01: /* Copyright (C) 2004 - 2007 db4objects Inc. http://www.db4o.com
02:
03: This file is part of the db4o open source object database.
04:
05: db4o is free software; you can redistribute it and/or modify it under
06: the terms of version 2 of the GNU General Public License as published
07: by the Free Software Foundation and as clarified by db4objects' GPL
08: interpretation policy, available at
09: http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
10: Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
11: Suite 350, San Mateo, CA 94403, USA.
12:
13: db4o is distributed in the hope that it will be useful, but WITHOUT ANY
14: WARRANTY; without even the implied warranty of MERCHANTABILITY or
15: FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16: for more details.
17:
18: You should have received a copy of the GNU General Public License along
19: with this program; if not, write to the Free Software Foundation, Inc.,
20: 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21: package com.db4o.test.util;
22:
23: import java.net.*;
24:
25: import com.db4o.foundation.*;
26:
27: public class ExcludingClassLoader extends URLClassLoader {
28: private Collection4 _excludedNames;
29:
30: public ExcludingClassLoader(ClassLoader parent,
31: Class[] excludedClasses) {
32: this (parent, collectNames(excludedClasses));
33: }
34:
35: public ExcludingClassLoader(ClassLoader parent,
36: Collection4 excludedNames) {
37: super (new URL[] {}, parent);
38: this ._excludedNames = excludedNames;
39: }
40:
41: protected synchronized Class loadClass(String name, boolean resolve)
42: throws ClassNotFoundException {
43: if (_excludedNames.contains(name)) {
44: throw new ClassNotFoundException(name);
45: }
46: return super .loadClass(name, resolve);
47: }
48:
49: private static Collection4 collectNames(Class[] classes) {
50: Collection4 names = new Collection4();
51: for (int classIdx = 0; classIdx < classes.length; classIdx++) {
52: names.add(classes[classIdx].getName());
53: }
54: return names;
55: }
56:
57: public static void main(String[] args) throws Exception {
58: ClassLoader parent = ExcludingClassLoader.class
59: .getClassLoader();
60: String excName = ExcludingClassLoader.class.getName();
61: Collection4 excluded = new Collection4();
62: ClassLoader incLoader = new ExcludingClassLoader(parent,
63: excluded);
64: System.out.println(incLoader.loadClass(excName));
65: excluded.add(excName);
66: try {
67: System.out.println(incLoader.loadClass(excName));
68: } catch (ClassNotFoundException exc) {
69: System.out.println("Ok, not found.");
70: }
71: }
72: }
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