}

    @Override
    public List<Toolchain> getToolchains(Session session, String type, Map<String, String> requirements)
            throws ToolchainManagerException {
        MavenSession s = InternalMavenSession.from(session).getMavenSession();
        List<org.apache.maven.toolchain.Toolchain> toolchains =
                toolchainManagerPrivate.getToolchains(s, type, requirements);

                return toolchains.get(0);
            }
        }

        return null;
    }

    @Override
    public List<Toolchain> getToolchains(MavenSession session, String type, Map<String, String> requirements) {
        List<ToolchainModel> models = session.getRequest().getToolchains().get(type);

        return selectToolchains(models, type, requirements);
    }

    private List<Toolchain> selectToolchains(

        super(target);
    }

    @Override
    protected Collection<AvailableToolChains.ToolChainCandidate> getPartialVersions() {
        List<AvailableToolChains.ToolChainCandidate> toolChains = AvailableToolChains.getToolChains();
        Map<AvailableToolChains.ToolFamily, AvailableToolChains.ToolChainCandidate> availableByFamily = Maps.newEnumMap(AvailableToolChains.ToolFamily.class);

        } else {
            List<ToolchainModel> availableToolchains =
                    org.apache.maven.toolchain.model.ToolchainModel.toolchainModelToApiV4(
                            session.getRequest().getToolchains().get(type));

            if (availableToolchains != null) {
                for (ToolchainModel toolchainModel : availableToolchains) {
                    org.apache.maven.toolchain.model.ToolchainModel tm =

     * @param requirements the requirements, may be {@code null}
     * @return the matching toolchains, never {@code null}
     * @since 3.3.0
     */
    List<Toolchain> getToolchains(MavenSession session, String type, Map<String, String> requirements);