/*

 * Copyright (c) 2000, 2012, 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 utilities

 *

 */

import java.io.*;

import java.net.*;

import java.nio.channels.*;

import java.util.Random;

public class TestUtil {

    // Test hosts used by the channels tests - change these when

    // executing in a different network.

    public static final String UNRESOLVABLE_HOST = "blah-blah.blah-blah.blah";

    private TestUtil() { }

    // Repeatedly try random ports until we bind to one.  You might be tempted

    // to do this:

    //

    //     ServerSocketChannel ssc = ServerSocketChannel.open();

    //     ssc.socket().bind(new InetSocketAddress(0));

    //     SocketAddress sa = ssc.socket().getLocalSocketAddress();

    //

    // but unfortunately it doesn't work on NT 4.0.

    //

    // Returns the bound port.

    //

    static int bind(ServerSocketChannel ssc) throws IOException {

        InetAddress lh = InetAddress.getLocalHost();

        Random r = new Random();

        for (;;) {

            int p = r.nextInt((1 << 16) - 1024) + 1024;

            InetSocketAddress isa = new InetSocketAddress(lh, p);

            try {

                ssc.socket().bind(isa);

            } catch (IOException x) {

                continue;

            }

            return p;

        }

    }

    // A more convenient form of bind(ServerSocketChannel) that returns a full

    // socket address.

    //

    static InetSocketAddress bindToRandomPort(ServerSocketChannel ssc)

        throws IOException

    {

        int p = bind(ssc);

        return new InetSocketAddress(InetAddress.getLocalHost(), p);

    }

    private static String osName = System.getProperty("os.name");

    static boolean onSolaris() {

        return osName.startsWith("SunOS");

    }

    static boolean onWindows() {

        return osName.startsWith("Windows");

    }

}