1 /* 2 * Copyright (c) 2011, 2018, 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 24 package vm.mlvm.share; 25 26 import java.io.IOException; 27 28 import vm.share.FileUtils; 29 30 public class CustomClassLoaders { 31 32 public static ClassLoader makeClassBytesLoader(final byte[] classBytes, 33 final String className) { 34 return new ClassLoader() { 35 @Override 36 protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException { 37 Env.traceDebug("Custom loader: requested=" + name + "; can supply=" + className); 38 39 if (!name.equals(className)) 40 return super.loadClass(name, resolve); 41 42 Env.traceDebug("Custom loader: defining " + className + " (" + classBytes.length + ") bytes"); 43 44 return defineClass(className, classBytes, 0, classBytes.length); 45 } 46 }; 47 } 48 49 public static ClassLoader makeCustomClassLoader(final String forClassName) throws IOException { 50 return makeClassBytesLoader(FileUtils.readClass(forClassName), forClassName); 51 } 52 }