Mercurial Hosting > luan
annotate src/org/eclipse/jetty/server/handler/GzipHandler.java @ 1049:4afdf0f0c5bc
remove unused JBuffer methods
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Mon, 07 Nov 2016 23:34:48 -0700 |
parents | 32d4b569567c |
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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 import java.io.OutputStream; |
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23 import java.io.OutputStreamWriter; |
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24 import java.io.PrintWriter; |
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25 import java.io.UnsupportedEncodingException; |
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26 import java.util.HashSet; |
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27 import java.util.Set; |
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28 import java.util.StringTokenizer; |
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29 import java.util.zip.DeflaterOutputStream; |
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30 import java.util.zip.GZIPOutputStream; |
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31 |
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32 import javax.servlet.ServletException; |
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33 import javax.servlet.http.HttpServletRequest; |
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34 import javax.servlet.http.HttpServletResponse; |
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35 |
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36 import org.eclipse.jetty.http.HttpMethods; |
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37 import org.eclipse.jetty.http.gzip.CompressedResponseWrapper; |
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38 import org.eclipse.jetty.http.gzip.AbstractCompressedStream; |
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39 import org.eclipse.jetty.server.Request; |
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40 import org.slf4j.Logger; |
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41 import org.slf4j.LoggerFactory; |
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42 |
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43 /* ------------------------------------------------------------ */ |
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44 /** |
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45 * GZIP Handler This handler will gzip the content of a response if: |
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46 * <ul> |
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47 * <li>The filter is mapped to a matching path</li> |
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48 * <li>The response status code is >=200 and <300 |
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49 * <li>The content length is unknown or more than the <code>minGzipSize</code> initParameter or the minGzipSize is 0(default)</li> |
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50 * <li>The content-type is in the comma separated list of mimeTypes set in the <code>mimeTypes</code> initParameter or if no mimeTypes are defined the |
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51 * content-type is not "application/gzip"</li> |
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52 * <li>No content-encoding is specified by the resource</li> |
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53 * </ul> |
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54 * |
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55 * <p> |
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56 * Compressing the content can greatly improve the network bandwidth usage, but at a cost of memory and CPU cycles. If this handler is used for static content, |
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57 * then use of efficient direct NIO may be prevented, thus use of the gzip mechanism of the <code>org.eclipse.jetty.servlet.DefaultServlet</code> is advised instead. |
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58 * </p> |
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59 */ |
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60 public class GzipHandler extends HandlerWrapper |
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61 { |
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62 private static final Logger LOG = LoggerFactory.getLogger(GzipHandler.class); |
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63 |
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64 protected Set<String> _mimeTypes; |
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65 protected Set<String> _excluded; |
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66 protected int _bufferSize = 8192; |
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67 protected int _minGzipSize = 256; |
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68 protected String _vary = "Accept-Encoding, User-Agent"; |
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69 |
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70 /* ------------------------------------------------------------ */ |
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71 /** |
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72 * Instantiates a new gzip handler. |
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73 */ |
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74 public GzipHandler() |
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75 { |
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76 } |
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77 |
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78 /* ------------------------------------------------------------ */ |
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79 /** |
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80 * Get the mime types. |
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81 * |
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82 * @return mime types to set |
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83 */ |
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84 public Set<String> getMimeTypes() |
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85 { |
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86 return _mimeTypes; |
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87 } |
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88 |
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89 /* ------------------------------------------------------------ */ |
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90 /** |
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91 * Set the mime types. |
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92 * |
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93 * @param mimeTypes |
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94 * the mime types to set |
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95 */ |
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96 public void setMimeTypes(Set<String> mimeTypes) |
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97 { |
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98 _mimeTypes = mimeTypes; |
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99 } |
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100 |
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101 /* ------------------------------------------------------------ */ |
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102 /** |
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103 * Set the mime types. |
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104 * |
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105 * @param mimeTypes |
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106 * the mime types to set |
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107 */ |
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108 public void setMimeTypes(String mimeTypes) |
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109 { |
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110 if (mimeTypes != null) |
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111 { |
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112 _mimeTypes = new HashSet<String>(); |
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113 StringTokenizer tok = new StringTokenizer(mimeTypes,",",false); |
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114 while (tok.hasMoreTokens()) |
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115 { |
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116 _mimeTypes.add(tok.nextToken()); |
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117 } |
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118 } |
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119 } |
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120 |
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121 /* ------------------------------------------------------------ */ |
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122 /** |
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123 * Get the excluded user agents. |
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124 * |
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125 * @return excluded user agents |
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126 */ |
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127 public Set<String> getExcluded() |
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128 { |
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129 return _excluded; |
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130 } |
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131 |
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132 /* ------------------------------------------------------------ */ |
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133 /** |
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134 * Set the excluded user agents. |
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135 * |
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136 * @param excluded |
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137 * excluded user agents to set |
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138 */ |
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139 public void setExcluded(Set<String> excluded) |
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140 { |
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141 _excluded = excluded; |
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142 } |
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143 |
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144 /* ------------------------------------------------------------ */ |
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145 /** |
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146 * Set the excluded user agents. |
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147 * |
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148 * @param excluded |
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149 * excluded user agents to set |
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150 */ |
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151 public void setExcluded(String excluded) |
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152 { |
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153 if (excluded != null) |
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154 { |
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155 _excluded = new HashSet<String>(); |
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156 StringTokenizer tok = new StringTokenizer(excluded,",",false); |
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157 while (tok.hasMoreTokens()) |
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158 _excluded.add(tok.nextToken()); |
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159 } |
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160 } |
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161 |
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162 /* ------------------------------------------------------------ */ |
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163 /** |
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164 * @return The value of the Vary header set if a response can be compressed. |
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165 */ |
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166 public String getVary() |
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167 { |
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168 return _vary; |
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169 } |
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170 |
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171 /* ------------------------------------------------------------ */ |
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172 /** |
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173 * Set the value of the Vary header sent with responses that could be compressed. |
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174 * <p> |
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175 * By default it is set to 'Accept-Encoding, User-Agent' since IE6 is excluded by |
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176 * default from the excludedAgents. If user-agents are not to be excluded, then |
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177 * this can be set to 'Accept-Encoding'. Note also that shared caches may cache |
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178 * many copies of a resource that is varied by User-Agent - one per variation of the |
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179 * User-Agent, unless the cache does some normalization of the UA string. |
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180 * @param vary The value of the Vary header set if a response can be compressed. |
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181 */ |
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182 public void setVary(String vary) |
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183 { |
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184 _vary = vary; |
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185 } |
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186 |
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187 /* ------------------------------------------------------------ */ |
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188 /** |
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189 * Get the buffer size. |
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190 * |
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191 * @return the buffer size |
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192 */ |
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193 public int getBufferSize() |
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194 { |
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195 return _bufferSize; |
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196 } |
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197 |
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198 /* ------------------------------------------------------------ */ |
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199 /** |
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200 * Set the buffer size. |
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201 * |
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202 * @param bufferSize |
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203 * buffer size to set |
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204 */ |
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205 public void setBufferSize(int bufferSize) |
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206 { |
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207 _bufferSize = bufferSize; |
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208 } |
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209 |
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210 /* ------------------------------------------------------------ */ |
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211 /** |
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212 * Get the minimum reponse size. |
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213 * |
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214 * @return minimum reponse size |
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215 */ |
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216 public int getMinGzipSize() |
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217 { |
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218 return _minGzipSize; |
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219 } |
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220 |
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221 /* ------------------------------------------------------------ */ |
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222 /** |
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223 * Set the minimum reponse size. |
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224 * |
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225 * @param minGzipSize |
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226 * minimum reponse size |
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227 */ |
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228 public void setMinGzipSize(int minGzipSize) |
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229 { |
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230 _minGzipSize = minGzipSize; |
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231 } |
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232 |
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233 @Override |
1000 | 234 public void handle(String target, Request request, HttpServletResponse response) throws IOException, ServletException |
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235 { |
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236 if (_handler!=null && isStarted()) |
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237 { |
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238 String ae = request.getHeader("accept-encoding"); |
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239 if (ae != null && ae.indexOf("gzip")>=0 && !response.containsHeader("Content-Encoding") |
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240 && !HttpMethods.HEAD.equalsIgnoreCase(request.getMethod())) |
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241 { |
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242 if (_excluded!=null) |
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243 { |
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244 String ua = request.getHeader("User-Agent"); |
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245 if (_excluded.contains(ua)) |
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246 { |
1000 | 247 _handler.handle(target, request, response); |
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248 return; |
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249 } |
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250 } |
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251 |
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252 final CompressedResponseWrapper wrappedResponse = newGzipResponseWrapper(request,response); |
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253 |
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254 boolean exceptional=true; |
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255 try |
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256 { |
1000 | 257 _handler.handle(target, request, wrappedResponse); |
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258 exceptional=false; |
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259 } |
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260 finally |
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261 { |
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262 if (exceptional && !response.isCommitted()) |
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263 { |
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264 wrappedResponse.resetBuffer(); |
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265 wrappedResponse.noCompression(); |
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266 } |
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267 else |
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268 wrappedResponse.finish(); |
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269 } |
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270 } |
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271 else |
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272 { |
1000 | 273 _handler.handle(target, request, response); |
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274 } |
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275 } |
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276 } |
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277 |
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278 /** |
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279 * Allows derived implementations to replace ResponseWrapper implementation. |
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280 * |
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281 * @param request the request |
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282 * @param response the response |
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283 * @return the gzip response wrapper |
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284 */ |
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285 protected CompressedResponseWrapper newGzipResponseWrapper(HttpServletRequest request, HttpServletResponse response) |
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286 { |
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287 return new CompressedResponseWrapper(request,response) |
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288 { |
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289 { |
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290 super.setMimeTypes(GzipHandler.this._mimeTypes); |
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291 super.setBufferSize(GzipHandler.this._bufferSize); |
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292 super.setMinCompressSize(GzipHandler.this._minGzipSize); |
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293 } |
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294 |
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295 @Override |
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296 protected AbstractCompressedStream newCompressedStream(HttpServletRequest request,HttpServletResponse response) throws IOException |
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297 { |
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298 return new AbstractCompressedStream("gzip",request,this,_vary) |
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299 { |
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300 @Override |
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301 protected DeflaterOutputStream createStream() throws IOException |
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302 { |
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303 return new GZIPOutputStream(_response.getOutputStream(),_bufferSize); |
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304 } |
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305 }; |
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306 } |
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307 |
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308 @Override |
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309 protected PrintWriter newWriter(OutputStream out,String encoding) throws UnsupportedEncodingException |
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310 { |
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311 return GzipHandler.this.newWriter(out,encoding); |
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312 } |
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313 }; |
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314 } |
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315 |
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316 /** |
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317 * Allows derived implementations to replace PrintWriter implementation. |
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318 * |
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319 * @param out the out |
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320 * @param encoding the encoding |
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321 * @return the prints the writer |
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322 * @throws UnsupportedEncodingException |
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323 */ |
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324 protected PrintWriter newWriter(OutputStream out,String encoding) throws UnsupportedEncodingException |
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325 { |
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326 return encoding==null?new PrintWriter(out):new PrintWriter(new OutputStreamWriter(out,encoding)); |
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327 } |
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328 } |