Mercurial > hg > blitz_condensed
annotate src/com/go/trove/util/ClassInjector.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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1 /* ==================================================================== |
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2 * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group |
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3 * ==================================================================== |
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4 * The Tea Software License, Version 1.1 |
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5 * |
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6 * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved. |
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7 * |
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8 * Redistribution and use in source and binary forms, with or without |
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9 * modification, are permitted provided that the following conditions |
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10 * are met: |
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11 * |
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12 * 1. Redistributions of source code must retain the above copyright |
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13 * notice, this list of conditions and the following disclaimer. |
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14 * |
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15 * 2. Redistributions in binary form must reproduce the above copyright |
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16 * notice, this list of conditions and the following disclaimer in |
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17 * the documentation and/or other materials provided with the |
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18 * distribution. |
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19 * |
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20 * 3. The end-user documentation included with the redistribution, |
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21 * if any, must include the following acknowledgment: |
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22 * "This product includes software developed by the |
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23 * Walt Disney Internet Group (http://opensource.go.com/)." |
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24 * Alternately, this acknowledgment may appear in the software itself, |
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25 * if and wherever such third-party acknowledgments normally appear. |
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26 * |
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27 * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must |
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28 * not be used to endorse or promote products derived from this |
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29 * software without prior written permission. For written |
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30 * permission, please contact opensource@dig.com. |
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31 * |
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32 * 5. Products derived from this software may not be called "Tea", |
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33 * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet", |
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34 * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior |
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35 * written permission of the Walt Disney Internet Group. |
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36 * |
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37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
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38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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40 * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS |
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41 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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42 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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43 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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44 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
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45 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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46 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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47 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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48 * ==================================================================== |
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49 * |
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50 * For more information about Tea, please see http://opensource.go.com/. |
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51 */ |
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52 |
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53 package com.go.trove.util; |
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54 |
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55 import java.io.OutputStream; |
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56 import java.io.ByteArrayOutputStream; |
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57 import java.io.ByteArrayInputStream; |
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58 import java.io.File; |
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59 import java.io.InputStream; |
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60 import java.io.FileInputStream; |
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61 import java.io.IOException; |
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62 import java.lang.ref.*; |
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63 import java.net.URL; |
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64 import java.net.URLConnection; |
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65 import java.net.URLStreamHandler; |
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66 import java.util.*; |
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67 import java.util.zip.GZIPInputStream; |
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68 import java.util.zip.GZIPOutputStream; |
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69 |
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70 /****************************************************************************** |
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71 * A special ClassLoader that allows classes to be defined by directly |
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72 * injecting the bytecode. All classes other than those injected are loaded |
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73 * from the parent ClassLoader, which is the ClassLoader that loaded this |
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74 * class. If a directory is passed in, the ClassInjector looks there for |
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75 * non-injected class files before asking the parent ClassLoader for a class. |
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76 * |
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77 * @author Brian S O'Neill |
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78 * @version |
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79 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 7/30/01 <!-- $--> |
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80 */ |
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81 public class ClassInjector extends ClassLoader { |
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82 private static Map cShared = new NullKeyMap(new IdentityMap()); |
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83 |
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84 /** |
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85 * Returns a shared ClassInjector instance. |
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86 */ |
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87 public static ClassInjector getInstance() { |
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88 return getInstance(null); |
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89 } |
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90 |
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91 /** |
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92 * Returns a shared ClassInjector instance for the given ClassLoader. |
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93 */ |
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94 public static ClassInjector getInstance(ClassLoader loader) { |
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95 ClassInjector injector = null; |
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96 |
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97 synchronized (cShared) { |
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98 Reference ref = (Reference)cShared.get(loader); |
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99 if (ref != null) { |
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100 injector = (ClassInjector)ref.get(); |
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101 } |
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102 if (injector == null) { |
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103 injector = new ClassInjector(loader); |
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104 cShared.put(loader, new WeakReference(injector)); |
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105 } |
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106 return injector; |
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107 } |
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108 } |
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109 |
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110 // Parent ClassLoader, used to load classes that aren't defined by this. |
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111 private ClassLoader mSuperLoader; |
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112 |
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113 private File[] mRootClassDirs; |
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114 private String mRootPackage; |
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115 |
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116 // A set of all the classes defined by the ClassInjector. |
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117 private Map mDefined = Collections.synchronizedMap(new HashMap()); |
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118 |
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119 // A map to store raw bytecode for future use in getResourceAsStream(). |
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120 private Map mGZippedBytecode; |
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121 |
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122 private URLStreamHandler mFaker; |
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123 |
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124 /** |
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125 * Construct a ClassInjector that uses the ClassLoader that loaded this |
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126 * class as a parent, and it has no root class directory or root package. |
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127 */ |
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128 public ClassInjector() { |
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129 this(null, (File[])null, null); |
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130 } |
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131 |
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132 /** |
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133 * Construct a ClassInjector that has no root class directory or root |
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134 * package. |
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135 * |
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136 * @param parent optional parent ClassLoader to default to when a class |
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137 * cannot be loaded with this ClassInjector. |
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138 */ |
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139 public ClassInjector(ClassLoader parent) { |
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140 this(parent, (File[])null, null); |
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141 } |
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142 |
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143 /** |
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144 * Construct a ClassInjector that uses the ClassLoader that loaded this |
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145 * class as a parent. |
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146 * |
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147 * @param rootClassDir optional directory to look for non-injected classes |
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148 * @param rootPackage optional package name for the root directory |
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149 */ |
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150 public ClassInjector(File rootClassDir, String rootPackage) { |
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151 this(null, (rootClassDir == null) ? null : new File[]{rootClassDir}, |
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152 rootPackage); |
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153 } |
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154 |
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155 /** |
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156 * @param parent optional parent ClassLoader to default to when a class |
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157 * cannot be loaded with this ClassInjector. |
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158 * @param rootClassDir optional directory to look for non-injected classes |
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159 * @param rootPackage optional package name for the root directory |
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160 */ |
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161 public ClassInjector(ClassLoader parent, |
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162 File rootClassDir, String rootPackage) { |
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163 this(parent, (rootClassDir == null) ? null : new File[]{rootClassDir}, |
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164 rootPackage); |
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165 } |
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166 |
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167 /** |
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168 * Construct a ClassInjector that uses the ClassLoader that loaded this |
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169 * class as a parent. |
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170 * |
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171 * @param rootClassDirs optional directories to look for non-injected |
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172 * classes |
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173 * @param rootPackage optional package name for the root directory |
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174 */ |
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175 public ClassInjector(File[] rootClassDirs, String rootPackage) { |
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176 this(null, rootClassDirs, rootPackage); |
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177 } |
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178 |
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179 /** |
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180 * @param parent optional parent ClassLoader to default to when a class |
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181 * cannot be loaded with this ClassInjector. |
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182 * @param rootClassDirs optional directories to look for non-injected |
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183 * classes |
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184 * @param rootPackage optional package name for the root directory |
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185 */ |
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186 public ClassInjector(ClassLoader parent, |
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187 File[] rootClassDirs, |
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188 String rootPackage) { |
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189 this(parent, rootClassDirs, rootPackage, false); |
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190 } |
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191 |
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192 /** |
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193 * @param parent optional parent ClassLoader to default to when a class |
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194 * cannot be loaded with this ClassInjector. |
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195 * @param rootClassDirs optional directories to look for non-injected |
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196 * classes |
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197 * @param rootPackage optional package name for the root directory |
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198 * @param keepRawBytecode if true, will cause the ClassInjector to store |
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199 * the raw bytecode of defined classes. |
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200 */ |
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201 public ClassInjector(ClassLoader parent, |
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202 File[] rootClassDirs, |
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203 String rootPackage, |
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204 boolean keepRawBytecode) { |
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205 super(); |
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206 if (parent == null) { |
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207 parent = getClass().getClassLoader(); |
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208 } |
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209 mSuperLoader = parent; |
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210 if (rootClassDirs != null) { |
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211 mRootClassDirs = (File[])rootClassDirs.clone(); |
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212 } |
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213 if (rootPackage != null && !rootPackage.endsWith(".")) { |
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214 rootPackage += '.'; |
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215 } |
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216 mRootPackage = rootPackage; |
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217 |
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218 if (keepRawBytecode) { |
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219 mGZippedBytecode = Collections.synchronizedMap(new HashMap()); |
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220 } |
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221 } |
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222 |
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223 /** |
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224 * Get a stream used to define a class. Close the stream to finish the |
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225 * definition. |
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226 * |
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227 * @param the fully qualified name of the class to be defined. |
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228 */ |
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229 public OutputStream getStream(String name) { |
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230 return new Stream(name); |
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231 } |
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232 |
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233 public URL getResource(String name) { |
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234 |
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235 if (mGZippedBytecode != null) { |
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236 if (mGZippedBytecode.containsKey(name)) { |
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237 try { |
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238 return new URL("file", null, -1, name, getURLFaker()); |
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239 } |
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240 catch (Exception e) { |
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241 e.printStackTrace(); |
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242 } |
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243 System.out.println("created URL for " + name); |
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244 } |
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245 } |
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246 return mSuperLoader.getResource(name); |
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247 } |
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248 |
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249 private URLStreamHandler getURLFaker() { |
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250 if (mFaker == null) { |
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251 mFaker = new URLFaker(); |
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252 } |
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253 return mFaker; |
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254 } |
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255 |
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256 protected Class loadClass(String name, boolean resolve) |
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257 throws ClassNotFoundException { |
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258 |
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259 Class clazz = findLoadedClass(name); |
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260 |
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261 if (clazz == null) { |
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262 synchronized (this) { |
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263 clazz = findLoadedClass(name); |
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264 |
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265 if (clazz == null) { |
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266 clazz = loadFromFile(name); |
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267 |
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268 if (clazz == null) { |
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269 if (mSuperLoader != null) { |
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270 clazz = mSuperLoader.loadClass(name); |
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271 } |
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272 else { |
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273 clazz = findSystemClass(name); |
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274 } |
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275 |
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276 if (clazz == null) { |
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277 throw new ClassNotFoundException(name); |
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278 } |
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279 } |
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280 } |
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281 } |
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282 } |
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283 |
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284 if (resolve) { |
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285 resolveClass(clazz); |
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286 } |
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287 |
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288 return clazz; |
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289 } |
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290 |
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291 protected void define(String name, byte[] data) { |
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292 defineClass(name, data, 0, data.length); |
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293 if (mGZippedBytecode != null) { |
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294 try { |
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295 ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
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296 GZIPOutputStream gz = new GZIPOutputStream(baos); |
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297 gz.write(data,0,data.length); |
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298 gz.close(); |
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299 mGZippedBytecode.put(name.replace('.','/') + ".class", |
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300 baos.toByteArray()); |
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301 } |
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302 catch (IOException ioe) { |
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303 ioe.printStackTrace(); |
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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 private Class loadFromFile(String name) throws ClassNotFoundException { |
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309 if (mRootClassDirs == null) { |
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310 return null; |
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311 } |
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312 |
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313 String fileName = name; |
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314 |
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315 if (mRootPackage != null) { |
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316 if (fileName.startsWith(mRootPackage)) { |
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317 fileName = fileName.substring(mRootPackage.length()); |
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318 } |
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319 else { |
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320 return null; |
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321 } |
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322 } |
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323 |
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324 fileName = fileName.replace('.', File.separatorChar); |
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325 ClassNotFoundException error = null; |
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326 |
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327 for (int i=0; i<mRootClassDirs.length; i++) { |
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328 File file = new File(mRootClassDirs[i], fileName + ".class"); |
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329 |
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330 if (file.exists()) { |
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331 try { |
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332 byte[] buffer = new byte[(int)file.length()]; |
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333 int avail = buffer.length; |
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334 int offset = 0; |
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335 InputStream in = new FileInputStream(file); |
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336 |
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337 int len = -1; |
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338 while ( (len = in.read(buffer, offset, avail)) > 0 ) { |
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339 offset += len; |
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340 |
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341 if ( (avail -= len) <= 0 ) { |
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342 avail = buffer.length; |
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343 byte[] newBuffer = new byte[avail * 2]; |
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344 System.arraycopy(buffer, 0, newBuffer, 0, avail); |
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345 buffer = newBuffer; |
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346 } |
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347 } |
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348 |
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349 in.close(); |
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350 |
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351 return defineClass(name, buffer, 0, offset); |
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352 } |
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353 catch (IOException e) { |
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354 if (error == null) { |
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355 error = new ClassNotFoundException |
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356 (fileName + ": " + e.toString()); |
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357 } |
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358 } |
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359 } |
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360 } |
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361 |
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362 if (error != null) { |
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363 throw error; |
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364 } |
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365 else { |
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366 return null; |
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367 } |
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368 } |
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369 |
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370 private class Stream extends ByteArrayOutputStream { |
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371 private String mName; |
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372 |
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373 public Stream(String name) { |
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374 super(1024); |
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375 mName = name; |
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376 } |
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377 |
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378 public void close() { |
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379 synchronized (mDefined) { |
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380 if (mDefined.get(mName) == null) { |
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381 define(mName, toByteArray()); |
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382 mDefined.put(mName, mName); |
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383 } |
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384 } |
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385 } |
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386 } |
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387 |
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388 private class URLFaker extends URLStreamHandler { |
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389 |
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390 protected URLConnection openConnection(URL u) throws IOException { |
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391 return new ClassInjector.ResourceConnection(u); |
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392 } |
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393 } |
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394 |
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395 private class ResourceConnection extends URLConnection { |
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396 |
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397 String resourceName; |
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398 public ResourceConnection(URL u) { |
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399 super(u); |
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400 resourceName = u.getFile(); |
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401 } |
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402 |
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403 // not really needed here but it was abstract. |
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404 public void connect() {} |
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405 |
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406 public InputStream getInputStream() throws IOException { |
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407 |
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408 try { |
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409 if (mGZippedBytecode != null) { |
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410 |
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411 if (mGZippedBytecode.get(resourceName) != null) { |
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412 return new GZIPInputStream(new ByteArrayInputStream |
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413 ((byte[])mGZippedBytecode.get(resourceName))); |
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414 } |
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415 else { |
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416 System.out.println(resourceName + " not found in bytecode map."); |
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417 } |
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418 } |
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419 else { |
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420 System.out.println("no bytecode map configured in "+ ClassInjector.this); |
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421 } |
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422 } |
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423 catch (Exception e) { |
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424 e.printStackTrace(); |
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425 } |
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426 |
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427 return null; |
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428 } |
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429 } |
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430 } |