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annotate src/org/eclipse/jetty/server/handler/ScopedHandler.java @ 815:07c82fabc46b

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author Franklin Schmidt <fschmidt@gmail.com>
date Fri, 09 Sep 2016 14:27:05 -0600
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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.Request;
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28
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29
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30 /* ------------------------------------------------------------ */
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31 /** ScopedHandler.
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32 *
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33 * A ScopedHandler is a HandlerWrapper where the wrapped handlers
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34 * each define a scope. When {@link #handle(String, Request, HttpServletRequest, HttpServletResponse)}
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35 * is called on the first ScopedHandler in a chain of HandlerWrappers,
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36 * the {@link #doScope(String, Request, HttpServletRequest, HttpServletResponse)} method is
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37 * called on all contained ScopedHandlers, before the
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38 * {@link #doHandle(String, Request, HttpServletRequest, HttpServletResponse)} method
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39 * is called on all contained handlers.
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40 *
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41 * <p>For example if Scoped handlers A, B & C were chained together, then
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42 * the calling order would be:<pre>
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43 * A.handle(...)
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44 * A.doScope(...)
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45 * B.doScope(...)
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46 * C.doScope(...)
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47 * A.doHandle(...)
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48 * B.doHandle(...)
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49 * C.doHandle(...)
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50 * <pre>
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51 *
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52 * <p>If non scoped handler X was in the chained A, B, X & C, then
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53 * the calling order would be:<pre>
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54 * A.handle(...)
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55 * A.doScope(...)
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56 * B.doScope(...)
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57 * C.doScope(...)
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58 * A.doHandle(...)
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59 * B.doHandle(...)
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60 * X.handle(...)
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61 * C.handle(...)
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62 * C.doHandle(...)
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63 * <pre>
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64 *
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65 * <p>A typical usage pattern is:<pre>
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66 * private static class MyHandler extends ScopedHandler
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67 * {
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68 * public void doScope(String target, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
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69 * {
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70 * try
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71 * {
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72 * setUpMyScope();
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73 * super.doScope(target,request,response);
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74 * }
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75 * finally
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76 * {
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77 * tearDownMyScope();
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78 * }
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79 * }
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80 *
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81 * public void doHandle(String target, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
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82 * {
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83 * try
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84 * {
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85 * doMyHandling();
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86 * super.doHandle(target,request,response);
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87 * }
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88 * finally
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89 * {
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90 * cleanupMyHandling();
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91 * }
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92 * }
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93 * }
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94 * </pre>
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95 */
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96 public abstract class ScopedHandler extends HandlerWrapper
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97 {
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98 private static final ThreadLocal<ScopedHandler> __outerScope= new ThreadLocal<ScopedHandler>();
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99 protected ScopedHandler _outerScope;
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100 protected ScopedHandler _nextScope;
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101
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102 /* ------------------------------------------------------------ */
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103 /**
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104 * @see org.eclipse.jetty.server.handler.HandlerWrapper#doStart()
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105 */
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106 @Override
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107 protected void doStart() throws Exception
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108 {
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109 try
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110 {
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111 _outerScope=__outerScope.get();
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112 if (_outerScope==null)
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113 __outerScope.set(this);
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114
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115 super.doStart();
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116
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117 _nextScope= (ScopedHandler)getChildHandlerByClass(ScopedHandler.class);
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118
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119 }
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120 finally
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121 {
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122 if (_outerScope==null)
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123 __outerScope.set(null);
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124 }
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125 }
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126
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127
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128 /* ------------------------------------------------------------ */
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129 /*
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130 */
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131 @Override
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132 public final void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
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133 {
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134 if (_outerScope==null)
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135 doScope(target,baseRequest,request, response);
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136 else
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137 doHandle(target,baseRequest,request, response);
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138 }
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139
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140 /* ------------------------------------------------------------ */
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141 /*
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142 * Scope the handler
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143 */
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144 public abstract void doScope(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response)
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145 throws IOException, ServletException;
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146
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147 /* ------------------------------------------------------------ */
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148 /*
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149 * Scope the handler
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150 */
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151 public final void nextScope(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response)
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152 throws IOException, ServletException
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153 {
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154 // this method has been manually inlined in several locations, but
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155 // is called protected by an if(never()), so your IDE can find those
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156 // locations if this code is changed.
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157 if (_nextScope!=null)
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158 _nextScope.doScope(target,baseRequest,request, response);
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159 else if (_outerScope!=null)
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160 _outerScope.doHandle(target,baseRequest,request, response);
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161 else
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162 doHandle(target,baseRequest,request, response);
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163 }
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164
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165 /* ------------------------------------------------------------ */
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166 /*
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167 * Do the handler work within the scope.
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168 */
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169 public abstract void doHandle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response)
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170 throws IOException, ServletException;
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171
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172 /* ------------------------------------------------------------ */
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173 /*
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174 * Do the handler work within the scope.
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175 */
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176 public final void nextHandle(String target, final Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
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177 {
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178 // this method has been manually inlined in several locations, but
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179 // is called protected by an if(never()), so your IDE can find those
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180 // locations if this code is changed.
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181 if (_nextScope!=null && _nextScope==_handler)
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182 _nextScope.doHandle(target,baseRequest,request, response);
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183 else if (_handler!=null)
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184 _handler.handle(target,baseRequest, request, response);
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185 }
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186
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187 /* ------------------------------------------------------------ */
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188 protected boolean never()
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189 {
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190 return false;
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191 }
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192
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193 }