2 * Copyright (C) 2007, Robin Rosenberg <robin.rosenberg@dewire.com>
3 * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
7 * Redistribution and use in source and binary forms, with or
8 * without modification, are permitted provided that the following
11 * - Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
14 * - Redistributions in binary form must reproduce the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer in the documentation and/or other materials provided
17 * with the distribution.
19 * - Neither the name of the Git Development Community nor the
20 * names of its contributors may be used to endorse or promote
21 * products derived from this software without specific prior
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
25 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
26 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
29 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
32 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
33 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
34 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
36 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 package org
.spearce
.jgit
.lib
;
41 import java
.io
.IOException
;
42 import java
.util
.zip
.DataFormatException
;
44 import org
.spearce
.jgit
.errors
.CorruptObjectException
;
46 /** Reader for a deltified object stored in a pack file. */
47 abstract class DeltaPackedObjectLoader
extends PackedObjectLoader
{
48 private static final int OBJ_COMMIT
= Constants
.OBJ_COMMIT
;
50 private final int deltaSize
;
52 DeltaPackedObjectLoader(final WindowCursor curs
, final PackFile pr
,
53 final long offset
, final int deltaSz
) {
54 super(curs
, pr
, offset
);
59 public int getType() throws IOException
{
65 public long getSize() throws IOException
{
72 public byte[] getCachedBytes() throws IOException
{
73 if (objectType
!= OBJ_COMMIT
) {
74 final UnpackedObjectCache
.Entry cache
= pack
.readCache(dataOffset
);
77 objectType
= cache
.type
;
78 objectSize
= cache
.data
.length
;
84 final PackedObjectLoader baseLoader
= getBaseLoader();
85 final byte[] data
= BinaryDelta
.apply(baseLoader
.getCachedBytes(),
86 pack
.decompress(dataOffset
, deltaSize
, curs
));
88 objectType
= baseLoader
.getType();
89 objectSize
= data
.length
;
90 if (objectType
!= OBJ_COMMIT
)
91 pack
.saveCache(dataOffset
, data
, objectType
);
93 } catch (DataFormatException dfe
) {
94 final CorruptObjectException coe
;
95 coe
= new CorruptObjectException(getId(), "bad stream");
102 * @return the object loader for the base object
103 * @throws IOException
105 protected abstract PackedObjectLoader
getBaseLoader() throws IOException
;