| /* |
| * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package utils; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.FileInputStream; |
| |
| public class ClassLoadUtils { |
| |
| private ClassLoadUtils() { |
| } |
| |
| /** |
| * Get filename of class file from classpath for given class name. |
| * |
| * @param className class name |
| * @return filename or null if not found |
| */ |
| public static String getClassPath(String className) { |
| String fileName = className.replace(".", File.separator) + ".class"; |
| String[] classPath = System.getProperty("java.class.path").split(File.pathSeparator); |
| File target = null; |
| int i; |
| for (i = 0; i < classPath.length; ++i) { |
| target = new File(classPath[i] + File.separator + fileName); |
| System.out.println("Try: " + target); |
| if (target.exists()) { |
| break; |
| } |
| } |
| if (i != classPath.length) { |
| return classPath[i]; |
| } |
| return null; |
| } |
| |
| /** |
| * Get filename of class file from classpath for given class name. |
| * |
| * @param className class name |
| * @return filename or null if not found |
| */ |
| public static String getClassPathFileName(String className) { |
| String fileName = className.replace(".", File.separator) + ".class"; |
| String[] classPath = System.getProperty("java.class.path").split(File.pathSeparator); |
| File target = null; |
| int i; |
| for (i = 0; i < classPath.length; ++i) { |
| target = new File(classPath[i] + File.separator + fileName); |
| System.out.println("Try: " + target); |
| if (target.exists()) { |
| break; |
| } |
| } |
| if (i != classPath.length) { |
| try { |
| return target.getCanonicalPath(); |
| } catch (IOException e) { |
| return null; |
| } |
| } |
| return null; |
| } |
| |
| public static String getRedefineClassFileName(String dir, String className) { |
| String fileName = getClassPathFileName(className); |
| if (fileName == null) { |
| return null; |
| } |
| if (fileName.contains("classes")) { |
| return fileName.replace("classes", dir); |
| } else { |
| String classPath = getClassPath(className); |
| if (classPath != null) { |
| return classPath + File.separator + "newclass" + File.separator + className.replace(".", File.separator) + ".class"; |
| } else { |
| return null; |
| } |
| } |
| } |
| |
| /** |
| * Get filename of class file which is to be redefined. |
| */ |
| public static String getRedefineClassFileName(String className) { |
| return getRedefineClassFileName("newclass", className); |
| } |
| |
| /** |
| * Read whole file. |
| * |
| * @param file file |
| * @return contents of file as byte array |
| */ |
| public static byte[] readFile(File file) throws IOException { |
| InputStream in = new FileInputStream(file); |
| long countl = file.length(); |
| if (countl > Integer.MAX_VALUE) { |
| throw new IOException("File is too huge"); |
| } |
| int count = (int) countl; |
| byte[] buffer = new byte[count]; |
| int n = 0; |
| try { |
| while (n < count) { |
| int k = in.read(buffer, n, count - n); |
| if (k < 0) { |
| throw new IOException("Unexpected EOF"); |
| } |
| n += k; |
| } |
| } finally { |
| in.close(); |
| } |
| return buffer; |
| } |
| |
| /** |
| * Read whole file. |
| * |
| * @param name file name |
| * @return contents of file as byte array |
| */ |
| public static byte[] readFile(String name) throws IOException { |
| return readFile(new File(name)); |
| } |
| } |