/*

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 *   - Redistributions of source code must retain the above copyright

 *     notice, this list of conditions and the following disclaimer.

 *

 *   - Redistributions in binary form must reproduce the above copyright

 *     notice, this list of conditions and the following disclaimer in the

 *     documentation and/or other materials provided with the distribution.

 *

 *   - Neither the name of Oracle nor the names of its

 *     contributors may be used to endorse or promote products derived

 *     from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS

 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

import java.nio.file.*;

import java.nio.file.attribute.*;

import java.io.IOException;

/**

 * Example utility that works like the df(1M) program to print out disk space

 * information

 */

public class DiskUsage {

    static final long K = 1024;

    static void printFileStore(FileStore store) throws IOException {

        long total = store.getTotalSpace() / K;

        long used = (store.getTotalSpace() - store.getUnallocatedSpace()) / K;

        long avail = store.getUsableSpace() / K;

        String s = store.toString();

        if (s.length() > 20) {

            System.out.println(s);

            s = "";

        }

        System.out.format("%-20s %12d %12d %12d\n", s, total, used, avail);

    }

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

        System.out.format("%-20s %12s %12s %12s\n", "Filesystem", "kbytes", "used", "avail");

        if (args.length == 0) {

            FileSystem fs = FileSystems.getDefault();

            for (FileStore store: fs.getFileStores()) {

                printFileStore(store);

            }

        } else {

            for (String file: args) {

                FileStore store = Files.getFileStore(Paths.get(file));

                printFileStore(store);

            }

        }

    }

}