1 package org.codehaus.plexus.compiler.javac;
2
3 /**
4 * The MIT License
5 *
6 * Copyright (c) 2005, The Codehaus
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a copy of
9 * this software and associated documentation files (the "Software"), to deal in
10 * the Software without restriction, including without limitation the rights to
11 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
12 * of the Software, and to permit persons to whom the Software is furnished to do
13 * so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included in all
16 * copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
24 * SOFTWARE.
25 */
26 import java.net.URL;
27 import java.net.URLClassLoader;
28
29 public class IsolatedClassLoader extends URLClassLoader {
30 private ClassLoader parentClassLoader = ClassLoader.getSystemClassLoader();
31
32 public IsolatedClassLoader() {
33 super(new URL[0], null);
34 }
35
36 public void addURL(URL url) {
37 super.addURL(url);
38 }
39
40 public synchronized Class<?> loadClass(String className) throws ClassNotFoundException {
41 Class<?> c = findLoadedClass(className);
42
43 ClassNotFoundException ex = null;
44
45 if (c == null) {
46 try {
47 c = findClass(className);
48 } catch (ClassNotFoundException e) {
49 ex = e;
50
51 if (parentClassLoader != null) {
52 c = parentClassLoader.loadClass(className);
53 }
54 }
55 }
56
57 if (c == null) {
58 throw ex;
59 }
60
61 return c;
62 }
63 }