/*

 * 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

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

 *

 * 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.

 *

 */

package sun.nio.fs;

import java.nio.file.spi.FileSystemProvider;

import java.security.AccessController;

import java.security.PrivilegedAction;

import sun.security.action.GetPropertyAction;

/**

 * Creates this platform's default FileSystemProvider.

 */

public class DefaultFileSystemProvider {

    private DefaultFileSystemProvider() { }

    @SuppressWarnings("unchecked")

    private static FileSystemProvider createProvider(final String cn) {

        return AccessController

            .doPrivileged(new PrivilegedAction<FileSystemProvider>() {

                public FileSystemProvider run() {

                    Class<FileSystemProvider> c;

                    try {

                        c = (Class<FileSystemProvider>)Class.forName(cn, true, null);

                    } catch (ClassNotFoundException x) {

                        throw new AssertionError(x);

                    }

                    try {

                        return c.newInstance();

                    } catch (IllegalAccessException x) {

                        throw new AssertionError(x);

                    } catch (InstantiationException x) {

                        throw new AssertionError(x);

                    }

            }});

    }

    /**

     * Returns the default FileSystemProvider.

     */

    public static FileSystemProvider create() {

        String osname = AccessController

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

        if (osname.equals("SunOS"))

            return createProvider("sun.nio.fs.SolarisFileSystemProvider");

        if (osname.equals("Linux"))

            return createProvider("sun.nio.fs.LinuxFileSystemProvider");

        throw new AssertionError("Platform not recognized");

    }

}