String result;
        Path src = sourcePathProvider.get();
        if (src == null) {
            Files.deleteIfExists(target);
            result = null;
        } else if (!Files.exists(src)) {
            Files.deleteIfExists(target);
            result = "";
        } else {
            String current = sha1(src);
            String existing = sourceState.get();

            mavenProjectHelper.attachArtifact(mavenProject, "java-source", artifactFile);
            assertEquals(1, mavenProject.getAttachedArtifacts().size());
        } finally {
            Files.deleteIfExists(artifactFile.toPath());
        }
    }

    @Override
    public void removeResumptionData(MavenProject rootProject) {
        Path resumeProperties = Paths.get(rootProject.getBuild().getDirectory(), RESUME_PROPERTIES_FILENAME);
        try {
            Files.deleteIfExists(resumeProperties);
        } catch (IOException e) {
            LOGGER.warn("Could not delete {} file. ", RESUME_PROPERTIES_FILENAME, e);
        }
    }

                    return Optional.of(Files.readAllBytes(tempPath));
                }
                return Optional.empty();
            } finally {
                if (tempPath != null) {
                    Files.deleteIfExists(tempPath);
                }
            }
        } catch (IOException e) {
            throw new UncheckedIOException(e);
        }
    }

    @Override

                    return Optional.of(Files.readAllBytes(tempPath));
                }
                return Optional.empty();
            } finally {
                if (tempPath != null) {
                    Files.deleteIfExists(tempPath);
                }
            }
        } catch (IOException e) {
            throw new UncheckedIOException(e);
        }
    }

    @Override