/*

 * Copyright (c) 2001, 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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * 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.

 */

package sun.nio.ch;

import java.nio.channels.spi.SelectorProvider;

import java.security.AccessController;

import sun.security.action.GetPropertyAction;

/**

 * Creates this platform's default SelectorProvider

 */

public class DefaultSelectorProvider {

    /**

     * Prevent instantiation.

     */

    private DefaultSelectorProvider() { }

    @SuppressWarnings("unchecked")

    private static SelectorProvider createProvider(String cn) {

        Class<SelectorProvider> c;

        try {

            c = (Class<SelectorProvider>)Class.forName(cn);

        } catch (ClassNotFoundException x) {

            throw new AssertionError(x);

        }

        try {

            return c.newInstance();

        } catch (IllegalAccessException | InstantiationException x) {

            throw new AssertionError(x);

        }

    }

    /**

     * Returns the default SelectorProvider.

     */

    public static SelectorProvider create() {

        String osname = AccessController

            .doPrivileged(new GetPropertyAction("os.name"));

        if (osname.equals("SunOS"))

            return createProvider("sun.nio.ch.DevPollSelectorProvider");

        if (osname.equals("Linux"))

            return createProvider("sun.nio.ch.EPollSelectorProvider");

        return new sun.nio.ch.PollSelectorProvider();

    }

}