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annotate src/org/eclipse/jetty/util/resource/JarResource.java @ 889:5731a7707466

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author Franklin Schmidt <fschmidt@gmail.com>
date Thu, 06 Oct 2016 23:24:30 -0600
parents 8e9db0bbf4f9
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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.FileOutputStream;
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23 import java.io.FilterInputStream;
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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.net.JarURLConnection;
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27 import java.net.URL;
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28 import java.util.jar.JarEntry;
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29 import java.util.jar.JarInputStream;
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30 import java.util.jar.Manifest;
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31
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32 import org.eclipse.jetty.util.IO;
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33 import org.eclipse.jetty.util.URIUtil;
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34 import org.slf4j.Logger;
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35 import org.slf4j.LoggerFactory;
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36
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37
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38 /* ------------------------------------------------------------ */
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39 public class JarResource extends URLResource
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40 {
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41 private static final Logger LOG = LoggerFactory.getLogger(JarResource.class);
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42 protected JarURLConnection _jarConnection;
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43
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44 /* -------------------------------------------------------- */
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45 JarResource(URL url)
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46 {
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47 super(url,null);
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48 }
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49
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50 /* ------------------------------------------------------------ */
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51 JarResource(URL url, boolean useCaches)
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52 {
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53 super(url, null, useCaches);
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54 }
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55
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56 /* ------------------------------------------------------------ */
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57 @Override
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58 public synchronized void release()
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59 {
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60 _jarConnection=null;
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61 super.release();
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62 }
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63
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64 /* ------------------------------------------------------------ */
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65 @Override
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66 protected synchronized boolean checkConnection()
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67 {
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68 super.checkConnection();
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69 try
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70 {
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71 if (_jarConnection!=_connection)
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72 newConnection();
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73 }
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74 catch(IOException e)
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75 {
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76 LOG.trace("",e);
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77 _jarConnection=null;
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78 }
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79
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80 return _jarConnection!=null;
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81 }
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82
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83 /* ------------------------------------------------------------ */
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84 /**
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85 * @throws IOException Sub-classes of <code>JarResource</code> may throw an IOException (or subclass)
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86 */
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87 protected void newConnection() throws IOException
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88 {
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89 _jarConnection=(JarURLConnection)_connection;
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90 }
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91
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92 /* ------------------------------------------------------------ */
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93 /**
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94 * Returns true if the respresenetd resource exists.
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95 */
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96 @Override
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97 public boolean exists()
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98 {
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99 if (_urlString.endsWith("!/"))
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100 return checkConnection();
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101 else
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102 return super.exists();
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103 }
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104
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105 /* ------------------------------------------------------------ */
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106 @Override
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107 public File getFile()
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108 throws IOException
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109 {
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110 return null;
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111 }
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112
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113 /* ------------------------------------------------------------ */
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114 @Override
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115 public InputStream getInputStream()
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116 throws java.io.IOException
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117 {
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118 checkConnection();
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119 if (!_urlString.endsWith("!/"))
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120 return new FilterInputStream(super.getInputStream())
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121 {
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122 @Override
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123 public void close() throws IOException {this.in=IO.getClosedStream();}
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124 };
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125
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126 URL url = new URL(_urlString.substring(4,_urlString.length()-2));
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127 InputStream is = url.openStream();
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128 return is;
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129 }
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130
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131 /* ------------------------------------------------------------ */
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132 @Override
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133 public void copyTo(File directory)
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134 throws IOException
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135 {
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136 if (!exists())
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137 return;
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138
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139 if(LOG.isDebugEnabled())
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140 LOG.debug("Extract "+this+" to "+directory);
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141
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142 String urlString = this.getURL().toExternalForm().trim();
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143 int endOfJarUrl = urlString.indexOf("!/");
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144 int startOfJarUrl = (endOfJarUrl >= 0?4:0);
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145
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146 if (endOfJarUrl < 0)
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147 throw new IOException("Not a valid jar url: "+urlString);
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148
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149 URL jarFileURL = new URL(urlString.substring(startOfJarUrl, endOfJarUrl));
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150 String subEntryName = (endOfJarUrl+2 < urlString.length() ? urlString.substring(endOfJarUrl + 2) : null);
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151 boolean subEntryIsDir = (subEntryName != null && subEntryName.endsWith("/")?true:false);
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152
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153 if (LOG.isDebugEnabled())
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154 LOG.debug("Extracting entry = "+subEntryName+" from jar "+jarFileURL);
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155
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156 InputStream is = jarFileURL.openConnection().getInputStream();
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157 JarInputStream jin = new JarInputStream(is);
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158 JarEntry entry;
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159 boolean shouldExtract;
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160 while((entry=jin.getNextJarEntry())!=null)
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161 {
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162 String entryName = entry.getName();
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163 if ((subEntryName != null) && (entryName.startsWith(subEntryName)))
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164 {
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165 // is the subentry really a dir?
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166 if (!subEntryIsDir && subEntryName.length()+1==entryName.length() && entryName.endsWith("/"))
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167 subEntryIsDir=true;
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168
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169 //if there is a particular subEntry that we are looking for, only
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170 //extract it.
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171 if (subEntryIsDir)
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172 {
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173 //if it is a subdirectory we are looking for, then we
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174 //are looking to extract its contents into the target
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175 //directory. Remove the name of the subdirectory so
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176 //that we don't wind up creating it too.
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177 entryName = entryName.substring(subEntryName.length());
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178 if (!entryName.equals(""))
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179 {
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180 //the entry is
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181 shouldExtract = true;
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182 }
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183 else
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184 shouldExtract = false;
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185 }
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186 else
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187 shouldExtract = true;
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188 }
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189 else if ((subEntryName != null) && (!entryName.startsWith(subEntryName)))
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190 {
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191 //there is a particular entry we are looking for, and this one
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192 //isn't it
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193 shouldExtract = false;
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194 }
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195 else
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196 {
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197 //we are extracting everything
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198 shouldExtract = true;
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199 }
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200
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201
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202 if (!shouldExtract)
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203 {
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204 if (LOG.isDebugEnabled())
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205 LOG.debug("Skipping entry: "+entryName);
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206 continue;
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207 }
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208
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209 String dotCheck = entryName.replace('\\', '/');
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210 dotCheck = URIUtil.canonicalPath(dotCheck);
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211 if (dotCheck == null)
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212 {
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213 if (LOG.isDebugEnabled())
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214 LOG.debug("Invalid entry: "+entryName);
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215 continue;
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216 }
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217
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218 File file=new File(directory,entryName);
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219
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220 if (entry.isDirectory())
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221 {
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222 // Make directory
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223 if (!file.exists())
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224 file.mkdirs();
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225 }
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226 else
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227 {
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228 // make directory (some jars don't list dirs)
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229 File dir = new File(file.getParent());
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230 if (!dir.exists())
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231 dir.mkdirs();
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232
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233 // Make file
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234 FileOutputStream fout = null;
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235 try
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236 {
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237 fout = new FileOutputStream(file);
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238 IO.copy(jin,fout);
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239 }
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240 finally
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241 {
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242 IO.close(fout);
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243 }
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244
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245 // touch the file.
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246 if (entry.getTime()>=0)
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247 file.setLastModified(entry.getTime());
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248 }
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249 }
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250
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251 if ((subEntryName == null) || (subEntryName != null && subEntryName.equalsIgnoreCase("META-INF/MANIFEST.MF")))
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252 {
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253 Manifest manifest = jin.getManifest();
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254 if (manifest != null)
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255 {
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256 File metaInf = new File (directory, "META-INF");
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257 metaInf.mkdir();
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258 File f = new File(metaInf, "MANIFEST.MF");
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259 FileOutputStream fout = new FileOutputStream(f);
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260 manifest.write(fout);
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261 fout.close();
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262 }
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263 }
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264 IO.close(jin);
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265 }
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266
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267 public static Resource newJarResource(Resource resource) throws IOException
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268 {
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269 if (resource instanceof JarResource)
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270 return resource;
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271 return Resource.newResource("jar:" + resource + "!/");
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272 }
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273 }