1 /* 2 * Copyright (c) 2015, 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. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package jdk.test.lib.classloader; 24 25 import java.io.File; 26 import java.io.IOException; 27 import java.io.InputStream; 28 import java.io.FileInputStream; 29 30 public class ClassLoadUtils { 31 32 private ClassLoadUtils() { 33 } 34 35 /** 36 * Get filename of class file from classpath for given class name. 37 * 38 * @param className class name 39 * @return filename or null if not found 40 */ 41 public static String getClassPath(String className) { 42 String fileName = className.replace(".", File.separator) + ".class"; 43 String[] classPath = System.getProperty("java.class.path").split(File.pathSeparator); 44 File target = null; 45 int i; 46 for (i = 0; i < classPath.length; ++i) { 47 target = new File(classPath[i] + File.separator + fileName); 48 System.out.println("Try: " + target); 49 if (target.exists()) { 50 break; 51 } 52 } 53 if (i != classPath.length) { 54 return classPath[i]; 55 } 56 return null; 57 } 58 59 /** 60 * Get filename of class file from classpath for given class name. 61 * 62 * @param className class name 63 * @return filename or null if not found 64 */ 65 public static String getClassPathFileName(String className) { 66 String fileName = className.replace(".", File.separator) + ".class"; 67 String[] classPath = System.getProperty("java.class.path").split(File.pathSeparator); 68 File target = null; 69 int i; 70 for (i = 0; i < classPath.length; ++i) { 71 target = new File(classPath[i] + File.separator + fileName); 72 System.out.println("Try: " + target); 73 if (target.exists()) { 74 break; 75 } 76 } 77 if (i != classPath.length) { 78 try { 79 return target.getCanonicalPath(); 80 } catch (IOException e) { 81 return null; 82 } 83 } 84 return null; 85 } 86 87 public static String getRedefineClassFileName(String dir, String className) { 88 String fileName = getClassPathFileName(className); 89 if (fileName == null) { 90 return null; 91 } 92 if (fileName.contains("classes")) { 93 return fileName.replace("classes", dir); 94 } else { 95 String classPath = getClassPath(className); 96 if (classPath != null) { 97 return classPath + File.separator + "newclass" + File.separator + className.replace(".", File.separator) + ".class"; 98 } else { 99 return null; 100 } 101 } 102 } 103 104 /** 105 * Get filename of class file which is to be redefined. 106 */ 107 public static String getRedefineClassFileName(String className) { 108 return getRedefineClassFileName("newclass", className); 109 } 110 111 /** 112 * Read whole file. 113 * 114 * @param file file 115 * @return contents of file as byte array 116 */ 117 public static byte[] readFile(File file) throws IOException { 118 InputStream in = new FileInputStream(file); 119 long countl = file.length(); 120 if (countl > Integer.MAX_VALUE) { 121 throw new IOException("File is too huge"); 122 } 123 int count = (int) countl; 124 byte[] buffer = new byte[count]; 125 int n = 0; 126 try { 127 while (n < count) { 128 int k = in.read(buffer, n, count - n); 129 if (k < 0) { 130 throw new IOException("Unexpected EOF"); 131 } 132 n += k; 133 } 134 } finally { 135 in.close(); 136 } 137 return buffer; 138 } 139 140 /** 141 * Read whole file. 142 * 143 * @param name file name 144 * @return contents of file as byte array 145 */ 146 public static byte[] readFile(String name) throws IOException { 147 return readFile(new File(name)); 148 } 149 }