.map(MavenProject::getVersion)
                .collect(Collectors.collectingAndThen(Collectors.toList(), Collections::unmodifiableList));
    }

    @Override
    public Model findModel(Artifact artifact) {
        MavenProject project = getProject(artifact);
        return project == null ? null : project.getModel().getDelegate();
    }

    //
    // Implementation
    //