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.dfs;
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 final 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 DfsPackFile pack;
67
68 private final DfsObjDatabase db;
69
70 LargePackedWholeObject(int type, long size, long objectOffset,
71 int headerLength, DfsPackFile pack, DfsObjDatabase 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 throw new LargeObjectException();
98 }
99
100 @Override
101 public ObjectStream openStream() throws MissingObjectException, IOException {
102 DfsReader ctx = db.newReader();
103 InputStream in;
104 try {
105 in = new PackInputStream(pack, objectOffset + headerLength, ctx);
106 } catch (IOException packGone) {
107 // If the pack file cannot be pinned into the cursor, it
108 // probably was repacked recently. Go find the object
109 // again and open the stream from that location instead.
110 //
111 try {
112 ObjectId obj = pack.getReverseIdx(ctx).findObject(objectOffset);
113 return ctx.open(obj, type).openStream();
114 } finally {
115 ctx.close();
116 }
117 } finally {
118 ctx.close();
119 }
120
121 // Align buffer to inflater size, at a larger than default block.
122 // This reduces the number of context switches from the
123 // caller down into the pack stream inflation.
124 int bufsz = 8192;
125 in = new BufferedInputStream(
126 new InflaterInputStream(in, ctx.inflater(), bufsz),
127 bufsz);
128 return new ObjectStream.Filter(type, size, in);
129 }
130 }