/*

 * 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

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

 * questions.

 */

/*

 * @test

 * @bug 8025619

 * @summary Verify that a channel obtained from a closed stream is truly closed.

 */

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.RandomAccessFile;

import java.nio.channels.ClosedChannelException;

import java.nio.channels.FileChannel;

public class GetClosedChannel {

    private static final int NUM_CHANNELS = 3;

    private static final int NUM_EXCEPTIONS = 2*NUM_CHANNELS;

    public static void main(String[] args) throws IOException {

        int exceptions = 0;

        int openChannels = 0;

        for (int i = 0; i < NUM_CHANNELS; i++) {

            File f = File.createTempFile("fcbug", ".tmp");

            f.deleteOnExit();

            FileChannel fc = null;

            boolean shared = false;

            switch (i) {

                case 0:

                    System.out.print("FileInputStream...");

                    FileInputStream fis = new FileInputStream(f);

                    fis.close();

                    fc = fis.getChannel();

                    if (fc.isOpen()) {

                        System.err.println("FileInputStream channel should not be open");

                        openChannels++;

                    }

                    shared = true;

                    break;

                case 1:

                    System.out.print("FileOutputStream...");

                    FileOutputStream fos = new FileOutputStream(f);

                    fos.close();

                    fc = fos.getChannel();

                    if (fc.isOpen()) {

                        System.err.println("FileOutputStream channel should not be open");

                        openChannels++;

                    }

                    break;

                case 2:

                    System.out.print("RandomAccessFile...");

                    RandomAccessFile raf = new RandomAccessFile(f, "rw");

                    raf.close();

                    fc = raf.getChannel();

                    if (fc.isOpen()) {

                        System.err.println("RandomAccessFile channel should not be open");

                        openChannels++;

                    }

                    break;

                default:

                    assert false : "Should not get here";

            }

            try {

                long position = fc.position();

                System.err.println("Channel "+i+" position is "+position);

            } catch (ClosedChannelException cce) {

                exceptions++;

            }

            try {

                fc.tryLock(0, Long.MAX_VALUE, shared);

            } catch (ClosedChannelException e) {

                System.out.println("OK");

                exceptions++;

            } catch (Error err) {

                System.err.println(err);

            }

        }

        if (exceptions != NUM_EXCEPTIONS || openChannels != 0) {

            throw new RuntimeException("FAILED:" +

                    " ClosedChannelExceptions: expected: " + NUM_EXCEPTIONS +

                    " actual: " + exceptions + ";" + System.lineSeparator() +

                    " number of open channels: expected: 0 " +

                    " actual: " + openChannels + ".");

        }

    }

}