
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62 public Handler[] getHandlers()
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63 {
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64 if (_handler==null)
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65 return new Handler[0];
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66 return new Handler[] {_handler};
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67 }
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68
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69 /* ------------------------------------------------------------ */
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70 /**
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71 * @param handler Set the {@link Handler} which should be wrapped.
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72 */
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73 public void setHandler(Handler handler)
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74 {
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75 if (isStarted())
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76 throw new IllegalStateException(STARTED);
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77
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78 Handler old_handler = _handler;
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79 _handler = handler;
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80 if (handler!=null)
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81 handler.setServer(getServer());
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82 }
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83
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84 /* ------------------------------------------------------------ */
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85 /*
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86 * @see org.eclipse.thread.AbstractLifeCycle#doStart()
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87 */
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88 @Override
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89 protected void doStart() throws Exception
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90 {
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91 if (_handler!=null)
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92 _handler.start();
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93 super.doStart();
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94 }
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95
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96 /* ------------------------------------------------------------ */
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97 /*
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98 * @see org.eclipse.thread.AbstractLifeCycle#doStop()
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99 */
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100 @Override
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101 protected void doStop() throws Exception
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102 {
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103 if (_handler!=null)
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104 _handler.stop();
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105 super.doStop();
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106 }
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107
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108 /* ------------------------------------------------------------ */
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109 public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
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110 {
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111 if (_handler!=null && isStarted())
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112 {
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113 _handler.handle(target,baseRequest, request, response);
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114 }
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115 }
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116
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117
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118 /* ------------------------------------------------------------ */
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119 @Override
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120 public void setServer(Server server)
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121 {
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122 Server old_server=getServer();
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123 if (server==old_server)
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124 return;
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125
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126 if (isStarted())
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127 throw new IllegalStateException(STARTED);
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128
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129 super.setServer(server);
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130
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131 Handler h=getHandler();
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132 if (h!=null)
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133 h.setServer(server);
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134 }
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135
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136
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137 /* ------------------------------------------------------------ */
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138 @Override
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139 protected Object expandChildren(Object list, Class byClass)
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140 {
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141 return expandHandler(_handler,list,byClass);
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142 }
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143
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144 /* ------------------------------------------------------------ */
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145 public <H extends Handler> H getNestedHandlerByClass(Class<H> byclass)
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146 {
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147 HandlerWrapper h=this;
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148 while (h!=null)
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149 {
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150 if (byclass.isInstance(h))
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151 return (H)h;
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152 Handler w = h.getHandler();
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153 if (w instanceof HandlerWrapper)
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154 h=(HandlerWrapper)w;
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155 else break;
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156 }
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157 return null;
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158
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159 }
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160
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161 /* ------------------------------------------------------------ */
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162 @Override
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163 public void destroy()
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164 {
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165 if (!isStopped())
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166 throw new IllegalStateException("!STOPPED");
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167 Handler child=getHandler();
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168 if (child!=null)
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169 {
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170 setHandler(null);
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171 child.destroy();
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172 }
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173 super.destroy();
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174 }
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175
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176 }