1 /* 2 * Copyright (c) 2000, 2004, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 package sun.rmi.rmic.iiop; 26 27 import java.io.*; 28 import sun.tools.java.ClassPath ; 29 import sun.tools.java.ClassFile ; 30 31 /** 32 * A ClassLoader that will ultimately use a given sun.tools.java.ClassPath to 33 * find the desired file. This works for any JAR files specified in the given 34 * ClassPath as well -- reusing all of that wonderful sun.tools.java code. 35 * 36 *@author Everett Anderson 37 */ 38 public class ClassPathLoader extends ClassLoader 39 { 40 private ClassPath classPath; 41 42 public ClassPathLoader(ClassPath classPath) { 43 this.classPath = classPath; 44 } 45 46 // Called by the super class 47 protected Class findClass(String name) throws ClassNotFoundException 48 { 49 byte[] b = loadClassData(name); 50 return defineClass(name, b, 0, b.length); 51 } 52 53 /** 54 * Load the class with the given fully qualified name from the ClassPath. 55 */ 56 private byte[] loadClassData(String className) 57 throws ClassNotFoundException 58 { 59 // Build the file name and subdirectory from the 60 // class name 61 String filename = className.replace('.', File.separatorChar) 62 + ".class"; 63 64 // Have ClassPath find the file for us, and wrap it in a 65 // ClassFile. Note: This is where it looks inside jar files that 66 // are specified in the path. 67 ClassFile classFile = classPath.getFile(filename); 68 69 if (classFile != null) { 70 71 // Provide the most specific reason for failure in addition 72 // to ClassNotFound 73 Exception reportedError = null; 74 byte data[] = null; 75 76 try { 77 // ClassFile is beautiful because it shields us from 78 // knowing if it's a separate file or an entry in a 79 // jar file. 80 DataInputStream input 81 = new DataInputStream(classFile.getInputStream()); 82 83 // Can't rely on input available() since it will be 84 // something unusual if it's a jar file! May need 85 // to worry about a possible problem if someone 86 // makes a jar file entry with a size greater than 87 // max int. 88 data = new byte[(int)classFile.length()]; 89 90 try { 91 input.readFully(data); 92 } catch (IOException ex) { 93 // Something actually went wrong reading the file. This 94 // is a real error so save it to report it. 95 data = null; 96 reportedError = ex; 97 } finally { 98 // Just don't care if there's an exception on close! 99 // I hate that close can throw an IOException! 100 try { input.close(); } catch (IOException ex) {} 101 } 102 } catch (IOException ex) { 103 // Couldn't get the input stream for the file. This is 104 // probably also a real error. 105 reportedError = ex; 106 } 107 108 if (data == null) 109 throw new ClassNotFoundException(className, reportedError); 110 111 return data; 112 } 113 114 // Couldn't find the file in the class path. 115 throw new ClassNotFoundException(className); 116 } 117 }