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- /*
- * Copyright (C) 2012, GitHub 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.api;
-
- import static org.eclipse.jgit.lib.Constants.R_STASH;
-
- import java.io.File;
- import java.io.IOException;
- import java.text.MessageFormat;
- import java.util.List;
-
- import org.eclipse.jgit.api.errors.GitAPIException;
- import org.eclipse.jgit.api.errors.InvalidRefNameException;
- import org.eclipse.jgit.api.errors.JGitInternalException;
- import org.eclipse.jgit.errors.LockFailedException;
- import org.eclipse.jgit.internal.JGitText;
- import org.eclipse.jgit.lib.ObjectId;
- import org.eclipse.jgit.lib.Ref;
- import org.eclipse.jgit.lib.RefUpdate;
- import org.eclipse.jgit.lib.RefUpdate.Result;
- import org.eclipse.jgit.lib.Repository;
- import org.eclipse.jgit.storage.file.ReflogEntry;
- import org.eclipse.jgit.storage.file.ReflogReader;
- import org.eclipse.jgit.storage.file.ReflogWriter;
- import org.eclipse.jgit.util.FileUtils;
-
- /**
- * Command class to delete a stashed commit reference
- *
- * @see <a href="http://www.kernel.org/pub/software/scm/git/docs/git-stash.html"
- * >Git documentation about Stash</a>
- */
- public class StashDropCommand extends GitCommand<ObjectId> {
-
- private int stashRefEntry;
-
- private boolean all;
-
- /**
- * @param repo
- */
- public StashDropCommand(Repository repo) {
- super(repo);
- }
-
- /**
- * Set the stash reference to drop (0-based).
- * <p>
- * This will default to drop the latest stashed commit (stash@{0}) if
- * unspecified
- *
- * @param stashRef
- * @return {@code this}
- */
- public StashDropCommand setStashRef(final int stashRef) {
- if (stashRef < 0)
- throw new IllegalArgumentException();
-
- stashRefEntry = stashRef;
- return this;
- }
-
- /**
- * Set wheter drop all stashed commits
- *
- * @param all
- * true to drop all stashed commits, false to drop only the
- * stashed commit set via calling {@link #setStashRef(int)}
- * @return {@code this}
- */
- public StashDropCommand setAll(final boolean all) {
- this.all = all;
- return this;
- }
-
- private Ref getRef() throws GitAPIException {
- try {
- return repo.getRef(R_STASH);
- } catch (IOException e) {
- throw new InvalidRefNameException(MessageFormat.format(
- JGitText.get().cannotRead, R_STASH), e);
- }
- }
-
- private RefUpdate createRefUpdate(final Ref stashRef) throws IOException {
- RefUpdate update = repo.updateRef(R_STASH);
- update.disableRefLog();
- update.setExpectedOldObjectId(stashRef.getObjectId());
- update.setForceUpdate(true);
- return update;
- }
-
- private void deleteRef(final Ref stashRef) {
- try {
- Result result = createRefUpdate(stashRef).delete();
- if (Result.FORCED != result)
- throw new JGitInternalException(MessageFormat.format(
- JGitText.get().stashDropDeleteRefFailed, result));
- } catch (IOException e) {
- throw new JGitInternalException(JGitText.get().stashDropFailed, e);
- }
- }
-
- private void updateRef(Ref stashRef, ObjectId newId) {
- try {
- RefUpdate update = createRefUpdate(stashRef);
- update.setNewObjectId(newId);
- Result result = update.update();
- switch (result) {
- case FORCED:
- case NEW:
- case NO_CHANGE:
- return;
- default:
- throw new JGitInternalException(MessageFormat.format(
- JGitText.get().updatingRefFailed, R_STASH, newId,
- result));
- }
- } catch (IOException e) {
- throw new JGitInternalException(JGitText.get().stashDropFailed, e);
- }
- }
-
- /**
- * Drop the configured entry from the stash reflog and return value of the
- * stash reference after the drop occurs
- *
- * @return commit id of stash reference or null if no more stashed changes
- */
- public ObjectId call() throws GitAPIException, JGitInternalException {
- checkCallable();
-
- Ref stashRef = getRef();
- if (stashRef == null)
- return null;
-
- if (all) {
- deleteRef(stashRef);
- return null;
- }
-
- ReflogReader reader = new ReflogReader(repo, R_STASH);
- List<ReflogEntry> entries;
- try {
- entries = reader.getReverseEntries();
- } catch (IOException e) {
- throw new JGitInternalException(JGitText.get().stashDropFailed, e);
- }
-
- if (stashRefEntry >= entries.size())
- throw new JGitInternalException(
- JGitText.get().stashDropMissingReflog);
-
- if (entries.size() == 1) {
- deleteRef(stashRef);
- return null;
- }
-
- ReflogWriter writer = new ReflogWriter(repo, true);
- String stashLockRef = ReflogWriter.refLockFor(R_STASH);
- File stashLockFile = writer.logFor(stashLockRef);
- File stashFile = writer.logFor(R_STASH);
- if (stashLockFile.exists())
- throw new JGitInternalException(JGitText.get().stashDropFailed,
- new LockFailedException(stashFile));
-
- entries.remove(stashRefEntry);
- ObjectId entryId = ObjectId.zeroId();
- try {
- for (int i = entries.size() - 1; i >= 0; i--) {
- ReflogEntry entry = entries.get(i);
- writer.log(stashLockRef, entryId, entry.getNewId(),
- entry.getWho(), entry.getComment());
- entryId = entry.getNewId();
- }
- if (!stashLockFile.renameTo(stashFile)) {
- FileUtils.delete(stashFile);
- if (!stashLockFile.renameTo(stashFile))
- throw new JGitInternalException(MessageFormat.format(
- JGitText.get().couldNotWriteFile,
- stashLockFile.getPath(), stashFile.getPath()));
- }
- } catch (IOException e) {
- throw new JGitInternalException(JGitText.get().stashDropFailed, e);
- }
- updateRef(stashRef, entryId);
-
- try {
- Ref newStashRef = repo.getRef(R_STASH);
- return newStashRef != null ? newStashRef.getObjectId() : null;
- } catch (IOException e) {
- throw new InvalidRefNameException(MessageFormat.format(
- JGitText.get().cannotRead, R_STASH), e);
- }
- }
- }
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