}

    @Override
    public Optional<Project> getExecutionProject(Project project) {
        // Session keep tracks of the Project per project id,
        // so we cannot use session.getProject(p) for forked projects
        // which are temporary clones
        return Optional.ofNullable(getMavenProject(project).getExecutionProject())
                .map(p -> new DefaultProject(session, p));
    }

        if (project != null) {
            File file = findArtifact(project, artifact, true);
            if (file == null && project != project.getExecutionProject()) {
                file = findArtifact(project.getExecutionProject(), artifact, true);
            }
            return file;
        }

        // No project, but most certainly a dependency which has been built previously

     * @param value the value or {@code null} to unset the property
     */
    void setProperty(@Nonnull Project project, @Nonnull String key, @Nullable String value);

    @Nonnull
    Optional<Project> getExecutionProject(@Nonnull Project project);