roots.add(toSpec(sourceTree))
        }
    }

    private
    fun fromSpec(spec: FileTreeSpec): FileTreeInternal = when (spec) {
        is AdaptedFileTreeSpec -> fileCollectionFactory.treeOf(spec.tree)
        is FilteredFileTreeSpec -> spec.tree.matching(spec.patterns)
        is FilteredMinimalFileTreeSpec -> fromSpec(spec.tree).matching(spec.patterns)
        is WrappedFileCollectionTreeSpec -> spec.collection.asFileTree

        this.projectLayout = projectLayout;
    }

    private static abstract class IncrementalCompilationCustomizer extends CompilationCustomizer {
        static IncrementalCompilationCustomizer fromSpec(GroovyJavaJointCompileSpec spec, ApiCompilerResult result) {
            if (spec.incrementalCompilationEnabled()) {

def main(args):
    """Generates a signed JSON Web Token from local private key."""
    with open(args.key) as f:
        pem_data = f.read()
    f.closed

    pem_data_encode = pem_data.encode("utf-8")
    key = jwk.JWK.from_pem(pem_data_encode)

    if args.jwks:
        with open(args.jwks, "w+") as fout:
            fout.write("{ \"keys\":[ ")
            fout.write(key.export(private_key=False))
            fout.write("]}")