1 /* 2 * Copyright (c) 2014, 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 25 import java.util.ArrayList; 26 import java.util.Arrays; 27 import java.util.HashMap; 28 29 30 public class ByteCodeClassLoader extends ClassLoader { 31 ArrayList<ClassConstruct> classes = new ArrayList<>(); 32 HashMap<String, Class> loadedClasses = new HashMap<>(); 33 34 public void addClasses(ClassConstruct... classes) { 35 this.classes.addAll(Arrays.asList(classes)); 36 } 37 38 public void loadAll() throws ClassNotFoundException { 39 for (ClassConstruct clazz : classes) { 40 findClass(clazz.getDottedName()); 41 } 42 } 43 44 45 @Override 46 public Class findClass(String name) throws ClassNotFoundException { 47 48 Class cls = loadedClasses.get(name); 49 50 if (cls != null) { 51 return cls; 52 } 53 54 for (ClassConstruct clazz : classes) { 55 if (clazz.getDottedName().equals(name)) { 56 return load(clazz); 57 } 58 } 59 60 throw new ClassNotFoundException(name); 61 } 62 63 @Override 64 public Class loadClass(String name) throws ClassNotFoundException { 65 try { 66 return findClass(name); 67 } catch (ClassNotFoundException e) { 68 return super.loadClass(name); 69 } 70 } 71 72 private Class load(ClassConstruct clazz) { 73 byte[] bytecode = clazz.generateBytes(); 74 Class loadedClass = defineClass(clazz.getDottedName(), bytecode, 0, bytecode.length); 75 loadedClasses.put(clazz.getDottedName(), loadedClass); 76 return loadedClass; 77 } 78 }