public Ref call()

in org.eclipse.jgit/src/org/eclipse/jgit/api/CreateBranchCommand.java [87:237]
128 lines of code
30 McCabe index (conditional complexity)

	public Ref call() throws GitAPIException, RefAlreadyExistsException,
			RefNotFoundException, InvalidRefNameException {
		checkCallable();
		processOptions();
		try (RevWalk revWalk = new RevWalk(repo)) {
			Ref refToCheck = repo.findRef(name);
			boolean exists = refToCheck != null
					&& refToCheck.getName().startsWith(R_HEADS);
			if (!force && exists)
				throw new RefAlreadyExistsException(MessageFormat.format(
						JGitText.get().refAlreadyExists1, name));

			ObjectId startAt = getStartPointObjectId();
			String startPointFullName = null;
			if (startPoint != null) {
				Ref baseRef = repo.findRef(startPoint);
				if (baseRef != null)
					startPointFullName = baseRef.getName();
			}

			// determine whether we are based on a commit,
			// a branch, or a tag and compose the reflog message
			String refLogMessage;
			String baseBranch = ""; //$NON-NLS-1$
			if (startPointFullName == null) {
				String baseCommit;
				if (startCommit != null)
					baseCommit = startCommit.getShortMessage();
				else {
					RevCommit commit = revWalk.parseCommit(repo
							.resolve(getStartPointOrHead()));
					baseCommit = commit.getShortMessage();
				}
				if (exists)
					refLogMessage = "branch: Reset start-point to commit " //$NON-NLS-1$
							+ baseCommit;
				else
					refLogMessage = "branch: Created from commit " + baseCommit; //$NON-NLS-1$

			} else if (startPointFullName.startsWith(R_HEADS)
					|| startPointFullName.startsWith(Constants.R_REMOTES)) {
				baseBranch = startPointFullName;
				if (exists)
					refLogMessage = "branch: Reset start-point to branch " //$NON-NLS-1$
							+ startPointFullName; // TODO
				else
					refLogMessage = "branch: Created from branch " + baseBranch; //$NON-NLS-1$
			} else {
				startAt = revWalk.peel(revWalk.parseAny(startAt));
				if (exists)
					refLogMessage = "branch: Reset start-point to tag " //$NON-NLS-1$
							+ startPointFullName;
				else
					refLogMessage = "branch: Created from tag " //$NON-NLS-1$
							+ startPointFullName;
			}

			RefUpdate updateRef = repo.updateRef(R_HEADS + name);
			updateRef.setNewObjectId(startAt);
			updateRef.setRefLogMessage(refLogMessage, false);
			Result updateResult;
			if (exists && force)
				updateResult = updateRef.forceUpdate();
			else
				updateResult = updateRef.update();

			setCallable(false);

			boolean ok = false;
			switch (updateResult) {
			case NEW:
				ok = !exists;
				break;
			case NO_CHANGE:
			case FAST_FORWARD:
			case FORCED:
				ok = exists;
				break;
			default:
				break;
			}

			if (!ok)
				throw new JGitInternalException(MessageFormat.format(JGitText
						.get().createBranchUnexpectedResult, updateResult
						.name()));

			Ref result = repo.findRef(name);
			if (result == null)
				throw new JGitInternalException(
						JGitText.get().createBranchFailedUnknownReason);

			if (baseBranch.length() == 0) {
				return result;
			}

			// if we are based on another branch, see
			// if we need to configure upstream configuration: first check
			// whether the setting was done explicitly
			boolean doConfigure;
			if (upstreamMode == SetupUpstreamMode.SET_UPSTREAM
					|| upstreamMode == SetupUpstreamMode.TRACK)
				// explicitly set to configure
				doConfigure = true;
			else if (upstreamMode == SetupUpstreamMode.NOTRACK)
				// explicitly set to not configure
				doConfigure = false;
			else {
				// if there was no explicit setting, check the configuration
				String autosetupflag = repo.getConfig().getString(
						ConfigConstants.CONFIG_BRANCH_SECTION, null,
						ConfigConstants.CONFIG_KEY_AUTOSETUPMERGE);
				if ("false".equals(autosetupflag)) { //$NON-NLS-1$
					doConfigure = false;
				} else if ("always".equals(autosetupflag)) { //$NON-NLS-1$
					doConfigure = true;
				} else {
					// in this case, the default is to configure
					// only in case the base branch was a remote branch
					doConfigure = baseBranch.startsWith(Constants.R_REMOTES);
				}
			}

			if (doConfigure) {
				StoredConfig config = repo.getConfig();

				String remoteName = repo.getRemoteName(baseBranch);
				if (remoteName != null) {
					String branchName = repo
							.shortenRemoteBranchName(baseBranch);
					config
							.setString(ConfigConstants.CONFIG_BRANCH_SECTION,
									name, ConfigConstants.CONFIG_KEY_REMOTE,
									remoteName);
					config.setString(ConfigConstants.CONFIG_BRANCH_SECTION,
							name, ConfigConstants.CONFIG_KEY_MERGE,
							Constants.R_HEADS + branchName);
				} else {
					// set "." as remote
					config.setString(ConfigConstants.CONFIG_BRANCH_SECTION,
							name, ConfigConstants.CONFIG_KEY_REMOTE, "."); //$NON-NLS-1$
					config.setString(ConfigConstants.CONFIG_BRANCH_SECTION,
							name, ConfigConstants.CONFIG_KEY_MERGE, baseBranch);
				}
				config.save();
			}
			return result;
		} catch (IOException ioe) {
			throw new JGitInternalException(ioe.getMessage(), ioe);
		}
	}