/*
* Copyright (C) 2009-2010, Google Inc.
* Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
* 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 static org.eclipse.jgit.lib.Constants.encode;
import java.io.IOException;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.RefUpdate;
import org.eclipse.jgit.lib.Repository;
/** Updates any reference stored by {@link RefDirectory}. */
class RefDirectoryUpdate extends RefUpdate {
private final RefDirectory database;
private LockFile lock;
RefDirectoryUpdate(final RefDirectory r, final Ref ref) {
super(ref);
database = r;
}
@Override
protected RefDirectory getRefDatabase() {
return database;
}
@Override
protected Repository getRepository() {
return database.getRepository();
}
@Override
protected boolean tryLock(boolean deref) throws IOException {
Ref dst = getRef();
if (deref)
dst = dst.getLeaf();
String name = dst.getName();
lock = new LockFile(database.fileFor(name), getRepository().getFS());
if (lock.lock()) {
dst = database.getRef(name);
setOldObjectId(dst != null ? dst.getObjectId() : null);
return true;
} else {
return false;
}
}
@Override
protected void unlock() {
if (lock != null) {
lock.unlock();
lock = null;
}
}
@Override
protected Result doUpdate(final Result status) throws IOException {
WriteConfig wc = database.getRepository().getConfig()
.get(WriteConfig.KEY);
lock.setFSync(wc.getFSyncRefFiles());
lock.setNeedStatInformation(true);
lock.write(getNewObjectId());
String msg = getRefLogMessage();
if (msg != null) {
if (isRefLogIncludingResult()) {
String strResult = toResultString(status);
if (strResult != null) {
if (msg.length() > 0)
msg = msg + ": " + strResult;
else
msg = strResult;
}
}
database.log(this, msg, true);
}
if (!lock.commit())
return Result.LOCK_FAILURE;
database.stored(this, lock.getCommitSnapshot());
return status;
}
private String toResultString(final Result status) {
switch (status) {
case FORCED:
return "forced-update";
case FAST_FORWARD:
return "fast forward";
case NEW:
return "created";
default:
return null;
}
}
@Override
protected Result doDelete(final Result status) throws IOException {
if (getRef().getLeaf().getStorage() != Ref.Storage.NEW)
database.delete(this);
return status;
}
@Override
protected Result doLink(final String target) throws IOException {
WriteConfig wc = database.getRepository().getConfig()
.get(WriteConfig.KEY);
lock.setFSync(wc.getFSyncRefFiles());
lock.setNeedStatInformation(true);
lock.write(encode(RefDirectory.SYMREF + target + '\n'));
String msg = getRefLogMessage();
if (msg != null)
database.log(this, msg, false);
if (!lock.commit())
return Result.LOCK_FAILURE;
database.storedSymbolicRef(this, lock.getCommitSnapshot(), target);
if (getRef().getStorage() == Ref.Storage.NEW)
return Result.NEW;
return Result.FORCED;
}
}