/*

 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

import java.io.PrintStream;

/*

 * Custom system class loader.

 */

public class CustomLoader extends ClassLoader {

    private static PrintStream out = System.out;

    public  static ClassLoader INSTANCE;

    public CustomLoader(ClassLoader classLoader) {

        super("CustomSystemLoader", classLoader);

        assert INSTANCE == null;

        INSTANCE = this;

        // test cases to validate that ClassLoader::getSystemClassLoader

        // is not triggered during custom system class loader initialization

        testEnumValueOf();

    }

    static void testEnumValueOf() {

        TestEnum e = java.lang.Enum.valueOf(TestEnum.class, "C1");

        if (e != TestEnum.C1) {

            throw new RuntimeException("Expected: " + TestEnum.C1 + " got: " + e);

        }

    }

    @Override

    public Class<?> loadClass(String name) throws ClassNotFoundException {

        out.println("CustomLoader: loading class: " + name);

        return super.loadClass(name);

    }

    static enum TestEnum {

        C1, C2, C3

    }

}