*/
    public Set<MavenProject> getUnfinishedProjects() {
        Set<MavenProject> unfinished = new HashSet<>(projectBuilds.getProjects());
        unfinished.removeAll(finishedProjects);
        return unfinished;
    }

    /**
     * @return set of projects that have been successfully processed by the build.
     */
    protected Set<MavenProject> getFinishedProjects() {

            throw uoe();
        }

        @Override
        public boolean addAll(Collection<? extends E> c) {
            throw uoe();
        }

        @Override
        public boolean removeAll(Collection<?> c) {
            throw uoe();
        }

        @Override
        public boolean retainAll(Collection<?> c) {
            throw uoe();
        }

        @Override

            throw uoe();
        }

        @Override
        public boolean addAll(Collection<? extends E> c) {
            throw uoe();
        }

        @Override
        public boolean removeAll(Collection<?> c) {
            throw uoe();
        }

        @Override
        public boolean retainAll(Collection<?> c) {
            throw uoe();
        }

        @Override

            excludedProjects.addAll(
                    projectSelector.getOptionalProjectsBySelectors(request, allProjects, optionalSelectors));

            result = new ArrayList<>(projects);
            result.removeAll(excludedProjects);

            if (result.isEmpty()) {
                boolean isPlural = excludedProjects.size() > 1;
                String message = String.format(