1 /*
2 * Copyright (C) 2017, Markus Duft <markus.duft@ssi-schaefer.com>
3 * and other copyright owners as documented in the project's IP log.
4 *
5 * This program and the accompanying materials are made available
6 * under the terms of the Eclipse Distribution License v1.0 which
7 * accompanies this distribution, is reproduced below, and is
8 * available at http://www.eclipse.org/org/documents/edl-v10.php
9 *
10 * All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials provided
22 * with the distribution.
23 *
24 * - Neither the name of the Eclipse Foundation, Inc. nor the
25 * names of its contributors may be used to endorse or promote
26 * products derived from this software without specific prior
27 * written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
30 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
31 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
32 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
33 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
34 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
35 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
36 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
37 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
38 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
40 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
41 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
42 */
43 package org.eclipse.jgit.lfs;
44
45 import java.io.IOException;
46 import java.nio.file.Files;
47 import java.nio.file.Path;
48 import java.nio.file.attribute.BasicFileAttributes;
49
50 import org.eclipse.jgit.errors.LargeObjectException;
51 import org.eclipse.jgit.errors.MissingObjectException;
52 import org.eclipse.jgit.lib.Constants;
53 import org.eclipse.jgit.lib.ObjectLoader;
54 import org.eclipse.jgit.lib.ObjectStream;
55 import org.eclipse.jgit.storage.pack.PackConfig;
56 import org.eclipse.jgit.util.IO;
57
58 /**
59 * An {@link ObjectLoader} implementation that reads a media file from the LFS
60 * storage.
61 *
62 * @since 4.11
63 */
64 public class LfsBlobLoader extends ObjectLoader {
65
66 private Path mediaFile;
67
68 private BasicFileAttributes attributes;
69
70 private byte[] cached;
71
72 /**
73 * Create a loader for the LFS media file at the given path.
74 *
75 * @param mediaFile
76 * path to the file
77 * @throws IOException
78 * in case of an error reading attributes
79 */
80 public LfsBlobLoader(Path mediaFile) throws IOException {
81 this.mediaFile = mediaFile;
82 this.attributes = Files.readAttributes(mediaFile,
83 BasicFileAttributes.class);
84 }
85
86 @Override
87 public int getType() {
88 return Constants.OBJ_BLOB;
89 }
90
91 @Override
92 public long getSize() {
93 return attributes.size();
94 }
95
96 @Override
97 public byte[] getCachedBytes() throws LargeObjectException {
98 if (getSize() > PackConfig.DEFAULT_BIG_FILE_THRESHOLD) {
99 throw new LargeObjectException();
100 }
101
102 if (cached == null) {
103 try {
104 cached = IO.readFully(mediaFile.toFile());
105 } catch (IOException ioe) {
106 throw new LargeObjectException(ioe);
107 }
108 }
109 return cached;
110 }
111
112 @Override
113 public ObjectStream openStream()
114 throws MissingObjectException, IOException {
115 return new ObjectStream.Filter(getType(), getSize(),
116 Files.newInputStream(mediaFile));
117 }
118
119 }