/*

 * Copyright (c) 2014, 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

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 */

import java.io.ByteArrayInputStream;

import java.io.IOException;

import java.io.InputStream;

import java.lang.reflect.Constructor;

import java.lang.reflect.Method;

/*

 * @test

 * @bug 8067870

 * @modules java.base/java.io:open

 * @summary verifies java.io.ObjectInputStream.PeekInputStream.skip works

 *          as intended

 */

public class PeekInputStreamTest {

    public static void main(String[] args) throws ReflectiveOperationException,

            IOException {

        InputStream pin = createPeekInputStream(

                new ByteArrayInputStream(new byte[]{1, 2, 3, 4}));

        peek(pin);

        if (pin.skip(1) != 1 || pin.read() != 2)

            throw new AssertionError();

        InputStream pin1 = createPeekInputStream(

                new ByteArrayInputStream(new byte[]{1, 2, 3, 4}));

        if (pin1.skip(1) != 1 || pin1.read() != 2)

            throw new AssertionError();

        InputStream pin2 = createPeekInputStream(

                new ByteArrayInputStream(new byte[]{1, 2, 3, 4}));

        if (pin2.skip(0) != 0 || pin2.read() != 1)

            throw new AssertionError();

        InputStream pin3 = createPeekInputStream(

                new ByteArrayInputStream(new byte[]{1, 2, 3, 4}));

        if (pin3.skip(2) != 2 || pin3.read() != 3)

            throw new AssertionError();

        InputStream pin4 = createPeekInputStream(

                new ByteArrayInputStream(new byte[]{1, 2, 3, 4}));

        if (pin4.skip(3) != 3 || pin4.read() != 4)

            throw new AssertionError();

        InputStream pin5 = createPeekInputStream(

                new ByteArrayInputStream(new byte[]{1, 2, 3, 4}));

        if (pin5.skip(16) != 4 || pin5.read() != -1)

            throw new AssertionError();

    }

    private static InputStream createPeekInputStream(InputStream underlying)

            throws ReflectiveOperationException {

        Class<? extends InputStream> clazz =

                Class.forName("java.io.ObjectInputStream$PeekInputStream")

                        .asSubclass(InputStream.class);

        Constructor<? extends InputStream> ctr =

                clazz.getDeclaredConstructor(InputStream.class);

        ctr.setAccessible(true);

        return ctr.newInstance(underlying);

    }

    private static void peek(InputStream pin)

            throws ReflectiveOperationException {

        Method p = pin.getClass().getDeclaredMethod("peek");

        p.setAccessible(true);

        p.invoke(pin);

    }

}