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.IOException;
47
48 import org.eclipse.jgit.internal.storage.pack.StoredObjectRepresentation;
49 import org.eclipse.jgit.lib.ObjectId;
50
51 class LocalObjectRepresentation extends StoredObjectRepresentation {
52 static LocalObjectRepresentation newWhole(PackFile f, long p, long length) {
53 LocalObjectRepresentation r = new LocalObjectRepresentation() {
54 @Override
55 public int getFormat() {
56 return PACK_WHOLE;
57 }
58 };
59 r.pack = f;
60 r.offset = p;
61 r.length = length;
62 return r;
63 }
64
65 static LocalObjectRepresentation newDelta(PackFile f, long p, long n,
66 ObjectId base) {
67 LocalObjectRepresentation r = new Delta();
68 r.pack = f;
69 r.offset = p;
70 r.length = n;
71 r.baseId = base;
72 return r;
73 }
74
75 static LocalObjectRepresentation newDelta(PackFile f, long p, long n,
76 long base) {
77 LocalObjectRepresentation r = new Delta();
78 r.pack = f;
79 r.offset = p;
80 r.length = n;
81 r.baseOffset = base;
82 return r;
83 }
84
85 PackFile pack;
86
87 long offset;
88
89 long length;
90
91 private long baseOffset;
92
93 private ObjectId baseId;
94
95 /** {@inheritDoc} */
96 @Override
97 public int getWeight() {
98 return (int) Math.min(length, Integer.MAX_VALUE);
99 }
100
101 /** {@inheritDoc} */
102 @Override
103 public ObjectId getDeltaBase() {
104 if (baseId == null && getFormat() == PACK_DELTA) {
105 try {
106 baseId = pack.findObjectForOffset(baseOffset);
107 } catch (IOException error) {
108 return null;
109 }
110 }
111 return baseId;
112 }
113
114 private static final class Delta extends LocalObjectRepresentation {
115 @Override
116 public int getFormat() {
117 return PACK_DELTA;
118 }
119 }
120 }