1/*
2 * Copyright (c) 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
24import java.io.PrintStream;
25
26/*
27 * Custom system class loader.
28 */
29public class CustomLoader extends ClassLoader {
30    private static PrintStream out = System.out;
31    public  static ClassLoader INSTANCE;
32
33    public CustomLoader(ClassLoader classLoader) {
34        super("CustomSystemLoader", classLoader);
35        assert INSTANCE == null;
36        INSTANCE = this;
37
38        // test cases to validate that ClassLoader::getSystemClassLoader
39        // is not triggered during custom system class loader initialization
40        testEnumValueOf();
41    }
42
43    static void testEnumValueOf() {
44        TestEnum e = java.lang.Enum.valueOf(TestEnum.class, "C1");
45        if (e != TestEnum.C1) {
46            throw new RuntimeException("Expected: " + TestEnum.C1 + " got: " + e);
47        }
48    }
49
50    @Override
51    public Class<?> loadClass(String name) throws ClassNotFoundException {
52        out.println("CustomLoader: loading class: " + name);
53        return super.loadClass(name);
54    }
55
56    static enum TestEnum {
57        C1, C2, C3
58    }
59}
60