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annotate src/org/eclipse/jetty/util/resource/FileResource.java @ 1046:a8c92b0a08ed

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add JBuffer
author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 07 Nov 2016 22:39:39 -0700
parents 8e9db0bbf4f9
children
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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.util.resource;
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20
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21 import java.io.File;
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22 import java.io.FileInputStream;
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23 import java.io.FileOutputStream;
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24 import java.io.IOException;
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25 import java.io.InputStream;
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26 import java.io.OutputStream;
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27 import java.net.MalformedURLException;
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28 import java.net.URI;
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29 import java.net.URISyntaxException;
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30 import java.net.URL;
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31 import java.net.URLConnection;
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32 import java.security.Permission;
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33
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34 import org.eclipse.jetty.util.IO;
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35 import org.eclipse.jetty.util.URIUtil;
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36 import org.slf4j.Logger;
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37 import org.slf4j.LoggerFactory;
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38
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39
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40 /* ------------------------------------------------------------ */
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41 /** File Resource.
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42 *
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43 * Handle resources of implied or explicit file type.
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44 * This class can check for aliasing in the filesystem (eg case
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45 * insensitivity). By default this is turned on, or it can be controlled
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46 * by calling the static method @see FileResource#setCheckAliases(boolean)
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47 *
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48 */
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49 public class FileResource extends URLResource
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50 {
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51 private static final Logger LOG = LoggerFactory.getLogger(FileResource.class);
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52 private static boolean __checkAliases = true;
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53
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54 /* ------------------------------------------------------------ */
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55 private File _file;
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56 private transient URL _alias=null;
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57 private transient boolean _aliasChecked=false;
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58
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59 /* ------------------------------------------------------------------------------- */
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60 /** setCheckAliases.
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61 * @param checkAliases True of resource aliases are to be checked for (eg case insensitivity or 8.3 short names) and treated as not found.
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62 */
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63 public static void setCheckAliases(boolean checkAliases)
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64 {
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65 __checkAliases=checkAliases;
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66 }
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67
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68 /* ------------------------------------------------------------------------------- */
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69 /** getCheckAliases.
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70 * @return True of resource aliases are to be checked for (eg case insensitivity or 8.3 short names) and treated as not found.
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71 */
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72 public static boolean getCheckAliases()
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73 {
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74 return __checkAliases;
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75 }
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76
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77 /* -------------------------------------------------------- */
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78 public FileResource(URL url)
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79 throws IOException, URISyntaxException
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80 {
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81 super(url,null);
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82
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83 try
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84 {
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85 // Try standard API to convert URL to file.
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86 _file =new File(new URI(url.toString()));
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87 }
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88 catch (URISyntaxException e)
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89 {
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90 throw e;
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91 }
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92 catch (Exception e)
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93 {
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94 LOG.trace("",e);
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95 try
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96 {
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97 // Assume that File.toURL produced unencoded chars. So try
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98 // encoding them.
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99 String file_url="file:"+URIUtil.encodePath(url.toString().substring(5));
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100 URI uri = new URI(file_url);
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101 if (uri.getAuthority()==null)
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102 _file = new File(uri);
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103 else
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104 _file = new File("//"+uri.getAuthority()+URIUtil.decodePath(url.getFile()));
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105 }
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106 catch (Exception e2)
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107 {
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108 LOG.trace("",e2);
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109
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110 // Still can't get the file. Doh! try good old hack!
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111 checkConnection();
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112 Permission perm = _connection.getPermission();
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113 _file = new File(perm==null?url.getFile():perm.getName());
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114 }
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115 }
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116 if (_file.isDirectory())
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117 {
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118 if (!_urlString.endsWith("/"))
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119 _urlString=_urlString+"/";
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120 }
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121 else
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122 {
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123 if (_urlString.endsWith("/"))
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124 _urlString=_urlString.substring(0,_urlString.length()-1);
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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 FileResource(URL url, URLConnection connection, File file)
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131 {
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132 super(url,connection);
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133 _file=file;
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134 if (_file.isDirectory() && !_urlString.endsWith("/"))
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135 _urlString=_urlString+"/";
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136 }
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137
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138 /* -------------------------------------------------------- */
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139 @Override
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140 public Resource addPath(String path)
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141 throws IOException,MalformedURLException
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142 {
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143 URLResource r=null;
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144 String url=null;
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145
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146 path = org.eclipse.jetty.util.URIUtil.canonicalPath(path);
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147
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148 if ("/".equals(path))
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149 return this;
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150 else if (!isDirectory())
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151 {
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152 r=(FileResource)super.addPath(path);
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153 url=r._urlString;
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154 }
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155 else
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156 {
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157 if (path==null)
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158 throw new MalformedURLException();
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159
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160 // treat all paths being added as relative
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161 String rel=path;
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162 if (path.startsWith("/"))
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163 rel = path.substring(1);
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164
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165 url=URIUtil.addPaths(_urlString,URIUtil.encodePath(rel));
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166 r=(URLResource)Resource.newResource(url);
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167 }
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168
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169 // Check for encoding aliases
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170 // The encoded path should be a suffix of the resource (give or take a directory / )
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171 String encoded=URIUtil.encodePath(path);
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172 int expected=r.toString().length()-encoded.length();
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173 int index = r._urlString.lastIndexOf(encoded, expected);
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174 if (expected!=index && ((expected-1)!=index || path.endsWith("/") || !r.isDirectory()))
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175 {
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176 if (r instanceof FileResource)
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177 {
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178 ((FileResource)r)._alias=((FileResource)r)._file.getCanonicalFile().toURI().toURL();
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179 ((FileResource)r)._aliasChecked=true;
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180 }
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181 }
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182 return r;
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183 }
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184
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185
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186 /* ------------------------------------------------------------ */
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187 @Override
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188 public URL getAlias()
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189 {
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190 if (__checkAliases && !_aliasChecked)
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191 {
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192 try
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193 {
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194 String abs=_file.getAbsolutePath();
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195 String can=_file.getCanonicalPath();
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196
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197 if (abs.length()!=can.length() || !abs.equals(can))
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198 _alias=Resource.toURL(new File(can));
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199
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200 _aliasChecked=true;
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201
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202 if (_alias!=null && LOG.isDebugEnabled())
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203 {
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204 LOG.debug("ALIAS abs="+abs);
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205 LOG.debug("ALIAS can="+can);
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206 }
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207 }
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208 catch(Exception e)
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209 {
820
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210 LOG.warn("EXCEPTION",e);
802
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211 return getURL();
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212 }
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213 }
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214 return _alias;
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215 }
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216
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217 /* -------------------------------------------------------- */
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218 /**
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219 * Returns true if the resource exists.
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220 */
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221 @Override
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222 public boolean exists()
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223 {
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224 return _file.exists();
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225 }
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226
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227 /* -------------------------------------------------------- */
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228 /**
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229 * Returns the last modified time
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230 */
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231 @Override
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232 public long lastModified()
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233 {
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234 return _file.lastModified();
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235 }
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236
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237 /* -------------------------------------------------------- */
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238 /**
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239 * Returns true if the respresenetd resource is a container/directory.
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240 */
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241 @Override
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242 public boolean isDirectory()
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243 {
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244 return _file.isDirectory();
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245 }
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246
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247 /* --------------------------------------------------------- */
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248 /**
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249 * Return the length of the resource
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250 */
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251 @Override
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252 public long length()
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253 {
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254 return _file.length();
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255 }
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256
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257
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258 /* --------------------------------------------------------- */
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259 /**
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260 * Returns the name of the resource
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261 */
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262 @Override
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263 public String getName()
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264 {
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265 return _file.getAbsolutePath();
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266 }
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267
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268 /* ------------------------------------------------------------ */
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269 /**
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270 * Returns an File representing the given resource or NULL if this
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271 * is not possible.
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272 */
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273 @Override
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274 public File getFile()
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275 {
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276 return _file;
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277 }
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278
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279 /* --------------------------------------------------------- */
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280 /**
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281 * Returns an input stream to the resource
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282 */
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283 @Override
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284 public InputStream getInputStream() throws IOException
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285 {
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286 return new FileInputStream(_file);
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287 }
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288
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289 /* --------------------------------------------------------- */
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290 /**
3428c60d7cfc replace jetty jars with source
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291 * Returns an output stream to the resource
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292 */
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293 @Override
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294 public OutputStream getOutputStream()
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295 throws java.io.IOException, SecurityException
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296 {
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297 return new FileOutputStream(_file);
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298 }
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299
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300 /* --------------------------------------------------------- */
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301 /**
3428c60d7cfc replace jetty jars with source
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302 * Deletes the given resource
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303 */
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304 @Override
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305 public boolean delete()
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306 throws SecurityException
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307 {
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308 return _file.delete();
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309 }
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310
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311 /* --------------------------------------------------------- */
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312 /**
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313 * Rename the given resource
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314 */
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315 @Override
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316 public boolean renameTo( Resource dest)
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317 throws SecurityException
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318 {
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319 if( dest instanceof FileResource)
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320 return _file.renameTo( ((FileResource)dest)._file);
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321 else
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322 return false;
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323 }
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324
3428c60d7cfc replace jetty jars with source
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325 /* --------------------------------------------------------- */
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326 /**
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327 * Returns a list of resources contained in the given resource
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328 */
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329 @Override
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330 public String[] list()
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331 {
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332 String[] list =_file.list();
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333 if (list==null)
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334 return null;
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335 for (int i=list.length;i-->0;)
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336 {
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337 if (new File(_file,list[i]).isDirectory() &&
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diff changeset
338 !list[i].endsWith("/"))
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diff changeset
339 list[i]+="/";
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340 }
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341 return list;
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342 }
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343
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344 /* ------------------------------------------------------------ */
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345 /** Encode according to this resource type.
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346 * File URIs are encoded.
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347 * @param uri URI to encode.
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348 * @return The uri unchanged.
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349 */
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350 @Override
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351 public String encode(String uri)
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352 {
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353 return uri;
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354 }
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355
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356 /* ------------------------------------------------------------ */
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357 /**
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358 * @param o
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359 * @return <code>true</code> of the object <code>o</code> is a {@link FileResource} pointing to the same file as this resource.
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360 */
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361 @Override
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362 public boolean equals( Object o)
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363 {
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364 if (this == o)
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365 return true;
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366
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367 if (null == o || ! (o instanceof FileResource))
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368 return false;
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369
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370 FileResource f=(FileResource)o;
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371 return f._file == _file || (null != _file && _file.equals(f._file));
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372 }
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373
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374 /* ------------------------------------------------------------ */
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375 /**
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376 * @return the hashcode.
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377 */
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378 @Override
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379 public int hashCode()
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380 {
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381 return null == _file ? super.hashCode() : _file.hashCode();
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382 }
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383
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384 /* ------------------------------------------------------------ */
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385 @Override
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386 public void copyTo(File destination)
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387 throws IOException
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388 {
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389 if (isDirectory())
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390 {
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391 IO.copyDir(getFile(),destination);
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392 }
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393 else
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394 {
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395 if (destination.exists())
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396 throw new IllegalArgumentException(destination+" exists");
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397 IO.copy(getFile(),destination);
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398 }
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399 }
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400 }