1/*
2 * Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 *   - Redistributions of source code must retain the above copyright
9 *     notice, this list of conditions and the following disclaimer.
10 *
11 *   - Redistributions in binary form must reproduce the above copyright
12 *     notice, this list of conditions and the following disclaimer in the
13 *     documentation and/or other materials provided with the distribution.
14 *
15 *   - Neither the name of Oracle nor the names of its
16 *     contributors may be used to endorse or promote products derived
17 *     from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
20 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
26 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
27 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
29 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32/*
33 * This source code is provided to illustrate the usage of a given feature
34 * or technique and has been deliberately simplified. Additional steps
35 * required for a production-quality application, such as security checks,
36 * input validation and proper error handling, might not be present in
37 * this sample code.
38 */
39
40
41import java.nio.file.*;
42import java.nio.file.attribute.*;
43import java.io.IOException;
44
45/**
46 * Example utility that works like the df(1M) program to print out disk space
47 * information
48 */
49
50public class DiskUsage {
51
52    static final long K = 1024;
53
54    static void printFileStore(FileStore store) throws IOException {
55        long total = store.getTotalSpace() / K;
56        long used = (store.getTotalSpace() - store.getUnallocatedSpace()) / K;
57        long avail = store.getUsableSpace() / K;
58
59        String s = store.toString();
60        if (s.length() > 20) {
61            System.out.println(s);
62            s = "";
63        }
64        System.out.format("%-20s %12d %12d %12d\n", s, total, used, avail);
65    }
66
67    public static void main(String[] args) throws IOException {
68        System.out.format("%-20s %12s %12s %12s\n", "Filesystem", "kbytes", "used", "avail");
69        if (args.length == 0) {
70            FileSystem fs = FileSystems.getDefault();
71            for (FileStore store: fs.getFileStores()) {
72                printFileStore(store);
73            }
74        } else {
75            for (String file: args) {
76                FileStore store = Files.getFileStore(Paths.get(file));
77                printFileStore(store);
78            }
79        }
80    }
81}
82