return null == topologicallySortedProjects
                ? Collections.emptyList()
                : Collections.unmodifiableList(topologicallySortedProjects);
    }

    public DependencyResolutionResult getDependencyResolutionResult() {
        return dependencyResolutionResult;
    }

    public MavenExecutionResult setDependencyResolutionResult(DependencyResolutionResult dependencyResolutionResult) {