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annotate src/org/eclipse/jetty/util/resource/URLResource.java @ 1025:cf0367978d8b

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author Franklin Schmidt <fschmidt@gmail.com>
date Wed, 02 Nov 2016 23:46:43 -0600
parents 8e9db0bbf4f9
children
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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.util.resource;
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20
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21 import java.io.File;
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22 import java.io.IOException;
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23 import java.io.InputStream;
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24 import java.io.OutputStream;
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25 import java.net.MalformedURLException;
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26 import java.net.URL;
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27 import java.net.URLConnection;
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28 import java.security.Permission;
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29
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30 import org.eclipse.jetty.util.URIUtil;
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31 import org.slf4j.Logger;
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32 import org.slf4j.LoggerFactory;
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33
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34 /* ------------------------------------------------------------ */
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35 /** Abstract resource class.
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36 */
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37 public class URLResource extends Resource
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38 {
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39 private static final Logger LOG = LoggerFactory.getLogger(URLResource.class);
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40 protected URL _url;
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41 protected String _urlString;
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42
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43 protected URLConnection _connection;
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44 protected InputStream _in=null;
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45 transient boolean _useCaches = Resource.__defaultUseCaches;
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46
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47 /* ------------------------------------------------------------ */
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48 protected URLResource(URL url, URLConnection connection)
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49 {
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50 _url = url;
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51 _urlString=_url.toString();
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52 _connection=connection;
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53 }
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54
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55 /* ------------------------------------------------------------ */
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56 protected URLResource (URL url, URLConnection connection, boolean useCaches)
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57 {
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58 this (url, connection);
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59 _useCaches = useCaches;
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60 }
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61
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62 /* ------------------------------------------------------------ */
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63 protected synchronized boolean checkConnection()
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64 {
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65 if (_connection==null)
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66 {
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67 try{
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68 _connection=_url.openConnection();
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69 _connection.setUseCaches(_useCaches);
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70 }
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71 catch(IOException e)
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72 {
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73 LOG.trace("",e);
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74 }
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75 }
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76 return _connection!=null;
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77 }
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78
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79 /* ------------------------------------------------------------ */
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80 /** Release any resources held by the resource.
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81 */
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82 @Override
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83 public synchronized void release()
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84 {
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85 if (_in!=null)
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86 {
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87 try{_in.close();}catch(IOException e){LOG.trace("",e);}
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88 _in=null;
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89 }
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90
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91 if (_connection!=null)
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92 _connection=null;
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93 }
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94
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95 /* ------------------------------------------------------------ */
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96 /**
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97 * Returns true if the represented resource exists.
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98 */
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99 @Override
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100 public boolean exists()
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101 {
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102 try
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103 {
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104 synchronized(this)
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105 {
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106 if (checkConnection() && _in==null )
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107 _in = _connection.getInputStream();
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108 }
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109 }
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110 catch (IOException e)
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111 {
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112 LOG.trace("",e);
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113 }
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114 return _in!=null;
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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 * Returns true if the respresenetd resource is a container/directory.
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120 * If the resource is not a file, resources ending with "/" are
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121 * considered directories.
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122 */
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123 @Override
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124 public boolean isDirectory()
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125 {
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126 return exists() && _url.toString().endsWith("/");
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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 /**
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132 * Returns the last modified time
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133 */
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134 @Override
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135 public long lastModified()
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136 {
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137 if (checkConnection())
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138 return _connection.getLastModified();
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139 return -1;
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140 }
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141
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142
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143 /* ------------------------------------------------------------ */
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144 /**
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145 * Return the length of the resource
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146 */
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147 @Override
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148 public long length()
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149 {
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150 if (checkConnection())
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151 return _connection.getContentLength();
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152 return -1;
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153 }
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154
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155 /* ------------------------------------------------------------ */
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156 /**
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157 * Returns an URL representing the given resource
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158 */
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159 @Override
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160 public URL getURL()
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161 {
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162 return _url;
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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 * Returns an File representing the given resource or NULL if this
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168 * is not possible.
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169 */
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170 @Override
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171 public File getFile()
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172 throws IOException
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173 {
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174 // Try the permission hack
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175 if (checkConnection())
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176 {
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177 Permission perm = _connection.getPermission();
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178 if (perm instanceof java.io.FilePermission)
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179 return new File(perm.getName());
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180 }
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181
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182 // Try the URL file arg
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183 try {return new File(_url.getFile());}
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184 catch(Exception e) {LOG.trace("",e);}
802
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185
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186 // Don't know the file
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187 return null;
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188 }
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189
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190 /* ------------------------------------------------------------ */
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191 /**
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192 * Returns the name of the resource
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193 */
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194 @Override
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195 public String getName()
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196 {
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197 return _url.toExternalForm();
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198 }
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199
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200 /* ------------------------------------------------------------ */
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201 /**
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202 * Returns an input stream to the resource
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203 */
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204 @Override
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205 public synchronized InputStream getInputStream()
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206 throws java.io.IOException
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207 {
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208 if (!checkConnection())
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209 throw new IOException( "Invalid resource");
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210
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211 try
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212 {
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213 if( _in != null)
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214 {
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215 InputStream in = _in;
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216 _in=null;
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217 return in;
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218 }
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219 return _connection.getInputStream();
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220 }
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221 finally
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222 {
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223 _connection=null;
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224 }
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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 /**
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230 * Returns an output stream to the resource
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231 */
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232 @Override
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233 public OutputStream getOutputStream()
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234 throws java.io.IOException, SecurityException
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235 {
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236 throw new IOException( "Output not supported");
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237 }
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238
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239 /* ------------------------------------------------------------ */
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240 /**
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241 * Deletes the given resource
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242 */
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243 @Override
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244 public boolean delete()
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245 throws SecurityException
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246 {
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247 throw new SecurityException( "Delete not supported");
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248 }
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249
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250 /* ------------------------------------------------------------ */
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251 /**
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252 * Rename the given resource
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253 */
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254 @Override
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255 public boolean renameTo( Resource dest)
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256 throws SecurityException
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257 {
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258 throw new SecurityException( "RenameTo not supported");
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259 }
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260
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261 /* ------------------------------------------------------------ */
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262 /**
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263 * Returns a list of resource names contained in the given resource
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264 */
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265 @Override
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266 public String[] list()
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267 {
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268 return null;
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269 }
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270
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271 /* ------------------------------------------------------------ */
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272 /**
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273 * Returns the resource contained inside the current resource with the
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274 * given name
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275 */
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276 @Override
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277 public Resource addPath(String path)
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278 throws IOException,MalformedURLException
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279 {
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280 if (path==null)
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281 return null;
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282
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283 path = URIUtil.canonicalPath(path);
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284
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285 return newResource(URIUtil.addPaths(_url.toExternalForm(),path));
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286 }
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287
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288 /* ------------------------------------------------------------ */
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289 @Override
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290 public String toString()
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291 {
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292 return _urlString;
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293 }
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294
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295 /* ------------------------------------------------------------ */
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296 @Override
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297 public int hashCode()
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298 {
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299 return _urlString.hashCode();
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300 }
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301
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302 /* ------------------------------------------------------------ */
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303 @Override
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304 public boolean equals( Object o)
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305 {
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306 return o instanceof URLResource && _urlString.equals(((URLResource)o)._urlString);
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307 }
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308
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309 /* ------------------------------------------------------------ */
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310 public boolean getUseCaches ()
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311 {
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312 return _useCaches;
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313 }
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314
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315 /* ------------------------------------------------------------ */
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316 @Override
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317 public boolean isContainedIn (Resource containingResource) throws MalformedURLException
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318 {
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319 return false; //TODO check this!
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320 }
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321 }