/*
* Copyright (C) 2010, Google Inc.
* and other copyright owners as documented in the project's IP log.
*
* This program and the accompanying materials are made available
* under the terms of the Eclipse Distribution License v1.0 which
* accompanies this distribution, is reproduced below, and is
* available at http://www.eclipse.org/org/documents/edl-v10.php
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* - Neither the name of the Eclipse Foundation, Inc. nor the
* names of its contributors may be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.eclipse.jgit.storage.file;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.zip.DataFormatException;
import java.util.zip.DeflaterOutputStream;
import java.util.zip.InflaterInputStream;
import org.eclipse.jgit.errors.IncorrectObjectTypeException;
import org.eclipse.jgit.errors.LargeObjectException;
import org.eclipse.jgit.errors.MissingObjectException;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ObjectLoader;
import org.eclipse.jgit.lib.ObjectStream;
import org.eclipse.jgit.storage.pack.BinaryDelta;
import org.eclipse.jgit.storage.pack.DeltaStream;
import org.eclipse.jgit.util.io.TeeInputStream;
class LargePackedDeltaObject extends ObjectLoader {
private static final long SIZE_UNKNOWN = -1;
private int type;
private long size;
private final long objectOffset;
private final long baseOffset;
private final int headerLength;
private final PackFile pack;
private final FileObjectDatabase db;
LargePackedDeltaObject(long objectOffset,
long baseOffset, int headerLength, PackFile pack,
FileObjectDatabase db) {
this.type = Constants.OBJ_BAD;
this.size = SIZE_UNKNOWN;
this.objectOffset = objectOffset;
this.baseOffset = baseOffset;
this.headerLength = headerLength;
this.pack = pack;
this.db = db;
}
@Override
public int getType() {
if (type == Constants.OBJ_BAD) {
WindowCursor wc = new WindowCursor(db);
try {
type = pack.getObjectType(wc, objectOffset);
} catch (IOException packGone) {
// If the pack file cannot be pinned into the cursor, it
// probably was repacked recently. Go find the object
// again and get the type from that location instead.
//
try {
type = wc.open(getObjectId()).getType();
} catch (IOException packGone2) {
// "He's dead, Jim." We just can't discover the type
// and the interface isn't supposed to be lazy here.
// Report an invalid type code instead, callers will
// wind up bailing out with an error at some point.
}
} finally {
wc.release();
}
}
return type;
}
@Override
public long getSize() {
if (size == SIZE_UNKNOWN) {
WindowCursor wc = new WindowCursor(db);
try {
byte[] b = pack.getDeltaHeader(wc, objectOffset + headerLength);
size = BinaryDelta.getResultSize(b);
} catch (DataFormatException objectCorrupt) {
// The zlib stream for the delta is corrupt. We probably
// cannot access the object. Keep the size negative and
// report that bogus result to the caller.
} catch (IOException packGone) {
// If the pack file cannot be pinned into the cursor, it
// probably was repacked recently. Go find the object
// again and get the size from that location instead.
//
try {
size = wc.open(getObjectId()).getSize();
} catch (IOException packGone2) {
// "He's dead, Jim." We just can't discover the size
// and the interface isn't supposed to be lazy here.
// Report an invalid type code instead, callers will
// wind up bailing out with an error at some point.
}
} finally {
wc.release();
}
}
return size;
}
@Override
public boolean isLarge() {
return true;
}
@Override
public byte[] getCachedBytes() throws LargeObjectException {
try {
throw new LargeObjectException(getObjectId());
} catch (IOException cannotObtainId) {
LargeObjectException err = new LargeObjectException();
err.initCause(cannotObtainId);
throw err;
}
}
@Override
public ObjectStream openStream() throws MissingObjectException, IOException {
// If the object was recently unpacked, its available loose.
// The loose format is going to be faster to access than a
// delta applied on top of a base. Use that whenever we can.
//
final ObjectId myId = getObjectId();
final WindowCursor wc = new WindowCursor(db);
ObjectLoader ldr = db.openObject2(wc, myId.name(), myId);
if (ldr != null)
return ldr.openStream();
InputStream in = open(wc);
in = new BufferedInputStream(in, 8192);
// While we inflate the object, also deflate it back as a loose
// object. This will later be cleaned up by a gc pass, but until
// then we will reuse the loose form by the above code path.
//
int myType = getType();
long mySize = getSize();
final ObjectDirectoryInserter odi = db.newInserter();
final File tmp = odi.newTempFile();
DeflaterOutputStream dOut = odi.compress(new FileOutputStream(tmp));
odi.writeHeader(dOut, myType, mySize);
in = new TeeInputStream(in, dOut);
return new ObjectStream.Filter(myType, mySize, in) {
@Override
public void close() throws IOException {
super.close();
odi.release();
wc.release();
db.insertUnpackedObject(tmp, myId, true /* force creation */);
}
};
}
private InputStream open(final WindowCursor wc)
throws MissingObjectException, IOException,
IncorrectObjectTypeException {
InputStream delta;
try {
delta = new PackInputStream(pack, objectOffset + headerLength, wc);
} catch (IOException packGone) {
// If the pack file cannot be pinned into the cursor, it
// probably was repacked recently. Go find the object
// again and open the stream from that location instead.
//
return wc.open(getObjectId()).openStream();
}
delta = new InflaterInputStream(delta);
final ObjectLoader base = pack.load(wc, baseOffset);
DeltaStream ds = new DeltaStream(delta) {
private long baseSize = SIZE_UNKNOWN;
@Override
protected InputStream openBase() throws IOException {
InputStream in;
if (base instanceof LargePackedDeltaObject)
in = ((LargePackedDeltaObject) base).open(wc);
else
in = base.openStream();
if (baseSize == SIZE_UNKNOWN) {
if (in instanceof DeltaStream)
baseSize = ((DeltaStream) in).getSize();
else if (in instanceof ObjectStream)
baseSize = ((ObjectStream) in).getSize();
}
return in;
}
@Override
protected long getBaseSize() throws IOException {
if (baseSize == SIZE_UNKNOWN) {
// This code path should never be used as DeltaStream
// is supposed to open the stream first, which would
// initialize the size for us directly from the stream.
baseSize = base.getSize();
}
return baseSize;
}
};
if (type == Constants.OBJ_BAD) {
if (!(base instanceof LargePackedDeltaObject))
type = base.getType();
}
if (size == SIZE_UNKNOWN)
size = ds.getSize();
return ds;
}
private ObjectId getObjectId() throws IOException {
return pack.findObjectForOffset(objectOffset);
}
}