1 /*
2 * This file is part of *** M y C o R e ***
3 * See http://www.mycore.de/ for details.
4 *
5 * MyCoRe is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
9 *
10 * MyCoRe is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with MyCoRe. If not, see <http://www.gnu.org/licenses/>.
17 */
18
19 package org.mycore.datamodel.niofs;
20
21 import java.io.FileNotFoundException;
22 import java.io.IOException;
23 import java.nio.file.FileSystem;
24 import java.nio.file.FileVisitResult;
25 import java.nio.file.Files;
26 import java.nio.file.LinkOption;
27 import java.nio.file.NoSuchFileException;
28 import java.nio.file.Path;
29 import java.nio.file.SimpleFileVisitor;
30 import java.nio.file.attribute.BasicFileAttributes;
31 import java.util.Arrays;
32 import java.util.concurrent.atomic.AtomicLong;
33
34 import org.apache.logging.log4j.LogManager;
35
36 /**
37 * @author Thomas Scheffler (yagee)
38 *
39 */
40 public abstract class MCRPathUtils {
41
42 private MCRPathUtils() {
43
44 }
45
46 /**
47 * Returns requested {@link BasicFileAttributes} or null if file does not exist.
48 *
49 * Same as {@link Files#readAttributes(Path, Class, LinkOption...)} without throwing {@link IOException}.
50 *
51 * @param path
52 * the path to the file
53 * @param type
54 * the {@code Class} of the file attributes required
55 * to read
56 * @param options
57 * options indicating how symbolic links are handled
58 *
59 * @return the file attributes
60 */
61 public static <A extends BasicFileAttributes> A getAttributes(Path path, Class<A> type, LinkOption... options) {
62 try {
63 return Files.readAttributes(path, type, options);
64 } catch (NoSuchFileException | FileNotFoundException e) {
65 //we expect that file may not exist
66 } catch (IOException e) {
67 //any other IOException is catched
68 LogManager.getLogger(MCRPathUtils.class).info("Error while retrieving attributes of file: {}", path, e);
69 }
70 return null;
71 }
72
73 public static Path getPath(FileSystem targetFS, String fileName) {
74 String[] nameComps = fileName.replace('\\', '/').split("/");
75 if (nameComps.length == 1) {
76 return targetFS.getPath(nameComps[0]);
77 } else {
78 return targetFS.getPath(nameComps[0], Arrays.copyOfRange(nameComps, 1, nameComps.length));
79 }
80
81 }
82
83 /**
84 * Returns the size of the path.
85 *
86 * If the path is a directory the size returned is the sum of all files found recursivly
87 * in this directory.
88 * @param p path of a file or directory
89 * @return the size of p in bytes
90 * @throws IOException underlaying IOException
91 */
92 public static long getSize(Path p) throws IOException {
93 AtomicLong size = new AtomicLong();
94 Files.walkFileTree(p, new SimpleFileVisitor<Path>() {
95 @Override
96 public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
97 size.addAndGet(attrs.size());
98 return super.visitFile(file, attrs);
99 }
100 });
101 return size.get();
102 }
103
104 }