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1 package org.codehaus.classworlds.uberjar.boot; 2 3 /* 4 $Id: InitialClassLoader.java,v 1.1 2003/09/23 18:11:30 jvanzyl Exp $ 5 6 Copyright 2002 (C) The Werken Company. All Rights Reserved. 7 8 Redistribution and use of this software and associated documentation 9 ("Software"), with or without modification, are permitted provided 10 that the following conditions are met: 11 12 1. Redistributions of source code must retain copyright 13 statements and notices. Redistributions must also contain a 14 copy of this document. 15 16 2. Redistributions in binary form must reproduce the 17 above copyright notice, this list of conditions and the 18 following disclaimer in the documentation and/or other 19 materials provided with the distribution. 20 21 3. The name "classworlds" must not be used to endorse or promote 22 products derived from this Software without prior written 23 permission of The Werken Company. For written permission, 24 please contact bob@werken.com. 25 26 4. Products derived from this Software may not be called "classworlds" 27 nor may "classworlds" appear in their names without prior written 28 permission of The Werken Company. "classworlds" is a registered 29 trademark of The Werken Company. 30 31 5. Due credit should be given to The Werken Company. 32 (http://classworlds.werken.com/). 33 34 THIS SOFTWARE IS PROVIDED BY THE WERKEN COMPANY AND CONTRIBUTORS 35 ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT 36 NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 37 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 38 THE WERKEN COMPANY OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 39 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 40 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 41 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 42 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 43 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 44 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 45 OF THE POSSIBILITY OF SUCH DAMAGE. 46 47 */ 48 49 import java.io.ByteArrayOutputStream; 50 import java.io.IOException; 51 import java.net.URL; 52 import java.security.SecureClassLoader; 53 import java.util.Map; 54 import java.util.HashMap; 55 import java.util.jar.JarInputStream; 56 import java.util.jar.JarEntry; 57 58 /*** Initial bootstrapping <code>ClassLoader</code>. 59 * 60 * @author <a href="mailto:jason@zenplex.com">Jason van Zyl</a> 61 * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a> 62 * 63 * @version $Id: InitialClassLoader.java,v 1.1 2003/09/23 18:11:30 jvanzyl Exp $ 64 */ 65 public class InitialClassLoader 66 extends SecureClassLoader 67 { 68 // ---------------------------------------------------------------------- 69 // Instance members 70 // ---------------------------------------------------------------------- 71 72 /*** Class index. */ 73 private Map index; 74 75 /*** Classworlds jar URL. */ 76 private URL classworldsJarUrl; 77 78 // ---------------------------------------------------------------------- 79 // Constructors 80 // ---------------------------------------------------------------------- 81 82 /*** Construct. 83 * 84 * @throws Exception If an error occurs while attempting to perform 85 * bootstrap initialization. 86 */ 87 public InitialClassLoader() 88 throws Exception 89 { 90 this.index = new HashMap(); 91 92 ClassLoader cl = Thread.currentThread().getContextClassLoader(); 93 94 URL classUrl = getClass().getResource( "InitialClassLoader.class" ); 95 96 String urlText = classUrl.toExternalForm(); 97 98 int bangLoc = urlText.indexOf( "!" ); 99 100 System.setProperty( "classworlds.lib", 101 urlText.substring( 0, 102 bangLoc ) + "!/WORLDS-INF/lib" ); 103 104 this.classworldsJarUrl = new URL( urlText.substring( 0, 105 bangLoc ) + "!/WORLDS-INF/classworlds.jar" ); 106 } 107 108 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 109 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 110 111 /*** @see ClassLoader 112 */ 113 public synchronized Class findClass(String className) 114 throws ClassNotFoundException 115 { 116 String classPath = className.replace( '.', 117 '/' ) + ".class"; 118 119 if ( this.index.containsKey( classPath ) ) 120 { 121 return (Class) this.index.get( classPath ); 122 } 123 124 try 125 { 126 JarInputStream in = new JarInputStream( this.classworldsJarUrl.openStream() ); 127 128 try 129 { 130 JarEntry entry = null; 131 132 while ((entry = in.getNextJarEntry()) != null) 133 { 134 if ( entry.getName().equals( classPath ) ) 135 { 136 ByteArrayOutputStream out = new ByteArrayOutputStream(); 137 138 try 139 { 140 byte[] buffer = new byte[ 2048 ]; 141 142 int read = 0; 143 144 while ( in.available() > 0 ) 145 { 146 read = in.read( buffer, 147 0, 148 buffer.length ); 149 150 if ( read < 0 ) 151 { 152 break; 153 } 154 155 out.write( buffer, 156 0, 157 read ); 158 } 159 160 buffer = out.toByteArray(); 161 162 Class cls = defineClass( className, 163 buffer, 164 0, 165 buffer.length ); 166 167 this.index.put( className, 168 cls ); 169 170 return cls; 171 } 172 finally 173 { 174 out.close(); 175 } 176 } 177 } 178 } 179 finally 180 { 181 in.close(); 182 } 183 } 184 catch (IOException e) 185 { 186 e.printStackTrace(); 187 throw new ClassNotFoundException( "io error reading stream for: " + className ); 188 } 189 190 throw new ClassNotFoundException( className ); 191 } 192 }

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