private boolean doCheckout()

in org.eclipse.jgit/src/org/eclipse/jgit/dircache/DirCacheCheckout.java [494:627]
111 lines of code
25 McCabe index (conditional complexity)

	private boolean doCheckout() throws CorruptObjectException, IOException,
			MissingObjectException, IncorrectObjectTypeException,
			CheckoutConflictException, IndexWriteException, CanceledException {
		toBeDeleted.clear();
		options = repo.getConfig()
				.get(WorkingTreeOptions.KEY);
		try (ObjectReader objectReader = repo.getObjectDatabase().newReader()) {
			if (headCommitTree != null)
				preScanTwoTrees();
			else
				prescanOneTree();

			if (!conflicts.isEmpty()) {
				if (failOnConflict) {
					throw new CheckoutConflictException(conflicts.toArray(new String[0]));
				}
				cleanUpConflicts();
			}

			// update our index
			builder.finish();

			// init progress reporting
			int numTotal = removed.size() + updated.size() + conflicts.size();
			monitor.beginTask(JGitText.get().checkingOutFiles, numTotal);

			performingCheckout = true;
			File file = null;
			String last = null;
			// when deleting files process them in the opposite order as they have
			// been reported. This ensures the files are deleted before we delete
			// their parent folders
			IntList nonDeleted = new IntList();
			for (int i = removed.size() - 1; i >= 0; i--) {
				String r = removed.get(i);
				file = new File(repo.getWorkTree(), r);
				if (!file.delete() && repo.getFS().exists(file)) {
					// The list of stuff to delete comes from the index
					// which will only contain a directory if it is
					// a submodule, in which case we shall not attempt
					// to delete it. A submodule is not empty, so it
					// is safe to check this after a failed delete.
					if (!repo.getFS().isDirectory(file)) {
						nonDeleted.add(i);
						toBeDeleted.add(r);
					}
				} else {
					if (last != null && !isSamePrefix(r, last))
						removeEmptyParents(new File(repo.getWorkTree(), last));
					last = r;
				}
				monitor.update(1);
				if (monitor.isCancelled()) {
					throw new CanceledException(MessageFormat.format(
							JGitText.get().operationCanceled,
							JGitText.get().checkingOutFiles));
				}
			}
			if (file != null) {
				removeEmptyParents(file);
			}
			removed = filterOut(removed, nonDeleted);
			nonDeleted = null;
			Iterator<Map.Entry<String, CheckoutMetadata>> toUpdate = updated
					.entrySet().iterator();
			Map.Entry<String, CheckoutMetadata> e = null;
			try {
				while (toUpdate.hasNext()) {
					e = toUpdate.next();
					String path = e.getKey();
					CheckoutMetadata meta = e.getValue();
					DirCacheEntry entry = dc.getEntry(path);
					if (FileMode.GITLINK.equals(entry.getRawMode())) {
						checkoutGitlink(path, entry);
					} else {
						checkoutEntry(repo, entry, objectReader, false, meta,
								options);
					}
					e = null;

					monitor.update(1);
					if (monitor.isCancelled()) {
						throw new CanceledException(MessageFormat.format(
								JGitText.get().operationCanceled,
								JGitText.get().checkingOutFiles));
					}
				}
			} catch (Exception ex) {
				// We didn't actually modify the current entry nor any that
				// might follow.
				if (e != null) {
					toUpdate.remove();
				}
				while (toUpdate.hasNext()) {
					e = toUpdate.next();
					toUpdate.remove();
				}
				throw ex;
			}
			for (String conflict : conflicts) {
				// the conflicts are likely to have multiple entries in the
				// dircache, we only want to check out the one for the "theirs"
				// tree
				int entryIdx = dc.findEntry(conflict);
				if (entryIdx >= 0) {
					while (entryIdx < dc.getEntryCount()) {
						DirCacheEntry entry = dc.getEntry(entryIdx);
						if (!entry.getPathString().equals(conflict)) {
							break;
						}
						if (entry.getStage() == DirCacheEntry.STAGE_3) {
							checkoutEntry(repo, entry, objectReader, false,
									null, options);
							break;
						}
						++entryIdx;
					}
				}

				monitor.update(1);
				if (monitor.isCancelled()) {
					throw new CanceledException(MessageFormat.format(
							JGitText.get().operationCanceled,
							JGitText.get().checkingOutFiles));
				}
			}
			monitor.endTask();

			// commit the index builder - a new index is persisted
			if (!builder.commit())
				throw new IndexWriteException();
		}
		return toBeDeleted.isEmpty();
	}