1 /*
2 * Copyright (C) 2010, Google Inc.
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
44 package org.eclipse.jgit.internal.storage.file;
45
46 import java.io.BufferedInputStream;
47 import java.io.IOException;
48 import java.io.InputStream;
49 import java.util.zip.InflaterInputStream;
50
51 import org.eclipse.jgit.errors.LargeObjectException;
52 import org.eclipse.jgit.errors.MissingObjectException;
53 import org.eclipse.jgit.lib.ObjectId;
54 import org.eclipse.jgit.lib.ObjectLoader;
55 import org.eclipse.jgit.lib.ObjectStream;
56
57 class LargePackedWholeObject extends ObjectLoader {
58 private final int type;
59
60 private final long size;
61
62 private final long objectOffset;
63
64 private final int headerLength;
65
66 private final PackFile pack;
67
68 private final FileObjectDatabase db;
69
70 LargePackedWholeObject(int type, long size, long objectOffset,
71 int headerLength, PackFile pack, FileObjectDatabase db) {
72 this.type = type;
73 this.size = size;
74 this.objectOffset = objectOffset;
75 this.headerLength = headerLength;
76 this.pack = pack;
77 this.db = db;
78 }
79
80 @Override
81 public int getType() {
82 return type;
83 }
84
85 @Override
86 public long getSize() {
87 return size;
88 }
89
90 @Override
91 public boolean isLarge() {
92 return true;
93 }
94
95 @Override
96 public byte[] getCachedBytes() throws LargeObjectException {
97 try {
98 throw new LargeObjectException(getObjectId());
99 } catch (IOException cannotObtainId) {
100 LargeObjectException err = new LargeObjectException();
101 err.initCause(cannotObtainId);
102 throw err;
103 }
104 }
105
106 @Override
107 public ObjectStream openStream() throws MissingObjectException, IOException {
108 WindowCursor wc = new WindowCursor(db);
109 InputStream in;
110 try {
111 in = new PackInputStream(pack, objectOffset + headerLength, wc);
112 } catch (IOException packGone) {
113 // If the pack file cannot be pinned into the cursor, it
114 // probably was repacked recently. Go find the object
115 // again and open the stream from that location instead.
116 //
117 return wc.open(getObjectId(), type).openStream();
118 }
119
120 in = new BufferedInputStream( //
121 new InflaterInputStream( //
122 in, //
123 wc.inflater(), //
124 8192), //
125 8192);
126 return new ObjectStream.Filter(type, size, in);
127 }
128
129 private ObjectId getObjectId() throws IOException {
130 return pack.findObjectForOffset(objectOffset);
131 }
132 }