/hudson-core/src/main/java/hudson/util/MaskingClassLoader.java

 1/*
 2 * The MIT License
 3 *
 4 * Copyright (c) 2004-2009, Sun Microsystems, Inc.
 5 *
 6 * Permission is hereby granted, free of charge, to any person obtaining a copy
 7 * of this software and associated documentation files (the "Software"), to deal
 8 * in the Software without restriction, including without limitation the rights
 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24package hudson.util;
25
26import java.util.Collection;
27
28/**
29 * {@link ClassLoader} that masks a specified set of classes
30 * from its parent class loader.
31 *
32 * <p>
33 * This code is used to create an isolated environment.
34 *
35 * @author Kohsuke Kawaguchi
36 */
37public class MaskingClassLoader extends ClassLoader {
38    /**
39     * Prefix of the packages that should be hidden.
40     */
41    private final String[] masks;
42
43    public MaskingClassLoader(ClassLoader parent, String... masks) {
44        super(parent);
45        this.masks = masks;
46    }
47
48    public MaskingClassLoader(ClassLoader parent, Collection<String> masks) {
49        this(parent, masks.toArray(new String[masks.size()]));
50    }
51
52    @Override
53    protected synchronized Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
54        for (String mask : masks) {
55            if(name.startsWith(mask))
56                throw new ClassNotFoundException();
57        }
58
59        return super.loadClass(name, resolve);
60    }
61}