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- /*
- * Copyright (C) 2011, 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.internal.storage.dfs;
-
- import java.io.IOException;
-
- import org.eclipse.jgit.lib.ObjectIdRef;
- import org.eclipse.jgit.lib.Ref;
- import org.eclipse.jgit.lib.Ref.Storage;
- import org.eclipse.jgit.lib.RefUpdate;
- import org.eclipse.jgit.lib.SymbolicRef;
- import org.eclipse.jgit.revwalk.RevObject;
- import org.eclipse.jgit.revwalk.RevTag;
- import org.eclipse.jgit.revwalk.RevWalk;
-
- final class DfsRefUpdate extends RefUpdate {
- private final DfsRefDatabase refdb;
-
- private Ref dstRef;
-
- private RevWalk rw;
-
- DfsRefUpdate(DfsRefDatabase refdb, Ref ref) {
- super(ref);
- this.refdb = refdb;
- }
-
- @Override
- protected DfsRefDatabase getRefDatabase() {
- return refdb;
- }
-
- @Override
- protected DfsRepository getRepository() {
- return refdb.getRepository();
- }
-
- @Override
- protected boolean tryLock(boolean deref) throws IOException {
- dstRef = getRef();
- if (deref)
- dstRef = dstRef.getLeaf();
-
- if (dstRef.isSymbolic())
- setOldObjectId(null);
- else
- setOldObjectId(dstRef.getObjectId());
-
- return true;
- }
-
- @Override
- protected void unlock() {
- // No state is held while "locked".
- }
-
- @Override
- public Result update(RevWalk walk) throws IOException {
- try {
- rw = walk;
- return super.update(walk);
- } finally {
- rw = null;
- }
- }
-
- @Override
- protected Result doUpdate(Result desiredResult) throws IOException {
- ObjectIdRef newRef;
- RevObject obj = rw.parseAny(getNewObjectId());
- if (obj instanceof RevTag) {
- newRef = new ObjectIdRef.PeeledTag(
- Storage.PACKED,
- dstRef.getName(),
- getNewObjectId(),
- rw.peel(obj).copy());
- } else {
- newRef = new ObjectIdRef.PeeledNonTag(
- Storage.PACKED,
- dstRef.getName(),
- getNewObjectId());
- }
-
- if (getRefDatabase().compareAndPut(dstRef, newRef)) {
- getRefDatabase().stored(newRef);
- return desiredResult;
- }
- return Result.LOCK_FAILURE;
- }
-
- @Override
- protected Result doDelete(Result desiredResult) throws IOException {
- if (getRefDatabase().compareAndRemove(dstRef)) {
- getRefDatabase().removed(dstRef.getName());
- return desiredResult;
- }
- return Result.LOCK_FAILURE;
- }
-
- @Override
- protected Result doLink(String target) throws IOException {
- final SymbolicRef newRef = new SymbolicRef(
- dstRef.getName(),
- new ObjectIdRef.Unpeeled(
- Storage.NEW,
- target,
- null));
- if (getRefDatabase().compareAndPut(dstRef, newRef)) {
- getRefDatabase().stored(newRef);
- if (dstRef.getStorage() == Ref.Storage.NEW)
- return Result.NEW;
- return Result.FORCED;
- }
- return Result.LOCK_FAILURE;
- }
- }
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