public RevCommit call()

in org.eclipse.jgit/src/org/eclipse/jgit/api/RevertCommand.java [96:208]
99 lines of code
12 McCabe index (conditional complexity)

	public RevCommit call() throws NoMessageException, UnmergedPathsException,
			ConcurrentRefUpdateException, WrongRepositoryStateException,
			GitAPIException {
		RevCommit newHead = null;
		checkCallable();

		try (RevWalk revWalk = new RevWalk(repo)) {

			// get the head commit
			Ref headRef = repo.exactRef(Constants.HEAD);
			if (headRef == null)
				throw new NoHeadException(
						JGitText.get().commitOnRepoWithoutHEADCurrentlyNotSupported);
			RevCommit headCommit = revWalk.parseCommit(headRef.getObjectId());

			newHead = headCommit;

			// loop through all refs to be reverted
			for (Ref src : commits) {
				// get the commit to be reverted
				// handle annotated tags
				ObjectId srcObjectId = src.getPeeledObjectId();
				if (srcObjectId == null)
					srcObjectId = src.getObjectId();
				RevCommit srcCommit = revWalk.parseCommit(srcObjectId);

				// get the parent of the commit to revert
				if (srcCommit.getParentCount() != 1)
					throw new MultipleParentsNotAllowedException(
							MessageFormat.format(
									JGitText.get().canOnlyRevertCommitsWithOneParent,
									srcCommit.name(),
									Integer.valueOf(srcCommit.getParentCount())));

				RevCommit srcParent = srcCommit.getParent(0);
				revWalk.parseHeaders(srcParent);

				String ourName = calculateOurName(headRef);
				String revertName = srcCommit.getId()
						.abbreviate(OBJECT_ID_ABBREV_STRING_LENGTH).name() + " " //$NON-NLS-1$
						+ srcCommit.getShortMessage();

				ResolveMerger merger = (ResolveMerger) strategy.newMerger(repo);
				merger.setWorkingTreeIterator(new FileTreeIterator(repo));
				merger.setBase(srcCommit.getTree());
				merger.setCommitNames(new String[] {
						"BASE", ourName, revertName }); //$NON-NLS-1$

				String shortMessage = "Revert \"" + srcCommit.getShortMessage() //$NON-NLS-1$
						+ "\""; //$NON-NLS-1$
				String newMessage = shortMessage + "\n\n" //$NON-NLS-1$
						+ "This reverts commit " + srcCommit.getId().getName() //$NON-NLS-1$
						+ ".\n"; //$NON-NLS-1$
				if (merger.merge(headCommit, srcParent)) {
					if (!merger.getModifiedFiles().isEmpty()) {
						repo.fireEvent(new WorkingTreeModifiedEvent(
								merger.getModifiedFiles(), null));
					}
					if (AnyObjectId.isEqual(headCommit.getTree().getId(),
							merger.getResultTreeId()))
						continue;
					DirCacheCheckout dco = new DirCacheCheckout(repo,
							headCommit.getTree(), repo.lockDirCache(),
							merger.getResultTreeId());
					dco.setFailOnConflict(true);
					dco.setProgressMonitor(monitor);
					dco.checkout();
					try (Git git = new Git(getRepository())) {
						newHead = git.commit().setMessage(newMessage)
								.setReflogComment("revert: " + shortMessage) //$NON-NLS-1$
								.call();
					}
					revertedRefs.add(src);
					headCommit = newHead;
				} else {
					unmergedPaths = merger.getUnmergedPaths();
					Map<String, MergeFailureReason> failingPaths = merger
							.getFailingPaths();
					if (failingPaths != null)
						failingResult = new MergeResult(null,
								merger.getBaseCommitId(),
								new ObjectId[] { headCommit.getId(),
										srcParent.getId() },
								MergeStatus.FAILED, strategy,
								merger.getMergeResults(), failingPaths, null);
					else
						failingResult = new MergeResult(null,
								merger.getBaseCommitId(),
								new ObjectId[] { headCommit.getId(),
										srcParent.getId() },
								MergeStatus.CONFLICTING, strategy,
								merger.getMergeResults(), failingPaths, null);
					if (!merger.failed() && !unmergedPaths.isEmpty()) {
						CommitConfig config = repo.getConfig()
								.get(CommitConfig.KEY);
						char commentChar = config.getCommentChar(newMessage);
						String message = new MergeMessageFormatter()
								.formatWithConflicts(newMessage,
										merger.getUnmergedPaths(), commentChar);
						repo.writeRevertHead(srcCommit.getId());
						repo.writeMergeCommitMsg(message);
					}
					return null;
				}
			}
		} catch (IOException e) {
			throw new JGitInternalException(
					MessageFormat.format(
									JGitText.get().exceptionCaughtDuringExecutionOfRevertCommand,
							e), e);
		}
		return newHead;
	}