@Override
    public StatusOutputStream<Void> write(final Path file, final TransferStatus status, final ConnectionCallback callback) throws BackgroundException {
        try {
            final java.nio.file.Path p = session.toPath(file);
            final Set<OpenOption> options = new HashSet<>();
            options.add(StandardOpenOption.WRITE);
            if(status.isAppend()) {
                if(!status.isExists()) {
                    options.add(StandardOpenOption.CREATE);
                }
            }
            else {
                if(status.isExists()) {
                    if(file.isSymbolicLink()) {
                        Files.delete(p);
                        options.add(StandardOpenOption.CREATE);
                    }
                    else {
                        options.add(StandardOpenOption.TRUNCATE_EXISTING);
                    }
                }
                else {
                    options.add(StandardOpenOption.CREATE_NEW);
                }
            }
            final FileChannel channel = FileChannel.open(session.toPath(file), options.stream().toArray(OpenOption[]::new));
            channel.position(status.getOffset());
            return new VoidStatusOutputStream(Channels.newOutputStream(channel));
        }
        catch(IOException e) {
            throw new LocalExceptionMappingService().map("Upload {0} failed", e, file);
        }
    }
@Test
    public void testWriteSymlink() throws Exception {
        final LocalSession session = new LocalSession(new Host(new LocalProtocol(), new LocalProtocol().getDefaultHostname()));
        if(session.isPosixFilesystem()) {
            session.open(new DisabledProxyFinder(), new DisabledHostKeyCallback(), new DisabledLoginCallback(), new DisabledCancelCallback());
            session.login(new DisabledLoginCallback(), new DisabledCancelCallback());
            final Path workdir = new LocalHomeFinderFeature().find();
            final Path target = new Path(workdir, UUID.randomUUID().toString(), EnumSet.of(Path.Type.file));
            new LocalTouchFeature(session).touch(target, new TransferStatus());
            assertTrue(new LocalFindFeature(session).find(target));
            final String name = UUID.randomUUID().toString();
            final Path symlink = new Path(workdir, name, EnumSet.of(Path.Type.file, AbstractPath.Type.symboliclink));
            new LocalSymlinkFeature(session).symlink(symlink, target.getName());
            assertTrue(new LocalFindFeature(session).find(symlink));
            final TransferStatus status = new TransferStatus();
            final int length = 1048576;
            final byte[] content = RandomUtils.nextBytes(length);
            status.setLength(content.length);
            status.setExists(true);
            final OutputStream out = new LocalWriteFeature(session).write(symlink, status, new DisabledConnectionCallback());
            new StreamCopier(status, status).transfer(new ByteArrayInputStream(content), out);
            out.close();
            {
                final ByteArrayOutputStream buffer = new ByteArrayOutputStream(content.length);
                final InputStream in = new LocalReadFeature(session).read(symlink, new TransferStatus().withLength(content.length), new DisabledConnectionCallback());
                new StreamCopier(status, status).transfer(in, buffer);
                assertArrayEquals(content, buffer.toByteArray());
            }
            {
                final byte[] buffer = new byte[0];
                final InputStream in = new LocalReadFeature(session).read(target, new TransferStatus(), new DisabledConnectionCallback());
                IOUtils.readFully(in, buffer);
                in.close();
                assertArrayEquals(new byte[0], buffer);
            }
            final AttributedList<Path> list = new LocalListService(session).list(workdir, new DisabledListProgressListener());
            assertTrue(list.contains(new Path(workdir, name, EnumSet.of(Path.Type.file))));
            assertFalse(list.contains(symlink));
            new LocalDeleteFeature(session).delete(Arrays.asList(target, symlink), new DisabledLoginCallback(), new Delete.DisabledCallback());
        }
    }