}

    private static class MappedToolchainsSource implements org.apache.maven.building.Source {
        private final Source source;

        MappedToolchainsSource(Source source) {
            this.source = source;
        }

        @Override
        public InputStream getInputStream() throws IOException {
            return source.openStream();
        }

        @Override
        public String getLocation() {

        List<BuilderProblem> problems = new ArrayList<>();

        Source globalSource = request.getGlobalToolchainsSource().orElse(null);
        PersistedToolchains global = readToolchains(globalSource, request, problems);

        Source userSource = request.getUserToolchainsSource().orElse(null);
        PersistedToolchains user = readToolchains(userSource, request, problems);