FilterClassLoader.java revision 2610:d4c30fc77c75 
1/*
2 * Copyright (c) 2014, 2017, 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
24package jdk.test.lib.classloader;
25
26import java.util.function.Predicate;
27/**
28 * A classloader, which using target classloader in case provided condition
29 * for class name is met, and using parent otherwise
30 */
31public class FilterClassLoader extends ClassLoader {
32
33    private final ClassLoader target;
34    private final Predicate<String> condition;
35
36    public FilterClassLoader(ClassLoader target, ClassLoader parent,
37            Predicate<String> condition) {
38        super(parent);
39        this.condition = condition;
40        this.target = target;
41    }
42
43    @Override
44    public Class<?> loadClass(String name) throws ClassNotFoundException {
45        if (condition.test(name)) {
46            return target.loadClass(name);
47        }
48        return super.loadClass(name);
49    }
50}
51