Artifact createPluginArtifact(String groupId, String artifactId, VersionRange versionRange);

    Artifact createProjectArtifact(String groupId, String artifactId, String version, String scope);

    Artifact createExtensionArtifact(String groupId, String artifactId, VersionRange versionRange);

        return createArtifact(groupId, artifactId, version, scope, "pom");
    }

    @Override
    public Artifact createExtensionArtifact(String groupId, String artifactId, VersionRange versionRange) {
        return createArtifact(groupId, artifactId, versionRange, "jar", null, Artifact.SCOPE_RUNTIME, null);
    }

    private Artifact createArtifact(