1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 package com.sun.tools.internal.xjc.api.util; |
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27 |
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28 import java.io.ByteArrayOutputStream; |
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29 import java.io.IOException; |
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30 import java.io.InputStream; |
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31 import java.io.File; |
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32 import java.net.URL; |
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33 import java.net.URLClassLoader; |
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34 import java.net.MalformedURLException; |
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35 |
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36 import com.sun.istack.internal.Nullable; |
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37 |
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38 /** |
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39 * {@link ClassLoader} that loads Annotation Processing and specified classes |
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40 * both into the same classloader, so that they can reference each other. |
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41 * |
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42 * @author Bhakti Mehta |
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43 * @since 2.0 beta |
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44 */ |
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45 public final class ApClassLoader extends URLClassLoader { |
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46 /** |
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47 * List of package prefixes we want to mask the |
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48 * parent classLoader from loading |
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49 */ |
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50 private final String[] packagePrefixes; |
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51 |
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52 /** |
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53 * |
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54 * @param packagePrefixes |
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55 * The package prefixes that are forced to resolve within this class loader. |
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56 * @param parent |
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57 * The parent class loader to delegate to. Null to indicate bootstrap classloader. |
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58 */ |
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59 public ApClassLoader(@Nullable ClassLoader parent, String[] packagePrefixes) throws ToolsJarNotFoundException { |
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60 super(getToolsJar(parent),parent); |
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61 if(getURLs().length==0) |
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62 // if tools.jar was found in our classloader, no need to create |
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63 // a parallel classes |
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64 this.packagePrefixes = new String[0]; |
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65 else |
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66 this.packagePrefixes = packagePrefixes; |
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67 } |
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68 |
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69 public Class loadClass(String className) throws ClassNotFoundException { |
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70 for( String prefix : packagePrefixes ) { |
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71 if (className.startsWith(prefix) ) { |
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72 // we need to load those classes in this class loader |
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73 // without delegation. |
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74 return findClass(className); |
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75 } |
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76 } |
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77 |
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78 return super.loadClass(className); |
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79 |
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80 } |
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81 |
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82 protected Class findClass(String name) throws ClassNotFoundException { |
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83 |
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84 StringBuilder sb = new StringBuilder(name.length() + 6); |
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85 sb.append(name.replace('.','/')).append(".class"); |
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86 |
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87 InputStream is = getResourceAsStream(sb.toString()); |
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88 if (is==null) |
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89 throw new ClassNotFoundException("Class not found" + sb); |
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90 |
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91 try { |
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92 ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
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93 byte[] buf = new byte[1024]; |
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94 int len; |
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95 while((len=is.read(buf))>=0) |
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96 baos.write(buf,0,len); |
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97 |
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98 buf = baos.toByteArray(); |
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99 |
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100 // define package if not defined yet |
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101 int i = name.lastIndexOf('.'); |
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102 if (i != -1) { |
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103 String pkgname = name.substring(0, i); |
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104 Package pkg = getPackage(pkgname); |
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105 if(pkg==null) |
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106 definePackage(pkgname, null, null, null, null, null, null, null); |
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107 } |
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108 |
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109 return defineClass(name,buf,0,buf.length); |
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110 } catch (IOException e) { |
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111 throw new ClassNotFoundException(name,e); |
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112 } finally { |
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113 try { |
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114 is.close(); |
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115 } catch (IOException ioe) { |
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116 //ignore |
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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 * Returns a class loader that can load classes from JDK tools.jar. |
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123 * @param parent |
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124 */ |
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125 private static URL[] getToolsJar(@Nullable ClassLoader parent) throws ToolsJarNotFoundException { |
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126 |
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127 try { |
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128 Class.forName("com.sun.tools.javac.Main", false, parent); |
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129 return new URL[0]; |
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130 // we can already load them in the parent class loader. |
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131 // so no need to look for tools.jar. |
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132 // this happens when we are run inside IDE/Ant, or |
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133 // in Mac OS. |
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134 } catch (ClassNotFoundException e) { |
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135 // otherwise try to find tools.jar |
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136 } |
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137 |
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138 File jreHome = new File(System.getProperty("java.home")); |
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139 File toolsJar = new File( jreHome.getParent(), "lib/tools.jar" ); |
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140 |
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141 if (!toolsJar.exists()) { |
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142 throw new ToolsJarNotFoundException(toolsJar); |
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143 } |
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144 |
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145 try { |
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146 return new URL[]{toolsJar.toURL()}; |
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147 } catch (MalformedURLException e) { |
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148 // impossible |
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149 throw new AssertionError(e); |
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150 } |
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151 } |
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152 } |
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