protected String getDefaultAuthenticationContextClass() {
        return StringUtils.defaultIfBlank(
            casProperties.getAuthn().getSamlIdp().getCore().getContext().getDefaultAuthenticationContextClass(),
            AuthnContext.PPT_AUTHN_CTX);
    }
This is {@link SamlProfileAuthnContextClassRefBuilder}.

@author Misagh Moayyed
@since 5.0.0
support/cas-server-support-saml-idp-web/src/main/java/org/apereo/cas/support/saml/web/idp/profile/builders/authn/SamlProfileAuthnContextClassRefBuilder.java