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annotate src/org/eclipse/jetty/util/IO.java @ 1022:3718afd99988

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HttpHeaders uses StringCache
author Franklin Schmidt <fschmidt@gmail.com>
date Tue, 01 Nov 2016 01:04:46 -0600
parents 2bb375e94f64
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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;
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20 import java.io.ByteArrayOutputStream;
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21 import java.io.Closeable;
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22 import java.io.File;
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23 import java.io.FileInputStream;
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24 import java.io.FileOutputStream;
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25 import java.io.IOException;
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26 import java.io.InputStream;
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27 import java.io.InputStreamReader;
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28 import java.io.OutputStream;
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29 import java.io.PrintWriter;
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30 import java.io.Reader;
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31 import java.io.StringWriter;
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32 import java.io.Writer;
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33
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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 /** IO Utilities.
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39 * Provides stream handling utilities in
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40 * singleton Threadpool implementation accessed by static members.
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41 */
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42 public class IO
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43 {
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44 private static final Logger LOG = LoggerFactory.getLogger(IO.class);
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45
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46 /* ------------------------------------------------------------------- */
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47 private static int bufferSize = 64*1024;
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48
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49 /* ------------------------------------------------------------------- */
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50 /** Copy Stream in to Stream out until EOF or exception.
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51 */
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52 public static void copy(InputStream in, OutputStream out)
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53 throws IOException
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54 {
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55 copy(in,out,-1);
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56 }
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57
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58 /* ------------------------------------------------------------------- */
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59 /** Copy Reader to Writer out until EOF or exception.
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60 */
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61 public static void copy(Reader in, Writer out)
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62 throws IOException
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63 {
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64 copy(in,out,-1);
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65 }
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66
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67 /* ------------------------------------------------------------------- */
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68 /** Copy Stream in to Stream for byteCount bytes or until EOF or exception.
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69 */
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70 public static void copy(InputStream in,
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71 OutputStream out,
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72 long byteCount)
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73 throws IOException
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74 {
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75 byte buffer[] = new byte[bufferSize];
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76 int len=bufferSize;
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77
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78 if (byteCount>=0)
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79 {
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80 while (byteCount>0)
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81 {
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82 int max = byteCount<bufferSize?(int)byteCount:bufferSize;
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83 len=in.read(buffer,0,max);
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84
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85 if (len==-1)
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86 break;
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87
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88 byteCount -= len;
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89 out.write(buffer,0,len);
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90 }
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91 }
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92 else
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93 {
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94 while (true)
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95 {
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96 len=in.read(buffer,0,bufferSize);
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97 if (len<0 )
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98 break;
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99 out.write(buffer,0,len);
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100 }
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101 }
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102 }
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103
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104 /* ------------------------------------------------------------------- */
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105 /** Copy Reader to Writer for byteCount bytes or until EOF or exception.
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106 */
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107 public static void copy(Reader in,
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108 Writer out,
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109 long byteCount)
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110 throws IOException
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111 {
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112 char buffer[] = new char[bufferSize];
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113 int len=bufferSize;
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114
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115 if (byteCount>=0)
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116 {
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117 while (byteCount>0)
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118 {
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119 if (byteCount<bufferSize)
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120 len=in.read(buffer,0,(int)byteCount);
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121 else
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122 len=in.read(buffer,0,bufferSize);
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123
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124 if (len==-1)
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125 break;
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126
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127 byteCount -= len;
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128 out.write(buffer,0,len);
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129 }
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130 }
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131 else if (out instanceof PrintWriter)
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132 {
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133 PrintWriter pout=(PrintWriter)out;
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134 while (!pout.checkError())
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135 {
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136 len=in.read(buffer,0,bufferSize);
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137 if (len==-1)
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138 break;
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139 out.write(buffer,0,len);
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140 }
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141 }
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142 else
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143 {
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144 while (true)
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145 {
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146 len=in.read(buffer,0,bufferSize);
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147 if (len==-1)
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148 break;
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149 out.write(buffer,0,len);
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150 }
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151 }
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152 }
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153
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154 /* ------------------------------------------------------------ */
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155 /** Copy files or directories
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156 * @param from
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157 * @param to
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158 * @throws IOException
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159 */
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160 public static void copy(File from,File to) throws IOException
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161 {
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162 if (from.isDirectory())
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163 copyDir(from,to);
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164 else
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165 copyFile(from,to);
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166 }
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167
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168 /* ------------------------------------------------------------ */
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169 public static void copyDir(File from,File to) throws IOException
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170 {
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171 if (to.exists())
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172 {
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173 if (!to.isDirectory())
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174 throw new IllegalArgumentException(to.toString());
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175 }
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176 else
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177 to.mkdirs();
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178
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179 File[] files = from.listFiles();
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180 if (files!=null)
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181 {
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182 for (int i=0;i<files.length;i++)
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183 {
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184 String name = files[i].getName();
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185 if (".".equals(name) || "..".equals(name))
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186 continue;
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187 copy(files[i],new File(to,name));
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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 /* ------------------------------------------------------------ */
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193 public static void copyFile(File from,File to) throws IOException
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194 {
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195 FileInputStream in=new FileInputStream(from);
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196 FileOutputStream out=new FileOutputStream(to);
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197 copy(in,out);
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198 in.close();
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199 out.close();
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200 }
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201
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202
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203 /* ------------------------------------------------------------ */
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204 /**
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205 * closes any {@link Closeable}
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206 *
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207 * @param c the closeable to close
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208 */
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209 public static void close(Closeable c)
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210 {
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211 try
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212 {
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213 if (c != null)
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214 c.close();
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215 }
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216 catch (IOException e)
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217 {
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218 LOG.trace("",e);
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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 * closes an input stream, and logs exceptions
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224 *
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225 * @param is the input stream to close
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226 */
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227 public static void close(InputStream is)
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228 {
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229 try
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230 {
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231 if (is != null)
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232 is.close();
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233 }
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234 catch (IOException e)
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235 {
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236 LOG.trace("",e);
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237 }
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238 }
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239
862
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240 /**
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241 * closes a reader, and logs exceptions
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242 *
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243 * @param reader the reader to close
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244 */
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245 public static void close(Reader reader)
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246 {
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247 try
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248 {
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249 if (reader != null)
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250 reader.close();
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251 } catch (IOException e)
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252 {
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253 LOG.trace("",e);
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254 }
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255 }
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256
862
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257 /**
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258 * closes a writer, and logs exceptions
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259 *
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260 * @param writer the writer to close
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261 */
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262 public static void close(Writer writer)
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263 {
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264 try
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265 {
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266 if (writer != null)
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267 writer.close();
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268 } catch (IOException e)
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269 {
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270 LOG.trace("",e);
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271 }
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272 }
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273
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274 /* ------------------------------------------------------------ */
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275 /**
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276 * closes an output stream, and logs exceptions
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277 *
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278 * @param os the output stream to close
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279 */
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280 public static void close(OutputStream os)
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281 {
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282 try
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283 {
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284 if (os != null)
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285 os.close();
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286 }
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287 catch (IOException e)
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288 {
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289 LOG.trace("",e);
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290 }
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291 }
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292
862
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293 /* ------------------------------------------------------------ */
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294 /**
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295 * @return An outputstream to nowhere
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296 */
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297 public static InputStream getClosedStream()
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298 {
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299 return __closedStream;
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300 }
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301
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302 /* ------------------------------------------------------------ */
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303 /* ------------------------------------------------------------ */
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304 private static class ClosedIS extends InputStream
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305 {
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306 @Override
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307 public int read() throws IOException
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308 {
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309 return -1;
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310 }
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311 }
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312 private static ClosedIS __closedStream = new ClosedIS();
802
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313 }