/*

 * Copyright (c) 2008, 2013, 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.fs;

import java.nio.file.*;

import java.io.IOException;

import java.util.*;

import static sun.nio.fs.LinuxNativeDispatcher.*;

/**

 * Linux implementation of FileSystem

 */

class LinuxFileSystem extends UnixFileSystem {

    LinuxFileSystem(UnixFileSystemProvider provider, String dir) {

        super(provider, dir);

    }

    @Override

    public WatchService newWatchService()

        throws IOException

    {

        // assume 2.6.13 or newer

        return new LinuxWatchService(this);

    }

    // lazy initialization of the list of supported attribute views

    private static class SupportedFileFileAttributeViewsHolder {

        static final Set<String> supportedFileAttributeViews =

            supportedFileAttributeViews();

        private static Set<String> supportedFileAttributeViews() {

            Set<String> result = new HashSet<>();

            result.addAll(standardFileAttributeViews());

            // additional Linux-specific views

            result.add("dos");

            result.add("user");

            return Collections.unmodifiableSet(result);

        }

    }

    @Override

    public Set<String> supportedFileAttributeViews() {

        return SupportedFileFileAttributeViewsHolder.supportedFileAttributeViews;

    }

    @Override

    void copyNonPosixAttributes(int ofd, int nfd) {

        LinuxUserDefinedFileAttributeView.copyExtendedAttributes(ofd, nfd);

    }

    /**

     * Returns object to iterate over the mount entries in the given fstab file.

     */

    Iterable<UnixMountEntry> getMountEntries(String fstab) {

        ArrayList<UnixMountEntry> entries = new ArrayList<>();

        try {

            long fp = setmntent(Util.toBytes(fstab), Util.toBytes("r"));

            try {

                for (;;) {

                    UnixMountEntry entry = new UnixMountEntry();

                    int res = getmntent(fp, entry);

                    if (res < 0)

                        break;

                    entries.add(entry);

                }

            } finally {

                endmntent(fp);

            }

        } catch (UnixException x) {

            // nothing we can do

        }

        return entries;

    }

    /**

     * Returns object to iterate over the mount entries in /etc/mtab

     */

    @Override

    Iterable<UnixMountEntry> getMountEntries() {

        return getMountEntries("/etc/mtab");

    }

    @Override

    FileStore getFileStore(UnixMountEntry entry) throws IOException {

        return new LinuxFileStore(this, entry);

    }

}